Hoffman R A
Appl Opt. 1974 Jun 1;13(6):1405-11. doi: 10.1364/AO.13.001405.
The construction and operation of an apparatus for the measurement of optical absorptivity in mirrors at various laser wavelengths are described in detail. The sample mirror, in vacuum, is irradiated with a laser, and the reflected laser beam is absorbed in a blackened detector cone. The equilibrium temperature rise of the sample and detector cone, due to heating by the laser, is recorded. With the laser beam interrupted, these same temperatures are reproduced by the use of heaters attached to the sample and cone. Measurement of the power to the two heaters allows a very accurate determination of the mirror absorptivity. This apparatus is capable of measuring mirrors of 0.01 absorptivity with a precision of </=1.4% and a systematic error of </=1.6%. Illustrative data for mechanically polished copper mirrors yield an average value of 0.0076 for the absorptivity at a wavelength of 10.6 microm.
详细描述了一种用于测量各种激光波长下镜子光吸收率的装置的构建和操作。在真空中，用激光照射样品镜，反射的激光束被涂黑的探测器锥体吸收。记录由于激光加热导致的样品和探测器锥体的平衡温度升高。在激光束中断的情况下，通过使用连接到样品和锥体的加热器来再现这些相同的温度。测量两个加热器的功率可以非常精确地确定镜子的吸收率。该装置能够测量吸收率为0.01的镜子，精度≤1.4%，系统误差≤1.6%。机械抛光铜镜的示例数据给出了在波长10.6微米处吸收率的平均值为0.0076。
