CN103453988A - Cascading chromatic dispersion system for acousto-optic tunable filter - Google Patents

Cascading chromatic dispersion system for acousto-optic tunable filter Download PDF

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Publication number
CN103453988A
CN103453988A CN201310375065XA CN201310375065A CN103453988A CN 103453988 A CN103453988 A CN 103453988A CN 201310375065X A CN201310375065X A CN 201310375065XA CN 201310375065 A CN201310375065 A CN 201310375065A CN 103453988 A CN103453988 A CN 103453988A
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China
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described
acousto
tunable filter
optic tunable
diaphragm
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CN201310375065XA
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Chinese (zh)
Inventor
王策
武晓东
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中国科学院苏州生物医学工程技术研究所
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Priority to CN201310375065XA priority Critical patent/CN103453988A/en
Publication of CN103453988A publication Critical patent/CN103453988A/en

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Abstract

The invention discloses a cascading chromatic dispersion system for an acousto-optic tunable filter. The cascading chromatic dispersion system comprises a first optical system, wherein the first optical system transmits light to the acousto-optic tunable filter, and the acousto-optic tunable filter is connected with a precise radio frequency driver; the acousto-optic tunable filter transmits the light to a second optical system, wherein the second optical system transmits the light to a second level chromatic dispersion element, and the second level chromatic dispersion element transmits the light to a third optical system. A detection system comprising the cascading chromatic dispersion system for the acousto-optic tunable filter can realize parallel measurement of optical signals with a plurality of wave bands and shortens the time when only an acousto-optic tunable filtering methodis used for selecting narrow-band monochromatic light to realize spectrum measurement in a chromatic dispersion section.

Description

Acousto-optic tunable filter cascade dispersion system

Technical field

The present invention relates to a kind of dispersion system, what be specifically related to is acousto-optic tunable filter cascade dispersion system.

Background technology

Acousto-optic tunable filter (Acousto-optic Tunable Filter, AOTF) is the light-splitting device of making according to the acoustooptic effect principle, has the characteristic to light is modulated, bandwidth filtering is exported.

Acousto-optic interaction can be described by classical mechanics, also can describe with quantum mechanics.When row by radiofrequency signal when the high frequency sound wave of transducer conversion is propagated in an optics elastic medium (acousto-optic crsytal), local compression or expansion can occur in the lattice of crystals under the effect of sound wave, and the regular STRESS VARIATION of this crystals makes crystals light refractive index generation cyclical variation everywhere be similar to and formed space grating.Light wave causes at sound under the effect of grating, and diffraction phenomena will occur.

Principle based on above-mentioned acoustooptic effect, when a branch of polychromatic light passes through the acousto-optic crsytal of a dither, the narrow band light of a certain wavelength will produce diffraction at crystals, depart from certain angle transmits from crystal, the polychromatic light that diffraction does not occur is crossed crystal along the direct transmission of former light transmition direction, reaches thus the purpose of light splitting.When the input radio frequency signal frequency changes, the high frequency sound wave wavelength shift, the also corresponding change of transmissive arrowband light wavelength, this is the ultimate principle of AOTF light splitting.The AOTF device architecture is to consist of crystal and bonding transducer thereon, transducer drives electric signal (generally being about between tens megahertz to two hundred megahertzes) to be converted in intracrystalline ultrasonic vibration high-frequency RF, ultrasound wave has produced the modulation of space periodicity to acousto-optic medium, its effect is similar to diffraction grating.To produce diffraction after incident illumination is mapped to this grating, its diffraction light wavelength has corresponding relation with the frequency of high-frequency drive electric signal.Therefore, as long as change the frequency that RF drives signal, can change the diffraction light wavelength, and then reach the purpose of light splitting.When driving signal, continuous or discontinuous change RF measures the light signal strength departed from by AOTF simultaneously.Finally RF frequency and optical wavelength can be mapped, obtain the spectrum of this wave band.Current technical merit has realized that a plurality of rf frequencies act on the conllinear output that the AOTF device is realized discrete multi-wavelength light.

Adopt at present the spectral measurement system of AOTF device and technology, by adopting continuous variation radio frequency signals drive AOTF device, realize wavelength continually varying narrow band light selection output.Realize full spectral measurement by each narrowband optical signal intensity of detector measurement continually varying.Rf conversion is to form the action time (being the time that sound wave passes through crystal) that periodic refractive index changes after acoustic signals in acousto-optic crsytal, limit spectrum single point signals picking rate, inevitably had the relatively slow problem of target spectral coverage spectral measurement.

