Cold atom interferometer cooling laser power stabilizing system and method
阅读说明：本技术 一种冷原子干涉仪冷却激光功率稳定系统及方法 (Cold atom interferometer cooling laser power stabilizing system and method ) 是由 陈福胜 刘康琦 郭强 毛海岑 姚辉彬 王斌 周嘉鹏 陈新文 宋新明 栾广建 高俊 于 2020-06-08 设计创作，主要内容包括：本发明涉及一种冷原子干涉仪冷却激光功率稳定系统及方法,包括通过光路依次连接的声光调制器、激光耦合器、激光分束器,还包括光功率反馈控制单元,所述光功率反馈控制单元的输入端连接所述激光分束器、其输出端连接所述声光调制器；所述声光调制器通过控制信号对输入激光进行调制,以控制激光输出功率；所述激光耦合器实现激光的耦合；所述激光分束器发出两束冷原子干涉仪的冷却激光束对和监测激光束,两束所述冷却激光束对和所述监测激光束的功率相同；所述光功率反馈控制单元检测所述监测激光束的激光实时输出功率值,并输出驱动所述声光调制器的控制信号。本发明实现了冷却激光的功率稳定闭环控制,激光功率的长期稳定性高,可达0.2％/24h。(The invention relates to a system and a method for stabilizing cooling laser power of a cold atom interferometer, which comprises an acousto-optic modulator, a laser coupler, a laser beam splitter and a light power feedback control unit, wherein the acousto-optic modulator, the laser coupler and the laser beam splitter are sequentially connected through a light path; the acousto-optic modulator modulates the input laser through a control signal so as to control the output power of the laser; the laser coupler realizes the coupling of laser; the laser beam splitter emits two cooling laser beam pairs and monitoring laser beams of the cold atom interferometer, and the power of the two cooling laser beam pairs is the same as that of the monitoring laser beams; and the optical power feedback control unit detects the laser real-time output power value of the monitoring laser beam and outputs a control signal for driving the acousto-optic modulator. The invention realizes the power stable closed-loop control of the cooling laser, and the long-term stability of the laser power is high and can reach 0.2%/24 h.)
1. A cooling laser power stabilizing system of a cold atom interferometer is characterized by comprising an acousto-optic modulator (1), a laser coupler (2), a laser beam splitter (3) and an optical power feedback control unit (4), wherein the acousto-optic modulator (1), the laser coupler (2) and the laser beam splitter (3) are sequentially connected through an optical path, the input end of the optical power feedback control unit (4) is connected with the laser beam splitter (3), and the output end of the optical power feedback control unit is connected with the acousto-optic modulator (1);
the acousto-optic modulator (1) modulates input laser through a control signal so as to control the output power of the laser;
the laser coupler (2) realizes the coupling of laser;
the laser beam splitter (3) emits two cooling laser beam pairs and monitoring laser beams of the cold atom interferometer, and the power of the two cooling laser beam pairs is the same as that of the monitoring laser beams;
and the optical power feedback control unit (4) detects the laser real-time output power value of the monitoring laser beam and outputs a control signal for driving the acousto-optic modulator (1).
2. The system for stabilizing laser power of cold atom interferometer cooling according to claim 1, wherein the optical power feedback control unit (4) comprises an optical power monitoring module (41), a controller (42), a direct frequency synthesizer (43) and a power amplifier (44), the input of the optical power monitoring module (41) is optically connected with the output of the laser beam splitter (3), the controller (42) is respectively connected with the optical power monitoring module (41) and the direct frequency synthesizer (43) in communication, the output of the direct frequency synthesizer (43) is connected with the power amplifier (44) by signal, the output of the power amplifier (44) is connected with the acousto-optic modulator (1) by signal,
the optical power monitoring module (41) converts an optical signal of the monitoring laser beam into an electric signal to measure a real-time laser output power value;
the controller (42) calculates the laser real-time output power value, a prestored laser power threshold value and a prestored monitoring power reference value, and then outputs a control signal with an adjusted amplitude value;
the direct frequency synthesizer (43) converts the control signal into a control signal with a specific frequency and outputs the control signal;
the power amplifier (44) amplifies the control signal;
the amplified control signal drives the acousto-optic modulator (1) to modulate laser so as to control the output power of the laser.
