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• Photonics Research
• Vol. 10, Issue 10, 2287 (2022)
Qi Bian1、2、3, Yong Bo1、2、3、4、*, Jun-Wei Zuo1、2、3, Lei Yuan1、2、3, Hong-Wei Gao1、2、3, and Qin-Jun Peng1、2、3、5、*
Author Affiliations
• 1Key Laboratory of Solid State Laser, Technical Institute of Physics and Chemistryhttps://ror.org/04akaak77, Chinese Academy of Sciences, Beijing 100190, China
• 2Key Laboratory of Functional Crystal and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
• 3Institute of Optical Physics and Engineering Technology, Qilu Zhongke, Jinan 250000, China
• 4e-mail: boyong@tsinghua.org.cn
• 5e-mail: pengqinjun@mail.ipc.ac.cn
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Qi Bian, Yong Bo, Jun-Wei Zuo, Lei Yuan, Hong-Wei Gao, Qin-Jun Peng. High-power wavelength-tunable and power-ratio-controllable dual-wavelength operation at 1319 nm and 1338 nm in a Q-switched Nd:YAG laser[J]. Photonics Research, 2022, 10(10): 2287 Copy Citation Text show less

Abstract

We report the first demonstration on three types of 1.3 μm spectral region in a $Q$-switched Nd:YAG laser. In order to dissipate the heat deposition effectively to obtain good beam quality, the Nd:YAG rod crystal with 1° cut-angle on end faces is side-pumped by the quasi-continuous-wave pulsed laser diode. A Suprasil etalon is well designed as the intracavity mode-selector to obtain wavelength-tunable single line or power-ratio-controllable dual line operation at 1319 nm and 1338 nm. With the pump pulse width of 200 μs and pump power of 410 W, the acousto-optic $Q$-switched laser delivered a pulse width of 117 ns at 400 Hz repetition rate, and the $M2$ factor was measured to be about 1.87. 1319 nm together with 1338 nm single-wavelength laser achieved an average output power of 47.6 W and 39.9 W with a linewidth of 0.48 nm and 0.32 nm, and a tunable range of 111.2 pm and 108.6 pm, respectively. Among dual-wavelength oscillation, both lines can be tuned at almost equal intensity level with 45.7 W total output power, which is input into an LBO crystal to generate red light of 11.4 W for 659 nm, 6.7 W for 664 nm, and 7.5 W for 669 nm. The 1.3 μm wavelength-selectable operation realized by using the same laser configuration may enhance the application in the fields of tunable lasers and THz frequency generation.

1. INTRODUCTION

High-power lasers in the 1.3 μm spectral region have attracted a surge of attention for their immense applications in remote sensing, surgery, military field, optical fiber communication, information storage, and so on [13]. By frequency doubling and frequency tripling, red and blue light can be further obtained with 1.3 μm laser emission, which has important applications in laser display and medical treatment [4,5]. Compared with continuous-wave operation, the $Q$-switching operation can provide high peak power with a narrow pulse duration in nanosecond scale. Therefore, the $Q$-switched lasers of 1.3 μm have been an interest of scientific research [69]. For instance, Wan et al. described a $Q$-switched 1319 nm laser from diode-side-pumped Nd:YAG crystal, and a maximum average power of 8.9 W of $TEM00$ mode was obtained at the repetition rate of 8 kHz [6]. Zhang et al. reported a high-power diode-side-pumped Nd:YAG laser emitting at 1338 nm, and the average output power at $Q$-switched operation decreased from 70 W at 50 kHz to 55 W at 5 kHz [7].

Qi Bian, Yong Bo, Jun-Wei Zuo, Lei Yuan, Hong-Wei Gao, Qin-Jun Peng. High-power wavelength-tunable and power-ratio-controllable dual-wavelength operation at 1319 nm and 1338 nm in a Q-switched Nd:YAG laser[J]. Photonics Research, 2022, 10(10): 2287