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Light filter device for spectral analysis system

A technology of spectral analysis and optical filtering, applied in optics, nonlinear optics, instruments, etc., can solve the problems of complex AOTF series structure, and achieve the effect of minimizing light loss

Pending Publication Date: 2017-08-08
JINHUA VOCATIONAL TECH COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the spectral resolution, the prior art uses two AOTFs connected in series, and the spectral resolution of one AOTF is sinc 2 function, then the spectral resolution of the light after passing through two series-connected AOTFs is sinc 4 The function of the two AOTF serial structures in the prior art is obviously too complicated

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  • Light filter device for spectral analysis system
  • Light filter device for spectral analysis system
  • Light filter device for spectral analysis system

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Embodiment Construction

[0019] Such as figure 1 It is a schematic diagram of the present invention, mainly including a polarizer 1, a polarizing beam splitter 2, an acousto-optic tunable filter 3, a detector 4, a plane mirror, the first filtered light 7, the second filtered light 8, and the light passes through the described After the polarizer 1, the e-light with an unusual polarization state is emitted, and enters the acousto-optic tunable filter 3 after passing through the polarizing beam splitter 2, and the acousto-optic tunable filter 3 in the acousto-optic tunable filter 3 interacts The effect causes the incident light to diffract, and the wavelength of the filtered light has a relationship with the acoustic frequency f applied to the acousto-optic tunable filter 3 in C e =-cos(θ e -γ), D o =-sin 2 θ o ,D e = sin 2 θ e , where V a is the sound velocity, λ e is the central wavelength of the incident e light, λ o is the central wavelength of the incident o light, n o is the ref...

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Abstract

The invention relates to the technical field of optoelectronic equipment, and provides a light filter device for a spectral analysis system. The light filter device mainly comprises a polarizer, a polarization bundle light splitter, an acoustooptic tunable filter, a detector, a plane mirror I, a plane mirror II, primary filtered light and secondary filtered light, wherein a light ray is emitted as e light in an extraordinary polarization state; the light enters the acoustooptic tunable filter after passing through the polarization bundle light splitter; an acoustooptic interaction in the acoustooptic tunable filter allows the incident light to generate diffraction; positions of the acoustooptic tunable filter, the detector, the plane mirror I and the plane mirror II can be adjusted; an angle of the incident light can be changed by adjusting the position of the acoustooptic tunable filter; the primary filtered light can enter the acoustooptic tunable filter again by adjusting the positions of the plane mirror I and the plane mirror II; the detector can collect the secondary filtered light; the device can perform secondary filtration on the light.

Description

technical field [0001] The invention relates to the technical field of optoelectronic equipment, in particular to a single acousto-optic tunable filter and a special optical path for secondary filtering of light, which increases the spectral resolution of the spectral analysis system and suppresses side lobes. Light filtering device for spectroscopic analysis system. Background technique [0002] The acousto-optic tunable filter (AOTF) is a solid electrically tuned band-pass filter, which uses the acousto-optic principle in anisotropic media to compensate the momentum mismatch caused by the change of the angle with the change of the birefringence with the angle. It can select and transmit light of a single wavelength from the incident light source. The basic structure of the acousto-optic tunable filter AOTF consists of three parts: an acousto-optic medium, an electro-acoustic transducer array and an acoustic terminal. When a radio frequency signal is applied to the transdu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/11
CPCG02F1/116
Inventor 赵永建方晓华张向平
Owner JINHUA VOCATIONAL TECH COLLEGE
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