High-efficiency 2.3 µm Tm:YLF laser based on 0.79 µm and 1.05 µm dual-wavelength pumping scheme

Author:

Zhou Xue,Li Jiatong,Huang Shengjun,Sun Qijia,Nie Hongkun,Li Tao,Zhang Baitao,He Jingliang,Yang KejianORCID

Abstract

A high-efficiency Tm:YLF laser at 2.3 µm is demonstrated based on a dual-wavelength pumping scheme with 790 nm LD and a tunable Yb:CALGO laser at around 1.05 µm. When employing single-wavelength pumping at 790 nm, a maximum output power of 3.1 W is obtained, while the maximum output powers of 0.35 W and 0.25 W are achieved for single-wavelength up-conversion pumping at 1055 nm and 1041 nm, respectively. By using 790 nm and 1055 nm dual-wavelength pumping regime, the maximum output power is enhanced to be 3.52 W, which is the highest output power ever achieved from the 2.3 µm Tm:YLF lasers, to the best of our knowledge. The output power of 3.52 W achieved by dual-wavelength pumping exceeds the sum of output powers obtained with the separate single-wavelength pumping at 790 nm and 1055 nm, which well shows that the ground state absorption process 3H63H4 under intense 790 nm pumping would induce a significant accumulation of Tm3+ ions on metastable level 3F4 via cross-relaxation process, greatly promoting the excited-state absorption process 3F43F2,3 and enhancing the 2.3 µm radiation.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Distinguished Young Scholars from Shandong University

Publisher

Optica Publishing Group

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