CN102213845B - Acousto-optic adjustable light filter with broadband - Google Patents
Acousto-optic adjustable light filter with broadband Download PDFInfo
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- CN102213845B CN102213845B CN 201110158968 CN201110158968A CN102213845B CN 102213845 B CN102213845 B CN 102213845B CN 201110158968 CN201110158968 CN 201110158968 CN 201110158968 A CN201110158968 A CN 201110158968A CN 102213845 B CN102213845 B CN 102213845B
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Abstract
The invention relates to an acousto-optic adjustable light filter with broadband, which comprises an acousto-optic medium, wherein the acousto-optic medium is installed on a base; at least two transducers are installed on the surface of the acousto-optic medium; the surface of each transducer is plated with a surface electrode; each surface electrode is respectively connected with a matching network; the matching network is connected with a high-frequency socket; all the transducers are installed on the same surface of the acousto-optic medium through a linking layer; and the thicknesses of the transducers with each surface electrode are different. Because the two transducers are installed on the same side of the acousto-optic medium, the problem that the clamp is easy to damage the transducer which is installed in the front when the transducers are installed on the two surfaces of the traditional acousto-optic medium, thereby enhancing the finished product rate of products; and the transducers with different thicknesses drive the radio frequency signals with different frequencies, thereby obtaining the diffraction light with different wavelengths.
Description
Technical field
The present invention relates to acousto-optical device, especially a kind of broadband acousto-optic turnable filter that is used for laser system, is fit to light spectrum image-forming or spectral analysis belongs to the acousto-optic Instrument technology field.
Background technology
The acousto-optic turnable filter that light spectrum image-forming or spectral analysis are used; Mainly constitute by acousto-optic medium, transducer, table electrode, printed board, matching network and high-frequency socket; High-frequency socket is connected with matching network through lead-in wire; The table electrode is located at transducer face, and matching network is connected with table electrode on the transducer through printed board, is connected through bonded layer between acousto-optic medium and the transducer.Radiofrequency signal is transferred on the transducer table electrode through high-frequency socket, matching network, transition circuit board, spun gold (or Si-Al wire); Transducer is converted into ultrasonic transmission to radiofrequency signal in the acoustic optic interaction medium; In medium, form refractive-index grating; Incident light and refractive-index grating generation acoustic optic interaction produce diffraction light.The spectral characteristic of diffraction light and the frequency spectrum of radiofrequency signal have corresponding relation.The radiofrequency signal of input different frequency, transducer just produces the ultrasound wave of corresponding frequencies, obtains the diffraction light of respective wavelength.
In order to obtain the diffraction light in broadband, solve the big inadequately problem of bandwidth of operation of single transducer, method commonly used is on two relative faces of acousto-optic medium, to make two transducers.Since when making second transducer, first transducer of as easy as rolling off a log injury, so the finished product rate is very low.
In order to improve the bandwidth of operation of transducer, matching network commonly used is the multistage matching network that the inductance series connection by a plurality of manual coilings constitutes, because the inductance parameters discrete type of manual coiling is bigger, is not easy control, and it is big to cause mating work difficulty.
Summary of the invention
Above-mentioned deficiency to prior art exists the purpose of this invention is to provide the high broadband acousto-optic turnable filter of a kind of yield rate, and this broadband acousto-optic turnable filter also has radiofrequency signal and evenly is transferred on the transducer, obtains uniform diffraction light; The advantage that the matching network work difficulty is little.
The technological means that the present invention addresses the above problem is such: a kind of broadband acousto-optic turnable filter; Comprise acousto-optic medium; Acousto-optic medium is installed on the base, and the acousto-optic medium mounted on surface has at least two transducers, and each transducer face all has been coated with the table electrode; Each is shown electrode and is connected with matching network respectively; Matching network is connected with high-frequency socket, it is characterized in that: all transducers all are installed in the same surface of acousto-optic medium through bonded layer, and it is all inequality that each shows the transducer thickness at electrode place.
Further; Each is shown electrode and is connected with matching network through the transition circuit board respectively; The transition circuit board is bonded in respectively on the corresponding transducer; Matching network is connected with the transition circuit board through lead-in wire, and the transition circuit board is connected with the table electrode through many spun gold or the Si-Al wires of evenly arranging, the distance of adjacent two spun golds or Si-Al wire is no more than 2 millimeters.
