The invention relates to a cryogenic instrument for physical studies at a temperature of up to 0.45 K, and can be used for optical studies of the properties of samples, placed inside the thermostatic chamber and cooled by liquid helium-3.; The object of the utility model is a helium cryostat for optical investigations, allowing to carry out investigations of the optical properties of semiconducting microstructures in the temperature range 0.45-1.6 K and the spatial optical resolution of 1 micron.; The problem is solved by the claimed helium cryostat for optical investigations, comprising an outer housing formed of upper and lower parts, tanks of liquid helium-4, nitrogen, and helium-3, two copper screen, three optical window disposed on the outer casing and two copper screens, which is further provided with a sample holder, the lower portion of which is formed as a cone and is pressed against the conical recess in the bottom of a cylindrical vessel containing liquid helium-3, and a cylindrical tank with liquid helium-3 is provided on the optical knom disposed on a common optical axis with other windows,
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