Improvements of optical power scale realization with a CCD-based laser stabilization system

This paper deals with improvements in the measurements of optical power by using CCD-based stabilization optics. Absolute optical power scale has been realized at discrete laser wavelengths of vertically polarized tuneable Ar+, fixed He–Ne and fixed Nd:YAG (with second harmonic) laser sources. Electrical-substitution cryogenic radiometer was operated at the helium temperature for this purpose. To make measurements on the metrological level the intensities of lasers were stabilized to better than 0.004% by using an established system. Using the highly collimated and stabilized lasers, whose beam shape and dimension were adjusted properly, leads us to measure the absolute optical powers with an uncertainty in the order of 10−4.