Further, said matching network mainly is made up of first capacitor C 1, second capacitor C 2 and 3 series connection of the 3rd capacitor C, and first capacitor C 1 is connected with high-frequency socket through lead-in wire, and the 3rd capacitor C 3 is passed through to go between and is connected with the transition circuit board; On the lead-in wire between the high-frequency socket and first capacitor C 1, be provided with first inductance L 1 over the ground; On the connecting line between first capacitor C 1 and second capacitor C 2, be provided with second inductance L 2 over the ground; On the connecting line between second capacitor C 2 and the 3rd capacitor C 3, be provided with the first ground capacitance C4, on the lead-in wire between the 3rd electric capacity and the transition circuit board, be provided with the second ground capacitance C5.
The bottom surface of said acousto-optic medium is bonding through silicon rubber and base with one of them side, and the surface of acousto-optic medium is bonding through silicon rubber and cover plate.
Said table electrode, matching network and high-frequency socket are corresponding two, and one of them matching network is positioned at base, and corresponding high-frequency socket is installed on the base; Another matching network is positioned at cover plate, and corresponding high-frequency socket is installed on the cover board, and the transducer difference in thickness at two table electrode places is greater than 30%.
Said acousto-optic medium is a tellurium oxide crystal.
Compare prior art, good effect of the present invention is:
1, in the same side of acousto-optic medium two transducers are installed, have been solved and traditional on two faces of acousto-optic medium, transducer has been installed, anchor clamps very easily damage the problem of the transducer of installing the front, have improved the yield rate of product.
2, on transducer, be pasted with the transition circuit board, be convenient to the transmission of signal.
3, the transition circuit board is connected with many spun golds (or Si-Al wire) between the electrode with table, is convenient to radiofrequency signal and evenly is transferred on the transducer, obtains uniform diffraction light.
4, broadband matching network is three grades of broadband matching networks, makes the internal resistance conjugate complex number each other of input impedance and the signal source of transmission line, makes the power of signal source be output as maximum, and signal transmission attenuation and distortion are minimum, are convenient to the transmission of broadband rf signal.
5, acousto-optic medium is bonding through silicon rubber and base, cover plate, can effectively improve the ability of device anti-vibrating and impact and temperature variation.
6, a plurality of transducer thickness are different, and on the transducer of different-thickness, have been coated with the table electrode, and the radiofrequency signal of the transducer drive different frequency of different-thickness obtains the diffraction light of different wave length.
Description of drawings
Fig. 1-structural representation of the present invention.
The A-A view of Fig. 2-Fig. 1.
The circuit theory diagrams of Fig. 3-matching network.
Embodiment
Below in conjunction with specific embodiment the present invention is done further explain.
As depicted in figs. 1 and 2, broadband of the present invention acousto-optic turnable filter comprises base 1, is pasted with the acousto-optic medium 2 of rectangular parallelepiped through silicon rubber 9 on base 1 top, through bonded layer 8 at least two transducers is installed in the same side of acousto-optic medium 2.Following structure describes plural similar with two transducers.The first high-frequency socket 3-1 wherein also is installed on base 1; The first matching network 5-1 is installed in the base 1; The external high-frequency input signal of this first high-frequency socket 3-1, in connect the first matching network 5-1 input end, the output terminal of this first matching network 5-1 through first the lead-in wire 11-1 be connected with the first transition circuit board 7-1; This first transition circuit board 7-1 sticks on the first transducer 6-1 with silicon rubber 9; Be coated with the first table electrode 10-1 on the surface of this first transducer 6-1, the first transition circuit board 7-1 is connected with many spun gold or the Si-Al wires of evenly arranging 12 with the first table electrode 10-1, and the distance of adjacent two spun golds or Si-Al wire 12 is no more than 2 millimeters.
