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55 mW beam Annual subscription automatic data processing beam diameter beam splitter Bureau of Standards calibration Center chopper and detector chopper speed compensate delayed reference square demodulated detector from instrument detector output EI.SB Electronics Federal feedback resistors Figure l9 filter following divisions G. W. Day gold black He-Ne laser Institute consists Institute for Basic Laser Power Meter level laser power Level Laser Radiation linearity Low Level Laser Measurement of Low mW F.S. mW/cm National Bureau neutral density filter noise equivalent power nonlinearity Office Ph Ph Ph phototransistor physical measurement Pl/PSI plastic pyroelectric detectors polyvinylidene fluoride power density power level preamp preamplifier Program Pyroelectric Power Meter ratio P2/PSI ratio P2/PSI divided ratio Pl/PSI divided reference square wave Response map rH rH room temperature shown in figure spectral response standard deviation Standard Reference Data SYNCHRONOUS RECTIFIER thermister transfer standard Uniformity maps uniformity scan wavelength