阅读说明：本技术 一种带同步功能的大功率高速激光波形发生装置 (High-power high-speed laser waveform generating device with synchronization function ) 是由 刘赟 谭小妹 关珮雯 李文涛 刘广柏 于 2020-11-20 设计创作，主要内容包括：本发明要解决的技术问题是：现有半导体激光器的恒流驱动存在分布电容,导致电流难以跟随快速变化地控制电压。为了解决上述技术问题,本发明的技术方案是提供了一种带同步功能的大功率高速激光波形发生装置,其特征在于,包括可以产生任意波形输出的高速恒流驱动模块和由高速恒流驱动模块驱动的激光发生装置。本发明涉及一种可同步、高速、高功率、任意时域波形激光发生装置,属于电子技术、激光领域,尤其属于激光驱动技术领域。(The technical problem to be solved by the invention is as follows: the constant current drive of the existing semiconductor laser has distributed capacitance, so that the current is difficult to control the voltage along with rapid change. In order to solve the technical problems, the technical scheme of the invention is to provide a high-power high-speed laser waveform generating device with a synchronization function, which is characterized by comprising a high-speed constant current driving module capable of generating arbitrary waveform output and a laser generating device driven by the high-speed constant current driving module. The invention relates to a laser generating device capable of synchronously generating high-speed high-power arbitrary time domain waveforms, belongs to the field of electronic technology and laser, and particularly belongs to the technical field of laser driving.)

1. The utility model provides a high-power high-speed laser waveform generator of area synchronization function which characterized in that, includes the high-speed constant current drive module that can produce arbitrary waveform output and by the laser generator of high-speed constant current drive module drive, wherein:

the high-speed constant current driving module comprises a configurable delay input unit (104), a configurable delay output unit (105), a waveform data output unit (115), a high-speed digital-to-analog conversion unit (108) and a closed-loop controllable current output unit; after the trigger input signal (101) is input into the delay input unit (104), the trigger input signal (101) is input into a waveform data output unit (115) on one hand, and after passing through the delay input unit (104), the trigger input signal (101) passes through a configurable delay output unit (105) to generate a trigger output signal (102), wherein the trigger output signal (102) can be used as a trigger input signal (101) of another high-power high-speed laser waveform generating device which is cascaded with the current high-power high-speed laser waveform generating device; after receiving the signal output by the delay input unit (104), the waveform data output unit (115) outputs the waveform data received by the control interface (103) to the high-speed digital-to-analog conversion unit (108), and the high-speed digital-to-analog conversion unit (108) converts the digital signal into an analog signal and outputs the analog signal to the closed-loop controllable current output unit;

the closed-loop controllable current output unit comprises a current control unit (109) forming a closed loop, a current buffer unit (110), a current feedback unit (111) and a constant current generation unit (112), the current control unit (109) receives an analog signal given by the high-speed digital-to-analog conversion unit (108) and a current signal fed back by the current feedback unit (111) and then outputs a control signal to the constant current generation unit (112) through the current buffer unit (110), the current signal output by the constant current generation unit (112) is used for driving the laser generation device to generate a laser signal (114), and the current signal output by the constant current generation unit (112) is fed back to the current control unit (109) through the current feedback unit (111), so that closed-loop control is achieved.

2. The high-power high-speed laser waveform generation device with the synchronization function as claimed in claim 1, wherein the waveform data output unit (115) comprises an address generation unit (106) and a data storage unit (107), and the waveform data transmitted through the control interface (103) is stored in the data storage unit (107); after receiving the signal output by the delay input unit (104), the waveform data output unit (115) reads the data stored in the data storage unit (107) according to the address generated by the address generation unit (106) and outputs the data to the high-speed digital-to-analog conversion unit (108).

3. The high-power high-speed laser waveform generating device with the synchronizing function as claimed in claim 1, wherein the laser generating device adopts an electro-optical conversion unit (113).

4. The high power high speed laser waveform generator with synchronous function as claimed in claim 1, wherein said waveform data includes amplitude, frequency and phase.

