Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for polarizing partial wave based on optical interference and dispersion principle

An optical interference and polarization beam splitter technology, applied in optics, optical elements, polarization elements, etc., can solve the problems of reducing system reliability and increasing light intensity loss, and achieve the effects of simple structure, convenient preparation and wide application

Inactive Publication Date: 2006-11-01
NANJING UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is to insert a polarizer on the optical path between the incident light and the wave splitting device, but this method inevitably reduces the reliability of the system and increases the loss of light intensity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for polarizing partial wave based on optical interference and dispersion principle
  • Method and apparatus for polarizing partial wave based on optical interference and dispersion principle
  • Method and apparatus for polarizing partial wave based on optical interference and dispersion principle

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Such as image 3 , 4 As shown, in order to illustrate this polarization splitting device, we use an α-quartz wave plate to separate two light waves with wavelengths of 1310nm and 1550nm commonly used in optical communications. In α-quartz, the dispersion relation of o-light and e-light is as image 3 (a) shown. According to the formula (1) and formula (2), the thickness of the wave plate is determined to be 540.4 μm, corresponding to the interference order m=3. Calculation results of light wave transmittance at different wavelengths, such as image 3 (b) shown. In order to verify this calculation result, we placed a quartz wave plate with a thickness of 542.0±0.5 μm between the polarizer and the polarizing beam splitter. The bandwidth of the polarizing beam splitter is 400nm (1200~1600nm), and the resolution of infrared transmission measurement is 4cm -1 , the measurement results of the two channels are as follows Figure 4 shown. The transmittance maxima of the...

example 2

[0030] The α-quartz wave plate provides a light wave with a wide frequency band that enters the device and decomposes two beams of visible and infrared polarized light that vibrate perpendicularly to each other. Provides a polarizing filter with two channels as beam splitting for a certain wavelength band. That is, when the incident light wave band covers the range from visible light to infrared light, one channel transmits polarized infrared light waves, and the other channel transmits polarized visible light waves.

[0031] Table 1 Birefringence and dispersion relations of several typical birefringent single crystal materials

[0032]

[0033]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A polarization splitting device based on the principle of optical interference and dispersion is composed of a polarizer, a birefringent crystal wave plate and a broadband polarization beam splitter. The incident light passes through the polarizer to generate a beam of incident polarized light, and the incident polarized light passes through the birefringent crystal wave plate, so that the vibration direction of the incident polarized light is normal incident with the optical axis of the wave plate at an angle of π / 4, and the incident polarized light is incident in the wave plate Divided into two beams with different propagation speeds, extraordinary light and ordinary light; their electric displacement vector D e and D o Vibrating in two mutually orthogonal directions, its refractive index n in the propagation of the wave plate e , n o Not the same, after passing through the wave plate, o-light and e-light will form a phase difference δ=2π(n e -n o )d / λ. The phase difference is a function of wavelength λ, so that one channel transmits light waves of one band, and the other channel perpendicular to it transmits light waves of another band perpendicular to the vibration direction of the first channel light waves. The beam splitting wavelength and bandwidth can be selected, and the structure is compact.

Description

1. Technical field [0001] The invention relates to a polarization splitting method and device, in particular to a polarization splitting method and device based on the principles of optical interference and dispersion. 2. Background technology [0002] Wavelength splitting devices play an important role in optics, optical devices, and fiber optic communications, and are generally used as filters and wavelength division multiplexing devices. Traditional wave splitting devices consist of gratings (refractive and reflective gratings, or fiber gratings) and optical interferometers, including Fabry-Perot interferometers, Mach-Zehnder interferometers, and multilayer optical thin film systems. The split beams emerging from these devices have the same polarization state as the incident light. However, in interferometry and some optical sensors, such as fiber optic gyroscopes, linearly polarized light is often required. The traditional method is to insert a polarizer on the optical...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G02B5/30
Inventor 谭成忠
Owner NANJING UNIV