CN107024782A - A kind of light filter for spectroscopic analysis system - Google Patents
A kind of light filter for spectroscopic analysis system Download PDFInfo
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- CN107024782A CN107024782A CN201710341344.2A CN201710341344A CN107024782A CN 107024782 A CN107024782 A CN 107024782A CN 201710341344 A CN201710341344 A CN 201710341344A CN 107024782 A CN107024782 A CN 107024782A
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- optic tunable
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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
- 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]
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The present invention relates to optoelectronic device technical field, a kind of light filter for spectroscopic analysis system, 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, light is projected after the polarizer with the e light of extraordinary polarization state, incident light is caused to produce diffraction in the acousto-optic interaction entered after the polarization beam splitter in the acousto-optic tunable filter, the acousto-optic tunable filter；The acousto-optic tunable filter, the detector, the level crossing I and level crossing II position can be adjusted, its angle with incident light can be changed by adjusting the position of acousto-optic tunable filter, adjust level crossing I and level crossing II positions, enable to first time to filter out light and be again introduced into the acousto-optic tunable filter, the detector can collect it is described filter out light for the second time, described device can carry out secondary filter to light.
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 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 for spectroscopic analysis system mainly includes the polarizer, polarization beam splitter, acousto-optic is adjustable
Humorous wave filter, detector, level crossing, light being filtered out for the first time, light is filtered out for the second time, light is inclined with extraordinary after the polarizer
The e light of polarization state is projected, and the acousto-optic tunable filter, the acousto-optic tunable filter are being entered after the polarization beam splitter
Acousto-optic interaction in ripple device causes incident light to produce diffraction, filters out optical wavelength and to acousto-optic tunable filter application
Audio frequency f relation has Wherein
Ce=-cos (θe- γ), Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the centre wavelength of incident e light,
λoFor the centre wavelength of incident o light, noIt is refractive index of the acousto-optic tunable filter to o light, neIt is that the acousto-optic is adjustable
Humorous wave filter is to the refractive index of e light, θoAnd θeIt is the incident light and crystal in the acousto-optic tunable filter of o light and e light respectively
The angle of optical axis, γ is sound incidence angle；The level crossing include level crossing I and level crossing II, the acousto-optic tunable filter,
The position of the detector, the level crossing I and level crossing II can be adjusted, and can be filtered by adjusting the acousto-optic tunable
The position of ripple device changes its angle with incident light, adjusts the level crossing I and level crossing II positions, enables to described the
Once filter out light and be again introduced into the acousto-optic tunable filter, the detector can be collected described filters out light, institute for the second time
Secondary filter can be carried out to light by stating device.
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.
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.
Experimental procedure using a kind of light filter for spectroscopic analysis system is：
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 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, mainly include the polarizer 1, polarization beam splitter 2, acousto-optic tunable filter 3, detection
Device 4, level crossing, light 7 being filtered out for the first time, light 8 is filtered out for the second time, light is penetrated after the polarizer 1 with the e light of extraordinary polarization state
Go out, entering after the polarization beam splitter 2 in the acousto-optic tunable filter 3, the acousto-optic tunable filter 3
Acousto-optic interaction causes incident light to produce diffraction, filters out optical wavelength and the audio frequency f's to the acousto-optic tunable filter 3 application
Relation has Its
In
Ce=-cos (θe- γ), Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the centre wavelength of incident e light,
λoFor the centre wavelength of incident o light, noIt is the acousto-optic tunable filter 3 to the refractive index of o light, neIt is that the acousto-optic can
Tuning filtering device 3 is to the refractive index of e light, θoAnd θeThe incident light of o light and e light respectively with the acousto-optic tunable filter 3
The angle of the optical axis of crystal, γ is sound incidence angle；The level crossing includes level crossing I 5 and level crossing II 6, and the acousto-optic is adjustable
Humorous wave filter 3, the detector 4, the level crossing I 5 and level crossing II 6 position can be adjusted, and can pass through regulation
The position of the acousto-optic tunable filter 3 changes its angle with incident light, adjusts the level crossing I 5 and level crossing II
6 positions, enable to the first time to filter out light 7 and are again introduced into the acousto-optic tunable filter 3, the detector 4 can
Collection is described to filter out light 8 for the second time, and described device can carry out secondary filter to light.
