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4 March 2022 Disordered Yb:GdYCOB crystal: polarized spectroscopy, thermal lensing and diode-pumped lasers
Lizhen Zhang, Ru-Xue Bai, Haifeng Lin, Pavel Loiko, Xavier Mateos, Zhang-Lang Lin, Zhoubin Lin, Ge Zhang, Valentin Petrov, Li Wang, Weidong Chen
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Proceedings Volume 11980, Solid State Lasers XXXI: Technology and Devices; 119800L (2022) https://doi.org/10.1117/12.2610366
Event: SPIE LASE, 2022, San Francisco, California, United States
Abstract
We report on the Czochralski growth, polarized optical spectroscopy, thermal lensing and diode-pumped laser operation of a Yb3+-doped monoclinic “mixed” calcium rare-earth oxoborate crystal, Gd0.235Y0.672Yb0.093Ca4O(BO3)3 (Yb:GdYCOB). The absorption, stimulated-emission and gain cross-section spectra are determined for light polarizations E || X, Y, Z. The maximum σSE above the zero-phonon line is 0.61 x 10-20 cm2 at 1022.4 nm (for E || X) and the luminescence lifetime of Yb3+ ions is 2.37 ms. The gain spectra of Yb:GdYCOB extend beyond 1.15 μm. The thermal lens is studied for the three principal cuts, X-cut, Y-cut and Z-cut, and it is found to be positive. A continuous-wave diode-pumped X-cut Yb:GdYCOB laser generates 9.27 W at ~1050 nm with a slope efficiency of 68.2%, linear laser polarization E || X and nearly diffraction-limited beam (M2 x,y < 1.16). A continuous wavelength tuning from 1020.9 to 1086.3 nm (a tuning range of ~65 nm) is achieved for the Z-cut crystal and the laser polarization E || X.
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Lizhen Zhang, Ru-Xue Bai, Haifeng Lin, Pavel Loiko, Xavier Mateos, Zhang-Lang Lin, Zhoubin Lin, Ge Zhang, Valentin Petrov, Li Wang, and Weidong Chen "Disordered Yb:GdYCOB crystal: polarized spectroscopy, thermal lensing and diode-pumped lasers", Proc. SPIE 11980, Solid State Lasers XXXI: Technology and Devices, 119800L (4 March 2022); https://doi.org/10.1117/12.2610366
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KEYWORDS
Laser crystals
Ytterbium
Polarization
Continuous wave operation
Spectroscopy
Thermal effects
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