Анотація:
The diffraction losses of laser mirrors were determined by using specially
designed spectrometer of spatial frequencies. Reflection surface (70 mm diameter) was
made by diamond microgrinding, but instead of an ideal plane, the circular phase grating
was formed. The Fourier-optics was applied to measure a real shape of flat laser metal
mirrors. We analysed the diffraction pattern of light reflected from metal mirror in the
Fraunhofer zone and determined periodic deviation of a surface from an ideal plane and
its parameter – spatial frequency.