Cryogenic Yb:YGAG ceramic laser pumped at 940 nm and zero-phonon-line: a comparative study

0480896 - FZÚ 2018 RIV US eng J - Journal Article
Jambunathan, Venkatesan - Navrátil, Petr - Miura, Taisuke - Yue, Fangxin - Endo, Akira - Lucianetti, Antonio - Mocek, Tomáš
Cryogenic Yb:YGAG ceramic laser pumped at 940 nm and zero-phonon-line: a comparative study.
Optical Materials Express. Roč. 7, č. 2 (2017), s. 477-483. ISSN 2159-3930
R&D Projects: GA MŠMT LO1602; GA MŠMT LM2015086; GA ČR GA14-01660S
Institutional support: RVO:68378271
Keywords : solid-state lasers * high average * Yb-YAG * temperatures
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.566, year: 2017

We present a comparative study on a continuous-wave laser operation of Yb-doped Y3Ga2Al3O12 (Yb:YGAG) ceramic at cryogenic temperatures with conventional pumping (940 nm) and zero phonon line pumping (969 nm) under identical experimental conditions. In CW laser operation, at 80 K with ZPL pumping, a maximum output power of 6.53 W with a slope efficiency of 52.0% is achieved with respect to incident power. When compared between two pump sources at cryogenic temperatures, ZPL pumping performs better due to the difference of quantum defect between the two pump sources that results in different heat load in the sample. In passive Q-switching experiment, at 100 K, with 85% initial transmission of Cr:YAG, an average output power of 3.37 W with a repetition rate of 17.6 kHz was achieved.

Permanent Link: http://hdl.handle.net/11104/0276561