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Polarization method for generating single polarization

A single-polarization, polarization technology, applied in prisms, nonlinear optics, instruments, etc., can solve the problems of performance differences, device performance degradation, limited application scope, etc., to achieve the effect of reducing trouble, small insertion loss, and improving coupling efficiency

Inactive Publication Date: 2003-08-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these requirements are usually difficult to fully meet in actual mechanical processing and optical applications, which inevitably reduces the performance of the device.
In addition, the design of some prisms requires the light beam to be incident from one side of the prism, and if the light path is reversed by 180 degrees (this is often the case in optical applications), the performance of the device will be lower than that of the normal incidence. big difference
In addition, the bonding of two prisms usually uses materials such as Canada gum, and the absorption of these materials also greatly limits the application range of this method

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] Step 1: The material of the elongated prism 1 is an elongated prism with a high refractive index (ZF6, n=1.7355). The wavelength of the incident laser 5 is 690.0nm, and the material of the metal film 2 on the bottom surface is silver (ε=-19.69+i1.24 at a wavelength of 690.0nm). The bottom angle of the elongated prism 1 is 36.3 degrees, its height is about 1cm, the length of the upper bottom surface is 2.7cm, and the length of the lower bottom surface is about 5.4cm, which meets the two reflection conditions and enables the laser beam to form two reflections on its lower bottom surface ; And a layer of anti-reflection coatings 3, 4 are vapor-deposited on the outgoing and incident surfaces of the elongated prism 1 to reduce its reflection loss.

[0025] Step 2: Make the selected incident laser beam 5 incident on the lower bottom surface of the elongated prism 1 at a certain angle of 36.3 degrees, and excite the surface plasmon waves propagating on the interface between th...

Embodiment 2

[0028] Step 1: The material of the elongated prism 1 is an elongated prism with a high refractive index (ordinary optical glass, n=1.5). The wavelength of the incident laser 5 is 560.0nm, and the material of the metal film 2 on the bottom surface is silver (ε=-11.89+i0.83 at a wavelength of 560.0nm). The bottom angle of the elongated prism 1 is 44.3 degrees, its height is about 1.2cm, the length of the upper bottom surface is 2.5cm, and the length of the lower bottom surface is about 4.9cm. reflection, and a layer of anti-reflection coatings 3 and 4 are vapor-deposited on the outgoing and incident surfaces of the elongated prism 1 to reduce its reflection loss.

[0029] Step 2: Make the selected incident laser beam 5 incident on the lower bottom surface of the elongated prism 1 at a certain angle of 44.3 degrees, and excite the surface plasmon wave propagating on the interface between the elongated prism 1 and the metal film 2 on the bottom surface. The outgoing beam 6 is rec...

Embodiment 3

[0032] Step 1: The material of the elongated prism 1 is an elongated prism with a high refractive index (ordinary optical glass, n=1.5). The incident laser wavelength is 1550.0nm, and the metal film material is gold (ε=-117.34+i10.95 at a wavelength of 1550.0nm), which is plated on the bottom surface of the elongated prism 1 by sputtering, with a thickness of 26nm. The base angle of the elongated prism 1 is 42.1 degrees, its height is about 0.8cm, the length of the upper base is 3.5cm, and the length of the lower base is about 5.3cm, which satisfies the three reflection conditions, so that the laser beam can form three reflections on its lower base, and A layer of anti-reflection coatings 3 and 4 are evaporated on the outgoing and incident surfaces of the elongated prism 1 to reduce its reflection loss.

[0033] Step 2: make the selected incident laser beam 5 incident on the lower bottom surface of the elongated prism 1 at a certain angle of 42.1 degrees, and excite the surfac...

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Abstract

The invention is a polarizing method of producing single polarization, belonging to the photoelectron communication and optical information process field. It is based on the theory that surface plasma resonance produces single polarization, excites the resonance on the basal plane of the lengthened prism plated with the metal film, the resonance only attenuating P wave in the laser beam and allowing S wave to completely pass through, and makes the laser beam irradiate at the angle of the resonance for completely getting rid of the P wave and only leaving the S wave, which realizes the polarization of the laser beam.

Description

technical field [0001] The invention relates to a method for generating single polarization, in particular to a method for generating single polarization based on surface plasmon resonance in an elongated prism, belonging to the field of optoelectronic communication and optical information processing. Background technique [0002] In the past two decades, with the development of laser technology, especially optical communication technology, the research and application of optical polarization methods have made great progress. Among them, the most common method is the cutting birefringent prism method or bonding birefringent prism method using the birefringence effect in the crystal, and this method has been put into practical use, and there are many reports on it. After literature search, it was found that the US Patent No. 6,456,434B1 proposed a method for realizing laser beam polarization by cutting a birefringent prism. In this method, a calcite crystal is cut into a spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/04G02F1/01
Inventor 陈洸曹庄琪刘选斌李翔沈启舜
Owner SHANGHAI JIAO TONG UNIV
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