SU1732289A1 - Magneto-optical reading head - Google Patents

Abstract

Usage: in the field of spectral analysis of electrical signals by optical methods. SUMMARY OF THE INVENTION: The device comprises a substrate 3, a film of a magneto-optical material k, a protective coating 6, a multi-layer interference polarization coating 5. The protective coating 6 is adapted to absorb optical radiation. 1 il.

Description

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The invention relates to electronic engineering and can be used in location, television technology and other areas of technology.

The purpose of the invention is to improve the measurement accuracy by increasing the signal-to-noise ratio.

The drawing shows the optical layout of the device.

In the drawing, the following designations are introduced: 1 — laser light source, 2 — light beam shaper, 3 — substrate (full internal reflection prism), —MOM film that is in optical contact with prism 3, 5 — multilayer dielectric coating applied on MOM (magneto-optical material),

6- wear-resistant coating applied to the dielectric coating 5,

7 is a polarizer, 8 is an Aurier lens, 9 is a photo recorder located in series along the beam of light, a photo recorder 9 in the focal plane of the lens 8, 10 is a magnetic tape with a block of drawing 11 and recording 12, made with the possibility of scattering nor on mom. Recording unit 12 is the electrical input of the analyzer, the photographic recorder 9 is an electrical input.

Magneto-optical head works as follows.

Magnetic strip is recorded on magnetic tape 10 by recording unit 12. Block 11 extends magnetic tape 10 under prism 3 and the signal scattering fields of the tape recorder on the tape in MOM k induces a magnetization structure similar to the signal chart. The glow from the laser source 1 is expanded by the beam shaper 2 and enters the prism 3 of the total internal reflection. After passing through the prism 3, the light hits the

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MOM k and diffracts on the structure of magnetization. The rays of higher diffraction orders reflect from the multilayer dielectric coating 5, emerge from the prism 3, pass the polarizer 7 and form an electrical signal spectrum in the focal plane of the objective 8. The rays of zero order of diffusion are passed through the multilayer dielectric coating 5 and fall into the wear-resistant coating 6. Pass through the coating 6 and having experienced internal reflection, light of zero order

15 passes the multilayer coating 5, the MOM k film and exits the prism 3. The zero-order intensity will be two orders of magnitude less than the zero-order beam intensity during polarization perpendicular to the plane of incidence (when the zero-order beams do not penetrate the wear-resistant coating ). By attenuating the zero order, the background light in the diffraction order region is attenuated and the signal-to-noise ratio increases. Lotto recorder 9 reads the spectrum of the electrical signal in the focal plane of the lens 8.

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Claims (1)

Invention Formula A magneto-optical reading head, consisting of a substrate, a film of a magneto-optical material and a protective coating, is characterized in that, in order to improve the measurement accuracy, an additional multilayer interference Q layer is placed between the magneto-optical material and the protective coated at the Brewster angle to the light falling on it, and protective at 35 45 The cover is made with the possible absorption of optical radiation.