Effect of intense and prolonged 248 nm pulsed‐laser irradiation on the properties of ultraviolet‐grade fused silica
Effect of intense and prolonged 248 nm pulsed‐laser irradiation on the properties of ultraviolet‐grade fused silica
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强而长时间的 248 nm 脉冲激光照射对紫外级熔融石英性能的影响
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发表时间：
1991
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影响因子：
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通讯作者：
A. Tam
中科院分区：
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作者：
W. Leung;M. V. Kulkarni;D. Krajnovich;A. Tam
我们研究了各种高纯度“UV 级”熔融石英样品在 KrF 准分子激光以 400 mJ/cm2、300 Hz 和总共 6000 万个脉冲照射期间的吸收、温度、紫外 (UV) 光谱、双折射和表面轮廓的变化。所有样品的光谱和物理特性都表现出永久且不可逆的变化。一些样品在辐照过程中表现出部分“自退火”行为，其中吸收首先增加到~10%/cm的峰值，然后减少并稳定在较低值。这可能表明新的稳定状态的形成。辐射引起的效应受到激光重复率、退火和样品环境温度的显着影响。为了进行比较，在类似条件下测试了结晶石英，发现辐射基本上没有改变。
We have studied changes in the absorption, temperature, ultraviolet (UV) spectrum, birefringence, and surface profile of various high‐purity ‘‘UV‐grade’’ fused silica samples during KrF excimer laser irradiation at 400 mJ/cm2 and 300 Hz and up to a total of 60 million pulses. All samples exhibit permanent and irreversible changes in the spectroscopic and physical properties. Some samples show a partial ‘‘self‐annealing’’ behavior during the irradiation in which the absorption first increases to a peak value of ∼10%/cm, and then decreases and levels off at a lower value. This may indicate the formation of a new stable state. The radiation‐induced effects are significantly affected by the laser repetition rate, annealing, and ambient temperature of the sample. For comparison, crystalline quartz is tested under similar conditions, and is found to be essentially unchanged by the radiation.