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.
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 (1)
1. a kind of light filter for spectroscopic analysis system, mainly including the polarizer (1), polarization beam splitter (2), acousto-optic
Tunable optic filter (3), detector (4), level crossing, light (7) being filtered out for the first time, light (8) is filtered out for the second time, light is by described
Projected after the polarizer (1) with the e light of extraordinary polarization state, can into the acousto-optic after the polarization beam splitter (2)
Acousto-optic interaction in tuning filtering device (3), the acousto-optic tunable filter (3) causes incident light to produce diffraction, filters out
Audio frequency f of the optical wavelength with applying to the acousto-optic tunable filter (3) relation has
Wherein
Ce=-cos (θe- γ), Do=-sin2θo, De=sin2θe, V in formulaaIt is acoustic wave velocity, λeFor the middle cardiac wave of incident e light
It is long, λoFor the centre wavelength of incident o light, noIt is the acousto-optic tunable filter (3) to the refractive index of o light, neIt is the sound
Optic tunable filter (3) is to the refractive index of e light, θoAnd θeIt is incident light and the acousto-optic tunable filter of o light and e light respectively
The angle of the optical axis of crystal in ripple device (3), γ is sound incidence angle；It is characterized in that：The level crossing includes level crossing I (5) and plane
Mirror II (6), the acousto-optic tunable filter (3), the detector (4), the level crossing I (5) and level crossing II (6) position
Putting can be adjusted, and can change its angle with incident light by adjusting the position of the acousto-optic tunable filter (3),
The level crossing I (5) and level crossing II (6) position are adjusted, enables to the first time to filter out light (7) and is again introduced into the sound
Optic tunable filter (3), the detector (4) can collect it is described filter out light (8) for the second time, described device can be entered to light
Row secondary filter.
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| CN201710341344.2A CN107024782A (en) | 2017-05-04 | 2017-05-04 | A kind of light filter for spectroscopic analysis system |
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| CN201710341344.2A CN107024782A (en) | 2017-05-04 | 2017-05-04 | A kind of light filter for spectroscopic analysis system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469693A (en) * | 2018-04-13 | 2018-08-31 | 中国科学院西安光学精密机械研究所 | A kind of binary channels acousto-optic tunable filter and Hyperspectral imaging devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130343412A1 (en) * | 2011-06-09 | 2013-12-26 | Gp Photonics Inc | External Cavity Tunable Laser With 25 GHZ Frequency Interval |
| CN103913230A (en) * | 2014-04-18 | 2014-07-09 | 福建师范大学 | High-spectral-resolution imaging device for achieving secondary acousto-optic smoothing through single-filter |
| CN206757232U (en) * | 2017-05-04 | 2017-12-15 | 金华职业技术学院 | A kind of light filter for spectroscopic analysis system |
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2017
- 2017-05-04 CN CN201710341344.2A patent/CN107024782A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130343412A1 (en) * | 2011-06-09 | 2013-12-26 | Gp Photonics Inc | External Cavity Tunable Laser With 25 GHZ Frequency Interval |
| CN103913230A (en) * | 2014-04-18 | 2014-07-09 | 福建师范大学 | High-spectral-resolution imaging device for achieving secondary acousto-optic smoothing through single-filter |
| CN206757232U (en) * | 2017-05-04 | 2017-12-15 | 金华职业技术学院 | A kind of light filter for spectroscopic analysis system |
Non-Patent Citations (2)
| Title |
|---|
| P. A. GASS AND J. R. SAMBLES: "Accurate design of a noncollinear acousto-optic tunable filter", OPTICS LETTERS, vol. 16, no. 6, pages 429 - 431, XP000176169 * |
| 黄峻峰: "基于二氧化碲晶体的窄带声光滤波技术研究", CNKI优秀硕士学位论文全文库, no. 2016, pages 12 - 19 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469693A (en) * | 2018-04-13 | 2018-08-31 | 中国科学院西安光学精密机械研究所 | A kind of binary channels acousto-optic tunable filter and Hyperspectral imaging devices |
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