3. The system for stabilizing the cooling laser power of the cold atom interferometer according to claim 2, wherein the optical power monitoring module (41) comprises a photoelectric detector (411), a signal conditioning module (412) and a signal acquisition and conversion module (413) which are connected in sequence through signals,
the photoelectric detector (411) collects the optical signal of the monitoring laser beam and converts the optical signal into an electric signal corresponding to the real-time laser output power;
the signal conditioning module (412) isolates, converts, amplifies and outputs the electric signal to the signal acquisition and conversion module (413);
the signal acquisition and conversion module (413) acquires the electric signal, performs analog/digital conversion on the electric signal and outputs the electric signal to the controller (42).
4. A cold atom interferometer cooled laser power stabilization system according to claim 2, characterized in that the direct frequency synthesizer (43) and the power amplifier (44) and the acousto-optic modulator (1) are connected by coaxial cables respectively.
5. The system for cooling laser power stabilization of a cold atom interferometer according to claim 2, wherein the controller (42) is in communication connection with an upper computer (5), and parameters of the controller (42) are set by the upper computer (5).
6. The system for stabilizing the cooling laser power of the cold atom interferometer of claim 1, wherein the output power of the cooling laser beam pair is consistent with the output power of the monitoring laser beam when the acousto-optic modulator (1) modulates the laser.
7. The system for stabilizing the cooling laser power of the cold atom interferometer according to any one of claim 1, further comprising a cold atom interferometer master control system, wherein the cold atom interferometer master control system controls the on/off of the optical power feedback control unit (4) by sending an interrupt signal: when the interrupt signal is at a high level, the optical power feedback control unit (4) is switched off; and when the interrupt signal is at a low level, the optical power feedback control unit (4) is started.
8. Cold atom interferometer cooling laser power stabilization method based on the system of any one of claims 1-7, characterized by comprising the following steps:
s1, presetting a preset power reference value P1 when the laser power stabilizing function is closed, and presetting a monitoring power reference value P2 and a laser power threshold PT when the laser power stabilizing function is opened;
s2, judging whether to start the laser power stabilizing function;
s3, if the laser power stabilizing function is not started, adjusting the amplitude of the laser control signal by adopting the preset power reference value P1;
s4, if the laser power stabilizing function is started, monitoring the real-time laser output power P, and comparing the real-time laser output power P with the laser power threshold PT: if the laser real-time output power P is larger than the laser power threshold PT, calculating an adjusting power value P 'by the laser real-time output power P and the monitoring power reference value P2 through a PID algorithm, and adjusting the amplitude of the laser control signal by using the adjusting power value P'; and if the real-time laser output power P is not greater than the laser power threshold PT, adjusting the amplitude of the laser control signal by using the preset power reference value P1, and sending alarm information.
9. The method of claim 8, wherein the laser power is controlled by adjusting an amplitude of the laser control signal.
Technical Field
The invention relates to the field of laser power control, in particular to a system and a method for stabilizing cooling laser power of a cold atom interferometer.
Background
With the development of cold atom technology, cold atom interferometers have been used to measure physical quantities such as physical constants, gravitational acceleration, gravitational gradient, rotation, and the like with high accuracy.
The working process of the cold atom interferometer can be divided into four stages: the method comprises a cold atom trapping stage, a cold atom casting stage, a cold atom interference stage and an interference signal detection stage. According to the working requirement of the cold atom interferometer, cooling laser beams are needed to be used for cold atom trapping and projection, wherein the frequency and the power of the cooling laser beams in the trapping stage can influence the position and the atom number of the trapped cold atom groups, the frequency of the cooling laser beams in the projection stage is changed, the cold atom groups move under the action of the cooling laser beams, the final speed of the cold atom groups depends on the variation of the frequency of the cooling laser beams, the speed direction depends on the power of the cooling laser beams, and therefore the frequency and the power of the laser beams can be required to be completely and independently adjusted between each pair of cooling laser beams of the cold atom interferometer.
