LASER RESONATOR OPTICAL ELEMENT Russian patent published in 2001 - IPC

FIELD: laser engineering; laser resonators. SUBSTANCE: device is, essentially, reflecting diffraction element that has substrate with periodic metal profile deposited on its effective surface, its period being shorter than radiation wavelength. Direction of profile lines and desired direction of electric field vector form angle smaller than 15 deg. Width d and height h of profile projections are found from formulas where T is profile period; n is substrate index of refraction; λ is radiation wavelength. Optical element is distinguished by high selectivity with respect to radiation with azimuthal or radial polarization. EFFECT: enhanced reflection power and beam stability of optical element. 6 cl, 4 dwg, 2 tbl