单掺铥固体激光器电光腔倒空技术研究
发布时间：2018-11-28 07:24
【摘要】：2μm高重频、窄脉宽脉冲激光可广泛应用于激光雷达、远程遥感等领域。电光腔倒空技术可以实现高重频窄脉宽激光输出,并且具有调制速度快,调制效率高等优点。所以研究单掺铥固体激光器的电光腔倒空具有一定的实用价值。本论文主要从理论和实验两个方面对单掺铥固体激光器的电光腔倒空技术进行研究。理论部分,首先基于Tm3+的能级跃迁和能量传递过程,建立了常温下单掺Tm3+连续运转的激光速率方程,模拟分析了腔倒空光场建立阶段谐振腔内光子数和晶体上能级粒子数随时间变化的趋势以及倒空光场的产生。然后,分别讨论了驱动器电信号的开关速度、谐振腔长度对脉冲的影响,以及腔倒空稳定性与重频的关系。在实验部分,在考虑晶体热透镜的情况下,根据ABCD矩阵和稳区条件,对谐振腔进行了设计,并完成了Tm:YAP晶体和Tm:Lu AG晶体的电光腔倒空实验。对于Tm:YAP晶体,我们进行了电光腔倒空的长腔和短腔实验。在短腔实验中,泵浦光对RTP晶体的热作用严重影响了脉冲稳定性。为优化实验结果,进行了长腔腔倒空实验,并最终获得了平均功率为3.02 W,脉冲宽度为7.1 ns,输出波长为1996.9 nm的相对稳定的脉冲激光输出。此时,高功率的泵浦光对电光晶体的调制作用依然产生了一定影响,从而导致脉冲前沿上翘。对于Tm:Lu AG晶体,同样进行了电光腔倒空的长腔和短腔实验。长腔实验中,高压时间确定的条件下,随着重复频率的降低,谐振腔逐渐变成了非稳腔。为使谐振腔在低重复频率下能保持稳定,缩短腔长,最终获得了稳定的腔倒空脉冲激光输出。其最大输出功率为1.22 W,对应脉冲宽度为3.5 ns,输出波长为2012.7 nm。
[Abstract]:2 渭 m high repetition frequency, narrow pulse width pulse laser can be widely used in laser radar, remote sensing and other fields. High repetition frequency and narrow pulse width laser output can be realized by electro-optic cavity emptying technology, and it has the advantages of high modulation speed and high modulation efficiency. So it has certain practical value to study the electro-optic cavity emptying of thulium-doped solid-state laser. In this paper, the electro-optic cavity emptying technology of thulium doped solid state laser is studied theoretically and experimentally. In the theoretical part, based on the energy level transition and energy transfer process of Tm3, the laser rate equation of Tm3 continuous operation at room temperature is established. The variation trend of photon number and the number of upper level particles in the cavity with time and the generation of the inverted light field during the establishment of the cavity inverted light field are simulated and analyzed. Then, the effects of the switch speed, the length of the resonator on the pulse, and the relationship between the cavity emptying stability and the repetition rate are discussed respectively. In the experimental part, the resonator is designed according to the ABCD matrix and the condition of stable region, and the electro-optic cavity emptying experiment of Tm:YAP crystal and Tm:Lu AG crystal is completed under the consideration of the crystal thermal lens. For Tm:YAP crystal, long and short cavity experiments of electro-optic cavity emptying have been carried out. In short cavity experiment, the thermal effect of pump light on RTP crystal seriously affects the pulse stability. In order to optimize the experimental results, a relatively stable laser output with an average power of 3.02 W and a pulse width of 7.1 ns, with a wavelength of 1996.9 nm was obtained. At this time, the modulation of the electro-optic crystal is still affected by the high power pump light, which leads to the upwarping of the pulse front. For Tm:Lu AG crystal, the experiments of long and short cavities with electro-optic cavity emptying are also carried out. In the long cavity experiment, the resonator becomes unstable with the decrease of repetition rate under the condition of high voltage time. In order to keep the resonator stable at low repetition rate and shorten the cavity length, a stable cavity inverted pulse laser output is obtained. The maximum output power is 1. 22 W and the corresponding pulse width is 3. 5 ns,. The output wavelength is 2012.7 nm..
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.1
[Abstract]:2 渭 m high repetition frequency, narrow pulse width pulse laser can be widely used in laser radar, remote sensing and other fields. High repetition frequency and narrow pulse width laser output can be realized by electro-optic cavity emptying technology, and it has the advantages of high modulation speed and high modulation efficiency. So it has certain practical value to study the electro-optic cavity emptying of thulium-doped solid-state laser. In this paper, the electro-optic cavity emptying technology of thulium doped solid state laser is studied theoretically and experimentally. In the theoretical part, based on the energy level transition and energy transfer process of Tm3, the laser rate equation of Tm3 continuous operation at room temperature is established. The variation trend of photon number and the number of upper level particles in the cavity with time and the generation of the inverted light field during the establishment of the cavity inverted light field are simulated and analyzed. Then, the effects of the switch speed, the length of the resonator on the pulse, and the relationship between the cavity emptying stability and the repetition rate are discussed respectively. In the experimental part, the resonator is designed according to the ABCD matrix and the condition of stable region, and the electro-optic cavity emptying experiment of Tm:YAP crystal and Tm:Lu AG crystal is completed under the consideration of the crystal thermal lens. For Tm:YAP crystal, long and short cavity experiments of electro-optic cavity emptying have been carried out. In short cavity experiment, the thermal effect of pump light on RTP crystal seriously affects the pulse stability. In order to optimize the experimental results, a relatively stable laser output with an average power of 3.02 W and a pulse width of 7.1 ns, with a wavelength of 1996.9 nm was obtained. At this time, the modulation of the electro-optic crystal is still affected by the high power pump light, which leads to the upwarping of the pulse front. For Tm:Lu AG crystal, the experiments of long and short cavities with electro-optic cavity emptying are also carried out. In the long cavity experiment, the resonator becomes unstable with the decrease of repetition rate under the condition of high voltage time. In order to keep the resonator stable at low repetition rate and shorten the cavity length, a stable cavity inverted pulse laser output is obtained. The maximum output power is 1. 22 W and the corresponding pulse width is 3. 5 ns,. The output wavelength is 2012.7 nm..
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.1
【参考文献】
相关期刊论文 前4条
1 段小明;姚宝权;张云军;宋成伟;鞠有伦;王月珠;;Diode-pumped high-efficiency Tm:YLF laser at room temperature[J];Chinese Optics Letters;2008年08期
2 朱少岚;赵卫;刘百玉;施卫;杨延龙;;利用高速GaAs光电导开关实现腔倒空激光脉冲输出[J];中国激光;2011年05期
3 卿光弼;张承铨;刘韵;贺安之;;声光腔倒空Nd:YAG激光器的理论分析[J];激光技术;1993年01期
4 吕建华;魏洁云;刘伟;朱三又;程关，
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