阅读说明：本技术 一种基于加声场加载驱动声光调q的低功耗激光器 (Low-power-consumption laser based on acousto-optic Q-switching of loading drive of acoustic field ) 是由 于永吉 王超 李研 金光勇 王宇恒 王子健 于 2021-07-19 设计创作，主要内容包括：本公开公开了一种基于加声场加载驱动声光调Q的低功耗激光器,所述激光器包括：泵浦源、聚焦耦合镜组、全反镜、增益介质、第一全反镜、声光Q开关、射频电源、第二全反镜,其中：所述泵浦源、聚焦耦合镜组、全反镜、增益介质、第一全反镜从左至右依次放置；所述声光Q开关放置在与第一全反镜反射后平行的光路上、射频电源放置在声光Q开关的上方、第二全反镜放在加入超声场后与光轴呈θ角度+1级衍射光方向；所述全反镜、增益介质、第一全反镜、声光Q开关和第二全反镜构成所述激光器的谐振腔。(The utility model discloses a low-power consumption laser based on add sound field loading drive acousto-optic and transfer Q, the laser includes: the device comprises a pumping source, a focusing coupling mirror group, a total reflection mirror, a gain medium, a first total reflection mirror, an acousto-optic Q switch, a radio frequency power supply and a second total reflection mirror, wherein: the pumping source, the focusing coupling mirror group, the total reflection mirror, the gain medium and the first total reflection mirror are sequentially arranged from left to right; the acousto-optic Q switch is arranged on a light path parallel to the first full reflector after being reflected, the radio frequency power supply is arranged above the acousto-optic Q switch, and the second full reflector is arranged in a theta angle + 1-order diffraction light direction with the optical axis after the ultrasonic field is added; the total reflection mirror, the gain medium, the first total reflection mirror, the acousto-optic Q switch and the second total reflection mirror form a resonant cavity of the laser.)

1. A low-power-consumption laser for driving acousto-optic Q-switching based on loading of a heating field, which is characterized by comprising: the device comprises a pumping source, a focusing coupling mirror group, a total reflection mirror, a gain medium, a first total reflection mirror, an acousto-optic Q switch, a radio frequency power supply and a second total reflection mirror, wherein:

the pumping source, the focusing coupling mirror group, the total reflection mirror, the gain medium and the first total reflection mirror are sequentially arranged from left to right;

the acousto-optic Q switch is arranged on a light path parallel to the first full reflector after being reflected, the radio frequency power supply is arranged above the acousto-optic Q switch, and the second full reflector is arranged in a theta angle + 1-order diffraction light direction with the optical axis after the ultrasonic field is added;

the total reflection mirror, the gain medium, the first total reflection mirror, the acousto-optic Q switch and the second total reflection mirror form a resonant cavity of the laser.

2. The laser of claim 1, wherein the pump light output from the pump source is focused onto the gain medium through the focusing coupling mirror and the total reflection mirror, so that the gain medium achieves sufficient population inversion and is converted into fundamental frequency light output, and the fundamental frequency light is reflected by the first total reflection mirror to the acousto-optic Q switch, and the acousto-optic Q switch converts the fundamental frequency light into pulse fundamental frequency light.

3. The laser as claimed in claim 1 or 2, wherein the rf power source is connected to the acousto-optic Q-switch for supplying power to the acousto-optic Q-switch to control the voltage inside the acousto-optic Q-switch.

4. The laser as claimed in claim 1 or 2, wherein when the rf power supply supplies power, the light reflected by the first all-mirror and entering the acousto-optic Q-switch is diffracted at an angle θ to the optical axis, and oscillates back and forth in the resonant cavity via the second all-mirror, so that the gain medium stores energy.

5. The laser of claim 4, wherein the focusing coupling system is composed of two convex lenses with different focal lengths to collimate and focus the light emitted from the pump source.

6. The laser according to claim 4 or 5, wherein the all-mirror is coated with a film that provides high transmittance of the pump light and high reflectance of the laser light of a desired wavelength.

7. The laser according to any of claims 4-6, wherein the first all-reflecting mirror is a flat mirror or a curved mirror with curvature, and has a high reflection effect on the laser light.