Be bonded with cover plate 4 at acousto-optic medium 2 tops through silicon rubber 9; The second high-frequency socket 3-2 is installed on cover plate 4; The second matching network 5-2 is installed in cover plate 4; The external high-frequency input signal of the second high-frequency socket 3-2, in connect the second matching network 5-2 input end, the output terminal of this second matching network 5-2 through second the lead-in wire 11-2 be connected with the second transition circuit board 7-2; This second transition circuit board 7-2 sticks on the second transducer 6-2 with silicon rubber 9; Be coated with the second table electrode 10-2 on the surface of this second transducer 6-2, the second transition circuit board 7-2 is connected with many spun gold or the Si-Al wires of evenly arranging 12 with the second table electrode 10-2, and the distance of adjacent two spun golds or Si-Al wire 12 is no more than 2 millimeters equally.
The first matching network 5-1 and the second matching network 5-2 are three grades of matching networks of same structure; As shown in Figure 3; This matching network mainly is made up of first capacitor C 1, second capacitor C 2 and 3 series connection of the 3rd capacitor C; First capacitor C 1 is connected with high-frequency socket through lead-in wire, and the 3rd capacitor C 3 is connected with the transition circuit board through lead-in wire; On the lead-in wire between the high-frequency socket and first capacitor C 1, be provided with first inductance L 1 over the ground; On the connecting line between first capacitor C 1 and second capacitor C 2, be provided with second inductance L 2 over the ground; On the connecting line between second capacitor C 2 and the 3rd capacitor C 3, be provided with the first ground capacitance C4, on the lead-in wire between the 3rd electric capacity and the transition circuit board, be provided with the second ground capacitance C5.First capacitor C 1, first over the ground inductance L 1 and second over the ground inductance L 2 form first order π shape matching networks; Second capacitor C 2 and the first ground capacitance C4, the 3rd capacitor C 3 and the second ground capacitance C5 form the L shaped matching network in the second level, the L shaped matching network of the third level respectively.These three grades of matching networks are used for the conjugate impedance match of signal source and load, make the internal resistance conjugate complex number each other of input impedance and signal source of transmission line to make the power of signal source be output as maximum, and signal transmission attenuation and distortion are minimum.
Acousto-optic medium 2 is a tellurium oxide crystal, and it is bonding with base 1 and cover plate 4 through silicon rubber 9, and this silicon rubber 9 is 703 glue, and the thickness of silicon rubber 9 is 100 microns ± 50 microns.
On the first transducer 6-1, the second transducer 6-2, paste the transition circuit board, so that the transmission of signal.Though the branch of first transducer, second transducer is arranged in the statement; But reality is processed with a transducer for easy to process; Just be coated with table electrode (embodiment is two) at the transducer diverse location, the transducer thickness at two table electrode places is inequality, and difference in thickness is greater than 30%.
Principle of work: radiofrequency signal is transferred on the lead-in wire through the matching network in the printed board through high-frequency socket; Be transferred on the table electrode through transition circuit board, spun gold again; Transducer between table electrode and the bonded layer absorbs radiofrequency signal, and is converted into ultrasonic transmission to radiofrequency signal in acousto-optic medium, in acousto-optic medium, forms refractive-index grating; Have only the light of specific wavelength to pass acousto-optic medium and refractive-index grating generation acoustic optic interaction, produce diffraction light.
The transducer thickness at two table electrode places is inequality, its objective is that the transducer drive of different-thickness produces the radiofrequency signal of different frequency, obtains the diffraction light of different wave length, is fit to be operated on the different frequency bands.Transducer thickness like one of them table electrode place is 16 microns, and bandwidth of operation is 120MHz～180MHz; The transducer thickness at another table electrode place is 26 microns, and bandwidth of operation is 64MHz～120MHz.In the same side of acousto-optic medium 2 two transducers are installed, have been solved and traditional on 2 two faces of acousto-optic medium, transducer has been installed, anchor clamps very easily damage the problem of the transducer of installing the front, have improved the finished product rate, thereby have reduced production cost.
Transition circuit board and table electrode with many evenly the spun gold or the Si-Al wires 12 of layouts be connected, the distance of adjacent two spun golds or Si-Al wire 12 is no more than 2 millimeters, this helps radiofrequency signal and evenly is transferred on the transducer, obtains uniform diffraction light;
On base and cover plate each design and installation matching network, increased the space that matched element is installed, reduced the volume and weight of device.
