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为了评价用Nd:YAG激光器的安全性和对眼内损伤的可能性,就得了解生物组织吸收高功率激光后所发生的机理。为此,Nd:YAG激光器的功率密度必须超过水的击穿阈值(一般1—3×10~(10)W/cm~2)。可以认为大多数生物组织是一种单相含水系统。曾用1×10~(12)～1.6×10~(12)W/cm~2功率密度的Nd:YAG激光在生物组织感应汽化,但必须注意汽化和声波产生主要与能量吸收有关。如果功率密度远远超过汽化所需要的阈值,那末所生成的蒸气中的压力和温度也随之按比例提高。
In order to evaluate the safety of Nd: YAG lasers and the potential for damage to the eye, it is important to understand the mechanism by which biological tissues absorb high-power lasers. For this reason, the power density of Nd: YAG lasers must exceed the breakdown threshold of water (typically 1-3 × 10 ~ (10) W / cm ~ 2). Most biological tissues can be considered as a single-phase aqueous system. Nd: YAG laser, which used to have a power density of 1 × 10 ~ (12) ~ 1.6 × 10 ~ (12) W / cm ~ 2, has been induced to vaporize in biological tissues, but it must be noted that vaporization and sound wave production are mainly related to energy absorption. If the power density far exceeds the threshold required for vaporization, then the pressure and temperature in the resulting vapor increase proportionally.