CN107203055A - A kind of light filter method for spectroscopic analysis system - Google Patents
A kind of light filter method for spectroscopic analysis system Download PDFInfo
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- CN107203055A CN107203055A CN201710341416.3A CN201710341416A CN107203055A CN 107203055 A CN107203055 A CN 107203055A CN 201710341416 A CN201710341416 A CN 201710341416A CN 107203055 A CN107203055 A CN 107203055A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/116—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves using an optically anisotropic medium, wherein the incident and the diffracted light waves have different polarizations, e.g. acousto-optic tunable filter [AOTF]
Abstract
The present invention relates to optoelectronic device technical field, a kind of light filter method for spectroscopic analysis system, it is determined that need the spectral region analyzed, i.e., into spectroscopic analysis system light wave-length coverage;According to above-mentioned spectral region, the design parameters such as the frequency of sound wave of the acousto-optic tunable filter are determined;Adjust the level crossing I and level crossing II positions so that the first time filters out light and is again introduced into the acousto-optic tunable filter;The position of the detector is adjusted, can collect and described filter out light for the second time;Adjust the angle of the acousto-optic tunable filter and incident light, find suitable δ values, light is filtered out for the first time and the difference of the centre wavelength of light is filtered out for the second time, while spectral resolution is improved, ensure that described to filter out light for the second time sufficiently strong at the peak of spectral centroid frequency.The present invention uses single acousto-optic tunable filter, and structure simplifies, and can make the incident minimum optical losses of extraordinary, add spectral resolution and inhibit secondary lobe.
Description
Technical field
It is particularly a kind of using single acousto-optic tunable filter and using special the present invention relates to optoelectronic device technical field
Different light path is used for spectrum to light progress secondary filter, the one kind for adding the spectral resolution of spectroscopic analysis system and inhibiting secondary lobe
The light filter method of analysis system.
Background technology
Acousto-optic tunable filter AOTF is a kind of solid electrically adjusted band-pass filter, make use of the sound in anisotropic medium
Light principle, the momentum mismatch caused by angle change is compensated with double refraction amount with the change of angle, can be from incident light source
Middle selection, the light for transmiting single wavelength.The acousto-optic tunable filter AOTF sound optical medium of basic structure, electro-acoustic transducing
Device array and the part of acoustical terminal three, when radiofrequency signal is added on transducer, motivates ultrasonic wave and are coupled in acousto-optic medium;
When natural light with certain incident angles to the acousto-optic medium when, due to acousto-optic interaction, incident light is diffracted into two beams
Orthogonal linearly polarized light, i.e. ordinary light (o light) and extraordinary ray (e light), change ultrasonic frequency, two polarised light wavelength are also by phase
It should change.Wavelength (one be filtered off of transmitted light is controlled by changing the radiofrequency signal acted on AOTF electro-acoustic transducers
Order diffraction light), carrier frequency is changed according to wave-length coverage, it becomes possible to obtain the spectrum analysis of gamut;By adjusting radio frequency
The amplitude of signal, can also adjust transmitted light (filtering out light) intensity.The performance of spectroscopic analysis system is main by wavelength tuning range, light
Spectral resolution, secondary lobe determine that, due to the diffraction of light, the light in some ad-hoc location detected in spectroscopic analysis system exists
Frequency domain representation is the peak of a basic frequency, in addition also has some secondary small peaks in the peak both sides of basic frequency, here it is so-called
Secondary lobe.In order to improve spectral resolution, prior art uses the AOTF of two series connection, and AOTF spectral resolution is sinc2
Function, then light by two series connection AOTF after spectral resolution be sinc4Function, prior art two AOTF series connection
Structure is substantially excessively complicated.
The content of the invention
In order to solve the above problems, the present invention uses single acousto-optic tunable filter AOTF, changes and simplifies existing
The structure of two acousto-optic tunable filter series connection in technology.
The technical solution adopted in the present invention is:
A kind of light filter method for spectroscopic analysis system, device mainly include the polarizer, polarization beam splitter,
Acousto-optic tunable filter, detector, level crossing I, level crossing II, light is filtered out for the first time, light is filtered out for the second time, described device energy
Enough that secondary filter is carried out to light, light is projected after the polarizer with the e light of extraordinary polarization state, is passing through the polarization
Enter the acousto-optic tunable filter after beam optical splitter, the acousto-optic interaction in the acousto-optic tunable filter cause into
Penetrate light and produce diffraction, filtering out audio frequency f of the optical wavelength with applying to acousto-optic tunable filter relation has
Wherein
Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the centre wavelength of incident e light, λoFor incidence
O light centre wavelength, noIt is refractive index of the acousto-optic tunable filter to o light, neIt is the acousto-optic tunable filter
To the refractive index of e light, θoAnd θeIt is the folder of the incident light and the optical axis of crystal in the acousto-optic tunable filter of o light and e light respectively
Angle, γ is sound incidence angle.
