Yuanhao Zhao, Qianqian Hao, Zhen Zhang, Jiahao Dong, Luyang Tong, Jingjing Liu, Lina Zhao, Jie Liu, Liangbi Su, "Passively mode-locked Tm, La:CaF2 crystal lasers near 1.9 µm water absorption band," Chin. Opt. Lett. 23, 011401 (2025)

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- Chinese Optics Letters
- Vol. 23, Issue 1, 011401 (2025)

Fig. 1. Schematic of the CW and CWML Tm,La:CaF2 lasers.

Fig. 2. Average output power as a function of the pump power.

Fig. 3. (a) Laser emission spectra of CW and CWML Tm,La:CaF2 lasers. (b) Intensity autocorrelation trace.

Fig. 4. M2 factors of the CWML laser. The inset shows the measured beam profile and 3D intensity distribution.

Fig. 5. (a) Temporal traces of CWML Tm, La:CaF2 pulses in different time scales. RFS in stabilized single-pulse regime: (b) fundamental beat note, RBW = 300 Hz; (c) its harmonics in 1 GHz frequency windows, RBW = 30 kHz. RBW: resolution bandwidth.

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