Vincelette Rebecca L, Thomas Robert J, Rockwell Benjamin A, Clark Clifton D, Welch Ashley J
University of Texas at Austin, Department of Biomedical Engineering, Cockrell School of Engineering, Austin, TX 78712, USA.
J Opt Soc Am A Opt Image Sci Vis. 2009 Mar;26(3):548-58. doi: 10.1364/josaa.26.000548.
An ABCD beam-propagation method was used to build a first-order mathematical model of a thermal lens effect from a near-infrared laser beam in water and ocular media. The model was found to fit experimental z-scan data best when the thermo-optic coefficient dn/dT of liquid water at 292 K was -4.46x10(-5) K(-1). The physiological parameters of the human eye were simulated in a simple eye model using this fitted dn/dT value. Conservative model simulations for 1150 and 1318 nm laser radiation include parameter sets used in experimental ocular exposures performed by Zuclich et al. [Health Phys.92, 15 (2007)] to illustrate the transient response of the thermal lens approaching the limits of the retinal damage thresholds for equivalent laser radiation sources.
采用ABCD光束传播法建立了近红外激光束在水和眼内介质中热透镜效应的一阶数学模型。当292K液态水的热光系数dn/dT为-4.46×10^(-5)K^(-1)时，该模型被发现与实验z扫描数据拟合得最好。使用该拟合的dn/dT值在一个简单眼模型中模拟了人眼的生理参数。针对1150和1318nm激光辐射的保守模型模拟包括Zuclich等人[《健康物理学》92, 15 (2007)]在实验性眼部照射中使用的参数集，以说明热透镜的瞬态响应接近等效激光辐射源视网膜损伤阈值的极限。
