High-stability and high-beam-quality single-frequency nanosecond 589 nm laser based on sum-frequency generation

1319 nm single-frequency injection seeded Q-switched laser based on ramp-hold-fire

“…One of the main ways to generate 589 nm laser is the sum frequency generation of 1064 nm laser and 1319 nm laser. The main technologies to generate 1319 nm laser with nanosecond pulse duration single-frequency include injection seeded technology [9] and 1319 nm single-frequency continuous wave seed laser external modulation by acousto-optic modulator (AOM) to generate single-frequency nanosecond laser, and then achieve high energy through multi-stage amplification [10][11] . Compared with the injection seeded technology, the output energy of the singlefrequency pulse laser generated by external modulation is micro-joule level.…”