Influence of Thermal Lens Effect on Output Energy of Er <sup>3+</sup>, Yb <sup>3+</sup>∶Glass Laser

Qingkun Song; Haibing Li; Yongjun Dong; Dongbing He; Shunguang Li; Suya Feng; Xucheng Wang; Zhengwei Kong; Liang Chen; Qiubai Yang

doi:10.3788/CJL202148.1701002

Chinese Journal of Lasers, Volume. 48, Issue 17, 1701002(2021)

Influence of Thermal Lens Effect on Output Energy of Er ³⁺, Yb ³⁺∶Glass Laser

Qingkun Song^1,2, Haibing Li^1、*, Yongjun Dong³, Dongbing He¹, Shunguang Li¹, Suya Feng¹, Xucheng Wang⁴, Zhengwei Kong⁴, Liang Chen^1,2, and Qiubai Yang¹

Author Affiliations

¹Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³State Key Laboratory for High Laser Field Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

⁴Shanghai Daheng Optics and Fine Mechanics Co., Ltd., Shanghai 201800, China

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Figures & Tables(10)

Fig. 1. Experimental setup for passively Q-switched laser

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Fig. 2. Relationship between output pulse energy and pumping repetition frequency

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Fig. 3. Thermal focal length varying with the pumping repetition frequency of EY1, EY2, and EY3

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Fig. 4. Schematic diagram of resonant cavity structure

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Fig. 5. Variation of spot radius of front cavity with thermal focal length

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Fig. 6. Relationship between output pulse energy and pumping repetition frequency

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Fig. 7. Variation of output power with pumping power

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Table 1. Parameters for thermo-optic coefficient of Er³⁺,Yb³⁺∶glass
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Table 1. Parameters for thermo-optic coefficient of Er³⁺,Yb³⁺∶glass
Er³⁺,Yb³⁺∶glass $\frac{d n_{0}}{d T}$ /(10^-7 K^-1) α_T /(10^-7 K^-1) χ /(10^-7 K^-1)
EY1 -23 87 34.39
EY2 -36 99 29.31
EY3 -47 108 24.25

Table 2. Value of related parameters

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Table 2. Value of related parameters

Parameter	Value	Parameter	Value
ξ	0.8	c_p/[J/(kg·K)]	840
K_c/[W/(m·K)]	0.745	ρ/(kg/m³)	2633
υ	0.24	α/mm^-1	0.573
r_b/mm	1	l/mm	4.018
σ/cm²	0.8×10^-20	σ_es/cm²	1×10²⁰
γ	2	T₀	0.935
v/s^-1	1.95×10¹¹	L	0.05
σ_gs/cm²	3.5×10-19	ω_p/μm	180

Table 3. Variation of output pulse energy with thermo-optical coefficient
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Table 3. Variation of output pulse energy with thermo-optical coefficient
Er³⁺,Yb³⁺∶glass χ/(10^-7 K^-1) Output pulseenergy /μJ
EY1 34.39 323
EY2 29.31 363
EY3 24.25 391

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Qingkun Song, Haibing Li, Yongjun Dong, Dongbing He, Shunguang Li, Suya Feng, Xucheng Wang, Zhengwei Kong, Liang Chen, Qiubai Yang. Influence of Thermal Lens Effect on Output Energy of Er ³⁺, Yb ³⁺∶Glass Laser[J]. Chinese Journal of Lasers, 2021, 48(17): 1701002

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