High energy 523 nm ND:YLF pulsed slab laser with novel pump beam waveguide design

• A stable Nd:YLF MOPA green laser system with high pulse energy is demonstrated.
• The maximum pulse energy of 520 mJ at 523 nm was achieved.
• We designed a trapezoid waveguide to couple and homogenize the pump laser.

A laser diode pumped Nd:YLF master oscillator power amplifier (MOPA) green laser system with high pulse energy and high stable output is demonstrated. At a repetition rate of 50 Hz, 840 mJ pulse energy, 9.1 ns pulse width of 1047 nm infrared laser emitting is obtained from the MOPA system. The corresponding peak power is 93 MW. Extra-cavity frequency doubling with a LiB3O5 crystal, pulse energy of 520 mJ at 523 nm wavelength is achieved. The frequency conversion efficiency reaches up to 62%. The output pulse energy instability of the laser system is less than 0.6% for one hour.