Development of a High-Energy Picosecond Mid-Infrared Laser Based on ZnGeP2 Optical Parametric Generator/Amplifier

IF 4.1 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Lightwave Technology Pub Date : 2024-10-23 DOI:10.1109/JLT.2024.3485240

Disheng Wei;Minglang Wu;Wenhao Cheng;Jinwen Tang;Junhui Li;Xiaoxiao Hua;Baoquan Yao;Tongyu Dai;Xiaoming Duan

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Abstract

We developed a high-energy picosecond mid-infrared laser based on ZnGeP₂ (ZGP) optical parametric generator (OPG)/optical parametric amplifier (OPA), operating at a pulse repetition frequency (PRF) of 1 kHz. The laser system was equipped with a 2.09 μm high-energy picosecond laser amplification system as the pump source. The pump source itself incorporated a gain-switched laser diode (GSLD) as the seed. By employing a holmium:yttrium-aluminum-garnet (Ho:YAG) regenerative amplifier (RA) and multi-stage power amplifiers, we successfully achieved a maximum pulse energy of 26.2 mJ at a wavelength of 2.09 μm. Initially, using a ZGP OPG and a one-stage OPA, we achieved mid-infrared laser output of over 6.4 mJ. However, the corresponding beam quality deteriorated, with beam quality factors (M²) exceeding 50 in both the x and y directions. To mitigate this issue, we transitioned to a ZGP OPG coupled with a two-stage OPA configuration, resulting in a mid-infrared laser output of over 6 mJ, accompanied by improved beam quality factors of 17.2 and 14.7 in the respective directions. Notably, the overall optical-to-optical conversion efficiency (OOCE) of the system surpassed 40%, with the second-stage OPA demonstrating an impressive OOCE exceeding 45%.

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基于ZnGeP2光参量产生/放大器的高能皮秒中红外激光器的研制

研制了一种基于ZnGeP2 （ZGP）光参量发生器(OPG)/光参量放大器（OPA）的高能皮秒中红外激光器，工作脉冲重复频率（PRF）为1khz。激光系统采用2.09 μm高能皮秒激光放大系统作为泵浦源。泵浦源本身包含一个增益开关激光二极管（GSLD）作为种子。采用钬钇铝石榴石（Ho:YAG）再生放大器（RA）和多级功率放大器，在波长2.09 μm处获得了最大脉冲能量26.2 mJ。最初，使用ZGP OPG和一级OPA，我们实现了超过6.4 mJ的中红外激光输出。然而，相应的光束质量变差，x和y方向的光束质量因子（M2）均超过50。为了缓解这个问题，我们将ZGP OPG与两级OPA配置相结合，从而获得超过6 mJ的中红外激光输出，并在各自方向上提高了17.2和14.7的光束质量因子。值得注意的是，该系统的整体光-光转换效率（OOCE）超过了40%，其中第二阶段OPA的OOCE超过了45%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Lightwave Technology 工程技术-工程：电子与电气

CiteScore

9.40

自引率

14.90%

发文量

936

审稿时长

3.9 months

期刊介绍： The Journal of Lightwave Technology is comprised of original contributions, both regular papers and letters, covering work in all aspects of optical guided-wave science, technology, and engineering. Manuscripts are solicited which report original theoretical and/or experimental results which advance the technological base of guided-wave technology. Tutorial and review papers are by invitation only. Topics of interest include the following: fiber and cable technologies, active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; and systems, subsystems, new applications and unique field trials. System oriented manuscripts should be concerned with systems which perform a function not previously available, out-perform previously established systems, or represent enhancements in the state of the art in general.