Research on Laser Mode Matching Based on Gradiently-Doped Crystal

Zhaoyang Man; Can Cui; Yulei Wang; Fuhan Liu; Yindong Li; Zhenxu Bai; Lü Zhiwei

doi:10.3788/CJL230931

Chinese Journal of Lasers, Volume. 51, Issue 5, 0501001(2024)

Research on Laser Mode Matching Based on Gradiently-Doped Crystal

Zhaoyang Man^1,2, Can Cui^1,2、*, Yulei Wang^1,2、**, Fuhan Liu^1,2, Yindong Li^1,2, Zhenxu Bai^1,2, and Lü Zhiwei^1,2

Author Affiliations

¹Center for Advanced Laser Technology, Hebei University of Technology, Tianjin 300401, China

²Hebei Key Laboratory of Advanced Laser Technology and Equipment, Tianjin 300401, China

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Figures & Tables(14)

Fig. 1. Absorption efficiency distributions of gradiently-doped and uniformly-doped crystals

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Fig. 2. Thermal focal lengths of gradiently-doped and uniformly-doped crystals versus pump beam waist position. (a) $M^{2}$ =10; (b) $M^{2}$ =50; (c) $M^{2}$ =100

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Fig. 3. Fundamental mode beam waist radius for gradiently-doped and uniformly-doped crystals versus pump beam waist position. (a) $M^{2}$ =10; (b) $M^{2}$ =50; (c) $M^{2}$ =100

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Fig. 4. Effective mode volume versus pump beam waist position. (a) $M^{2}$ =10; (b) $M^{2}$ =50; (c) $M^{2}$ =100

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Fig. 5. Mode matching efficiency versus pump beam waist position. (a) $M^{2}$ =10, $ω_{p 0}$ =0.4 mm; (b) $M^{2}$ =10, $ω_{p 0}$ =0.5 mm; (c) $M^{2}$ =50, $ω_{p 0}$ =0.4 mm; (d) $M^{2}$ =50, $ω_{p 0}$ =0.5 mm; (e) $M^{2}$ =100, $ω_{p 0}$ =0.4 mm; (f) $M^{2}$ =100, $ω_{p 0}$ =0.5 mm

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Fig. 6. Relationship between fundamental mode radius and pump beam waist position. (a) $M^{2}$ =10, $ω_{p 0}$ =0.4 mm; (b) $M^{2}$ =50, $ω_{p 0}$ =0.4 mm; (c) $M^{2}$ =100, $ω_{p 0}$ =0.4 mm

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Fig. 7. Variation of fundamental mode in resonant cavity

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Fig. 8. Experimental setup

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Fig. 9. Schematics of pump beam waist position. (a) Beam waist is located at incident end face of crystal; (b) beam waist is located at output end face of crystal

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Fig. 10. Output power versus incident pump power. (a) $ω_{p 0}$ =0.4 mm, and pump beam waist position is close to crystal input face; (b) $ω_{p 0}$ =0.4 mm, and pump beam waist position is close to crystal output face; (c) $ω_{p 0}$ =0.5 mm, and pump beam waist position is close to crystal input face; (d) $ω_{p 0}$ =0.5 mm, and pump beam waist position is close to crystal output side

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Fig. 11. Longitudinal temperature distributions of crystals. (a) Uniformly-doped crystal with pump beam waist located at incident end face of crystal; (b) uniformly-doped crystal with pump beam waist located at output end face of crystal; (c) gradiently-doped crystal with pump beam waist located at incident end face of crystal; (d) gradiently-doped crystal with pump beam waist located at output end face of crystal

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Fig. 12. Output power versus incident pump power when crystal is located at center of resonator

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Fig. 13. Output power versus incident pump power when crystal is tightly attached to input mirror

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Table 1. Crystal parameters
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Table 1. Crystal parameters
Crystal type Atomic fraction of doped Nd Length
Uniformly-doped crystal 0.3% 24 mm
Gradiently-doped crystal 0.1%+0.2%+0.8% 9 mm+10 mm+5 mm

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Zhaoyang Man, Can Cui, Yulei Wang, Fuhan Liu, Yindong Li, Zhenxu Bai, Lü Zhiwei. Research on Laser Mode Matching Based on Gradiently-Doped Crystal[J]. Chinese Journal of Lasers, 2024, 51(5): 0501001

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