Chinese Journal of Lasers, Volume. 50, Issue 23, 2301007(2023)
Growth, Structure, Spectroscopy, and Laser Performance of Nd∶GSAG Crystals
Figures & Tables(14)
Fig. 1. Nd∶GSAG crystal with doping atomic fraction of 0.94% grown by Czochralski method. (a) Before annealing; (b) after annealing
Fig. 3. Single crystal swing curve of Nd∶GSAG crystal with doping atomic fraction of 0.94%
Fig. 4. X-ray powder diffraction pattern of Nd∶GSAG crystal with doping atomic fraction of 0.94% and GSAG standard pattern ICSD 78052
Fig. 5. Full spectrum fitting of Nd∶GSAG crystal with doping atomic fraction of 0.94%
Fig. 6. Transmission and absorption spectra of Nd∶GSAG crystal with doping atomic fraction of 0.94%. (a) Transmission spectra; (b) absorption spectra
Fig. 7. Emission spectra of Nd∶GSAG crystals and Nd∶YAG crystals. (a) 900‒1400 nm; (b) 1045‒1085 nm
Fig. 8. Fluorescence lifetime decay curves of laser upper level 4F3/2. (a) Nd∶GSAG; (b) Nd∶YAG
Fig. 9. Laser output wavelengths of Nd∶GSAG crystal with doping atomic fraction of 0.94% and Nd∶YAG crystal with doping atomic fraction of 0.6% under different output mirrors. (a) M2; (b) M1
Fig. 10. Laser output powers of Nd∶GSAG crystal with doping atomic fraction of 0.94% and Nd∶YAG crystal with doping atomic fraction of 0.6%
Fig. 11. Beam diameter versus d for lasers with different wavelengths. (a) 942 nm; (b) 946 nm; (c) 1060 nm; (d) 1064 nm
Table 1. Absorption characteristic parameters of Nd∶GSAG crystals and Nd∶YAG crystals
View tableTable 1. Absorption characteristic parameters of Nd∶GSAG crystals and Nd∶YAG crystals
Crystal Wavelength /nm Transmittance /% Absorption coefficient /cm-1 Absorption cross-section /（10-20 cm2） FWHM /nm Nd∶YAG 808.4 49.19 3.56 4.30 2.79 0.94% Nd∶GSAG 808.5 46.52 3.79 3.41 3.23 1.20% Nd∶GSAG 808.5 38.95 4.97 3.50 3.28
Table 2. Laser experimental performance parameters of Nd∶GSAG crystal with doping atomic fraction of 0.94% and Nd∶YAG crystal with doping atomic fraction of 0.6%
View tableTable 2. Laser experimental performance parameters of Nd∶GSAG crystal with doping atomic fraction of 0.94% and Nd∶YAG crystal with doping atomic fraction of 0.6%
Crystal Transition Wavelength / nm Fluorescence branching ratio Emission cross-section / （ 10-20 cm2）Laser threshold / W Slope efficiency / % Maximum power / W Light conversion efficiency / % Pump light absorptance in crystal / % Nd∶GSAG 4F3/2→4I9/2 942 0.40 2.33 3.06 5.5 0.66 4.2 68‒83 Nd∶YAG 946 0.37 1.95 5.56 5.0 0.56 3.2 68‒89 Nd∶GSAG 4F3/2→4I11/2 1060 0.49 5.62 0.42 28.4 2.17 24.9 66‒79 Nd∶YAG 1064 0.56 14.22 0.25 28.5 2.26 26.4 66‒76
Table 3. Fitting results of beam quality
View tableTable 3. Fitting results of beam quality
Crystal Wavelength /nm FWHM of laser spectrum /nm Direction Beam quality factor Beam divergence angle /rad Girdle diameter /mm Nd∶GSAG 942 0.53 Horizontal 2.72 0.03155 0.1048 Vertical 3.45 0.03491 0.1185 1060 0.59 Horizontal 2.49 0.03029 0.1111 Vertical 2.63 0.03155 0.1122 Nd∶YAG 946 0.66 Horizontal 3.81 0.03335 0.1375 Vertical 3.73 0.03018 0.1488 1064 0.64 Horizontal 3.16 0.03295 0.1300 Vertical 2.71 0.03129 0.1172
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Lei Huang, Qingli Zhang, Jianqiao Luo, Wenpeng Liu, Junrui Zhang, Renqin Dou, Guihua Sun, Cong Quan, Yingying Chen, Shoujun Ding, Yao Liu, Ying Fan. Growth, Structure, Spectroscopy, and Laser Performance of Nd∶GSAG Crystals[J]. Chinese Journal of Lasers, 2023, 50(23): 2301007
Paper Information
Category: laser devices and laser physics
Received: Mar. 30, 2023
Accepted: Apr. 19, 2023
Published Online: Dec. 7, 2023
The Author Email: Zhang Qingli (zql@aiofm.ac.cn)
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