High-power high-repetition-rate Nd:YAG nanosecond slab laser amplifier

Abstract

We propose a high-power, high-repetition-rate nanosecond slab laser amplifier that can operate at room temperature. The laser seed source uses a self-developed nanosecond laser with 500 W and 1064 nm. Based on the principle of multi-angle amplification of Nd:YAG slab structure, the seed source is injected into the Nd:YAG slab crystal at an incident angle of 10.2° and 20.6° after passing through the isolation system, the collimation system and the beam shaping system in turn. The rectangular output spot greatly improves the cleaning efficiency. The seed source operates in pulse mode, and the pump source of the amplifier operates in quasi-continuous mode. The pump uses a single side pump source with a wavelength of 808 nm and a bar number of 60 × 8. When the pulse width, repetition frequency and current of the pump are set to 200 μs, 400 Hz and 120 A, respectively, the output power of the seed source through the amplifier is 521 W and the magnification is 6 times. The output power of the seed source secondary through the amplifier is 872 W, and the magnification is as high as 19 times. When the pump pulse width, repetition rate and current are 400 μs, 400 Hz and 120 A, respectively, the output power of the seed source passing through the slab crystal twice is as high as 1747 W. The nanosecond slab laser amplifier with rectangular output spot designed by us can be applied to the field of high-efficiency laser cleaning.