Most of the existing cold atom interferometers adopt three pairs of cooling laser beams to imprison and cast cold atom groups. The three pairs of cooling laser beams are generated by the same laser, the laser generated by the laser is split by using a polarization beam splitter prism and a wave plate in a constructed light path, and the three split laser beams generate diffraction laser by using three acousto-optic modulators respectively; the diffraction laser beam output by each acousto-optic modulator is divided into 1: the laser beam splitter of 1 generates three pairs of laser beams as cooling laser beam pairs of the cold atom interferometer. The independent control of the three acousto-optic modulators can ensure the complete independent adjustment of the three pairs of laser beams, but the defect of unstable laser power is obvious: firstly, the power of laser output laser and polarization state's unstability, laser power after the beam splitting can be unstable, secondly because the difference of the characteristic of acousto-optic modulator itself, the relative incident laser power of diffraction laser power of its outgoing has certain loss and unstability, thirdly, after acousto-optic modulator's outgoing laser got into the beam splitter through the mode of coupling, the mechanical characteristic of coupling structure can lead to coupling efficiency to change, and then the power that the cooling laser beam that leads to the beam splitting output right also can change. The unstable power of the cooling laser beam can cause the unstable cold atom group trapping position and moving speed direction when the cold atom interferometer works, and influence is brought to the measurement result of the cold atom interferometer.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a system and a method for stabilizing the cooling laser power of a cold atom interferometer, and solves the problem of unstable cooling laser power of the cold atom interferometer.
The technical scheme for solving the technical problems is as follows:
on one hand, the invention provides a cooling laser power stabilizing system of a cold atom interferometer, which comprises an acousto-optic modulator, a laser coupler, a laser beam splitter and an optical power feedback control unit, wherein the acousto-optic modulator, the laser coupler and the laser beam splitter are sequentially connected through an optical path;
the acousto-optic modulator modulates the input laser through a control signal so as to control the output power of the laser;
the laser coupler realizes the coupling of laser;
the laser beam splitter emits two cooling laser beam pairs and monitoring laser beams of the cold atom interferometer, and the power of the two cooling laser beam pairs is the same as that of the monitoring laser beams;
and the optical power feedback control unit detects the laser real-time output power value of the monitoring laser beam and outputs a control signal for driving the acousto-optic modulator.
Further, the optical power feedback control unit comprises an optical power monitoring module, a controller, a direct frequency synthesizer and a power amplifier, wherein the input of the optical power monitoring module is connected with the output of the laser beam splitter through an optical path, the controller is respectively in communication connection with the optical power monitoring module and the direct frequency synthesizer, the output of the direct frequency synthesizer is in signal connection with the power amplifier, the output of the power amplifier is in signal connection with the acousto-optic modulator,
the optical power monitoring module converts an optical signal of the monitoring laser beam into an electric signal and measures a real-time laser output power value;
the controller calculates the laser real-time output power value, a prestored laser power threshold value and a prestored monitoring power reference value and outputs a control signal after amplitude adjustment;
the direct frequency synthesizer converts the control signal into a control signal with a specific frequency and outputs the control signal;
the power amplifier amplifies the control signal;
the amplified control signal drives the acousto-optic modulator to modulate the laser so as to control the output power of the laser.
Further, the optical power monitoring module comprises a photoelectric detector, a signal conditioning module and a signal acquisition and conversion module which are sequentially in signal connection,
the photoelectric detector collects the optical signal of the monitoring laser beam and converts the optical signal into an electric signal corresponding to the real-time laser output power;
the signal conditioning module isolates, converts and amplifies the electric signals and outputs the electric signals to the signal acquisition and conversion module;
the signal acquisition and conversion module acquires the electric signal, performs analog/digital conversion on the electric signal and outputs the electric signal to the controller.
Further, the direct frequency synthesizer and the power amplifier, and the power amplifier and the acousto-optic modulator are respectively connected through coaxial cables.
Further, the controller is in communication connection with an upper computer, and parameters of the controller are set through the upper computer.
Further, when the acousto-optic modulator modulates the laser, the output power of the cooling laser beam pair is consistent with the output power change of the monitoring laser beam.
Further, the cooling laser power stabilization system further comprises a cold atom interferometer main control system, wherein the cold atom interferometer main control system controls the on-off of the optical power feedback control unit by sending an interrupt signal: when the interrupt signal is at a high level, the optical power feedback control unit is switched off; and when the interrupt signal is at a low level, the optical power feedback control unit is started.
