Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF2 crystals

Qian Zhang; Liangbi Su; Dapeng Jiang; Fengkai Ma; Zhipeng Qin; Guoqiang Xie; Jiangang Zheng; Qinghua Deng; Wanguo Zheng; Liejia Qian; Jun Xu

doi:10.3788/COL201513.071402

Journals >Chinese Optics Letters >Volume 13 >Issue 7 >Page 071402 > Article

Chinese Optics Letters
Vol. 13, Issue 7, 071402 (2015)

Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF₂ crystals

Qian Zhang^1、4, Liangbi Su^1、*, Dapeng Jiang¹, Fengkai Ma^1、4, Zhipeng Qin², Guoqiang Xie², Jiangang Zheng³, Qinghua Deng³, Wanguo Zheng³, Liejia Qian², and Jun Xu^1、**

Author Affiliations

¹Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China

²Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

³Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

⁴University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/COL201513.071402 Cite this Article Set citation alerts

Qian Zhang, Liangbi Su, Dapeng Jiang, Fengkai Ma, Zhipeng Qin, Guoqiang Xie, Jiangang Zheng, Qinghua Deng, Wanguo Zheng, Liejia Qian, Jun Xu. Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF₂ crystals[J]. Chinese Optics Letters, 2015, 13(7): 071402 Copy Citation Text

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Fig. 1. Room-temperature absorption spectra of (a) the 0.5% Nd:CaF2 crystal, which is 484–1000 nm and (b) the 0.5% Nd, 10% Y:CaF2 crystal, which is 767-835 nm.

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Fig. 2. Room temperature emission spectra of the 0.5% Nd:CaF2 and 0.5% Nd, 10% Y:CaF2 crystals.

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Fig. 3. (a) The room-temperature absorption spectra of the Nd3+I49/2→F45/2+H29/2 transition. (b) The absorption cross section at 790 and 797 nm for x (x=0.4%, 0.5%, 0.6%, 0.8%) Nd, 10% Y:CaF2 crystals.

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Fig. 4. Room-temperature emission spectra of x(x=0.4%,0.5%,0.6%,0.8%) Nd, 10% Y:CaF2 crystals.

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Fig. 5. Schematic of the CW laser setup: LD, laser diode; LS=L=500 mm; OC: output coupler with a transmission of 2%.

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Fig. 6. Laser output power versus absorbed pump power curves for x(x=0.4%,0.5%,0.6%,0.8%) Nd, 10% Y:CaF2 crystals.

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Crystal	$Ω_{2}$ ( $10^{- 20} {cm}^{2}$ )	$Ω_{4}$ ( $10^{- 20} {cm}^{2}$ )	$Ω_{6}$ ( $10^{- 20} {cm}^{2}$ )	$λ_{em}$ (nm)	$Δ λ$ (nm)	$τ_{rad}$ (μs)	$τ_{exp}$ (μs)	$η$ (%)	$σ_{em}$ ( $10^{- 20} {cm}^{2}$ )
$0.5 % Nd : {CaF}_{2}$	1.1082	3.6337	4.3470	1062	33.21	1091	17.99	1.65	2.28
$0.5 % Nd, 10 % Y : {CaF}_{2}$	0.1585	3.2329	3.5231	1054	28.03	657.47	361.27	54.95	4.27

Table 1. Judd–Ofelt Parameters Ω2, Ω4, Ω6, Maximum Emission Peak (λem), FWHM (Δλ), Radiative Emission Lifetime (τrad), Fluorescence Lifetime (τexp), Fluorescence Quantum Efficiency (η) and Maximum Emission Cross Section (σem) for 0.5% Nd:CaF2 and 0.5% Nd, 10% Y:CaF2 Crystals

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Crystal	$Ω_{2}$ ( $10^{- 20} {cm}^{2}$ )	$Ω_{4}$ ( $10^{- 20} {cm}^{2}$ )	$Ω_{6}$ ( $10^{- 20} {cm}^{2}$ )	$λ_{em}$ (nm)	$Δ λ$ (nm)	$τ_{rad}$ (μs)	$τ_{exp}$ (μs)	$η$ (%)	$σ_{em}$ ( $10^{- 20} {cm}^{2}$ )
$0.4 % Nd, 10 % Y : {CaF}_{2}$	0.6077	2.8032	3.0639	1054	29.99	795.09	350.62	46.19	3.36
$0.5 % Nd, 10 % Y : {CaF}_{2}$	0.1585	3.2329	3.5231	1054	28.51	657.47	361.27	54.95	4.27
$0.6 % Nd, 10 % Y : {CaF}_{2}$	0.4121	2.2806	4.0231	1054	28.96	693.22	359.40	51.85	3.99
$0.8 % Nd, 10 % Y : {CaF}_{2}$	0.3477	2.9516	3.5851	1054	29.98	677.26	320.97	47.39	3.94