The first time is filtered out after light is reflected by the level crossing I and level crossing II further through the polarization beam splitter,
Enter the acousto-optic tunable filter again, being again introduced into the light of the acousto-optic tunable filter needs by accurate accurate
Directly to ensure invariable incident angle, finally, the first time filters out light and is diffracted to non-seek again by the acousto-optic tunable filter
Normality is simultaneously separated, i.e., described to filter out light for the second time, by the detector measurement.
A kind of light filtering method steps for spectroscopic analysis system are:
One, determine need analyze spectral region, i.e., into spectroscopic analysis system light wave-length coverage;
Two, determine the design parameters such as the frequency of sound wave of the acousto-optic tunable filter according to above-mentioned spectral region;
Three, adjust the level crossing I and level crossing II positions so that the first time filters out light and is again introduced into the acousto-optic
Tunable optic filter;
Four, adjust the position of the detector, can collect and described filter out light for the second time;
Five, adjust the angle of the acousto-optic tunable filter and incident light, find suitable δ values, i.e., filter out for the first time
The difference of centre wavelength of the light with filtering out light for the second time, while spectral resolution is improved, ensure that described second
The peak that light is filtered out in spectral centroid frequency is sufficiently strong, and its principle is, audio frequency f and incidence angle in the acousto-optic tunable filter
Relation:Under certain audio frequency f, the wavelength that o light and e light generally filter out ripple when with identical incident angles be it is different,
That is, only in some specific audio frequency value, the wavelength for filtering out light of o light and e light is approached, i.e., δ is close to zero, Cai Nengjing
The narrow band pass filter crossed in subsequent optical path, o light and e light could be collected simultaneously, to improve spectral resolution.Due to δ and incident light
Incidence angle it is relevant, incidence angle can be controlled by rotating the acousto-optic tunable filter, to cause δ to be close to zero.But
It is that δ change can cause to filter out the change of the light peak intensity of frequency of heart wherein for the second time, it is therefore desirable to find suitable δ values, from
And reach spectral resolution and filter out the light intensity of light and all meet requirement.
The spectral response of the secondary filter method of the present invention, is proportional to the spectral response and second during the incidence of first time e light
Product F=(k, δ) the ∝ F of spectral response when secondary o light is incidenteo(k)×Foe(k+ δ), wherein F is total spectral response, FeoIt is
Spectral response during e light incidence, FoeIt is spectral response when second of o light is incident.
The beneficial effects of the invention are as follows:
The present invention uses single acousto-optic tunable filter AOTF, simplifies the knot of two AOTF series connection in the prior art
Structure, enables to the minimum optical losses of extraordinary incident light, carries out secondary filter to light using the special light path of the present apparatus, increases
Add the spectral resolution of spectroscopic analysis system and inhibit secondary lobe.
Brief description of the drawings
Further illustrated with reference to the figure of the present invention:
Fig. 1 is schematic diagram of the present invention.
In figure, 1. polarizers, 2. polarization beam splitters, 3. acousto-optic tunable filter AOTF, 4. detectors, 5. level crossings
I, 6. level crossing II, 7. first times filter out light, and 8. filter out light second.
Embodiment
If Fig. 1 is schematic diagram of the present invention, device mainly includes the polarizer 1, polarization beam splitter 2, acousto-optic tunable filtering
Device 3, detector 4, level crossing I 5, level crossing II 6, light 7 being filtered out for the first time, light 8 is filtered out for the second time, described device can be to light
Secondary filter is carried out, light is projected after the polarizer 1 with the e light of extraordinary polarization state, by the polarisation beam point
Enter the acousto-optic tunable filter 3 after light device 2, the acousto-optic interaction in the acousto-optic tunable filter 3 cause into
Penetrate light and produce diffraction, filtering out audio frequency f of the optical wavelength with applying to the acousto-optic tunable filter 3 relation has
Wherein
Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the centre wavelength of incident e light, λoFor incidence
O light centre wavelength, noIt is the acousto-optic tunable filter 3 to the refractive index of o light, neIt is the acousto-optic tunable filtering
Device 3 is to the refractive index of e light, θoAnd θeIt is the incident light and the optical axis of crystal in the acousto-optic tunable filter 3 of o light and e light respectively
Angle, γ is sound incidence angle,
The first time is filtered out after light 7 is reflected by the level crossing I 5 and level crossing II 6 further through the polarisation beam point
Light device 2, again into the acousto-optic tunable filter 3, be again introduced into the light of the acousto-optic tunable filter 3 need through
Precise alignment is crossed to ensure invariable incident angle, finally, the first time filters out light 7 by the acousto-optic tunable filter 3 again
Be diffracted to extraordinary state and separate, i.e., it is described to filter out light 8 for the second time, measured by the detector 4.
