Fast spatial optical switch and fabrication thereof

A spatial light and switch technology, applied in optics, nonlinear optics, instruments, etc., can solve unrealizable problems

Pending Publication Date: 2022-03-04
维达·拉万梅尔 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fabrication of such a very weak waveguide is practica...

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  • Fast spatial optical switch and fabrication thereof
  • Fast spatial optical switch and fabrication thereof
  • Fast spatial optical switch and fabrication thereof

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Embodiment Construction

[0023] The present invention provides a fast spatial light switch using first and second anisotropic uniaxial crystals with triangular 3m symmetry. The crystals are optically joined together with their optical axes (z-axis) perpendicular to each other. The interface or boundary plane between two crystals is arranged obliquely as if it were the result of the rotation of the cross-sections of the two crystals about an axis along the polarization of the incident light located in the middle of the boundary plane Same. This rotation is such that the angle between the boundary plane and the direction of light propagation is equal to or slightly larger than the critical angle corresponding to the two refractive indices of the crystal. In this way, the linearly polarized light beam impinges on the side of the first crystal opposite to the inclined interface plane, propagates along the optical axis (z-axis) of the first crystal, and undergoes total reflection at the boundary plane, an...

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Abstract

Disclosed is a fast spatial optical switch using two uniaxial optical crystals with triangular 3m symmetry and their optical axes perpendicular to each other based on the use of the Pockels effect to change the refractive index and optical axis of one of the crystals. Wherein the top surface and the bottom surface of the first crystal inducing the Pockels effect are provided with electrodes. The interfaces between the crystals form a certain angle, so that the light beam is totally reflected by the first crystal. When an electric field is applied through the first crystal, the refractive index and the crystal axis of the first crystal change, so that the interface becomes transmissive, and a light beam is emitted from the second crystal. The spatial separation of the transmissive and reflective states provides crosstalk and extinction ratios greater than 50 dB.

Description

technical field [0001] The present invention relates to spatial optical switches, and more particularly to fast optical switches in which light beams are rapidly switched between reflective and transmissive states. Lithium niobate was used as a uniaxial crystal with triangular 3m symmetry requiring an applied electric field of ~5V / μm in the spatial switching of the beam. Background technique [0002] In order to facilitate the understanding of the present invention, two physical phenomena are first explained. First, there is an optical concept known as the "critical angle". The critical angle is the angle of incidence at which the angle of refraction is 90° measured relative to the normal to the refractive boundary between two materials through which the beam can pass. The so-called "critical angle" exists if and only if the beam striking the boundary is in a medium with a higher refractive index than the material on the other side. If the angle of incidence of light inci...

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Application Information

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IPC IPC(8): G02F1/03G02F1/01
CPCG02F1/0311G02F1/0338G02F1/0316G02F1/0136
Inventor 维达·拉万梅尔贾姆希德·纳耶
Owner 维达·拉万梅尔
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