不同功率密度的高功率激光与材料相互作用时将发生激光支持燃烧波或激光支持爆轰波的现象。为了获得激光支持爆轰波的点燃阈值，采用了波长为1064nm的激光作用在铝靶表面，产生的等离子体声波的峰值声压与作用激光功率密度间存在跃变阶段，并进行了理论分析和实验验证，取得了激光支持爆轰波的点燃阈值，与采用其它方法得到的结果基本吻合。实验结果对了解激光与物质相互作用机理和过程是有帮助的。

Based on the phenomena of laser supported combustion or detonation wave induced by the interaction between the high-intensity laser and material,a new method is present for diagnosing the ignition threshold of laser supported detonation wave by measuring the jump of the sound peak pressure of laser-target plasma. The ignition threshold can be obtained by analyzing the jump stage between laser power density and the sound peak pressure of laser-target plasma,which generates on the surface of target due to interaction between Nd∶YAG laser whose wavelength is 1064nm and aluminum target. The test results are largely in accord with those form other methods. The experiment result is helpful to understand the mechanism and process of the interaction between the laser and the matter.