Summary of the invention

The object of the invention is to overcome the above problem that prior art exists, acousto-optic tunable filter cascade dispersion system is provided, will be separated by the acousto-optic tunable filter conllinear output multi-wavelength light of a plurality of radio frequency signals drive.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:

Acousto-optic tunable filter cascade dispersion system, comprise the first optical system, described the first optical system transmits light to acousto-optic tunable filter, described acousto-optic tunable filter is connected with accurate radio driver, described acousto-optic tunable filter transmits light to the second optical system, described the second optical system transmits light to the secondary dispersion element, and described secondary dispersion element transmits light to the 3rd optical system.

Further, described the first optical system comprises the first diaphragm, the polarizer, the first collimation lens, the second diaphragm and the first condenser lens, described the first diaphragm, the described polarizer, described the first collimation lens, described the second diaphragm and described the first condenser lens center are on same axis, and described the first diaphragm and described the second diaphragm are aperture or slit.

Further, described the second optical system comprises 0 grade of light shielding plate, the 3rd diaphragm, the second collimation lens and the 4th diaphragm, and described the 3rd diaphragm and described the 4th diaphragm are aperture or slit.

Further, described the 3rd optical system comprises the 5th diaphragm and the second condenser lens, and described the 5th diaphragm is aperture or slit.

Further, described secondary dispersion element is prism or grating.

The invention has the beneficial effects as follows:

The spectrum investigating system that the present invention forms can be realized the parallel measurement of a plurality of wave band optical signals, having shortened direct application acousto-optic tunable filtering method selects arrowband monochromatic light to measure the time of spectrum in the dispersion interval, the rear end of system of the present invention can adopt the highly sensitive high-speed response devices such as PMT, APD to compare with line array CCD as optical signal detector to have higher signal sensitivity, adopts spectral measurement time of the inventive method also to reach the technical merit of fiber spectrometer simultaneously.

The accompanying drawing explanation

Fig. 1 is system structural framework figure of the present invention;

Fig. 2 is acousto-optic tunable filter cascade light-dividing principle figure in the present invention;

Fig. 3 is acousto-optic tunable filter cascade dispersion implementation procedure block diagram.

Number in the figure explanation: 1, the first optical system, the 2, second optical system, the 3, the 3rd optical system, 11, acousto-optic tunable filter, 12, accurate radio driver, 13, the secondary dispersion element, 21, the first diaphragm, 22, the polarizer, the 23, first collimation lens, 24, the second diaphragm, the 25, first condenser lens, 31,0 grades of light shielding plates, 32, the 3rd diaphragm, the 33, second collimation lens, the 34, the 4th diaphragm, 41, the 5th diaphragm, the 42, second condenser lens.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

Acousto-optic tunable filter cascade dispersion system, comprise the first optical system 1, described the first optical system 1 transmits light to acousto-optic tunable filter 11, described acousto-optic tunable filter 11 is connected with accurate radio driver 12, described acousto-optic tunable filter 11 transmits light to the second optical system 2, described the second optical system 2 transmits light to secondary dispersion element 13, and described secondary dispersion element 13 transmits light to the 3rd optical system 3.

When described acousto-optic tunable filter 11 is inputted the narrow radio frequency signal of n different center frequency by described accurate radio driver 12 simultaneously, but the narrow band light of n the centre wavelength that conllinear output and input radio frequency signal center frequency are complementary.

Described accurate radio driver 12 can be simultaneously or the narrow radio frequency signal of n different center frequency of timesharing output.And the output of n passage radiofrequency signal is separate, and radio-frequency power is adjustable, independently continuous or discontinuous variation of rf frequency.

Further, described the first optical system 1 comprises the first diaphragm 21, the polarizer 22, the first collimation lens 23, the second diaphragm 24 and the first condenser lens 25, described the first diaphragm 21, the described polarizer 22, described the first collimation lens 23, described the second diaphragm 24 and described the first condenser lens 25 centers are on same axis, described the first diaphragm 21 and described the second diaphragm 24 are aperture or slit, and the 1st optical system realizes that light signal rises partially, shaping, collimation or assemble input acousto-optic tunable filter 11.

