Resonant piezoelectric acousto-optic light filter and apparatus using same
阅读：591发布：2023-03-27
专利汇可以提供Resonant piezoelectric acousto-optic light filter and apparatus using same专利检索，专利查询，专利分析的服务。并且An acousto-optic light filter is disclosed wherein a radio frequency electric field is employed to excite an acoustic wave in a piezoelectric optically anisotropic medium. The light to be filtered is collinearly diffracted on the acoustic wave to shift light of a first polarization and of a frequency related to the frequency of the acoustic wave, into light of a second polarization. The diffracted light is polarization analyzed to separate light of the second polarization from light of the first polarization. Piezoelectric birefringent crystals are employed for the optically anisotropic medium. Arrays of acoustic resonators are formed by energy trapping in crystalline slabs, such resonators being selectively addressed by applying electric fields to the crystalline slab at the resonant frequency of the selected acoustic resonator. Different overtone resonances of the acoustic resonators are excited to permit the filter to pass light of different frequencies either in time displaced intervals or simultaneously.，下面是Resonant piezoelectric acousto-optic light filter and apparatus using same专利的具体信息内容。
1. An acousto-optic method for filtering light, said method comprising the steps of applying a radio frequency electric field to a piezoelectric optically anisotropic medium to excite an acoustic wave therein at the frequency of the applied radio frequency electric field and at a frequency related to the optical frequency of the light to be filtered, substantially collinearly diffracting an incident light beam on the acoustic wave within the piezoelectric optically anisotropic medium to change light of a first polarization and of the optical frequency of the light to be filtered into light of a second polarization, and analyzing the diffracted light beam to separate light of the second polarization from light of the first polarization, whereby light at the optical frequency related to the frequency of the acoustic wave is filtered from the incident light beam.
2. The method of claim 1 wherein the step of applying the radio frequency electric field to the piezo-electric optically anisotropic medium comprises applying a radio frequency electric potential across a pair of spaced electrodes disposed adjacent to opposite sides of the piezoelectric medium.
3. The method of claim 2 wherein at least one of said electrodes is substantially transparent to the incident light beam, and wherein the step of diffracting the incident light beam on the acoustic wave includes directing the incident light beam through the substantially transparent electrode into the piezoelectric optically anisotropic medium.
4. The method of claim 1 including the step of dimensioning the piezoelectric optically anisotropic medium to have a resonant mode of vibration at the frequency of the applied radio frequency electric field.
5. The method of claim 1 wherein the piezoelectric optically anisotropic medium is a crystal plate of a thickness providing a thickness mode of vibration at the frequency of the applied radio frequency electric field.
6. The method of claim 5 wherein the thickness of the crystal plate is dimensioned to have an overtone thickness mode of vibration at the frequency of the applied radio frequency electric field.
7. The method of claim 6 wherein the step of applying the radio frequency electric field to the piezoelectric optically anisotropic medium comprises sequentially applying a radio frequency electric field of different frequencies corresponding to the frequencies of different overtone thickness modes of vibration of the crystal plate to the crystal plate to sequentially excite different overtones of the crystal plate and thereby sequentially diffract light of correspondingly different optical frequencies from the first polarization into the second polarization.
8. The method of claim 5 including the steps of arranging a plurality of such crystal plate vibrators in a spatially separated array and dimensioning each of these crystal plate vibrators for a thickness mode of vibration at a different frequency, directing the light to be filtered into the array of crystal plate vibrators, applying the radio frequency Electric field to the array of crystal plate vibrators, and varying the frequency of the applied radio frequency electric field to excite resonance of different ones of the array of crystal plate vibrators in accordance with the frequency of the applied radio frequency electric field and thereby produce a corresponding spatial separation of the light diffracted from the first polarization into the second polarization.
9. The method of claim 8 wherein the crystal plate vibrators are arrayed in an ordered matrix according to an ascending or descending order of resonant vibration frequency.
10. The method of claim 8 wherein the crystal plate vibrators are formed in a common crystalline plate and are each spaced from adjacent crystal plate vibrators by regions of the crystalline plate that are cut-off for the frequencies of the resonant modes of the adjacent crystal plate vibrators to provide energy trapping in each crystal plate vibrator excited by a radio frequency electric field at a resonant frequency of the excited crystal plate vibrator.
11. The method of claim 4 including the step of positioning the piezoelectric optically anisotropic medium in a light path within an optical resonator for filtering light within this light path of the optical resonator.
12. An acousto-optic method for filtering light, said method comprising the steps of disposing an array of optically anisotropic acoustic resonators in the path of the light to be filtered, such resonators being arrayed in a plane generally transverse to the path of the light to be filtered, exciting one or more of the acoustic resonators into resonance for diffracting light of a first polarization and of an optical frequency related to an acoustic resonance frequency of each excited acoustic resonator into light of a second polarization, and polarization analyzing the diffracted light to separate the light of the first polarization from the light of the second polarization.
13. The method of claim 12 wherein the acoustic resonators are crystal vibrators, and wherein the method includes the steps of arranging the crystal vibrators in a common crystalline slab, dimensioning each of the crystal vibrators for a thickness mode of vibration at a different frequency such that the crystal vibrators are addressable by different frequencies of excitation, and dimensioning the regions of the common crystalline slab surrounding each crystal vibrator to trap acoustic energy at a resonant frequency of the respective crystal vibrator when it is excited.
