Laser-diode-pumped Tm:SrF2 single crystal for high efficiency CW laser operation at ~2 µm

A Tm:SrF2 single crystal is grown by a modified temperature gradient technique (TGT). A study of the fluorescence characteristics and laser performance is carried out. Under laser-diode (LD) end-pumping, a continuous-wave (CW) laser is demonstrated. A slope efficiency of up to 81.8% is first achieve...

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Veröffentlicht in:	Optics letters 2022-03, Vol.47 (5), p.1117-1120
Hauptverfasser:	Wang, Yangxiao, Liu, Wenxin, Zhang, Zhonghan, Strzep, Adam, Liu, Jie, Chen, Zhenqiang, Ma, Fengkai, Su, Liangbi
Format:	Artikel
Sprache:	eng
Schlagworte:	Continuous radiation Cross relaxation Crystal growth Efficiency Fluorescence Laser pumping Lasers Photons Quantum efficiency Semiconductor lasers Single crystals Strontium fluorides
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Zusammenfassung:	A Tm:SrF2 single crystal is grown by a modified temperature gradient technique (TGT). A study of the fluorescence characteristics and laser performance is carried out. Under laser-diode (LD) end-pumping, a continuous-wave (CW) laser is demonstrated. A slope efficiency of up to 81.8% is first achieved in the Tm-doped single crystals, which is extremely close to the photon quantum efficiency of 2.00. Such a high photon quantum efficiency is caused by the effective cross-relaxation process between Tm3+ ions. A maximum output power of 4.082 W is also obtained. The laser performance indicates that Tm:SrF2 is a promising candidate for highly efficient ~2 µm lasers.
ISSN:	0146-9592 1539-4794
DOI:	10.1364/OL.449484