Passively <i>Q</i>-Switched Pulse Laser with Large Core Size Crystal Waveguide Near Diffraction-Limit Beam Quality Output

Hong Lei; Qi Liu; Yu Wang; Yongling Hui; Zhanda Zhu; Qiang Li

doi:10.3788/AOS202141.1214001

Acta Optica Sinica, Volume. 41, Issue 12, 1214001(2021)

Passively Q-Switched Pulse Laser with Large Core Size Crystal Waveguide Near Diffraction-Limit Beam Quality Output

Hong Lei^1,2,3,4, Qi Liu^1、**, Yu Wang¹, Yongling Hui^1,2,3,4, Zhanda Zhu^1,2,3,4, and Qiang Li^1,2,3,4、*

¹Institute of Laser Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

²Beijing Engineering Research Center of Laser Technology, Beijing 100124, China

³Beijing Colleges and Universities Engineering Research Center of Advanced Laser Manufacturing, Beijing 100124, China

⁴Key Laboratory of Trans-Scale Laser Manufacturing Technology Ministry of Education, Beijing 100124, China

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Fig. 1. Crystal waveguide. (a) Cross-section structure of crystal waveguide; (b) micrograph of crystal waveguide core layer

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Fig. 2. Schematic of passively Q-switched experimental setup

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Fig. 3. Photo of experimental setup

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Fig. 4. Output power of continuous wave and passively Q-switched

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Fig. 5. Output power at different transmission rates

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Fig. 6. Measurement results. (a) Passively Q-switched pulse sequence; (b) passively Q-switched pulse profile

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Fig. 7. Beam quality fitting curve of passively Q-switched

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Table 1. Comparison of refractive index matching core layer thickness and conventional core layer thickness
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Table 1. Comparison of refractive index matching core layer thickness and conventional core layer thickness
Core material Cladding material Refractive index difference Single-mode core layer thickness /μm
1% Yb∶YAG YAG 1.1×10^-4 35
1% Yb∶YAG 0.5% Er∶YAG 4×10^-6 185

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Hong Lei, Qi Liu, Yu Wang, Yongling Hui, Zhanda Zhu, Qiang Li. Passively Q-Switched Pulse Laser with Large Core Size Crystal Waveguide Near Diffraction-Limit Beam Quality Output[J]. Acta Optica Sinica, 2021, 41(12): 1214001

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