论文部分内容阅读
眼睛损伤过程大都与波长有关(表1)红外波长可划分为IR-A(760nm～1.4μm),IR-B(1.4～3μm)和IR-C(3μm～1mm)。眼睛角膜主要吸收大于1.9μm波长的光。对于1.4～1.9μm的光,角膜和水晶体都能强吸收(图1)。当波长短于1.4μm时,由于光被聚焦到视网膜上,会造成眼睛严重损伤。表1列出了国防部用的眼睛安全的激光工作参数。由表可见,在波长大于1400nm时,激光输出的容许值大大高于红宝石和钕器件输出容许值。用CO_2激光束向角膜曝光1～100ns时间,它的损伤阈值为0.01J/cm~2。若完全根据眼睛安全损伤阈值为安全工作选择激光测距机,并且只采用脉冲激光器的话,那么对Nd:YAG,钬、CO_2和铒激光器的需
The eye damage process is mostly wavelength-dependent (Table 1) The infrared wavelengths can be classified as IR-A (760nm-1.4μm), IR-B (1.4-3μm) and IR-C (3μm-1mm). The cornea of the eye mainly absorbs light with a wavelength of more than 1.9 μm. For 1.4 ~ 1.9μm light, the cornea and crystal are both strongly absorbable (Figure 1). When the wavelength is shorter than 1.4 μm, serious eye damage can occur as the light is focused on the retina. Table 1 lists eye-safe laser operating parameters used by the Department of Defense. As can be seen from the table, at wavelengths greater than 1400 nm, the allowable value of the laser output is much higher than that of ruby and neodymium devices. With CO2 laser beam corneal exposure 1 ~ 100ns time, its damage threshold is 0.01J / cm ~ 2. If the laser range finder is chosen for safety work based entirely on the eye-safety damage threshold and only pulsed lasers are used then the need for Nd: YAG, holmium, CO 2 and erbium lasers