8. The laser according to any one of claims 4 to 7, wherein the second all-reflecting mirror is a flat mirror or a curved mirror with curvature, and has a high reflection effect on the laser light.

9. The laser according to any of claims 4-8, wherein the gain medium is a gain medium capable of particle inversion.

10. The laser according to any of claims 4-9, wherein the LN crystal in the acousto-optic Q-switch is used as a piezoelectric transducer, fused silica, which is a transparent optical material, is used as the acousto-optic interaction medium, and is coated with an anti-reflection film with high anti-reflection effect at the laser wavelength.

Technical Field

The invention relates to the technical field of lasers, in particular to a low-power-consumption laser for driving acousto-optic Q-switching based on loading of a sound adding field.

Background

Q-switch is a widely used operating mode for generating a giant pulse power laser. The active Q-switching technique has been widely used in the industrial fields of laser marking, laser etching, laser measurement, etc., wherein the acousto-optic Q-switching has obvious advantages in a mode that the acousto-optic Q-switching controls the loss of an optical cavity by using acousto-optic interaction to achieve pulse output. In the traditional acousto-optic Q-switching technology, when the sound absorption material is powered by a radio frequency power supply, light enters the acousto-optic Q-switching switch to be diffracted, the Q value in a cavity is extremely high in loss, laser oscillation cannot be formed, when no radio frequency power supply is powered, an ultrasonic field does not have a diffraction effect, the Q value in the cavity is increased suddenly, the laser oscillation is realized, the heat generated by acousto-optic driving under the condition of continuous pumping is higher than that generated by LD pumping, the heat loss is extremely high, the heat dissipation volume is greatly increased, and the miniaturization and the development of acousto-optic Q-switching of a laser are limited.

Disclosure of Invention

In order to solve the problem of heat dissipation volume of the traditional conduction cooling LD pumping acousto-optic drive, the invention provides a low-power-consumption laser for driving acousto-optic Q-switching based on loading of a heating field.

The invention provides a low-power-consumption laser for driving acousto-optic Q-switching based on loading of a heating field, which comprises: the device comprises a pumping source, a focusing coupling mirror group, a total reflection mirror, a gain medium, a first total reflection mirror, an acousto-optic Q switch, a radio frequency power supply and a second total reflection mirror, wherein:

the pumping source, the focusing coupling mirror group, the total reflection mirror, the gain medium and the first total reflection mirror are sequentially arranged from left to right;

the acousto-optic Q switch is arranged on a light path parallel to the first full reflector after being reflected, the radio frequency power supply is arranged above the acousto-optic Q switch, and the second full reflector is arranged in a theta angle + 1-order diffraction light direction with the optical axis after the ultrasonic field is added;

the total reflection mirror, the gain medium, the first total reflection mirror, the acousto-optic Q switch and the second total reflection mirror form a resonant cavity of the laser.

Optionally, the pump light output by the pump source is focused on the gain medium after passing through the focusing coupling mirror group and the total reflection mirror, so that the gain medium realizes sufficient population inversion and is converted into fundamental frequency light to be output, and the fundamental frequency light is reflected to the acousto-optic Q switch by the first total reflection mirror, and the acousto-optic Q switch converts the fundamental frequency light into pulse fundamental frequency light.

Optionally, the radio frequency power supply is connected to the acousto-optic Q switch, and is configured to supply power to the acousto-optic Q switch and control a voltage inside the acousto-optic Q switch.

Optionally, when the radio frequency power supply supplies power, light entering the acousto-optic Q switch is reflected by the first full mirror to generate a diffraction effect, and forms an angle θ with the optical axis, and the light oscillates back and forth in the resonant cavity through the second full mirror, so that the gain medium stores energy.

Optionally, the focusing coupling system is composed of two convex lenses with different focal lengths, so as to perform collimation and focusing on the light emitted by the pump source.

Optionally, the all-mirror is coated with a film that provides high transmittance of the pump light and high reflectance of the laser light of the desired wavelength.

Optionally, the first total reflection mirror is a plane mirror or a curved mirror with curvature, and has a high reflection effect on the laser light.

Optionally, the second total reflection mirror is a plane mirror or a curved mirror with curvature, and has a high reflection effect on the laser light.

Optionally, the gain medium is a gain medium capable of achieving particle inversion.

