Abstract
A high-energy high optic-optic efficiency 808-nm diode-end-pumped 1064-nm Nd:YVO4 picosecond master oscillator laser was demonstrated, and a 3×3×7 mm Nd:YVO4 crystal with a doped concentration of 0.5% was adopted. A maximum output power of 3.39 W was obtained with a pulse width of 16.3 ps and a repetition rate of 29.36 MHz under a pump power of 8.92 W, corresponding to an optic-optic efficiency of 38.0%. Compared to the previously reported picosecond master oscillator solid-state lasers, the optic-optic conversion efficiency of 38% is in the leading level among the reported lasers.
Highlights
High-power, high-energy picosecond pulses are obtained by amplifying a seed laser using cascaded power amplification stages; the overall stability of the laser will decrease across the amplification series
The laser used a two-stage power amplification system with an 888-nm LD end-pumped Nd:YVO4 crystal to amplify the oscillator power to 44 W; the optic-optic conversion efficiency of the amplification system was higher than 25%, and the beam quality factor was smaller than 1.5
Through a theoretical calculation and experimental study, a high-energy highefficiency picosecond laser based on an 808-nm LD pumped Nd:YVO4 was reported
Summary
Since the 1990s, picosecond lasers have been widely used for a variety of applications, such as basic science research, plasma generation, micro-processing, optical communication and molecular reaction dynamics, because of their narrow pulse width, wide spectral bandwidth, high repetition rate and other excellent features.[1,2,3,4] Usually, high-power, high-energy picosecond pulses are obtained by amplifying a seed laser using cascaded power amplification stages; the overall stability of the laser will decrease across the amplification series. In 2011, Fang-Qin Li9 reported a laser structure with a pulse width of 29.2 ps, an average output power of 2.3 W, and a repetition rate of 76 MHz. The Nd:YVO4 crystal was directly pumped by an 880-nm LD to obtain a 1342-nm laser output with an optic-optic conversion efficiency of 19% and a slope efficiency of 23.9%. In 2013, a picosecond oscillator with a pulse width of 45 ps, a maximum output power of 15 W, and a repetition rate of 63 MHz was reported.[10] Nd:YVO4 was pumped using an 888-nm LD to obtain a 1064-nm near-infrared laser; the optic-optic efficiency was 24%. Mode-locked power of 3.39 W was obtained with a repetition rate of 29.36 MHz and a pulse width of 16.3 ps; the optic-to-optic conversion efficiency was 38%, and the beam quality values in the x and y directions were 1.14 and 1.07, respectively
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