Abstract: In the proposed design of the spectrometer provision has been made to measure the reflectivity, transmittance and scattering factor of laser mirrors and their glass blanks before actual coating. The spectrometer is in the form of a double beam ratio recording system and works on the principle of modulation radiometry. The design is expected to provide lower value of uncertainty, on the order of 5 part in 10000 in the measurements, because of use of integrating sphere, solid state signal processing electronics and single photodetector. The remarkable features of this design are: ambient light does not affect the measurements and care has been taken to reduce the effects of source fluctuations and polarization due to presence of optical components.!10
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