Optionally, the LN crystal in the acousto-optic Q switch is used as a piezoelectric transducer, fused quartz, which is a transparent optical material, is used as an acousto-optic interaction medium, and is plated with an anti-reflection film having a high anti-reflection effect on the laser wavelength.

The technical scheme provided by the invention has the beneficial effects that: the controllable acousto-optic Q-switch cavity can be emptied to output pulse laser, and the problem of Q-switching and heat dissipation of the traditional acousto-optic is effectively solved. The heat is sharply reduced through the cavity emptying Q switch technology, so that the heat dissipation volume of the laser is reduced, and the miniaturization of the laser is effectively realized.

Drawings

Fig. 1 is a schematic structural diagram of a low power consumption laser for driving acousto-optic Q-switching based on loading of a loading field according to an embodiment of the present disclosure.

Fig. 2(a) is a conventional acousto-optic Q-switched oscilloscope waveform diagram and a laser output Q-switched schematic diagram according to an embodiment of the disclosure.

Fig. 2(b) is a Q-switching schematic diagram of a low power consumption laser output based on a weighted field loading driven acousto-optic Q-switching according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, exemplary embodiments of the disclosed embodiments will be described in detail with reference to the accompanying drawings so that they can be easily implemented by those skilled in the art. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.

In the disclosed embodiments, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.

It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a schematic structural diagram of a low power consumption laser for driving acousto-optic Q-switching based on loading of a loading acoustic field, as shown in fig. 1, the laser includes: the device comprises a pumping source 1, a focusing coupling mirror group 2, a total reflection mirror 3, a gain medium 4, a first total reflection mirror 5, an acousto-optic Q switch 6, a radio frequency power supply 7 and a second total reflection mirror 8, wherein:

the pumping source 1, the focusing coupling lens group 2, the total reflection lens 3, the gain medium 4 and the first total reflection lens 5 are sequentially arranged from left to right;

the acousto-optic Q switch 6 is arranged on a light path parallel to the first total reflection mirror 5 after being reflected, the radio frequency power supply 7 is arranged above the acousto-optic Q switch 6, and the second total reflection mirror 8 is arranged in a theta angle + 1-order diffraction light direction with the optical axis after an ultrasonic field is added;

the total reflection mirror 3, the gain medium 4, the first total reflection mirror 5, the acousto-optic Q switch 6 and the second total reflection mirror 8 form a resonant cavity of the laser.

The pumping light output by the pumping source 1 is focused on the gain medium 4 after passing through the focusing coupling mirror group 2 and the total reflection mirror 3, so that the gain medium 4 realizes sufficient population inversion, is converted into fundamental frequency light to be output, and is reflected to the acousto-optic Q switch 6 through the first total reflection mirror 5;

the acousto-optic Q switch 6 converts the fundamental frequency light into pulse fundamental frequency light;

the radio frequency power supply 7 is connected with the acousto-optic Q switch 6 and is used for supplying power to the acousto-optic Q switch 6 and controlling the voltage inside the acousto-optic Q switch 6, and specifically, the radio frequency power supply 7 and the acousto-optic Q switch 6 are powered on and then provide electric energy for the acousto-optic Q switch 6 so as to convert the fundamental frequency light into pulse fundamental frequency light.

When the radio frequency power supply 7 supplies power, light reflected by the first total reflection mirror 5 and entering the acousto-optic Q switch 6 generates a diffraction effect, forms an angle theta with an optical axis, oscillates back and forth in the resonant cavity through the second total reflection mirror 8, and the gain medium 4 stores energy.

In an embodiment of the present disclosure, the focusing coupling system 2 is composed of two convex lenses with different focal lengths, so as to perform collimation and focusing on the light emitted by the pump source 1.

In one embodiment of the present disclosure, the all-mirror 3 is plated with a film that can make the pump light have high transmittance and make the laser with the desired wavelength have high reflectance; the first total reflection mirror 5 and the second total reflection mirror 8 are plane mirrors or curved mirrors with curvature, and have a high reflection effect on laser light.

In one embodiment of the present invention, the gain medium 4 is not limited to a specific laser material (Nd: YAG, Nd: YVO)₄Etc.) as long as it is a gain medium capable of realizing particle inversion.