On the other hand, the invention provides a method for stabilizing the cooling laser power of a cold atom interferometer, which comprises the following steps:
s1, presetting a preset power reference value P1 when the laser power stabilizing function is closed, and presetting a monitoring power reference value P2 and a laser power threshold PT when the laser power stabilizing function is opened;
s2, judging whether to start the laser power stabilizing function;
s3, if the laser power stabilizing function is not started, adjusting the amplitude of the laser control signal by adopting the preset power reference value P1;
s4, if the laser power stabilizing function is started, monitoring the real-time laser output power P, and comparing the real-time laser output power P with the laser power threshold PT: if the laser real-time output power P is larger than the laser power threshold PT, calculating an adjusting power value P 'by the laser real-time output power P and the monitoring power reference value P2 through a PID algorithm, and adjusting the amplitude of the laser control signal by using the adjusting power value P'; and if the real-time laser output power P is not greater than the laser power threshold PT, adjusting the amplitude of the laser control signal by using the preset power reference value P1, and sending alarm information.
Furthermore, the invention controls the laser power by adjusting the amplitude of the laser control signal.
The invention has the beneficial effects that: the laser is modulated by the acousto-optic modulator and then enters the laser coupler to be coupled, the coupled laser forms two cooling laser beam pairs of the cold atom interferometer and monitoring laser through the laser beam splitter, the power of the two cooling laser beams is consistent with that of the monitoring laser beam, and the power of the two cooling laser beams can be monitored by feeding back the power of the monitoring laser beam. The optical power feedback control system is connected with the acousto-optic modulator and the laser beam splitter, the monitoring laser is detected by the optical power feedback control system and generates a control signal to drive and adjust the acousto-optic modulator, the acousto-optic modulator modulates the laser, and then the power of the output laser is controlled, so that the stable closed-loop control of the power of the cooling laser is realized, the long-term stability of the laser power is high, and the stable closed-loop control can reach 0.2%/24 h.
Drawings
FIG. 1 is a block diagram of a system for cooling laser power stabilization for a cold atom interferometer according to an embodiment of the present invention;
FIG. 2 is a block diagram of an optical power monitoring module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a stage in operation of the cold atom interferometer of the present invention;
fig. 4 is a flow chart of power stabilization adjustment according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises an acousto-optic modulator, a laser coupler, a laser beam splitter, a laser power feedback control unit, a laser power monitoring module, a photoelectric detector, a signal conditioning module, a signal collecting and converting module, a photoelectric detector, a
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
On one hand, the invention provides a cooling laser power stabilization system of a cold atom interferometer as shown in fig. 1, which comprises an acousto-optic modulator 1, a laser coupler 2, a laser beam splitter 3 and an optical power feedback control unit 4, wherein the acousto-optic modulator 1, the laser coupler 2, the laser beam splitter 3 and the optical power feedback control unit 4 are sequentially connected through an optical path, the input end of the optical power feedback control unit 4 is connected with the laser beam splitter 3, and the output end of the optical power feedback control unit is connected with the acousto-optic modulator 1;
the acousto-optic modulator 1 modulates input laser through a control signal to control the output power of the laser;
the laser coupler 2 realizes the coupling of laser;
the laser beam splitter 3 emits two cooling laser beam pairs and monitoring laser beams of the cold atom interferometer, and the power of the two cooling laser beam pairs is the same as that of the monitoring laser beams;
the optical power feedback control unit 4 detects the laser real-time output power value of the monitoring laser beam and outputs a control signal for driving the acousto-optic modulator 1.
As shown in fig. 1, the optical power feedback control unit 4 includes an optical power monitoring module 41, a controller 42, a direct frequency synthesizer 43, and a power amplifier 44, where an input of the optical power monitoring module 41 is connected to an output of the laser beam splitter 3 through an optical path, and the controller 42 is in communication connection with the optical power monitoring module 41 and the direct frequency synthesizer 43 through digital interfaces, respectively, so that the anti-interference capability of the system can be effectively improved through the digital interfaces, and the stability of the system is provided. The output of the direct frequency synthesizer 43 is signal-connected to the power amplifier 44, and the output of the power amplifier 44 is signal-connected to the acousto-optic modulator 1.
The optical power monitoring module 41 converts the optical signal of the monitoring laser beam into an electrical signal to measure the real-time laser output power value, and transmits the real-time laser output power value to the controller 42.
And the controller 42 calculates the laser real-time output power value, a prestored laser power threshold value and a prestored monitoring power reference value, and outputs a control signal with an adjusted amplitude value.