Further, described the second optical system 2 comprises 0 grade of light shielding plate 31, the 3rd diaphragm 32, the second collimation lens 33 and the 4th diaphragm 34, described the 3rd diaphragm 32 and described the 4th diaphragm 34 are aperture or slit, and described the second optical system realizes that the collimation of described acousto-optic tunable filter 11 conllinear output signals inputs described the second optical system.

Further, described the 3rd optical system 3 comprises the 5th diaphragm 41 and the second condenser lens 42, described the 5th diaphragm 41 is aperture or slit, and described the 3rd optical system realizes described acousto-optic tunable filter 11 cascade dispersion system narrow band light spaces separation outputs.The aperture angle of described the second condenser lens 42 is greater than the emergence angle that described secondary dispersion element 13 focuses on the wave band dispersion at it, to guarantee same segmentation spectral signal, through same condenser lens, collects.

Further, described secondary dispersion element 13 is prism or grating, described secondary dispersion element 13 can be non-colinear n centre wavelength narrow band light by the narrow band light dispersion of n the centre wavelength by described acousto-optic tunable filter 11 conllinear outputs, described secondary dispersion element 13 dispersion interaction directions and described acousto-optic tunable filter 11 narrow band light conllinear exit direction quadratures.

Shown in Fig. 1, the polychromatic light sent from light source filters through the first diaphragm 21 light that does not meet paraxial condition.Light becomes the polarized light consistent with AOTF maximizing efficiency direction by the polarizer 22.The first collimation lens 23 is transformed into directional light by incident light, through the second diaphragm 24, filters spurious rays, by the first condenser lens 25, assembles and enters the AOTF window.Accurate radio driver 12 output frequencies are accurate, the driving signal of power stability, generate ultrasonic signal through transducer and inject acousto-optic crsytal.Light is subject to diffraction and realizes the spectrum light splitting in the acousto-optic crsytal of AOTF.When injecting narrow radio frequency driving signal, can obtain 1 grade of arrowband diffraction light signal and deviate from 0 grade of light.0 grade of light is absorbed by 0 grade of light shielding plate.1 grade of arrowband diffraction light filters parasitic light through the 3rd diaphragm 32, by the second collimation lens 33, is converted to after directional light and is being filtered parasitic light input secondary dispersion element through the 4th diaphragm 34.

As shown in Figure 2, when injecting n narrow radio frequency driving signal, can obtain n 1 grade of arrowband diffraction light of conllinear output simultaneously.Dispersion occurs in n 1 grade of arrowband diffraction light conllinear while being input to secondary dispersion element 13, n narrow band light exported because 2 discrete n of being of dispersion interaction restraint narrow band light.

Improve the mechanism of acousto-optic spectroscopic analysis methods sweep velocity.The arrowband light wave of AOTF separable and its frequency dependence under radio frequency signals drive.But because the acousto-optic response time depends on that in acousto-optic crsytal, sound wave forms the action time of periodic refractive index in crystal, so the acousto-optic response time is closely relevant with the crystal velocity of sound.Its realization flow as shown in Figure 3, comprises the following steps:

Step 1) is determined spectral range to be measured and resolution;

Step 2) determine radio frequency reading scope and radio frequency stepping;

Step 3) determines that spectral measurement cuts apart hop count n and end points wavelength;

Step 4) is searched device optical wavelength and rf frequency mapping table, determines each end points rf frequency;

Step 5) is inputted the n road and be take the radiofrequency signal that the end points rf frequency is starting point in the AOTF device, simultaneously to determine order and step-scan;

Step 6) is measured respectively n road secondary dispersed light beam light intensity;

Step 7) is searched mapping table and is described segmentation spectrum with analyzing spot;

Step 8) n section spectrum splices synthetic whole section spectrum from beginning to end.

Take tellurium dioxide as example, and the intracrystalline velocity of sound is about 650 meter per seconds.Quantizing process is exemplified below:

When the optical effect length of crystal is 10mm, the response time of device is 0.01 meter and is about 15 microseconds second divided by 650 meter per seconds=1.54e-5.Hypothetical target measure spectrum width is 400-640nm, and resolution is 4 nanometers, needs altogether 60 points of sampling to complete the spectral measurement process one time.The input radio frequency frequency is the step change with 1MHz from 140MHz-80MHz, and the acousto-optic response time of the point of sampling is 15 microseconds.Required time is 60 * 15 microseconds=900 microseconds.

