Beam displacement as a function of temperature and turbulence length scale at two different laser radiation wavelengths.
Beam displacement as a function of temperature and turbulence length scale at two different laser radiation wavelengths.
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两种不同激光辐射波长下的光束位移与温度和湍流长度尺度的函数关系。
DOI：
10.1364/ao.51.000055
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发表时间：
2012
期刊：
影响因子：
1.9
通讯作者：
D. Wright
中科院分区：
文献类型：
--
作者：
W. Isterling;B. Dally;Z. Alwahabi;M. Dubovinsky;D. Wright
从飞机发出的窄激光束有时会穿过发动机的排气羽流，并可能降低某些激光束的特性。本文报道了在一个特性良好的实验室燃烧器中，在与飞机发动机排气羽流有关的条件下，对激光束通过湍流热气体传播所产生的偏差进行的控制研究。研究了温度、激光波长和湍流长度尺度对光束偏差的影响。结果表明，激光束的位移随湍流积分长度尺度的增大而增大。采用两种不同的激光波长，即4.67 μm和632.8nm，记录了温度对激光束角偏差σ的影响。发现两个波长的光束偏差可以使用形式为σ=a（B+（1/T）（2））（-1）的单个函数半经验地建模，其中仅具有两个参数a和B，其中σ以微弧度为单位，T以°C为单位。
Narrow laser beams directed from aircraft may at times pass through the exhaust plume of the engines and potentially degrade some of the laser beam characteristics. This paper reports on controlled studies of laser beam deviation arising from propagation through turbulent hot gases, in a well-characterized laboratory burner, with conditions of relevance to aircraft engine exhaust plumes. The impact of the temperature, laser wavelength, and turbulence length scale on the beam deviation has been investigated. It was found that the laser beam displacement increases with the turbulent integral length scale. The effect of temperature on the laser beam angular deviation, σ, using two different laser wavelengths, namely 4.67 μm and 632.8 nm, was recorded. It was found that the beam deviation for both wavelengths may be semiempirically modeled using a single function of the form, σ=a(b+(1/T)(2))(-1), with two parameters only, a and b, where σ is in microradians and T is the temperature in °C.