RU1781662C - Mirror corrector of wave-front - Google Patents

Abstract

Usage: as a wavefront corrector in receiving and transmitting optical systems. SUMMARY OF THE INVENTION: expanding functionality due to the ability to control the slopes of the phase front. The corrector comprises a dielectric plate, first and second piezoelectric elements, reflective coating and fastening. The corrector provides control of the wavefront both in position and in slopes. 3 ill.

Description

The invention relates to the field of adaptive optics. In particular, to constructions of deformable mirrors, and can be used as a wavefront corrector in receiving and transmitting optical systems to compensate for wavefront distortion of light radiation.

Phase-front mirror correctors are known for controlling the slopes of individual segments. The disadvantage of these devices is the complexity and large dimensions due to the use of piezoelectric packs as actuators.

. The closest in technical essence and the achieved positive effect to the proposed device is a deformable mirror containing a dielectric plate and plate. The front surface of the plate is optically polished and coated with a reflective layer. On the surface of the plate there are blind cylindrical holes with a recess and a protrusion, in which piezoelectric elements are located, made in the form of a pair of circular disks made of piezoceramics connected by unlike poles. When the voltage is connected to the piezoelectric elements, they bend perpendicular to the plane of the reflecting surface, while simultaneously with the bending of the piezoelectric elements, the reflecting surface deforms as well. The disadvantage of the prototype is the inability to control the slopes of the wavefront.

The aim of the invention is to expand the functionality by providing the ability to control the slopes of the wavefront.

The proposed wavefront mirror corrector contains a dielectric plate connected to the first piezoelectric elements made in the form of two circular disks connected by opposite polarization poles and fixed in a cylindrical hole made in the dielectric plate, the depth of which is equal to the thickness of the first piezoelectric elements. A dielectric plate is connected to the dielectric plate with through holes, coaxially with which cylindrical blind holes are made.

In contrast to the prototype in the proposed device in the dielectric plate made through cylindrical holes, coaxial holes in the dielectric plate and a diameter equal to the diameter

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blind holes in the plate, fixtures are additionally introduced, the second piezoelectric elements, each of which is made in the form of an amorphous piezoelectric plate with a metal substrate and four specialized control electrodes, flexible connections and a reflective element, while the second piezoelectric elements are coaxially attached to the first by means of fasteners . Flexible couplings located along the generatrix of the second piezoelectric elements in the center of the respective control electrodes are attached to the reflective element. Reflecting elements can be made in the form of segmented mirrors.

In FIG. 1. 2 shows embodiments of one drive of the proposed wavefront corrector; in FIG. 3 - the appearance of the segmented electrodes of the second piezoelectric elements.

In Figs. 1, 2, 3, the following notation is adopted: 2 - the first piezoelectric elements; 3 - dielectric plate; 4 - mount; 5 - second piezoelectric elements; 6-sectioned electrodes of the second piezoelectric elements; 7 - flexible rods; 8 - reflective element.

In Figs. 1,2, 3, a dielectric plate 1 with through holes is connected to the first piezoelectric elements 2 made in the form of two circular disks connected by unlike poles of polarization and fixed in a cylindrical hole made in the dielectric plate 1, the depth of which is equal to the thickness of the first piezoelectric elements 2 A dielectric plate 3 is connected to the dielectric plate 1 with through holes, coaxially with which there are cylindrical blind holes, the diameter of which is equal to the diameter of the through holes in the die the electric plate 1. The through hole in the dielectric plate 3 is made coaxially with the blind hole in the dielectric plate 1. Using the fastener A, the second piezoelectric elements 5 with four sectioned electrodes b are connected to the first piezoelectric elements 2. Using flexible wires 7 located along the generatrix of the second piezoelectric elements in the center of the respective control electrodes, the second piezoelectric elements 5 are attached to the reflective element 8 in the form of a membrane. The reflecting element 8 can also be made in the form of segmented mirrors. In FIG. 1, 2, 3. The device of only one wire is shown. In the wavefront corrector, the number of such drives made in a similar way can be arbitrary and is determined by the requirement of accuracy of the wavefront approximation.

The device operates as follows, the wavefront with piecewise linear

approximations are usually represented as:

p i (x, y) ai + Kxix + Kyiy, where p i (x, y) is the phase front; ai is the shift;

Kxi and Kyi - x and y slopes.

When a voltage is proportional to the first piezoelectric elements, shear correction is carried out. When a voltage proportional to Kxi is applied to the first electrodes 6, a voltage proportional to Ki is mixed with respect to the metal substrate, and a voltage proportional to Kyi is supplied to the second electrodes 6, which is proportional to the metal substrate,

correction of the slopes of the wavefront. This is due to the bending of the edges of the second piezoelectric element.

When implementing the wavefront corrector as piezoelectric elements,

for example, piezoelectric elements based on the TsTBS-3 piezoceramics should be used.

The proposed device compares favorably with the prototype with the ability to control the wavefront as in

shifts and slopes. Such control significantly increases the effectiveness of the correction.

Claims (1)

SUMMARY OF THE INVENTION A wavefront mirror corrector comprising a dielectric plate connected to the first piezoelectric elements made in the form of two circular disks connected by opposite polarization poles and fixed in a blind cylindrical hole made in the dielectric plate, the depth of which is equal to the thickness of the first piezoelectric elements, with a dielectric plate a dielectric plate is connected with through holes, coaxially with which cylindrical blind holes are made, characterized in that for the purpose of expanding the functional capabilities by providing control tiltably in the dielectric plate cylinder openings formed coaxial apertures in the insulating plate, and a diameter equal to the diameter of the blind holes in the plate, further administered attachment second 5 piezoelectric elements, each of which is made in a side of a unimorphic piezoelectric plate with a metal substrate and four sectioned control electrodes, flexible connections and a reflective element, 517816626 in this case, the second piezoelectric elements coaxially of the second piezoelectric elements in the center are attached to the first by means of fastening control electrodes, flexible connections arranged in the opposite direction to the reflective element. Fig. / "3 ( X. J -T: V l iJj r - l4i V | y -4r3 V4 1- VV 8: “4 4“ -1 F &. S 8