CN209200369U - A pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal - Google Patents

A pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal Download PDF

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CN209200369U
CN209200369U CN201920037578.2U CN201920037578U CN209200369U CN 209200369 U CN209200369 U CN 209200369U CN 201920037578 U CN201920037578 U CN 201920037578U CN 209200369 U CN209200369 U CN 209200369U
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optic
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卢一鑫
成桢
杨森林
付福兴
赵小侠
王红英
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Xian University
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Abstract

本实用新型公开了一种基于MgO:LN晶体预偏置电光调Q全固态激光器,包括全反射镜(1)、电光晶体(2)、偏振片(3)、激光晶体(4)、输出镜(5)、同步延迟器(6)、信号发生器(7);所述全反射镜(1)、电光晶体(2)、偏振片(3)、激光晶体(4)、输出镜(5)依次设置,所述同步延迟器(6)连接至电光晶体(2)和激光晶体(4),所述信号发生器(6)连接至同步延迟器(7)。本实用新型的高能量、窄脉宽、高重复频率的1064nm半导体激光泵浦全固态激光器具有较好的光束质量以及较长的使用寿命,同时具有结构紧凑的优点,可以应用在医疗、工业、军事等诸多等领域,获得稳定输出且具有较窄的脉冲宽度以及MW量级峰值功率的1064nm半导体激光主要通过电光调Q技术实现的。

The utility model discloses an electro-optic Q-switched all-solid-state laser based on MgO:LN crystal pre-bias, which comprises a total reflection mirror (1), an electro-optic crystal (2), a polarizer (3), a laser crystal (4), and an output mirror (5), synchronous delayer (6), signal generator (7); the total reflection mirror (1), electro-optic crystal (2), polarizer (3), laser crystal (4), output mirror (5) Arranged in sequence, the synchronous delayer (6) is connected to the electro-optic crystal (2) and the laser crystal (4), and the signal generator (6) is connected to the synchronous delayer (7). The 1064nm semiconductor laser pumped all-solid-state laser with high energy, narrow pulse width and high repetition frequency of the utility model has better beam quality and longer service life, and has the advantage of compact structure at the same time, and can be applied in medical treatment, industry, In many fields such as the military, the 1064nm semiconductor laser with stable output, narrow pulse width and MW-level peak power is mainly realized through electro-optic Q-switching technology.

Description

一种基于MgO:LN晶体预偏置电光调Q全固态激光器A pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal

技术领域technical field

本实用新型涉及激光器领域,尤其涉及一种基于MgO:LN晶体预偏置电光调Q全固态激光器。The utility model relates to the field of lasers, in particular to a pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystals.

背景技术Background technique

增益介质激发上能级储能的加压式电光调Q激光器可以获得脉冲宽度10ns左右的短脉冲激光输出,但基于LD端面泵浦效率较低,光路较复杂,常见的电光晶体BBO、KD*P易潮解,RTP价格较贵, LGS损伤阈值较低,影响使用。The pressurized electro-optic Q-switched laser with a pulse width of about 10 ns can be obtained by a pressurized electro-optic Q-switched laser that is excited by the gain medium to store energy at the upper level. However, based on LD end-pumping, the efficiency is low and the optical path is relatively complicated. Common electro-optic crystals BBO and KD* P is prone to deliquescence, RTP is more expensive, and LGS has a lower damage threshold, which affects its use.

实用新型内容Utility model content

为解决现有技术中的上述缺陷,本实用新型公开了一种基于MgO:LN晶体预偏置电光调Q全固态激光器。In order to solve the above-mentioned defects in the prior art, the utility model discloses a pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal.

本实用新型是通过以下技术方案来实现的:The utility model is achieved through the following technical solutions:

一种基于MgO:LN晶体预偏置电光调Q全固态激光器,包括全反射镜、电光晶体、偏振片、激光晶体、输出镜、同步延迟器、信号发生器;所述全反射镜、电光晶体、偏振片、激光晶体、输出镜依次设置,所述同步延迟器连接至电光晶体和激光晶体,所述信号发生器连接至同步延迟器。A pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal, comprising a total reflection mirror, an electro-optic crystal, a polarizer, a laser crystal, an output mirror, a synchronous retarder, and a signal generator; the total reflection mirror, an electro-optic crystal , a polarizer, a laser crystal, and an output mirror are sequentially arranged, the synchronous retarder is connected to the electro-optic crystal and the laser crystal, and the signal generator is connected to the synchronous retarder.

优选地,所述全反射镜渡制1064nm高透射膜。Preferably, the total reflection mirror is made of a 1064nm high-transmission film.

