Abstract
We present our research on the high energy picosecond laser operating at a repetition rate of 1 kHz and the high average power picosecond laser running at 100 kHz based on bulk Nd-doped crystals. With diode-pumped solid state (DPSS) hybrid amplifiers consisting of a picosecond oscillator, a regenerative amplifier, end-pumped single-pass amplifiers, and a side-pumped amplifier, an output energy of 64.8 mJ at a repetition rate of 1 kHz was achieved. An average power of 37.5 W at a repetition rate of 100 kHz pumped by continuous wave laser diodes was obtained. Compact, stable and high power DPSS laser amplifier systems with good beam qualities are excellent picosecond sources for high power optical parametric chirped pulse amplification (OPCPA) and high-efficiency laser processing.
Highlights
High power picosecond lasers have attracted widespread attention due to their wide application in nonlinear frequency conversion, precision processing, and bio-medicine
The picosecond laser system consisted of a picosecond oscillator, a regenerative amplifier, four stages of end-pumped single-pass amplifiers, and a side-pumped amplifier
We have introduced the latest developments in high power diode-pumped solid state (DPSS) picosecond lasers
Summary
High power picosecond lasers have attracted widespread attention due to their wide application in nonlinear frequency conversion, precision processing, and bio-medicine. A 1-kHz-repetition-rate thin-disk regenerative amplifier was reported with a pulse energy of 10 mJ and a pulse duration of 1.29 ps after compression [5,17]. In 2012, using gratings to stretch and compress the pulses, a multi-pulse picosecond laser with 14 mJ and a pulse duration of 28 ps operating at a repetition rate of 1 kHz from a Nd:YVO4 regenerative amplifier was reported [23]. 10.5 W, 14.2 ps pulses at 1064 nm with a repetition rate of 10 kHz from a Nd:YVO4 amplifier system was obtained [25] and an average power of 44.5 W, a pulse duration of 8.8 ps at 100 MHz with an optical efficiency of 56% was achieved from a sapphire face-cooled Nd:YVO4 slab amplifier [26]. Stable, and high power DPSS laser amplifier systems with good beam qualities are excellent picosecond sources for high power OPCPA and high-efficiency laser processing
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