Tunable optical filter irrelevant to polarization state of incident light

An optical filter, incident light technology, used in static indicators, instruments, optics, etc., can solve the problem of difficult to achieve narrow-band output, and achieve the effect of high speed, small size, and no mechanical moving parts

Inactive Publication Date: 2012-11-28
GP PHOTONICS INC
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Problems solved by technology

Therefore, it is difficult to achieve a narrowband output with a tunable laser using only an acousto-optic filter

Method used

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  • Tunable optical filter irrelevant to polarization state of incident light
  • Tunable optical filter irrelevant to polarization state of incident light
  • Tunable optical filter irrelevant to polarization state of incident light

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Embodiment Construction

[0037] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] 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: Δν=c / (2nh), where c is the speed of light. The peak frequency of transmitted light can be expressed as: ν=mc / (2nh), where m is the interfere...

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Abstract

The invention relates to a tunable optical filter irrelevant to a polarization state of incident light. The tunable optical filter is characterized by comprising a tunable Fabry-Perot filter, a tunable acousto-optic filter, a polarized light synthetizing device and a system control circuit; the incident light firstly penetrates through the tunable Fabry-Perot filter, an output light beam penetrates through the tunable acousto-optic filter, polarization states of two output line polarization light beams are vertical with each other and the line polarization light beams have a certain separated included angle, and the two line polarization light beams are synthetized to a single light beam by the polarized light synthetizing device and then output; and the system control circuit can be respectively connected with the tunable Fabry-Perot filter and the tunable acousto-optic filter to realize a tunable output control function on a laser. The tunable optical filter is reasonable in design, stable and reliable in performance, small size, easy for installation and production, and the like, and can be widely applied to the fields of the 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 optoelectronic technology, in particular to a tunable optical filter which has nothing to do with the polarization state of incident light. 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. Through the multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film on the two light-passing surfaces, the multi-wavelength narrow-band filter output in a wide spectrum range can be realized, and it has stable performance and high-pass Due to the characteristics of large optical aperture, high optical power destruction threshold, simple structure and low cost, it is widely used in various lasers, optical measuring instruments and optical fiber communication devices. [0003] The frequency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/11G02F1/1333G02F1/1335G02F1/133
CPCG02F1/11G02F1/216G02F2203/06G02F1/213
Inventor 高培良
Owner GP PHOTONICS INC
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