优选地,所述电光晶体为MgO:LN晶体,其尺寸为7mm×7 mm×20mm,两个通光镀制1064nm高反膜。Preferably, the electro-optic crystal is a MgO:LN crystal with a size of 7 mm×7 mm×20 mm, two of which are plated with a 1064nm high reflection film.

优选地,所述偏振片的厚度为2mm,直径为20mm,镜面法线方向与谐振腔通光轴之间的夹角均为55.0°-56.0°的布儒斯特角。Preferably, the thickness of the polarizer is 2 mm, the diameter is 20 mm, and the included angle between the normal direction of the mirror surface and the optical axis of the resonant cavity is Brewster's angle of 55.0°-56.0°.

优选地,所述激光晶体为Nd:YAG晶体棒,其尺寸为φ3mm×65 mm,其两个通光均镀制1064nm高透射膜。Preferably, the laser crystal is a Nd:YAG crystal rod with a size of φ3 mm×65 mm, and both of its two passes are coated with a 1064nm high-transmittance film.

优选地,所述输出镜为40%输出镜。Preferably, the output mirror is a 40% output mirror.

本实用新型的有益效果是:The beneficial effects of the present utility model are:

高能量、窄脉宽、高重复频率的1064nm半导体激光泵浦全固态激光器具有较好的光束质量以及较长的使用寿命,同时具有结构紧凑的优点,可以应用在医疗、工业、军事等诸多等领域,获得稳定输出且具有较窄的脉冲宽度以及MW量级峰值功率的1064nm半导体激光主要通过电光调Q技术实现的。High energy, narrow pulse width, high repetition rate 1064nm semiconductor laser pumped all-solid-state laser has better beam quality and longer service life, and has the advantage of compact structure, which can be used in medical, industrial, military, etc. In the field, the 1064nm semiconductor laser with stable output, narrow pulse width and MW level peak power is mainly realized by electro-optic Q-switching technology.

采用了LD侧面泵浦长尺寸、高掺杂的Nd:YAG增益介质,基于 MgO:LN晶体的预偏置技术和同步延迟技术,获得了在重复频率1kHz 和200Hz时,最大平均输出功率分别为15.4W和8.4W的1064nm脉冲激光输出,相应的脉冲宽度21ns和10ns,其脉冲宽度峰峰值不稳定度分别为±4.75%和±3.25%,同时在重复频率1kHz时测得因子 M2为M2x=4.13,M2y=4.65,实验结果可为激光打标、激光切割、激光打孔、激光测距、遥感、非线性光学频率变换等领域提供应用参考。Using LD side-pumped long-sized, highly doped Nd:YAG gain medium, based on MgO:LN crystal pre-bias technology and synchronous delay technology, the maximum average output power at the repetition frequency of 1kHz and 200Hz is respectively 1064nm pulsed laser output of 15.4W and 8.4W, the corresponding pulse width is 21ns and 10ns, the peak-to-peak instability of the pulse width is ±4.75% and ±3.25% respectively, and the factor M2 measured at the repetition frequency of 1kHz is M2x= 4.13, M2y=4.65, the experimental results can provide application reference for laser marking, laser cutting, laser drilling, laser ranging, remote sensing, nonlinear optical frequency conversion and other fields.

附图说明Description of drawings

图1是本实用新型的结构示意图;Fig. 1 is the structural representation of the utility model;

图中:1.全反射镜 2.电光晶体 3.偏振片 4.激光晶体 5. 输出镜 6.同步延迟器7.信号发生器。In the figure: 1. Total reflection mirror 2. Electro-optic crystal 3. Polarizer 4. Laser crystal 5. Output mirror 6. Synchronous delay device 7. Signal generator.

具体实施方式Detailed ways

为使本实用新型的技术方案便于理解,下面结合具体实施例与附图说明对本实用新型作进一步的说明。In order to make the technical solution of the utility model easier to understand, the utility model will be further described below in conjunction with specific embodiments and accompanying drawings.

如图1所示,一种基于MgO:LN晶体预偏置电光调Q全固态激光器,包括全反射镜1、电光晶体2、偏振片3、激光晶体4、输出镜 5、同步延迟器6、信号发生器7;所述全反射镜1、电光晶体2、偏振片3、激光晶体4、输出镜5依次设置,所述同步延迟器6连接至电光晶体2和激光晶体4,所述信号发生器7连接至同步延迟器6。As shown in Figure 1, a pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal includes a total reflection mirror 1, an electro-optic crystal 2, a polarizer 3, a laser crystal 4, an output mirror 5, a synchronous delay 6, Signal generator 7; the total reflection mirror 1, electro-optic crystal 2, polarizer 3, laser crystal 4, and output mirror 5 are arranged in sequence, and the synchronous delayer 6 is connected to the electro-optic crystal 2 and the laser crystal 4, and the signal generation The device 7 is connected to the synchronous delay device 6.

