The expansion dynamics of laser-induced plasma (LIP) at front and rear surface of fused silica under 1064 nm nanosecond laser irradiation was investigated with fast photography, shadowgraphy and interferometry. Self-emission images of LIP show that the rear surface plasma (RSP) splits into a fast and a slow component at tens of nanoseconds delay after laser irradiation while the front surface plasma (FSP) does not split. Moreover, the FSP is identified to mainly contain free electrons while the RSP includes ejected neutrals. Thermal emission of superheated neutrals is suggested to be responsible for the generation of slow component.
We demonstrated a Q-switched Nd:LuVO4 laser with fundamental mode at 1064 nm using BaB2O4 electro-optic Q-switching. High-efficiency operation of Q-switched laser with dynamic to static ratio of 91.4% was realized. When the absorbed pump power was 6.59 W, the maximum average output power of 2.88 W was achieved with a repetition rate of 50 kHz. The optical conversion efficiency and slope efficiency were 43.7% and 55.5%, respectively. The minimum pulse width of 17.8 ns was achieved. Meanwhile, the pulse energy and peak power were 57.6 μJ and 3.2 kW, respectively. To the best of our knowledge, this study is the first to demonstrate about the electro-optically Q-switched laser in Nd:LuVO4 crystal.
We report a compact, 130-W single-stage master oscillator power amplifier with a high peak power of 51.3 kW and a narrow spectral linewidth of 0.1 nm. The seed source is a single-mode, passively mode-locked solid-state laser at 1064 nm with an average power of 2 W. At a repetition rate of 73.5 MHz, the pulse duration is 30 ps. After amplification, it stretches to 34.5 ps. The experiment enables the optical-to-optical conversion efficiency to reach 75%. To the best of our knowledge, this is the first report of such a high-power, narrow spectral linewidth, high peak power picosecond-pulse fiber amplifier based on a continuous-wave, mode-locked solid-state seeding laser. No amplified spontaneous emission and stimulated Raman scattering were observed when the pump was increased.
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