SU274418A1 - INTERFEROMETER FOR THE CONTROL OF ABERRATIONS OF OPTICAL SYSTEMS - Google Patents

Description

The invention relates to the field of optical instrumentation, where it is often necessary to control the aberrations of optical systems, such as aspherical lenses, lens compensators, etc.

Interferometers for monitoring aberrations of optical systems are known, including a source of monochromatic light, a pinhole, a translucent mirror, a lens and a diaphragm and a part, working and reference branches.

In order to increase the accuracy of control and expansion of Dianazone controlled aberrations, a mirror lens is installed in the working branch of the proposed interferometer, refracted, and the surface of which, together with the system being controlled, forms an aberration-free image for axial rays. The center of curvature of the mirror surface of the lens is compatible with the top of the beam of rays that emerged from the controlled system and refracted by the mirror surface.

FIG. 1 shows the scheme of the proposed interferometer for monitoring optical systems in a parallel beam of rays; in fig. 2 is a diagram of an interferometer for monitoring systems from a finite distance.

Rays of light from a monochromatic source 1, passed through a pinhole 2, installed in the focus of the lens 5, and the lens itself, will be further parallel beam. The translucent mirror 4 divides the rays into two beams, one of which is directed to the reference branch of the interferometer to the flat mirror 5, after reflection from which the rays repeat their path in reverse direction. The other beam enters the working branch, in which the controlled system 6 is installed (for example, an aspherical lens) and a mirror 7. Preloml Yunha is spherical

the surface P, the lens 7 faces the controlled structure, the other spherical surface P is mirror. Reflected from a spherical surface, the rays also repeat their path in the opposite direction of the spin. Rays emerging from the working and reference branches are interconnected. To register the interference pattern, the lens 8 and the diaphragm 9 are used. The interferometer, the circuit of which is chosen: en in FIG. 2, contains, unlike the first, a dividing cube 5 and a reference spherical mirror 4. The course of the rays in the working branch of the interferometer is similar to the course of the pa fng rays. one.

The parameters of the mirror lens in its half-keg in the working branch are calculated in such a way that the controlled system 6 (see Fig. 1) together with the rotating spherical surface PI forms an aberrationless

the center of curvature from the mirror surface Yo is combined with the focus F of the system formed by the controlled system 6 and the refractive surface PI. Thus, in contrast to the known interferometers, the working branch does not have a mirror, but a mirror lens, the aperture of which is refractive and therefore influenced by the beam path. This makes it possible to expand the range of controlled aberrations and improve the accuracy of control.

The subject is invented and

An interferometer for monitoring aberrations of optical systems, containing a source of mopochromatic light, a point aperture, a translucent mirror, a lens and a diaphragm of the receiving part, a working and reference branch, characterized in that in order to improve the accuracy of control over the spreading of a range of controlled aberrations, in the working branch An interferometer is fitted with a mirror lens, the refractive superstructure of which, together with the controlled system, forms an aberration-free image for an axial beam of rays, in particular the center of curvature of the rkalnoy lens surface verschinoy aligned with the beam of rays of vyschedschih controlled system and nrelomlennyh noverhnostyu mirror.

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