With the method for the invention, establish the radio-frequency (RF) driving signal of input simultaneously and count n=6.6 channels drive signal frequencies are made as to 140MHz, 130MHz, 120MHz, 110MHz, 100MHz, 90MHz and successively decrease with the stepping of 1MHz, the acousto-optic response time of 6 points of sampling is still 15 microseconds, required time only is required to be 10 * 15=150 microsecond, is 1/6 of the simple scan detection method used time.

Many signals input capability of current commercial AOTF device can reach 8 and drive the signal acting in conjunction in the AOTF device, makes it to export the arrowband collinear signal of 8 bundle different wave lengths.After 8 road conllinear output beams are by the dispersion of secondary dispersion element, will form 8 each independently hot spot be detected device and survey, be equivalent to 8 road parallel measurements, acousto-optic scanning response process time shorten is 1/8.

Claims (5)

1. acousto-optic tunable filter cascade dispersion system, it is characterized in that: comprise the first optical system (1), described the first optical system (1) transmits light to acousto-optic tunable filter (11), described acousto-optic tunable filter (11) is connected with accurate radio driver (12), described acousto-optic tunable filter (11) transmits light to the second optical system (2), described the second optical system (2) transmits light to secondary dispersion element (13), and described secondary dispersion element (13) transmits light to the 3rd optical system (3).
2. acousto-optic tunable filter cascade dispersion system according to claim 1, it is characterized in that: described the first optical system (1) comprises the first diaphragm (21), the polarizer (22), the first collimation lens (23), the second diaphragm (24) and the first condenser lens (25), described the first diaphragm (21), the described polarizer (22), described the first collimation lens (23), described the second diaphragm (24) and described the first condenser lens (25) center are on same axis, described the first diaphragm (21) and described the second diaphragm (24) are aperture or slit.
3. acousto-optic tunable filter cascade dispersion system according to claim 1, it is characterized in that: described the second optical system (2) comprises 0 grade of light shielding plate (31), the 3rd diaphragm (32), the second collimation lens (33) and the 4th diaphragm (34), and described the 3rd diaphragm (32) and described the 4th diaphragm (34) are aperture or slit.
4. acousto-optic tunable filter cascade dispersion system according to claim 1, it is characterized in that: described the 3rd optical system (3) comprises the 5th diaphragm (41) and the second condenser lens (42), described the 5th diaphragm (41) is aperture or slit.
5. acousto-optic tunable filter cascade dispersion system according to claim 1, it is characterized in that: described secondary dispersion element (13) is prism or grating.
CN201310375065XA 2013-08-26 2013-08-26 Cascading chromatic dispersion system for acousto-optic tunable filter CN103453988A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106441581A (en) * 2016-09-19 2017-02-22 华中科技大学 High-resolution linear array CCD direct-reading type spectrometer

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Publication number Priority date Publication date Assignee Title
US5946128A (en) * 1997-08-15 1999-08-31 The United States Of America As Represented By The Secretary Of Commerce Grating assisted acousto-optic tunable filter and method
CN101871815A (en) * 2009-04-24 2010-10-27 中国科学院西安光学精密机械研究所 Programmable polarization hyperspectral imager based on aperture segmentation and acoustic-optic tunable filter
CN102507006A (en) * 2011-12-20 2012-06-20 中国兵器工业第二○五研究所 Acousto-optic tunable filter-based infrared differential hyperspectral imaging device
CN203465000U (en) * 2013-08-26 2014-03-05 中国科学院苏州生物医学工程技术研究所 Acousto-optic tunable filter cascade chromatic dispersion system

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Publication number Priority date Publication date Assignee Title
US5946128A (en) * 1997-08-15 1999-08-31 The United States Of America As Represented By The Secretary Of Commerce Grating assisted acousto-optic tunable filter and method
CN101871815A (en) * 2009-04-24 2010-10-27 中国科学院西安光学精密机械研究所 Programmable polarization hyperspectral imager based on aperture segmentation and acoustic-optic tunable filter
CN102507006A (en) * 2011-12-20 2012-06-20 中国兵器工业第二○五研究所 Acousto-optic tunable filter-based infrared differential hyperspectral imaging device
CN203465000U (en) * 2013-08-26 2014-03-05 中国科学院苏州生物医学工程技术研究所 Acousto-optic tunable filter cascade chromatic dispersion system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106441581A (en) * 2016-09-19 2017-02-22 华中科技大学 High-resolution linear array CCD direct-reading type spectrometer

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