Lehman John H, Cromer Christopher L
National Institute of Standards and Technology, Sources and Detectors Group, Boulder, Colorado 80305, USA.
Appl Opt. 2002 Nov 1;41(31):6531-6. doi: 10.1364/ao.41.006531.
The optical trap detector is based on two, 1 cm x 1 cm silicon photodiodes and a spherical mirror contained in a package that is highly efficient for measuring light diverging from the end of an optical fiber. The mathematical derivation of the coupling efficiency relies on the integral directional response weighted by the angular intensity distribution of an idealized parabolic optical beam. Results of directional-uniformity measurements, acquired with the aid of a six-axis industrial robotic arm, indicate that the trap has a collection efficiency greater than 99.9% for a fiber numerical aperture of 0.24. Spatial uniformity measurements indicate that the variation of detector response as a function of position is less than 0.1%. The detector's absolute responsivity at 672.3, 851.7, and 986.1 nm is also documented by comparison with other optical detectors and various input conditions and indicates that the design is well suited for laser and optical fiber power measurements.
光阱探测器基于两个1厘米×1厘米的硅光电二极管和一个球面镜，它们被封装在一个对测量从光纤末端发散的光非常高效的组件中。耦合效率的数学推导依赖于由理想化抛物线光束的角强度分布加权的积分方向响应。借助六轴工业机器人手臂进行的方向均匀性测量结果表明，对于数值孔径为0.24的光纤，该光阱的收集效率大于99.9%。空间均匀性测量表明，探测器响应随位置的变化小于0.1%。通过与其他光学探测器以及各种输入条件进行比较，还记录了该探测器在672.3、851.7和986.1纳米处的绝对响应度，这表明该设计非常适合激光和光纤功率测量。