14. An acousto-optic filter for filtering light, said filter comprising a piezoelectric optically anisotropic medium, means for applying a radio frequency electric field to the piezoelectric optically anisotropic medium to excite an acoustic wave therein at the frequency of the applied radio frequency electric field and at a frequency related to the optical frequency of the light to be filtered, said piezoelectric optically anisotropic medium being disposed for substantially collinearly diffracting an incident light beam on the acoustic wave therein to change light of a first polarization and of the optical frequency of the light to be filtered into light of a second polarization, and means for analyzing the diffracted light beam to separate light of the second polarization from light of the first polarization, whereby light at the optical frequency related to the frequency of the acoustic wave is filtered from the incident light beam.
15. The filter of claim 14 wherein said means for applying the radio frequency electric field to the piezoelectric optically anisotropic medium includes a pair of spaced electrodes disposed adjacent to opposite sides of the piezoelectric optically anisotropic medium.
16. The filter of claim 15 wherein at least one of said electrodes is substantially transparent to the incident light beam, and said piezoelectric optically anisotropic medium is disposed relative to the incident light beam for directing the incident light beam through the subsTantially transparent electrode into the piezoelectric optically anisotropic medium.
17. The filter of claim 14 wherein said piezoelectric optically anisotropic medium is dimensioned to have a resonant mode of vibration at the frequency of the applied radio frequency electric field.
18. The filter of claim 17 wherein said piezoelectric optically anisotropic medium is a crystal plate having a thickness dimensioned to provide a thickness mode of vibration at the frequency of the applied radio frequency electric field.
19. The filter of claim 18 wherein the thickness of said crystal plate is dimensioned to have an overtone thickness mode of vibration at the frequency of the applied radio frequency electric field.
20. The filter of claim 19 wherein said means for applying a radio frequency electric field to the piezoelectric optically anisotropic medium includes means for sequentially generating and applying radio frequency electric fields of different frequencies corresponding to the frequencies of different overtone thickness modes of vibration of the crystal plate to the crystal plate to sequentially excite different overtones of the crystal plate and thereby sequentially diffract light of correspondingly different optical frequencies from the first polarization into the second polarization.
21. The filter of claim 18 including a plurality of such crystal plate vibrators arranged in a spatially separated array disposed so that the light to be filtered is directed into the array of crystal plate vibrators, each of the crystal plate vibrators being dimensioned for a thickness mode of vibration at a different frequency, means for applying a radio frequency electric field to the array of crystal plate vibrators, and means for varying the frequency of the applied radio frequency electric field to excite resonance of different ones of the array of crystal plate vibrators in accordance with the frequency of the applied radio frequency electric field to produce a corresponding spatial separation of the light diffracted from the first polarization into the second polarization.
22. The filter of claim 21 wherein said crystal plate vibrators are arrayed in an ordered matrix according to an ascending or descending order of resonant vibration frequency.
23. The filter of claim 21 wherein said crystal plate vibrators are formed in a common crystalline plate, each of said crystal plate vibrators being spaced from adjacent crystal plate vibrators by regions of the common crystalline plate that are cut-off for the frequencies of the resonant modes of the adjacent crystal plate vibrators to provide energy trapping in each crystal plate vibrator excited by a radio frequency electric field at a resonant frequency of the excited crystal plate vibrator.
24. The filter of claim 17 including an optical resonator, said piezoelectric optically anisotropic medium being disposed in a light path within the optical resonator for filtering light within this light path of the optical resonator.
25. An acousto-optic filter for filtering light, said filter comprising an array of optically anisotropic acoustic resonators, said acoustic resonators being disposed in the path of the light to be filtered and being arranged in a plane generally transverse to the direction of the light to be filtered, means for exciting one or more of the acoustic resonators into resonance for diffracting light of a first polarization and of an optical frequency related to an acoustic resonance frequency of each excited acoustic resonator into light of a second polarization, and means for analyzing the polarization of the diffracted light to separate the light of the first polarization from the light of the second polarization.
26. The filter of claim 25 wherein said acoustic resonators are crystal vibrators arranged in a common crystalline slab, each of said crystal vibrators is dimensioned for a thickness mode of vibration at a different frequency such that the crystal vibrators are addressable by difFerent frequencies of excitation, and said common crystalline slab is dimensioned in the regions between adjacent crystal vibrators to trap exciting energy at a resonant frequency of each crystal vibrator when it is excited.
27. An acousto-optic filter for filtering light, said filter comprising a piezoelectric optically anisotropic medium disposed to receive an incident light beam having a first predetermined polarization, said piezoelectric optically anisotropic medium being selected and arranged to propagate the incident light beam as a particular wave in a birefringent system and being further capable of diffracting and propagating a light beam of orthogonal polarization to the incident light beam as another wave in the birefringent system in response to acoustic waves excited within the piezoelectric optically anisotropic medium, means for coupling radio frequency electric fields into the piezoelectric optically anisotropic medium to develop acoustic waves of a predetermined frequency therein, the frequency of the acoustic waves being selected to define a phase-matched relationship such that the vector sum of the momentum vectors of the incident light beam and the acoustic waves is equal to the momentum vector of a resultant output light beam orthogonally oriented to the incident light beam, whereby the incident light beam satisfying that condition for an acoustic wave of the predetermined frequency is diffracted into said orthogonal polarization, and means for analyzing the diffracted light beam to separate light of said orthogonal polarization from light of said first predetermined polarization, whereby light of said orthogonal polarization is filtered from the incident light beam.
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