Specifically, the controller 42 first compares the laser real-time output power with a pre-stored laser power threshold: if the laser real-time output power is greater than the laser power threshold, calculating an adjusting power value by the laser real-time output power and the monitoring power reference value through a PID algorithm, and adjusting the amplitude of a laser control signal output by the controller 42 by using the adjusting power value; if the real-time laser output power is not greater than the laser power threshold, another preset power reference value is used to adjust the amplitude of the laser control signal, and meanwhile, an alarm flag bit of the controller 42 is set and alarm information is sent. If the real-time laser output power is not greater than the laser power threshold, which usually indicates that cooling laser is blocked or the total input laser power is attenuated, the optical power feedback control unit 4 automatically stops working and gives an alarm to prompt, and after the blocking object is removed or the real-time laser output power is restored to the set threshold, the optical power feedback control unit 4 restores working, so that intelligent feedback control is realized.
The direct frequency synthesizer 43 converts the control signal into a control signal having a specific frequency and outputs the control signal. The direct frequency synthesizer 43 is preset with an output frequency of the control signal, and the control signal amplitude-modulated by the controller 42 is frequency-modulated and sent to the power amplifier 44 in the next step.
The power amplifier 44 amplifies the control signal and transmits the amplified control signal to the acousto-optic modulator 1, so as to drive the acousto-optic modulator 1 to modulate laser.
The amplified control signal drives the acousto-optic modulator 1 to modulate laser so as to control the output power of the laser.
As shown in fig. 2, in this embodiment, the optical power monitoring module 41 includes a
The
the
the signal collecting and converting
Further, the direct frequency synthesizer 43 and the power amplifier 44, and the power amplifier 44 and the acousto-optic modulator 1 are connected by coaxial cables, respectively. The adoption of the coaxial cable can effectively improve the anti-interference performance of signals.
Further, the controller 42 is in communication connection with the upper computer 5, and parameters of the controller 42 are set through the upper computer 5. In this embodiment, through the connection between the upper computer 5 and the controller 42, the upper computer 5 may initialize the entire system, set various parameters of the system, such as the output frequency of the direct frequency synthesizer 43, the preset power reference value when the optical power feedback control unit 4 is not turned on, the monitoring power reference value when the optical power feedback control unit 4 is turned on, and the laser power threshold, and upload and store the monitoring data.
In this embodiment, when the acousto-optic modulator 1 modulates the laser, the output power of the cooling laser beam pair is consistent with the output power of the monitoring laser beam. The power values of the cooling laser beam pairs of the two cold atom interferometers can be synchronously controlled by detecting and controlling the power of the monitoring laser beam.
In this embodiment, the cooling laser power stabilization system further includes a cold atom interferometer main control system, and the cold atom interferometer main control system controls the on/off of the optical power feedback control unit 4 by sending an interrupt signal: when the interrupt signal is at a high level, the optical power feedback control unit 4 is turned off; and when the interrupt signal is at a low level, the optical power feedback control unit 4 is turned on.
In more detail, as shown in fig. 3, the cold atom interferometer master control system is communicatively connected to the controller 42 through the upper computer 5. And an interrupt signal generated by the cold atom interferometer master control system is high-level effective, the optical power feedback control unit 4 is closed when the interrupt signal is effective, and the optical power feedback control unit 4 is started when the interrupt signal is ineffective. The generation process of the interrupt signal generated by the cold atom interferometer master control system comprises the following steps: the
On the other hand, based on the cooling laser power stabilizing system of the cold atom interferometer, the invention provides a cooling laser power stabilizing method of the cold atom interferometer, which specifically comprises the following steps:
s1, performing system initialization by the upper computer 5, presetting a preset power reference value P1 when the laser power stabilization function is turned off (i.e., the feedback function of the optical power feedback control unit 4 is turned off), and presetting a monitoring power reference value P2 and a laser power threshold PT when the laser power stabilization function is turned on (i.e., the feedback function of the optical power feedback control unit 4 is turned on), and also presetting an output frequency value of the direct frequency synthesizer 43;
s2, judging whether to start the laser power stabilization function (namely the feedback function of the optical power feedback control unit 4) through an interrupt signal sent by the cold atom interferometer main control system;
s3, if the interrupt signal is high level, which indicates that the laser power stabilization function is not started, adjusting the amplitude of the laser control signal by using the preset power reference value P1 as a reference;
s4, if the interrupt signal is low level, starting the laser power stabilization function, detecting the laser real-time output power P of the monitoring laser beam, and comparing the laser real-time output power P with the laser power threshold PT: if the laser real-time output power P is greater than the laser power threshold PT, taking the laser real-time output power P and the monitoring power reference value P2 as the inputs of PID control in the controller 42, calculating an adjusting power value P 'through a PID algorithm, and adjusting the amplitude of the laser control signal by taking the adjusting power value P' as a reference; if the real-time laser output power P is not greater than the laser power threshold PT, the amplitude of the laser control signal is adjusted by using the preset power reference value P1 as a reference, and meanwhile, an alarm flag bit of the system is set and alarm information is sent out.
