In this paper,while obtaining the high beam quality laser seeder by the the method of twist mode,compensation of birefringence?design of uniform pump cavity and phase conjugation mirror(PCM) were used to improve the beam quality of MOPA laser system.

LD pumped laser MOPA system with a phase conjugating mirror of a fused silicon rod;

The maximum pulse energy of the MOPA system is 2.

A doublepass configuration of MOPA system is realized by a diode pumped,single longitudinal mode Nd∶YAG master oscillator and three flashlamppumped YAG amplifiers with a phase conjugating stimulatedbrillouinscattering cell.

Amplification of hybrid-widen linewidth of broadband pulses in Nd:glass laser systems

Presenting a laser system generates suitable laser power for use in photodynamic therapy,the laser system generates a red laser at 660nm near the absorbing peak of second-generation photosensitisers,can treat malignant disease fast and efficient with output power greater than 4 watts.

Based on the relative fluctuation C(0) of light intensity and signal-noise ratio (SNR) of the output of the single-mode laser gain system of input signal,the physical value K is defined to describe the overall output of the laser system.