Laser performances of diode pumped Yb:Lu.sub.2./sub.O.sub.3./sub. transparent ceramic at cryogenic temperatures

0518033 - FZÚ 2020 RIV US eng J - Journal Article
David, Samuel Paul - Jambunathan, Venkatesan - Yue, Fangxin - Le Garrec, Bruno - Lucianetti, Antonio - Mocek, Tomáš
Laser performances of diode pumped Yb:Lu₂O₃ transparent ceramic at cryogenic temperatures.
Optical Materials Express. Roč. 9, č. 12 (2019), s. 4669-4676. ISSN 2159-3930
R&D Projects: GA MŠMT EF15_006/0000674; GA MŠMT LO1602
EU Projects: European Commission(XE) 739573 - HiLASE CoE
Grant - others:OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institutional support: RVO:68378271
Keywords : cryogenic temperature * Yb:Lu₂O₃
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.064, year: 2019
Method of publishing: Limited access
https://doi.org/10.1364/ome.9.004669

Two different fiber coupled diode pump sources, one emitting around 975.7 nm volume Bragg grating (VBG) stabilized and another around 940 nm were used for comparison. Under the pump at 975.7 nm and 100 K cryogenic temperature, the laser yielded CW output power of 11.24 W for 20.3 W incident pump power, corresponding to an overall optical-to optical efficiency of 55%, the slope efficiency was 59%. For operation at room temperature, the output power was limited to 4.44 W whereas the slope efficiency was 27.5%. Optimum operation under 940 nm pump was obtained at 80 K. Under 940 nm pumping, Yb:Lu2O3 medium generated a CW output power of 3 W for 20 W, the slope efficiency was around 17%. The passive Q-switch operation was investigated with Cr4+:YAG saturable absorber (SA) crystal, employing the pump at 975.7 nm. Laser pulses with an energy of 0.35 mJ and a pulse duration of 116 ns at 26.1 kHz repetition rate were recorded with a Cr4+:YAG SA having 85% initial transmission.

Permanent Link: http://hdl.handle.net/11104/0303236