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Guided wave resonance based polarization method

A guided wave resonance and polarization technology, which is applied in the field of optoelectronic communication and optical information processing, can solve the problems of limited application range, device performance degradation, performance difference, etc., and achieve the effect of reducing insertion loss, small light intensity loss, and small insertion loss

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
Comparison scheme
Effect test

Embodiment 1

[0026] 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 is 690.0nm, and the metal film 2 on the bottom surface is made of silver (ε=-19.69+i1.24 at a wavelength of 690.0nm). The material of the dielectric thin film 3 is a polymer with a refractive index of 1.68 and a thickness of 0.45 μm. The inclination angles of the two planes on the side of the elongated prism 1 to the bottom surface are 42.6 degrees and 54.2 degrees respectively, and its height is about 1 cm. The light beam forms two reflections on its lower bottom surface; the incident angle of the incident laser beam 6 and the exit angle of the exit laser beam 7 are both 42.6 degrees, while the incident angle of the incident laser beam 8 and the exit angle of the exit laser beam 9 are both 54.2 degrees , even if they are perpendicular to the two planes on both sides of the elongated prism 1; To select P polarized light...

Embodiment 2

[0030] 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 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 material of the dielectric thin film 3 is a polymer with a refractive index of 1.68 and a thickness of 0.9 μm. Two planes on the side of the elongated prism 1 are respectively 42.85 degrees and 51.1 degrees to the inclination of the bottom surface, its height is about 1.2 cm, the length of the upper bottom surface is 2.3 cm, and the length of the lower bottom surface is about 4.5 cm, which satisfies the two reflection conditions, so that The laser beam forms two reflections on its lower bottom surface; the incident angle of the incident laser beam 6 and the exit angle of the exit laser beam 7 are both 42.85 degrees, while the incident angle of the incident laser beam 8 and the exit ang...

Embodiment 3

[0034] Step 1: The material of the elongated prism 1 is an elongated prism with a high refractive index (ZF6, n=1.7355). The incident laser wavelength is 1550.0nm, and the material of the metal film 2 on the bottom surface is gold (ε=-117.34+i10.95 at a wavelength of 1550.0nm). The material of the dielectric thin film 3 is a polymer with a refractive index of 1.68 and a thickness of 0.9 μm. The inclination angles of the two planes on the side of the elongated prism 1 to the bottom surface are 37.0 degrees and 47.35 degrees respectively, and its height is about 0.8cm. The light beam forms three reflections on its lower bottom surface; the incident angle of the incident laser beam 6 and the exit angle of the exit laser beam 7 are all 37.0 degrees, and the incident angle of the incident laser beam 8 and the exit angle of the exit laser beam 9 are all 47.35 degrees, Even if they are respectively perpendicular to the two planes on both sides of the elongated prism 1; and a layer o...

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Abstract

The invention is a polarizing method based on the wave-guide resonance, belonging to the photoelectron communication and optical information process field. It excites the wave-guide resonance in the lengthened prism with the metal and medium film plated on the bottom surface in order, at the angle of the resonance, the resonance only attenuating S or P wave in the laser beam and allowing the P orS wave to completely pass through, and makes the laser beam irradiate at the angle of the resonance for completely getting rid of the S or P wave and only leaving the P or S wave, which realizes the high polarization.

Description

technical field [0001] The invention relates to a method for generating polarized light, in particular to a polarization method with high polarization extinction ratio based on guided wave 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/26G02F1/01H04B10/25
Inventor 陈洸曹庄琪李翔刘选斌沈启舜
Owner SHANGHAI JIAO TONG UNIV
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