The above embodiment of the present invention only be for explanation the present invention did for example, and be not to be qualification to embodiment of the present invention.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation and changes.Here can't give exhaustive to all embodiments.Everyly belong to the row that conspicuous variation that technical scheme of the present invention amplifies out or change still are in protection scope of the present invention.
Claims (3)
1. the broadband acousto-optic turnable filter comprises acousto-optic medium, and acousto-optic medium is installed on the base; The acousto-optic medium mounted on surface has at least two transducers; Each transducer face all has been coated with the table electrode, and each is shown electrode and is connected with matching network respectively, and matching network is connected with high-frequency socket; It is characterized in that: all transducers all are installed in the same surface of acousto-optic medium through bonded layer, and it is all inequality that each shows the transducer thickness at electrode place;
Each is shown electrode and is connected with matching network through the transition circuit board respectively; The transition circuit board is bonded in respectively on the corresponding transducer; Matching network is connected with the transition circuit board through lead-in wire; The transition circuit board is connected with the table electrode through many spun gold or the Si-Al wires of evenly arranging, the distance of adjacent two spun golds or Si-Al wire is no more than 2 millimeters;
The bottom surface of said acousto-optic medium is bonding through silicon rubber and base with one of them side, and the surface of acousto-optic medium is bonding through silicon rubber and cover plate;
Said table electrode, matching network and high-frequency socket are corresponding two, and one of them matching network is positioned at base, and corresponding high-frequency socket is installed on the base; Another matching network is positioned at cover plate, and corresponding high-frequency socket is installed on the cover board, and the transducer difference in thickness at two table electrode places is greater than 30%.
2. broadband according to claim 1 acousto-optic turnable filter; It is characterized in that: said matching network mainly is made up of first capacitor C 1, second capacitor C 2 and 3 series connection of the 3rd capacitor C; First capacitor C 1 is connected with high-frequency socket through lead-in wire, and the 3rd capacitor C 3 is connected with the transition circuit board through lead-in wire; On the lead-in wire between the high-frequency socket and first capacitor C 1, be provided with first inductance L 1 over the ground; On the connecting line between first capacitor C 1 and second capacitor C 2, be provided with second inductance L 2 over the ground; On the connecting line between second capacitor C 2 and the 3rd capacitor C 3, be provided with the first ground capacitance C4, on the lead-in wire between the 3rd electric capacity and the transition circuit board, be provided with the second ground capacitance C5.
3. broadband according to claim 1 acousto-optic turnable filter is characterized in that, said acousto-optic medium is a tellurium oxide crystal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158968 CN102213845B (en) | 2011-06-14 | 2011-06-14 | Acousto-optic adjustable light filter with broadband |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158968 CN102213845B (en) | 2011-06-14 | 2011-06-14 | Acousto-optic adjustable light filter with broadband |
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| CN102213845B true CN102213845B (en) | 2012-10-03 |
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| CN102902083B (en) * | 2012-11-15 | 2016-03-09 | 中国电子科技集团公司第二十六研究所 | There is the non-acousto-optic turnable filter in the same way of wide spectral |
| CN103116227A (en) * | 2013-01-30 | 2013-05-22 | 福建福晶科技股份有限公司 | Acousto-optic device enabling packaging quality to be easy to detect |
| CN104635361B (en) * | 2015-03-06 | 2017-06-06 | 中国电子科技集团公司第二十六研究所 | Wide spectrum acousto-optic turnable filter |
| CN105319741B (en) * | 2015-12-14 | 2018-04-13 | 福州大学 | 808nm wave band free space acousto-optic polarization control systems |
| CN105388640B (en) * | 2015-12-29 | 2019-08-02 | 中国电子科技集团公司第二十六研究所 | Rhombic transducer device for acousto-optic turnable filter |
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| JP2003344831A (en) * | 2002-05-23 | 2003-12-03 | Sharp Corp | Display device |
| CN2605682Y (en) * | 2003-01-26 | 2004-03-03 | 中国电子科技集团公司第26研究所 | Acousto-optic Q-switch |
| CN2708543Y (en) * | 2004-03-17 | 2005-07-06 | 中国电子科技集团公司第二十六研究所 | Acousto-optic Q switch capable of automatic protection |
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