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

IF 4.6 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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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