我们采用自行设计研制的积分球，测量了几种不同表面状况的ＬＹ１２铝合金靶对ＣＷＣＯ２激光（功率４０Ｗ左右）的热耦合系数。与理想条件下的经典理论值相比，热耦合系数的测量值偏大，文中对此进行了分析。结果表明，材料的表面缺陷将增强对入射激光的热耦合 We use self-designed integrating sphere to measure the thermal coupling coefficient of several LY12 aluminum alloy targets with different surface conditions to CWCO2 laser (about 40W). Compared with the classical theoretical value under the ideal condition, the measured value of the thermal coupling coefficient is too large, which is analyzed in the article. The results show that the surface defects of the material will enhance the thermal coupling to the incident laser