Abstract
We have demonstrated a high pulse energy and high optic–optic efficiency double-pass picosecond (ps) master oscillator power amplifier system of 1064 nm at a pulse repetition rate of 500 kHz. A 500 kHz, 7.68 μJ picosecond laser is used as the seed laser. Through one stage double-pass traveling-wave amplifier, a maximum output power of 16.19 W at a pump power of 31.7 W is generated with the optic–optic efficiency of 51.07%. The output pulse duration is 17.6 ps, corresponding to the pulse energy of 32.38 μJ. The beam quality factor M 2 were measured to be 1.28 and 1.17 along the x, y axis direction, respectively.
Highlights
Due to the obvious advantages in research and industrial fields [1,2,3,4] in recent years, much work has been dedicated to high-power, high-repetition-rate picosecond lasers, especially those with good beam quality, narrow pulse width
We demonstrate a highly stable and high beam quality industrial grade double-pass picosecond Nd:YVO4 amplifier with repetition rate of 500 kHz
A MOPA system that consisted of a ps mode-locked oscillator, a four-pass
Summary
Due to the obvious advantages in research and industrial fields [1,2,3,4] in recent years, much work has been dedicated to high-power, high-repetition-rate picosecond lasers, especially those with good beam quality, narrow pulse width. Compared with the Q-switched method, the direct-modulated semiconductor diode is more suitable as the master oscillator, because of its abilities of high pulse repetition frequency (PRF). Nd:YVO4 crystals as a gain material with sufficient gain bandwidth and a high emission cross section are widely adopted in end-pumping picosecond regenerative amplifiers. It has larger stimulated emission of radiation at 1.06 μm, which is about five times as large as that of Nd:YAG. The absorption bandwidth around 808 nm is about five times as much as that of Nd:YAG, and the absorption coefficient is so large that it is conductive for LD (Laser Diode) pumped [9,10]. Existing experiments show that Nd:YVO4 is a kind of laser crystal with low threshold and high efficiency
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