5. An application of a high-power high-speed laser waveform generating device with a synchronization function is characterized in that N high-power high-speed laser waveform generating devices as claimed in claim 1 are used in a cascade mode, N is larger than or equal to 2, then the trigger output signal (102) of the nth high-power high-speed laser waveform generating device is used as the trigger input signal (101) of the (N + 1) th high-power high-speed laser waveform generating device, and N is 1, …, (N-1);

n paths of laser signals (114) output by the N high-power high-speed laser waveform generating devices are combined into 1 path of output through a combining unit (116).

Technical Field

The invention relates to a laser generating device capable of synchronously generating high-speed high-power arbitrary time domain waveforms, belongs to the field of electronic technology and laser, and particularly belongs to the technical field of laser driving.

Background

The constant current source is an excitation device having a characteristic that a current does not vary with a load. Semiconductor lasers commonly used in the laser field all belong to current sensitive devices and must be driven by constant current to guarantee reliable operation. The conventional constant current driving for a semiconductor laser is to output after an operational amplifier adopts a MOS tube or a triode for current expansion, and the current is difficult to control the voltage along with rapid change due to the existence of distributed capacitance and difficult elimination, so that the defects limit the application of the laser, such as the addition of perforation and the like.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the constant current drive of the existing semiconductor laser has distributed capacitance, so that the current is difficult to control the voltage along with rapid change.

In order to solve the technical problem, the technical scheme of the invention is to provide a high-power high-speed laser waveform generating device with a synchronization function, which is characterized by comprising a high-speed constant current driving module capable of generating arbitrary waveform output and a laser generating device driven by the high-speed constant current driving module, wherein:

the high-speed constant current driving module comprises a configurable delay input unit, a configurable delay output unit, a waveform data output unit, a high-speed digital-to-analog conversion unit and a closed-loop controllable current output unit; after the trigger input signal is input into the delay input unit, on one hand, a waveform data output unit is input, on the other hand, the trigger input signal passes through the delay input unit and then passes through a configurable delay output unit to generate a trigger output signal, and the trigger output signal can be used as a trigger input signal of another high-power high-speed laser waveform generating device cascaded with the current high-power high-speed laser waveform generating device; after the waveform data output unit receives the signal output by the delay input unit, the waveform data received by the control interface is output to the high-speed digital-to-analog conversion unit, and the high-speed digital-to-analog conversion unit converts the digital signal into an analog signal and outputs the analog signal to the closed-loop controllable current output unit;

the closed-loop controllable current output unit comprises a current control unit, a current buffer unit, a current feedback unit and a constant current generation unit which form a closed loop, the current control unit receives an analog signal given by the high-speed digital-to-analog conversion unit and a current signal fed back by the current feedback unit and then outputs a control signal to the constant current generation unit through the current buffer unit, the current signal output by the constant current generation unit is used for driving the laser generation device to generate a laser signal on one hand, and on the other hand, the constant current generation unit feeds back the output current signal to the current control unit through the current feedback unit, so that closed-loop control is realized.

Preferably, the waveform data output unit includes an address generation unit and a data storage unit, and the waveform data transmitted through the control interface is stored in the data storage unit; and the waveform data output unit reads the data stored in the data storage unit according to the address generated by the address generation unit and outputs the data to the high-speed digital-to-analog conversion unit after receiving the signal output by the delay input unit.

Preferably, the laser generating device adopts an electro-optical conversion group unit.

Preferably, the waveform data includes amplitude, frequency and phase.

Another technical solution of the present invention is to provide an application of a high-power high-speed laser waveform generator with a synchronization function, wherein N high-power high-speed laser waveform generators are used in cascade, N is greater than or equal to 2, then the trigger output signal of the nth high-power high-speed laser waveform generator is used as the trigger input signal of the (N + 1) th high-power high-speed laser waveform generator, N is 1, …, (N-1);

and N paths of laser signals output by the N high-power high-speed laser waveform generating devices are combined into 1 path of output through a combining unit.