A kind of light filtering method steps for spectroscopic analysis system are:
One, determine need analyze spectral region, i.e., into spectroscopic analysis system light wave-length coverage;
Two, determine the design parameters such as the frequency of sound wave of the acousto-optic tunable filter 3 according to above-mentioned spectral region;
Three, adjust the level crossing I 5 and the positions of level crossing II 6 so that the first time filters out light 7 and is again introduced into institute
State acousto-optic tunable filter 3;
Four, adjust the position of the detector 4, can collect and described filter out light 8 for the second time;
Five, adjust the angle of the acousto-optic tunable filter 3 and incident light, find suitable δ values, i.e., filter out for the first time
The difference of centre wavelength of the light 7 with filtering out light 8 for the second time, while spectral resolution is improved, ensure that described second
The secondary light 8 that filters out is sufficiently strong at the peak of spectral centroid frequency, and its principle is, audio frequency f and incidence in the acousto-optic tunable filter 3
The relation at angle:Under certain audio frequency f, o light and e the light usual wavelength for filtering out ripple when with identical incident angles are different
, that is to say, that only in some specific audio frequency value, the wavelength for filtering out light of o light and e light is approached, i.e., δ is close to zero,
The narrow band pass filter that can pass through in subsequent optical path, o light and e light could be collected simultaneously, to improve spectral resolution.Because δ is with entering
The incidence angle for penetrating light is relevant, incidence angle can be controlled by rotating the acousto-optic tunable filter 3, to cause δ to be close to
Zero.But δ change can cause to filter out the change of the peak intensity of frequency of heart wherein of light 8 for the second time, it is therefore desirable to find suitable δ
Value, so as to reach spectral resolution and filter out the light intensity of light and all meet requirement.
The spectral response of the secondary filter method of the present invention, is proportional to the spectral response and second during the incidence of first time e light
Product F=(k, δ) the ∝ F of spectral response when secondary o light is incidenteo(k)×Foe(k+ δ), wherein F is total spectral response, FeoIt is
Spectral response during e light incidence, FoeIt is spectral response when second of o light is incident.
Claims (2)
1. a kind of light filter method for spectroscopic analysis system, device mainly include the polarizer (1), polarization beam splitter (2),
Acousto-optic tunable filter (3), detector (4), level crossing I (5), level crossing II (6), light (7) is filtered out for the first time, second is filtered
Light extraction (8), described device can carry out secondary filter to light, and light is after the polarizer (1) with the e of extraordinary polarization state
Light is projected, and the acousto-optic tunable filter (3), the acousto-optic tunable are being entered after the polarization beam splitter (2)
Acousto-optic interaction in wave filter (3) causes incident light to produce diffraction, filters out optical wavelength with being filtered to the acousto-optic tunable
The relation for the audio frequency f that device (3) applies has
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Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the centre wavelength of incident e light, λoFor incident o
The centre wavelength of light, noIt is the acousto-optic tunable filter (3) to the refractive index of o light, neIt is the acousto-optic tunable filter
(3) to the refractive index of e light, θoAnd θeIt is the incident light and crystal light in the acousto-optic tunable filter (3) of o light and e light respectively
The angle of axle, γ is sound incidence angle,
It is characterized in that, a kind of light filtering method steps for spectroscopic analysis system are:
One, determine need analyze spectral region, i.e., into spectroscopic analysis system light wave-length coverage;
Two, determine the design parameters such as the frequency of sound wave of the acousto-optic tunable filter (3) according to above-mentioned spectral region;
Three, adjust the level crossing I (5) and level crossing II (6) position so that the first time filters out light (7) and is again introduced into institute
State acousto-optic tunable filter (3);
Four, adjust the position of the detector (4), can collect and described filter out light (8) for the second time;
Five, adjust the acousto-optic tunable filter (3) and the angle of incident light, find suitable δ values, i.e., filter out light for the first time
(7) with the difference for the centre wavelength for filtering out light (8) for the second time, while spectral resolution is improved, ensure that described the
It is secondary that to filter out light (8) sufficiently strong at the peak of spectral centroid frequency.
2. a kind of light filter method for spectroscopic analysis system according to claim 1, it is characterized in that:Secondary filter side
The spectral response of method, be proportional to first time e light it is incident when spectral response and spectral response during incident second of o light product
F=(k, δ) ∝ Feo(k)×Foe(k+ δ), wherein F is total spectral response, FeoIt is spectral response when first time e light is incident, Foe
It is spectral response when second of o light is incident.
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Cited By (1)
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CN112964692A (en) * | 2021-02-05 | 2021-06-15 | 上海新产业光电技术有限公司 | Raman spectrum device |
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