所述全反射镜1镀制1064nm高透射膜(R>99.8﹪)。The total reflection mirror 1 is coated with a 1064nm high transmission film (R>99.8%).

所述电光晶体2为MgO:LN晶体,其尺寸为7mm×7mm×20mm,两个通光镀制1064nm高反膜(R>99.8﹪),杂氧化镁的铌酸锂 (MgO:LN)晶体在具备一般非掺杂铌酸锂晶体(LN)横向半波电压较低的同时,可大幅提高其抗光干扰性和抗光折变性,承受光强比一般 LN晶体提高了两个数量级;且基于MgO:LN晶体的预偏置技术,其较于传统基于Nd:YAG增益介质加压式的电光调Q技术省去了λ/4波片,减少了光路中的器件损耗,从而可以提高其输出功率。The electro-optic crystal 2 is a MgO:LN crystal with a size of 7mm×7mm×20mm, two crystals of lithium niobate (MgO:LN) mixed with magnesium oxide and coated with a 1064nm high reflection film (R>99.8%) While possessing the low transverse half-wave voltage of general non-doped lithium niobate crystal (LN), it can greatly improve its anti-light interference and anti-photorefractive properties, and its light intensity is two orders of magnitude higher than that of general LN crystal; and The pre-bias technology based on MgO:LN crystal, compared with the traditional Nd:YAG gain medium pressurized electro-optic Q-switching technology, saves the λ/4 wave plate, reduces the device loss in the optical path, and thus can improve its Output Power.

所述偏振片3的厚度为2mm,直径为20mm,镜面法线方向与谐振腔通光轴之间的夹角均为55.0°-56.0°的布儒斯特角。The polarizer 3 has a thickness of 2mm and a diameter of 20mm, and the included angle between the normal direction of the mirror surface and the optical axis of the resonant cavity is Brewster's angle of 55.0°-56.0°.

所述激光晶体4为Nd:YAG晶体棒,其尺寸为φ3mm×65mm,其两个通光均镀制1064nm高透射膜(R>99.8﹪)。The laser crystal 4 is a Nd:YAG crystal rod with a size of φ3mm×65mm, both of which are plated with a 1064nm high-transmittance film (R>99.8%).

所述输出镜5为40%输出镜。The output mirror 5 is a 40% output mirror.

本实用新型的原理如下:激光电源放到外控,由同步脉冲信号发生器向脉冲LD泵浦模块驱动电源与MgO:LN晶体高压驱动电源提供触发脉冲信号,通过调节两个信号的延迟触发时间,保证对于 MgO:LN晶体加压与触发808nm脉冲LD泵浦光精确同步,达到最大腔内储能的目的。其中,LD泵浦模块为侧面三向、相邻的夹角为 120°LD阵列,激光增益介质为Nd:YAG晶体棒,脉冲LD中心发射波长为808nm,脉冲重复频率为1kHz-1Hz可调,泵浦占空比20%,脉冲宽度为250μs,MgO:LN晶体沿光轴偏转角度根据理论计算θ=2.96°,P-偏振光通过预偏置角度MgO:LN晶体时,处于高损耗,低Q值,谐振腔无法产生振荡,没有激光输出;MgO:LN晶体加上电压,沿偏离光轴以合适的角度θ入射,通过MgO:LN晶体后,可以使出射光产生的相位差π/2,其效果等同于λ/4波片,谐振腔产生激光振荡,处于低损耗,高Q值,谐振腔内P-偏振光输出。The principle of the utility model is as follows: the laser power supply is placed in the external control, and the synchronous pulse signal generator provides the trigger pulse signal to the pulse LD pump module drive power supply and the MgO:LN crystal high-voltage drive power supply. By adjusting the delay trigger time of the two signals , to ensure precise synchronization between pressurizing the MgO:LN crystal and triggering the 808nm pulsed LD pump light, so as to achieve the purpose of maximum energy storage in the cavity. Among them, the LD pump module is a side three-way, adjacent LD array with an angle of 120°, the laser gain medium is Nd:YAG crystal rod, the center emission wavelength of pulse LD is 808nm, and the pulse repetition frequency is adjustable from 1kHz to 1Hz. The duty cycle of the pump is 20%, the pulse width is 250μs, and the deflection angle of the MgO:LN crystal along the optical axis is θ=2.96° according to theoretical calculations. Q value, the resonant cavity cannot generate oscillation, and there is no laser output; MgO:LN crystal is applied with voltage, and it is incident at a suitable angle θ along the deviation from the optical axis. After passing through the MgO:LN crystal, the phase difference generated by the outgoing light can be π/2 , its effect is equivalent to the λ/4 wave plate, the resonant cavity generates laser oscillation, with low loss, high Q value, and P-polarized light output in the resonant cavity.

