100 mJ pulse operation in thermal lens Q-switching Nd: YAG MOPA

IF 5 2区物理与天体物理 Q1 OPTICS Optics and Laser Technology Pub Date : 2024-11-30 DOI:10.1016/j.optlastec.2024.112113

Zheyuan Li, Shiyu Wang, Zhen Guo, Taibo Wang, Lequn Li, Bing bin Li, Defang Cai, Qian Guo

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Abstract

In this study, we report an Nd: YAG master oscillator power amplifier(MOPA) based on a thermal lens Q-switching oscillator and unilateral side-pumped power amplifier system. We first proposed the thermal lens Q-switching oscillator as a viable method for Q-switching solid-state lasers. Here, we discuss more technical theory and details, focusing mainly on the selection of operating frequency and methods for enhancing pulse energy. Further, a two-stage unilateral side-pumped solid-state power amplifier is proposed because it has high pumping power and a compact structure and does not require water cooling. Optimal unilateral side-pumping amplification was discussed based on the simulation of the pump light and gain distribution. An above Nd: YAG MOPA device was also constructed. When the oscillator’s pump power, pump pulse width, and pump frequency are 415 W, 200 μs, and 5 Hz respectively, and the total pump power and pump pulse width of the two-stage amplifier are 4150 W, 3900 W, and 300 μs respectively, a pulse output of 85.2 mJ is generated, M² = 5.6. The results demonstrate that the Nd: YAG MOPA, based on thermal lens Q-switching, offers a viable method for generating high-energy pulses without the need for water cooling.

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热透镜调q Nd: YAG MOPA的100mj脉冲操作

在这项研究中，我们报道了一种基于热透镜调q振荡器和单边侧泵浦功率放大器系统的Nd: YAG主振荡器功率放大器（MOPA）。我们首次提出热透镜调q振荡器作为调q固体激光器的可行方法。在这里，我们讨论了更多的技术理论和细节，主要集中在工作频率的选择和增强脉冲能量的方法。进一步提出了一种两级单边侧泵浦固态功率放大器，因为它具有高泵浦功率和紧凑的结构，不需要水冷却。在模拟泵浦光和增益分布的基础上，讨论了最优单边泵浦放大。并构建了上述Nd: YAG MOPA装置。当振荡器的泵浦功率、泵浦脉宽和泵浦频率分别为415 W、200 μs和5hz，两级放大器的总泵浦功率和泵浦脉宽分别为4150 W、3900 W和300 μs时，产生的脉冲输出为85.2 mJ, M2 = 5.6。结果表明，基于热透镜q开关的Nd: YAG MOPA为不需要水冷却产生高能脉冲提供了一种可行的方法。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems