摘要
用有限Ｈａｎｋｅｌ积分变换法对轴对称强激光束辐照下平面薄靶（或薄膜）传热及热应力分布进行了解析推导，得到了随时间演变的温度场及相应的热应力场的解析解。对比有关实验，对强激光束辐照窗口材料（例如ＭｇＦ２晶体、Ｋ９玻璃）靶引起其脆性热应力破裂进行了分析，详细讨论了激光强度、激光－靶能量耦合系数、辐照时间及光斑尺寸等因素对靶的破坏的影响。
An analytical model for laser-induced heating,heat conduction and thermal stress crack of a brittle thin target is proposed.The analytical expressions are induced for the temperature increment and thermal stress that varies with time,which can be discribed as ηI0b2 /Kh and αEηI0b2/Kh,respectively,while their space-time distributions being expressed as a infinite series.The threshold laser parameters for thermal stress crack of K9 glass and MgF2 ploycrystal targets predicted by this model are in agreement with those obtained experimently.
出处
《强激光与粒子束》
EI
CAS
CSCD
1996年第4期595-601,共7页
High Power Laser and Particle Beams
基金
国家高技术激光技术领域资助
关键词
窗口材料
热传导
激光辐照
optical window material,heat conduction,brittle thermal stress crack,analytical solution
