Holographic sight with a one-dimensional telescopic optical system

A scheme of a holographic collimator sight with a one-dimensional telescopic optical system is proposed. The scheme is based on an optical system of a sight comprising a one-dimensional telescopic optical system composed of an achromatizing diffraction grating and hologram forming the image of the aiming mark. We establish that a plane diffraction grating and hologram positioned nonparallelly can function as a one-dimensional telescopic system. This system allows compensation of the different divergences of radiation in the principal cross sections of the laser diode comprising the sight and reducing the aperture of the parallel ray beam formed in the sight and used for hologram reconstruction in one of its principal cross sections. However, such a mutual alignment of the grating and hologram results in limitation of the spectral range in which the compensation of the thermal drift of the aiming line position is ensured. Equations that allow determination of the ratios of the spatial frequency of the grating and carrier spatial frequency of the hologram, which result in minimization of the thermal drift of the aiming line, are presented. Geometric parameters of the sight scheme that ensure the residual thermal drift of the aiming line that does not exceed the angular resolution of the eye while maintaining its minimum dimensions are reported. Technological aspects of the fabrication of the diffractive optical elements of the sight are considered. The scheme of the holographic collimator sight proposed in this study combines the main advantage of the light-guide-type sight scheme, i.e., the small distance from the sight base to the aiming line of 0.8 times the hologram aperture height, with relatively simple assembly and alignment of the elements of the sight optical scheme characteristic of a sight composed of a concave diffraction grating.