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

A Tm:SrF 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...

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Bibliographic Details
Published in:Optics letters 2022-03, Vol.47 (5), p.1117
Main Authors: Wang, Yangxiao, Liu, Wenxin, Zhang, Zhonghan, Strzep, Adam, Liu, Jie, Chen, Zhenqiang, Ma, Fengkai, Su, Liangbi
Format: Article
Language:English
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Summary:A Tm:SrF 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 Tm ions. A maximum output power of 4.082 W is also obtained. The laser performance indicates that Tm:SrF is a promising candidate for highly efficient ∼2 µm lasers.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.449484