大口径谐振腔式固体激光中的动力学不稳定性研究

苏华; 魏玉欣; 王小军; 唐淳

doi:10.11884/HPLPB201426.071008

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大口径谐振腔式固体激光中的动力学不稳定性研究

苏华, 魏玉欣, 王小军, 唐淳

文章导航 > 强激光与粒子束 > 2014 > 26: 071008

苏华, 魏玉欣, 王小军, 等. 大口径谐振腔式固体激光中的动力学不稳定性研究[J]. 强激光与粒子束, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

引用本文:

苏华, 魏玉欣, 王小军, 等. 大口径谐振腔式固体激光中的动力学不稳定性研究[J]. 强激光与粒子束, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

Su Hua, Wei Yuxin, Wang Xiaojun, et al. Dynamics instability in large-scale resonator based solid-state lasers[J]. High Power Laser and Particle Beams, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

Citation:

Su Hua, Wei Yuxin, Wang Xiaojun, et al. Dynamics instability in large-scale resonator based solid-state lasers[J]. High Power Laser and Particle Beams, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

大口径谐振腔式固体激光中的动力学不稳定性研究

doi: 10.11884/HPLPB201426.071008

苏华^1,2,3,
魏玉欣^1,2,
王小军^1,2,
唐淳^1,4

1.
中国工程物理研究院高能激光科学与技术重点实验室, 四川绵阳 621 999;
2.
北京应用物理与计算数学研究所, 北京 1 00088;
3.
中国工程物理研究院研究生部, 北京 1 00088;
4.
中国工程物理研究院应用电子学研究所, 四川绵阳 621 999

Dynamics instability in large-scale resonator based solid-state lasers

Su Hua^1,2,3,
Wei Yuxin^1,2,
Wang Xiaojun^1,2,
Tang Chun^1,4

1.
The Key Laboratory of Science and Technology on High Energy Laser,CAEP,Mianyang 612999,China;
2.
Institute of Applied Physics and Computational Mathematics,P.O.Box 8009,Beijing 100088,China;
3.
Graduate School of CAEP,Beijing 100088,China;
4.
Institute of Applied Electronics,CAEP,P.O.Box 919-1015,Mianyang 612999,China

摘要: 大口径谐振腔式固体激光定标到足够高功率后，由于非稳定腔内激光不对称振荡导致介质上激光强度横向不均匀，激光提取与介质产热耦合会引起激光输出功率和光束质量在时域上的不稳定性。针对三种激光器构型：Nd:YAG 薄片、Yb:YAG薄片和浸入式液冷叠片激光器，通过理论分析与数值模拟揭示了其各自不同的光热耦合机制及其影响因素，给出了激光输出的瞬态演化规律。结果表明，前两种构型中基于激光动力学的光热耦合具有饱和效应，其动力学不稳定性只出现在特定参数区间，可以通过恰当的设计加以避免；第三种构型中动力学不稳定性表现出明显的阈值特征，在强光状态下只能通过减少冷却液吸收系数来抑制。
- 谐振腔 /
- 固体激光 /
- 光热耦合 /
- 动力学不稳定
Abstract: Similar with the mode instability in high-power fiber lasers induced by multimode interference and optical-thermal coupling, the output power and the beam quality of large-scale resonator based solid state lasers turn out to be irregularly temporal jitter along with high output power. This phenomenon is mainly due to medium intensity inhomogeneous which results from asymmetric laser oscillation within the unstable resonator and coupling between laser extraction and medium heat generation. For three different laser types, Nd: YAG thin-disk laser, Yb: YAG thin-disk laser and immersed liquid-cooled disk laser, theoretical analysis and numerical simulation are conducted in order to provide basic rules of laser output and distinct optical-thermal coupling mechanism. The results show that dynamics instability only appears within a certain interval since the dynamics presents saturation effects for the former two kinds of lasers. Thus, the instability can be avoided by choosing proper parameters. But for immersed liquid-cooled disk laser, it has obvious threshold under strong optical intensity, dynamics instability can be suppressed only by lower cooling absorption coefficient.
- resonator /
- solid-state laser /
- optic-thermal coupling /
- dynamics instability

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大口径谐振腔式固体激光中的动力学不稳定性研究

doi: 10.11884/HPLPB201426.071008

1. 中国工程物理研究院高能激光科学与技术重点实验室, 四川绵阳 621 999;

2. 北京应用物理与计算数学研究所, 北京 1 00088;

3. 中国工程物理研究院研究生部, 北京 1 00088;

4. 中国工程物理研究院应用电子学研究所, 四川绵阳 621 999

收稿日期: 2014-01-04
修回日期: 2014-03-17
刊出日期: 2014-06-10

关键词:

谐振腔 /

固体激光 /

光热耦合 /

动力学不稳定

摘要: 大口径谐振腔式固体激光定标到足够高功率后，由于非稳定腔内激光不对称振荡导致介质上激光强度横向不均匀，激光提取与介质产热耦合会引起激光输出功率和光束质量在时域上的不稳定性。针对三种激光器构型：Nd:YAG 薄片、Yb:YAG薄片和浸入式液冷叠片激光器，通过理论分析与数值模拟揭示了其各自不同的光热耦合机制及其影响因素，给出了激光输出的瞬态演化规律。结果表明，前两种构型中基于激光动力学的光热耦合具有饱和效应，其动力学不稳定性只出现在特定参数区间，可以通过恰当的设计加以避免；第三种构型中动力学不稳定性表现出明显的阈值特征，在强光状态下只能通过减少冷却液吸收系数来抑制。

English Abstract

Dynamics instability in large-scale resonator based solid-state lasers

1. The Key Laboratory of Science and Technology on High Energy Laser,CAEP,Mianyang 612999,China;

2. Institute of Applied Physics and Computational Mathematics,P.O.Box 8009,Beijing 100088,China;

3. Graduate School of CAEP,Beijing 100088,China;

4. Institute of Applied Electronics,CAEP,P.O.Box 919-1015,Mianyang 612999,China

Received Date: 2014-01-04
Rev Recd Date: 2014-03-17
Publish Date: 2014-06-10

Keywords:

Abstract: Similar with the mode instability in high-power fiber lasers induced by multimode interference and optical-thermal coupling, the output power and the beam quality of large-scale resonator based solid state lasers turn out to be irregularly temporal jitter along with high output power. This phenomenon is mainly due to medium intensity inhomogeneous which results from asymmetric laser oscillation within the unstable resonator and coupling between laser extraction and medium heat generation. For three different laser types, Nd: YAG thin-disk laser, Yb: YAG thin-disk laser and immersed liquid-cooled disk laser, theoretical analysis and numerical simulation are conducted in order to provide basic rules of laser output and distinct optical-thermal coupling mechanism. The results show that dynamics instability only appears within a certain interval since the dynamics presents saturation effects for the former two kinds of lasers. Thus, the instability can be avoided by choosing proper parameters. But for immersed liquid-cooled disk laser, it has obvious threshold under strong optical intensity, dynamics instability can be suppressed only by lower cooling absorption coefficient.

苏华, 魏玉欣, 王小军, 等. 大口径谐振腔式固体激光中的动力学不稳定性研究[J]. 强激光与粒子束, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

引用本文:

苏华, 魏玉欣, 王小军, 等. 大口径谐振腔式固体激光中的动力学不稳定性研究[J]. 强激光与粒子束, 2014, 26: 071008. doi: 10.11884/HPLPB201426.071008

Citation: