High pulse repetition rate double-pass amplifier with the liquid phase conjugating mirror

Phase conjugation technology with liquid CH3COCH3 as medium to improve beam quality in double-pass amplifier laser system is experimentally investigated. The results operating at 400 Hz repetition rate show that the thermal effects of the liquid medium can be effectively reduced when the beam scanning system is adopted. A maximum SBS reflectivity of 65% by using liquid CH3COCH3 is achieved at 400 Hz. In addition, the pulse width of laser has been compressed to 5 ns, and the beam quality has been improved.