138 mJ 100 Hz 1030 nm nanosecond laser from compact Yb:YAG amplifiers using cascaded large aspect ratio slabs
摘要
A compact high-energy nanosecond (ns) slab Yb:YAG Master Oscillator Power-Amplifier (MOPA) laser system with high beam quality is proposed and demonstrated. The MOPA system consists of a Q-switched rod Yb:YAG oscillator and two cascaded large aspect ratio slab (CLARS) Yb:YAG amplifiers. The oscillator delivers a pulse energy of 2.4 mJ at a pulse repetition rate (PRR) of 100 Hz, with a pulse duration of 52 ns. The seed pulse is then amplified to 138 mJ with a gain factor of 57.5. The experimental data is in good agreement with the numerical simulation. The average beam quality factor β is 1.62. This laser system is applicable in scientific and industrial fields. The layout area of the entire system is only 900 mm × 450 mm.