In one embodiment of the present disclosure, the LN crystal in the acousto-optic Q-switch 6 is used as a piezoelectric transducer, fused quartz, which is a transparent optical material, is used as an acousto-optic interaction medium, and is plated with an anti-reflection film having a high anti-reflection effect on the laser wavelength.

Based on the technical scheme, when the laser works, after the pumping source 1 sends out pumping light to pump the gain medium 4, the pumping light is reflected by the first total reflection mirror 5 and then enters the acousto-optic Q switch 6, at the moment, the radio frequency power supply 7 applies voltage to the acousto-optic Q switch 6, an ultrasonic field is added, a Bragg diffraction effect is generated, light is transmitted towards the direction which forms theta angle + 1-order diffraction light with an optical axis, and then the light enters the laser resonant cavity after being reflected by the second total reflection mirror 8. At this time, a laser resonant cavity composed of the total reflection mirror 3, the gain medium 4, the first total reflection mirror 5, the acousto-optic Q-switch 6 and the second total reflection mirror 8 is in a low-loss state, the resonant cavity oscillates continuously, and the number of particles of the gain medium 4 accumulates to a certain extent and then jumps to a low energy level to release energy. At this time, the radio frequency power supply 7 is removed, voltage is not applied to the acousto-optic Q switch 6 any more, the ultrasonic field is removed, the loss in the cavity is increased, the particle number of the gain medium 4 is completely released, and the energy stored in the cavity is emptied by changing the Q value of the cavity so as to obtain laser output. By adopting the method, the controllable acousto-optic Q-switch cavity can be used for outputting the pulse laser in a emptying manner, the problem of acousto-optic Q-switch heat dissipation is effectively solved, and heat is rapidly reduced, so that the heat dissipation volume of the laser is reduced, and the miniaturization of the laser is effectively realized.

More specifically, when the radio frequency power supply 7 supplies power to the acousto-optic Q-switch 6, an ultrasonic field is added, ultrasonic waves irradiate on the transparent optical material fused quartz, a photoelastic effect couples a modulation strain field of the ultrasonic waves to an optical refractive index, the material is equivalent to an optical phase grating, the grating period of the optical phase grating is equivalent to the wavelength of the ultrasonic waves, and the amplitude obtained by the optical material fused quartz is proportional to the acoustic amplitude. In the resonant cavity composed of the total reflection mirror 3, the gain medium 4, the first total reflection mirror 5, the acousto-optic Q switch 6 and the second total reflection mirror 8, fundamental frequency light is reflected by the first total reflection mirror 5 after being stimulated and radiated by the gain medium 4 and then enters the acousto-optic Q switch 6 to undergo Bragg diffraction, the Q value in the resonant cavity changes suddenly, laser generated in the cavity forms an angle theta with an original optical axis at the moment, and the laser oscillates back and forth in the resonant cavity to enable the gain medium 4 to accumulate a large number of particles. After the radio frequency power supply 7 is removed and no voltage is applied to the acousto-optic Q switch 6, the ultrasonic field is removed, the loss in the resonant cavity is increased, the particle number of the gain medium 4 is completely released, and the energy stored in the resonant cavity is emptied by changing the Q value of the resonant cavity, so that laser output can be obtained.

Fig. 2(a) is a waveform diagram and a laser output Q-switching diagram of a conventional acousto-optic Q-switching oscilloscope according to an embodiment of the disclosure, and fig. 2(b) is a Q-switching diagram of a low-power-consumption laser output based on driving acousto-optic Q-switching by loading an acoustic field according to an embodiment of the disclosure, as shown in fig. 2(a), when a radio-frequency power supply supplies power, light enters an acousto-optic Q switch to be diffracted, at this time, the Q value in a cavity is extremely high in loss, laser oscillation cannot be formed, when the radio-frequency power supply does not supply power, no ultrasonic field exists, the diffraction effect disappears, the Q value in the cavity is suddenly increased, and the laser oscillation occurs; as shown in fig. 2(b), compared to (a), when the radio frequency power supply supplies power, and in the presence of an ultrasonic field, light is diffracted by the acousto-optic Q switch and then is reflected by the second full mirror to oscillate back and forth, so that the number of particles of the gain medium is accumulated to a certain extent, the ultrasonic field is removed, and laser is output.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.