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Angle dependent stray light measurements of high power laser radiation in natural atmospheric environments

机译：在自然大气环境中高功率激光辐射的角度相关杂散光测量

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Measurements of parameters of the natural atmospheric environment, like aerosol and precipitation distributions as well as the visibility, are simultaneously performed together with the angle dependent scattering of high power laser radiation. These measurements were obtained on the free transmission test range operated by the German Aerospace Center (DLR) in Lampoldshausen. The applied high power disk laser system operates at a wavelength of 1030 nm and all presented measurements are performed at an output power of 3000 W in continuous wave. The laser beam is propagating along the 130 m test range and the focus is ten meters away from the detection setup for the scattered light. Each of the five detection systems consist of a fiber-coupled photoreceiver and all fiber-couplers are positioned on a stage at angles of 30°, 60°, 90°, 120° and 150°, respectively to the direction of the laser beam. The distance between the fiber-couplers and the detection volume is 500 mm and the aperture is about 22 mm. The laser beam is modulated at 10 Hz and the signals of the photoreceivers are transmitted to lock-in amplifiers. The transportable setup is protected by a weatherproofed box and is operated under various conditions and precipitations, like rain and snow. In order to obtain absolute values the detection systems are calibrated using an integrating sphere. The experimental setup of the calibration system is introduced and measurements of angle dependent absolute scattering powers in dependence on the power transmission loss, the geometric scattering coefficient and the visibility are shown.
机译：同时对自然大气环境的参数（例如气溶胶和降水分布以及可见性）进行测量，并同时进行与角度相关的高功率激光辐射散射。这些测量值是在兰帕兹豪森（Lampoldshausen）的德国航空航天中心（DLR）的免费传输测试范围内获得的。所应用的高功率圆盘激光系统在1030 nm的波长下工作，所有呈现的测量均在连续波的3000 W输出功率下进行。激光束在130 m的测试范围内传播，焦点距离散射光的检测装置十米。五个检测系统中的每一个都由一个光纤耦合的光接收器组成，所有光纤耦合器都分别以相对于激光束方向成30°，60°，90°，120°和150°的角度放置在一个平台上。光纤耦合器与检测体积之间的距离为500毫米，孔径约为22毫米。激光束被调制为10 Hz，并且光接收器的信号被传输到锁定放大器。可运输的装置受到防风雨箱的保护，可在各种条件和降雨（如雨雪）下运行。为了获得绝对值，使用积分球对检测系统进行校准。介绍了校准系统的实验设置，并显示了取决于功率传输损耗，几何散射系数和可见度的角度相关绝对散射功率的测量结果。

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