High Power Quasi-continuous-wave Solid-state Slab

Abstract

An all-solid-state quasi-continuous-wave (QCW) Nd:YAG slab laser with a high power was demonstrated. A Nd:YAG slab crystal is adopted for gain medium, a plane-concave cavity is set up, and the laser beam travels along a Zigzag path in the slab. An average output power of 3 420 W is obtained at a pump power of 9 kW, corresponding to a repetition rate of 1 kHz. The pulse width is 80 μs with a pulse energy of 3. 42 J, and the laser beam quality with AO system β is 4. 1 times of the diffraction limit.