Few-layer SnSe2 was successfully fabricated by liquid phase exfoliation method. A passive Q-switched Tm:YAP laser at the wavelength of 1940 nm was demonstrated by using SnSe2 saturable absorber (SA). Under absorbed pump power of 4.9 W, 400 mW Q-switched was achieved with the pulse width of 1.29 μs and the repetition rate of 109.77 kHz. The results indicate the promising potential of SnSe2 nanosheets as SA to achieve efficient pulsed lasers at around 2 μm.
A diode-pumped nanosecond Master Oscillator Power Amplifier (MOPA) system based on Nd:YLF crystal slabs has been demonstrated. The seed pulses with pulse duration of 11 ns were generated in an EO Q-switched Nd:YLF laser, with single pulse energy of 10 mJ. The 1047 nm signal pulses were amplified in a double-pass amplification system. Maximum output pulse energy of 270 mJ at a repetition rate of 50 Hz has been achieved with effective optical-to-optical efficiency of 14.5%.
A compact diode side-pumped conductively cooled 1047 nm Nd:YLF slab laser with high energy and short pulse width is developed. Through ray tracing method, we design a home-made pump module to homogenize the pump intensity. Based on the Possion equation, a thermal conduct model of side-pump laser is established. The temperature distribution in laser crystal is obtained, and the thermal lens is caculated. With the absorbed pump energy of 818 mJ, the maximum output energy of 228 mJ is achieved in free-running mode. At a repetition rate of 50 Hz, 160 mJ, 9 ns 1047 nm infrared light is obtained under the maximum absorbed pump energy, and the slope efficiency is 27.8%.
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