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1. 发明授权

US5621525A Apparatus and method for measuring the power density of a laser beam with a liquid crystal 失效
标题翻译：用液晶测量激光束的功率密度的装置和方法
公开(公告)号：US5621525A
公开(公告)日：1997-04-15
申请号：US384661
申请日：1995-02-06
申请人： Thomas Vogeler , Theo Tschudi , Nelson Tabirian , Boris Zel'dovich
发明人： Thomas Vogeler , Theo Tschudi , Nelson Tabirian , Boris Zel'dovich
IPC分类号： G01J1/42 , G01K17/00 , G01B9/02
CPC分类号： G01K17/003 , G01J1/4257
摘要： Meters detect power parameter information about laser beams using liquid crystals to propagate the beam therethrough with photodiode detectors. The power parameters include intensity in watts per square meter, beam waist size, and the location of the focal spot based in light induced orientational phenomena in the liquid crystal. The detectors can can count the number of interference fringe rings produced by a laser beam passing through the liquid crystal(LC). Alternatively, the time between the occurrence of each interference fringe ring can be measured to determine the power parameters. A preferred embodiment has a standard liquid crystal oriented at approximately 45 degrees to the axis of an incoming laser beam to be measured. The beam passing through the LC can be centered through a pinhole on a planar plate causing the interference fringe rings to appear on the surface of the plate. An alternative embodiment measures intensity based on determining the voltage necessary to produce fringe ring patterns. Corresponding the fringe ring patterns to intensity values can be done manually upon visual observation and calculation or automatically by computer.
摘要翻译：仪表使用液晶检测关于激光束的功率参数信息，以通过光电二极管探测器传播光束。功率参数包括以瓦特每平方米为单位的强度，束腰尺寸以及基于液晶中的光诱导取向现象的焦点位置。检测器可以计算通过液晶（LC）的激光束产生的干涉条纹环的数量。或者，可以测量每个干涉条纹环的发生之间的时间以确定功率参数。优选实施例具有与待测量的输入激光束的轴线成大约45度的标准液晶。通过LC的光束可以通过平板上的针孔居中，导致干涉条纹环出现在板的表面上。替代实施例基于确定产生边缘环图案所需的电压来测量强度。相应的边缘环形图案与强度值可以在目视观察和计算后自动进行，也可以通过计算机自动进行。

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