And S5, taking the power value reference obtained in the step S3 or the step S4 as the input of the direct frequency synthesizer 43, adjusting the amplitude of the laser control signal by the direct frequency synthesizer 43 through the power value reference, outputting an amplitude-modulated control signal with a fixed output frequency, and amplifying the control signal to drive the acousto-optic modulator 1 to modulate the input laser, so as to achieve the purpose of controlling the power of the laser.
In this embodiment, the laser power is controlled by adjusting the amplitude of the laser control signal.
The process of laser power stabilization adjustment is now further described in conjunction with the flow chart of fig. 4. As shown in fig. 4, the flow of the stable adjustment of the cooling laser power of the cold atom interferometer is as follows: when the system starts to work, step 01 is executed, system initialization is performed, the upper computer 5 performs initialization configuration on the controller 42, configuration parameters include the output frequency of the direct frequency synthesizer 43, a preset power reference value P1, a monitoring power reference value P2 of a monitoring laser beam when the optical power feedback control unit 4 works and a laser power threshold value PT, and the controller 42 programs the direct frequency synthesizer 43 according to the initialization configuration parameters; step 02: judging whether power stabilization of laser is needed or not through an interrupt signal sent by a master control system of the cold atom interferometer, executing step 03 if the power stabilization of the laser is needed, and returning to step 02 if the power stabilization of the laser is not needed; step 03: when the interrupt signal of the cold atom interferometer main control system is not received, executing step 04; step 04: step 05 is executed after the acquisition of the laser real-time output power P of the monitoring laser beam is completed; step 05: judging whether the acquired data is larger than the laser power threshold PT set in the step 01, and executing a step 061 if the acquired data is larger than the laser power threshold PT; step 061: calculating the deviation between the collected data and the monitoring power reference value P2 set in the step 01, and calculating the adjusting power value P' of the direct frequency synthesizer 43 to be adjusted through a PID algorithm; after step 061 is executed, step 07 is executed, the direct frequency synthesizer 43 is programmed with the adjustment power value P' obtained in step 061, a laser control signal with the frequency after amplitude modulation being the output frequency preset in step 01 is output, and the acousto-optic modulator 1 is driven by using the laser control signal to adjust the power value of the laser, so that the laser forms a cooling laser beam pair of two cold atom interferometers through the laser beam splitter 3 and the monitoring laser beam reaches a predetermined value.
When the real-time laser output power P is attenuated or blocked due to external factors, step 04 also completes the acquisition of the real-time laser output power P of the monitoring laser beam, and the value is lower than the laser power threshold PT set in
When the optical power feedback control unit 4 is connected with the cold atom interferometer main control system, the optical power feedback control unit 4 receives an interrupt control signal of the cold atom interferometer main control system;
The laser enters a laser coupler 2 for coupling after passing through an acoustic optical modulator 1, the coupled laser forms two cooling laser beam pairs of a cold atom interferometer and monitoring laser through a laser beam splitter 3, the power of the two cooling laser beams is consistent with that of the monitoring laser beam, and the power of the two cooling laser beams can be monitored by feeding back the power of the monitoring laser beam. The optical power feedback control system is connected with the acousto-optic modulator 1 and the laser beam splitter 3, the monitoring laser is detected by the optical power feedback control system and generates a control signal to drive and adjust the acousto-optic modulator 1, the acousto-optic modulator 1 modulates the laser, and then the power of the output laser is controlled, so that the stable closed-loop control of the power of the cooling laser is realized, the long-term stability of the laser power is high, and the stability can reach 0.2%/24 h.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
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