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21 February 2020 Growth, spectroscopy and laser operation of Yb3+, Na+/Li+-codoped CNGG-type garnets promising for ultrafast lasers
Zhongben Pan, Pavel Loiko, Josep Maria Serres, Hualei Yuan, Xiaojun Dai, Huaqiang Cai, Magdalena Aguiló, Francesc Díaz, Patrice Camy, Yicheng Wang, Uwe Griebner, Valentin Petrov, Xavier Mateos
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Proceedings Volume 11259, Solid State Lasers XXIX: Technology and Devices; 1125911 (2020) https://doi.org/10.1117/12.2545933
Event: SPIE LASE, 2020, San Francisco, California, United States
Abstract
Rare-earth-doped calcium niobium gallium garnets (Ca3Nb1.5Ga3.5O12, shortly CNGG) are disordered laser materials attractive for ultrashort pulse generation. We report on the crystal growth by the Czochralski method, spectroscopy and efficient laser operation of Yb3+,Na+ and Yb3+,Na+,Li+-codoped CNGG-type crystals. Their cubic structure is confirmed by X-ray diffraction and Raman spectroscopy. The absorption / stimulated-emission cross-sections and lifetime of Yb3+ are determined. Continuous-wave (CW) laser experiments are performed in a compact cavity using a 968-nm InGaAs pump laser diode. A 11.9 at.% Yb,Na:CNGG crystal generated 3.74 W at 1069.9 nm with a slope efficiency of 56.5%. Yb,Na:CNGG is promising for sub-100-fs mode-locked lasers at ~1 μm.
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Zhongben Pan, Pavel Loiko, Josep Maria Serres, Hualei Yuan, Xiaojun Dai, Huaqiang Cai, Magdalena Aguiló, Francesc Díaz, Patrice Camy, Yicheng Wang, Uwe Griebner, Valentin Petrov, and Xavier Mateos "Growth, spectroscopy and laser operation of Yb3+, Na+/Li+-codoped CNGG-type garnets promising for ultrafast lasers", Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125911 (21 February 2020); https://doi.org/10.1117/12.2545933
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KEYWORDS
Crystals
Ytterbium
Spectroscopy
Laser crystals
Garnet
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