Compared with the prior art, the invention has the following advantages:

1) the current buffer unit greatly improves the current response speed;

2) direct digital waveform synthesis achieves high temporal resolution;

3) the phase-shifting device can be synchronously configured in any phase, and can realize pulse superposition, synchronous beam combination and phase shifting in application.

Drawings

FIG. 1 is a schematic diagram of the present invention;

fig. 2 is a schematic diagram of one application of the present invention.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

As shown in fig. 1, the high-power high-speed laser waveform generator with a synchronization function provided by the present invention includes a high-speed constant current driving module capable of generating any waveform output and a laser generator driven by the high-speed constant current driving module.

The high-speed constant current driving module comprises a configurable delay input unit 104, a configurable delay output unit 105, a waveform data output unit 115, a high-speed digital-to-analog conversion unit 108 and a closed-loop controllable current output unit.

After the trigger input signal 101 is input to the delay input unit 104, the waveform data output unit 115 is input. On the other hand, after passing through the delay input unit 104, the trigger input signal 101 passes through the configurable delay output unit 105 to generate the trigger output signal 102. The trigger output signal 102 can be used as a trigger input signal 101 of another high-power high-speed laser waveform generating device cascaded with the current high-power high-speed laser waveform generating device.

The waveform data output unit 115 includes an address generation unit 106 and a data storage unit 107. Waveform data, which includes amplitude, frequency, and phase, incoming through the control interface 103 is stored in the data storage unit 107. The waveform data output unit 115 receives the signal output by the delay input unit 104, reads the data stored in the data storage unit 107 according to the address generated by the address generation unit 106, and outputs the data to the high-speed digital-to-analog conversion unit 108.

In this embodiment, the delay input unit 104, the delay output unit 105, the address generation unit 106, and the data storage unit 107 are designed by using a programmable logic device, and the data storage unit 107 is an internal RAM. The waveform data output unit 115 preloads the waveform data to the internal RAM, and the address generation unit 106 reads the internal RAM and outputs the read waveform data to the high speed digital-to-analog conversion unit 108.

The high-speed dac 108 converts the digital signal into an analog signal and outputs the analog signal to the closed-loop controllable current output unit. In this embodiment, the high-speed digital-to-analog conversion unit 108 employs an ADI 125Msps DAC chip.

The closed-loop controllable current output unit includes a current control unit 109, a current buffer unit 110, a current feedback unit 111, and a constant current generation unit 112 forming a closed loop. The current control unit 109 receives the analog signal from the high-speed digital-to-analog conversion unit 108 and the current signal fed back by the current feedback unit 111, and outputs a control signal to the constant current generation unit 112 via the current buffer unit 110. The current signal output by the constant current generating unit 112 is used to drive a laser generating device (in this embodiment, an electro-optical switching group unit 113) for generating a laser signal 114. On the other hand, the constant current generating unit 112 feeds back the output current signal to the current control unit 109 through the current feedback unit 111, thereby realizing closed-loop control. In this embodiment, the current control unit 109 adopts a high-voltage slew rate operational amplifier, and the bandwidth is greater than 100 MHz. The current buffer unit 110 is a current buffer chip. The current feedback unit 111 adopts a current sampling resistor, the resistance is 0.1 Ω, and a heat dissipation design is required. The constant current generation unit 112 uses an NMOS chip, and a heat dissipation design is required.

As shown in fig. 2, the application of the high-power high-speed laser waveform generator with synchronization function in this embodiment is to cascade the two high-power high-speed laser waveform generators, which are respectively a high-power high-speed laser waveform generator 202 and a high-power high-speed laser waveform generator 203. A programmable logic device 201 is used to implement the delay input unit 104, the delay output unit 105, the address generation unit 106, and the data storage unit 107. The trigger output signal 102 output by the high-power high-speed laser waveform generating device 202 is used as the trigger input signal 101 of the high-power high-speed laser waveform generating device 203, and laser output with any phase difference or laser output with superposed amplitude can be obtained by configuring the input delay time of the high-power high-speed laser waveform generating device 203. The two laser signals 114 output by the high-power high-speed laser waveform generator 202 and the high-power high-speed laser waveform generator 203 are combined into 1 path of output by the combining unit 116.