SU851322A1 - Acoustic optical deflector - Google Patents

Description

(54) ACOUSTOPTIC DEFLEXER

I

The device relates to quantum technology and can be used in systems of controlled deflection of optical radiation.

Devices are known for deflecting a light beam using the refraction of light by a standing ultrasonic wave 1

The disadvantage of such devices is their low speed.

The closest to the technical n. the bones to the present Bretta austo-optical deflector contains a crystal, a piezoelectric transducer and a signal source, with input and. its exit faces are made with a cut at the Brewster angle to 5, a light beam of 2 T

The disadvantage of this device lies in the narrow range of the angular adjustment of the light, beam, the impossibility of additional dilution of one-order diffracted rays in the Ramani mode of Nat diffraction.

The purpose of the invention is to increase the angle of deviation of the diffracted rays relative to the main beam and increase the angle between the diffracted rays of the same order.

The goal is achieved by the fact that in a known device containing a crystal, a piezotransducer and an informative signal source, the output end of the deflector is made in the form of a prism whose faces are inclined at the Brewster angle for each of the diffracted rays and are covered with a light absorbing layer in the region of the main beam incident.

The drawing shows a diagram of the proposed device.

The device contains a light-sounding crystal 1, a piezoelectric transducer 2, a sound absorber 3 and a layer 4 for damping the main light beam.

Acoustoopic deflector works as follows.

In a crystal, an elastic wave is excited by means of a transducer, creating periodic regions with unequal refractive indices — a diffraction grating on which the diffracted light beam is diffracted. The selected construction corresponds to the Raman-Nata diffraction mode and provides a solution to the problem set (the deviation angle between the diffracted rays of one pore increases in proportion to the refractive index of the light and sound material, i. E). However, the use of a light-absorbing layer makes it possible to block the main beam of light. The invention of an acousto-optic deflector containing a crystal, a piezotransducer and an informative signal source, is about tl and 2d, in order to increase the deflection angle of the diffracted rays relative to the main beam and at the angle between the diffracted rays of the same order, the output end of the deflector in the form of techniques, whose faces are inclined at the Brnh angle, tera for each of the diffracted rays, and covered with a light-absorbing layer in the region of incidence of the main beam. Sources of information taken into account during the examination 1. Yu. K. Rebrin. Optical beam control in space. M., Soviet Radio, 1977, p. 3. 2. Magdich L.N. and others. AO-deflector with high efficiency. Sat Electronic Engineering, Ser. 1O. Quantum electronics .. 1975, vol. one.

Claims (1)

Claim An acousto-optic deflector containing a crystal, a piezoelectric transducer, and an informative signal source, which are characterized in that, in order to increase the deflection angle of the Diffracted rays relative to the main beam and increase the angle between the ₅ diffracted rays of the same order, the output end of the deflector is made in the form of a prism , the faces of which are inclined at a Brewster angle for each of the diffracted rays and are covered with a light-absorbing layer 10 in the region of incidence of the main beam.