本实施例的有益效果是:采用了LD侧面泵浦长尺寸、高掺杂的 Nd:YAG增益介质,基于MgO:LN晶体的预偏置技术和同步延迟技术,获得了在重复频率1kHz和200Hz时,最大平均输出功率分别为 15.4W和8.4W的1064nm脉冲激光输出,相应的脉冲宽度21ns和 10ns,其脉冲宽度峰峰值不稳定度分别为±4.75%和±3.25%,同时在重复频率1kHz时测得因子M2为M2x=4.13,M2y=4.65,实验结果可为激光打标、激光切割、激光打孔、激光测距、遥感、非线性光学频率变换等领域提供应用参考。The beneficial effects of this embodiment are: the LD side-pumped long-sized, highly doped Nd:YAG gain medium is adopted, based on the pre-bias technology and synchronous delay technology of MgO:LN crystal, and the repetition frequency of 1kHz and 200Hz is obtained. , the maximum average output power is 15.4W and 8.4W of 1064nm pulsed laser output, the corresponding pulse width is 21ns and 10ns, and the peak-to-peak instability of the pulse width is ±4.75% and ±3.25%, respectively. The measured factor M2 is M2x=4.13, M2y=4.65. The experimental results can provide application reference for laser marking, laser cutting, laser drilling, laser ranging, remote sensing, nonlinear optical frequency conversion and other fields.

以上所述仅为本实用新型的优选实例而已,并不用于限制本实用新型,尽管参照前述实施例对本实用新型进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本实用新型的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本实用新型的保护范围之内。The above description is only a preferred example of the utility model, and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it can still be used for the aforementioned items. The technical solutions described in the embodiments are modified, or equivalent replacements are made to some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. one kind is based on the electric-optically Q-switched all solid state laser of MgO:LN crystal prebias, which is characterized in that including total reflection mirror, electricity Luminescent crystal, polarizing film, laser crystal, outgoing mirror, synchronization delay device, signal generator;The total reflection mirror, electro-optic crystal, partially Vibration piece, laser crystal, outgoing mirror are set gradually, and the synchronization delay device is connected to electro-optic crystal and laser crystal, the signal Generator is connected to synchronous delayer.
2. all solid state laser according to claim 1, which is characterized in that it is highly transmissive that the total reflection mirror is coated with 1064nm Film.
3. all solid state laser according to claim 1, which is characterized in that the electro-optic crystal is MgO:LN crystal, Having a size of 7mm × 7mm × 20mm, two light passings are coated with 1064nm high-reflecting film.
4. all solid state laser according to claim 1, which is characterized in that the polarizing film with a thickness of 2mm, diameter is 20mm, the angle between mirror normal direction and resonant cavity light passing axis are 55.0 ° -56.0 ° of Brewster's angle.
5. all solid state laser according to claim 1, which is characterized in that the laser crystal is Nd:YAG crystal bar, , having a size of φ 3mm × 65mm, two light passing is coated with the highly transmissive film of 1064nm for it.
6. all solid state laser according to claim 1, which is characterized in that the outgoing mirror is 40% outgoing mirror.
CN201920037578.2U 2019-01-10 2019-01-10 A pre-biased electro-optic Q-switched all-solid-state laser based on MgO:LN crystal Expired - Fee Related CN209200369U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110364924A (en) * 2019-08-09 2019-10-22 福建科彤光电技术有限公司 An electro-optic Q-switched laser
CN111384659A (en) * 2020-03-13 2020-07-07 中国电子科技集团公司第十一研究所 Laser resonator assembly, laser and method for tuning resonator assembly
CN114114202A (en) * 2020-08-31 2022-03-01 上海禾赛科技有限公司 Laser emitting device, lidar including the same, and detection method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110364924A (en) * 2019-08-09 2019-10-22 福建科彤光电技术有限公司 An electro-optic Q-switched laser
CN111384659A (en) * 2020-03-13 2020-07-07 中国电子科技集团公司第十一研究所 Laser resonator assembly, laser and method for tuning resonator assembly
CN111384659B (en) * 2020-03-13 2022-03-11 中国电子科技集团公司第十一研究所 Laser resonator assembly, laser and method for tuning resonator assembly
CN114114202A (en) * 2020-08-31 2022-03-01 上海禾赛科技有限公司 Laser emitting device, lidar including the same, and detection method

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