Fig. 1. Schematic of the QPM single-pass frequency-doubled Tm-fiber MOPA at 962.5 nm

Fig. 2. 962.5 nm second harmonic power and conversion efficiency as functions of 1 925nm fundamental power with ξ=2.80

Fig. 3. Theoretical and experimental normalized SHG efficiency as functions of crystal temperature with ξ=2.80

Fig. 4. M² measurement and the single-longitudinal-mode operation of the 962.5 nm second-harmonic（Inset is the beam profile)