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Polarization-irrelevant tunable Fabry-Perot filter

A Perot filter and Fab technology, applied in the field of tunable Fabry-Perot filter, can solve the problems of high precision of mechanical parts, difficulty in miniaturization, complex drive circuit, etc., and achieve no mechanical movement Parts, large free spectral range, stable and reliable performance

Inactive Publication Date: 2012-11-28
GP PHOTONICS INC
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

For the air-spaced Fabry-Perot etalon, it can be tuned by changing the incident angle of light, but the tuning range of this method is very small; it is also possible to change the Fabry-Perot etalon by mechanical methods (such as stepping motors). The cavity length of the Perot etalon is tuned. This method can achieve a large tuning range, but the tuning accuracy is low, and the precision of the mechanical parts is high, and the stability is not good.
In addition, the PZT piezoelectric ceramic (lead zirconate titanate) technology can improve the tuning accuracy and speed by changing the cavity length of the Fabry-Perot etalon, but it is not easy to miniaturize, and the drive circuit is also more complicated
Changing the temperature of the etalon can also achieve a large range of tuning, however, the disadvantage of this method is that it is slow

Method used

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Embodiment Construction

[0025] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] figure 1 A schematic diagram of a common Fabry-Perot optical etalon 100 is given. The material of the Fabry-Perot optical etalon 100 generally adopts optical glass such as fused silica or BK7 in the near-infrared and visible light bands. Assuming that the refractive index of the material is n, the two light-transmitting surfaces 2 and 4 are all coated with high The reflective film, whose reflectivity is R, has a thickness of h, and light is incident at an incident angle close to zero, can only pass through the etalon if it satisfies 2nh=mλ, where m is the order of the transmitted light. Free Spectral Range FSR of Optical Etalon 100 1 Can be expressed as: Δλ=λ 2 / (2nh), or expressed in frequency: Δv=c / (2nh), where c is the speed of light. The peak frequency of transmitted light can be expressed as: v=mc / (2nh), where m is the interfere...

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Abstract

The invention relates to a polarization-irrelevant tunable Fabry-Perot filter which is characterized by comprising two liquid crystal boxes and a drive circuit; the two liquid crystal boxes respectively comprises a first optic transparent material, a liquid crystal material and a second optic transparent material which are installed sequentially; the second optic transparent material of the first liquid crystal box and the first optic transparent material of the second liquid crystal box are installed together; the optical axes of liquid crystal materials in the two liquid crystal boxes are vertical to each other and are arranged in a Fabry-Perot cavity; and the drive circuit is connected with the two liquid crystal boxes and a turning function of the filter is realized by controlling effective refractive indexes of the liquid crystal materials. The polarization-irrelevant tunable Fabry-Perot filter is reasonable in design, stable and reliable in performance, low in cost, small in size, easy for installation and production, and the like, has the turning characteristic irrelevant to a polarization state of incident light, does not have a mechanical moving part, and can be widely applied to the fields of lasers, optical test, optical fiber communication, organisms, medical equipment, optical fiber sensor networks, and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronics, in particular to a polarization-independent tunable Fabry-Perot filter. Background technique [0002] The traditional optical Fabry-Perot etalon is a filter device made by the principle of multi-beam interference. There are two main types: one is air-spaced, and the other is optical glass-spaced. The multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film on the two optical surfaces of the optical Fabry-Perot etalon can realize multi-wavelength narrow-band in a wide spectral range Filter output, and has the characteristics of stable performance, large aperture, high optical power destruction threshold, simple structure and low cost, so it is widely used in various lasers, optical measuring instruments and optical fiber communication devices. [0003] The frequency tuning function of the transmitted light can be realized by using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G02F1/1335G02F1/133
CPCG02B26/001G02F1/216G02F2203/06G02F1/213
Inventor 高培良
Owner GP PHOTONICS INC
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