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55 mW beam amplifier Annual subscription automatic data processing beam diameter beam splitter Bureau of Standards calibration Center chopper and detector chopper speed delayed reference square demodulated detector from instrument detector output Federal feedback resistors Ferroelectricity figure l7 filter following divisions G. W. Day gold black He-Ne laser input Institute consists laser power meter level laser power Level Laser Radiation linearity literature survey issued Low Level Laser Measurement of Low mW F.S. mW/cm National Bureau neutral density filter noise equivalent power nonlinearity Optical P3/PSI divided Phelan phototransistor physical measurement Pl/PSI plastic pyroelectric detectors Polyvinylidene Fluoride power level preamp preamplifier Program Pyroelectric Power Meter QJ QJ ratio P2/PSI divided ratio P3/PSI readout reference square wave Response map rH rH room temperature shown in figure silicon diode power spectral response standard deviation SYNCHRONOUS RECTIFIER term drift thermister Uniformity maps uniformity scan W/cm wavelength