Phase conjugating mirror combining a fused silica rod and a fiber.
A phase conjugating mirror combining a fused silica rod and an optical fiber is presented. This configuration combines a large diameter fused silica rod with a high laser damage threshold and an optical fiber with a low stimulated Brillouin scattering (SBS) threshold. The composed SBS generator-amplifier construction, similar to the two-cell type makes a forced SBS process, in which the Stokes beam reflected by the fiber is injected into the fused silica rod. Using this combined phase conjugating mirror in a laser-diode-pumped laser master oscillator power amplifier system, we obtained 42% SBS reflectivity at most at 100 Hz repetition rate. At the same time, the inverse beam quality parameter M(2) is reduced from 3 to 1.6, while at 400 Hz repetition rate, M(2) is reduced from 4 to 1.7.
Wang
Sha
S
The State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China.
Chen
Jun
J
Tong
Lixin
L
Gao
Qingsong
Q
Liu
Chong
C
Tang
Chun
C