In order to replace multi-stage fiber pre-amplification structure in a master oscillator power amplification structure,a grazing incidence slab laser amplifier with small signal and high gain is simulated and studied experimentally.The thermal conversion coefficient of the slab crystal is measured by an axicon structure caused by the linear temperature gradient in the slab.The results show that the thermal conversion coefficient are 0.37 and0.28 for 0.1 mW and 1 Wseed laser extraction,respectively.When the ...