CN110672566A - Method for detecting stimulated Brillouin scattering acoustic photonic crystal structure in water - Google Patents
Method for detecting stimulated Brillouin scattering acoustic photonic crystal structure in water Download PDFInfo
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- CN110672566A CN110672566A CN201910992497.2A CN201910992497A CN110672566A CN 110672566 A CN110672566 A CN 110672566A CN 201910992497 A CN201910992497 A CN 201910992497A CN 110672566 A CN110672566 A CN 110672566A
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Abstract
The invention discloses a method for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water. The method mainly amplifies weak light beams through the internal structure of a stimulated Brillouin scattering medium. The stimulated Brillouin scattering at the focus enables the medium to generate an acousto-optic crystal structure, weak light beams are incident on the acousto-optic crystal structure, signals obtained through measurement are amplified due to the amplification effect of the acousto-optic crystal on light beam signals, and the existence of the acousto-optic crystal is verified to generate the stimulated Brillouin scattering. The invention has the advantages that: and the generated acousto-optic crystal structure is utilized to amplify the weak light beam, so that the existence of the acousto-optic crystal is verified.
Description
Technical Field
The invention relates to a method for detecting an acousto-optic photonic crystal structure, in particular to a method for detecting a stimulated Brillouin scattering acousto-optic photonic crystal structure in water.
Background
The method for detecting the acousto-optic photonic crystal structure mainly amplifies weak light beams through generating a structure in a stimulated Brillouin scattering medium. Stimulated Brillouin scattering has a wide application prospect in the field of underwater detection and remote sensing, but the research on the physical model that the generated stimulated Brillouin scattering is the medium internal refractive index distribution is not reported, and the refractive index distribution model used at the present stage is lack of corresponding micro description. The method provides a technical means for researching the internal microstructure generating the stimulated Brillouin scattering, finally obtains the image of the stimulated Brillouin scattering acousto-optic crystal structure, performs the specific distribution condition of the refractive index distribution in the medium during the generation of the stimulated Brillouin scattering in a reverse manner, and further verifies the existence of the acousto-optic crystal.
Disclosure of Invention
The invention aims to provide a method for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water. Because the stimulated Brillouin scattering generates an acousto-optic crystal structure in the medium, the generated structure is detected by weak beams, and the detection result shows that signals of the weak beams are amplified, so that the acousto-optic crystal structure generated in the medium can be obtained.
The invention adopts the following technical scheme: a method for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water comprises the specific process of signal amplification, wherein the specific process of signal amplification is that a seed is injected with a pulse Nd: YAG laser emits laser beam with wavelength of 532nm, vertical polarization is changed into horizontal by a lambda/2 wave plate, the laser beam is changed into natural polarization by a 95% spectroscope and a polarization spectroscope by a lambda/4 wave plate, the laser beam is focused into a sample pool by a focusing system, a back scattering signal passes through a reflector, the laser beam is filtered by a convex lens I, a diaphragm I and a concave lens, and an F-P etalon finally reaches ICCD to receive the signal and display the signal in a computer;
the other weak light beam is focused to a Brillouin scattering area through a reflector, a convex lens II, a diaphragm II, a convex lens III, a reflector, a convex lens IV and a convex lens V, a forward signal reaches a detector through an F-P scanning etalon, wherein an F-P scanning etalon controller controls the F-P scanning etalon, a driver simultaneously drives the F-P scanning etalon controller and the F-P scanning etalon, a photon information acquisition card simultaneously controls the F-P scanning etalon controller, the F-P scanning etalon and the detector, and the final signal is displayed on a computer.
The experimental detection device using the method comprises a seed injection pulse Nd: YAG laser, lambda/2 wave plate, 95% spectroscope, polarization spectroscope 04, lambda/4 wave plate, focusing system, sample cell, reflector, convex lens I, diaphragm I, concave lens, F-P etalon, ICCD, computer, reflector, convex lens II, diaphragm II, convex lens III, reflector, convex lens IV, convex lens V, F-P scanning etalon, detector, F-P scanning etalon controller, driver, photon information collecting card and computer.
Further, a seed injection pulse Nd with an output wavelength of 532nm is adopted: the YAG laser (01) generates a stimulated Brillouin scattering acousto-optic crystal structure, and amplifies weak light beams through the signal amplification effect of the acousto-optic crystal structure.
The method adopts the generated acousto-optic crystal structure to detect, utilizes the stimulated Brillouin system generation device to generate the acousto-optic crystal structure in the medium, and is characterized in that the generated acousto-optic photonic crystal structure is verified by detecting the amplification effect of the acousto-optic crystal structure in water on weak light beams, a verification is carried out on an internal mechanism for generating stimulated Brillouin scattering, and a stimulated Brillouin scattering acousto-optic crystal structure image is finally obtained, so that a refractive index distribution microstructure image of water is obtained through calculation, the stimulated Brillouin scattering microstructure distribution in water is further obtained, the blank in the aspect of a stimulated Brillouin scattering physical mechanism is filled, and the technology has potential physical value.
The invention utilizes the stimulated Brillouin system generation device to enable the medium to generate nonlinear change, generate the acousto-optic photonic crystal structure, mainly detect the generated acousto-optic crystal structure and verify the accuracy of the acousto-optic crystal model generated by stimulated Brillouin scattering. The method mainly amplifies weak light beams through the internal structure of a stimulated Brillouin scattering medium. The stimulated Brillouin scattering at the focus enables the medium to generate an acousto-optic crystal structure, weak light beams are incident on the acousto-optic crystal structure, signals obtained through measurement are amplified due to the amplification effect of the acousto-optic crystal on light beam signals, and the existence of the acousto-optic crystal is verified to generate the stimulated Brillouin scattering. And finally, a refractive index distribution structure microscopically established by the stimulated Brillouin scattering can be obtained, and the research result has potential application value in the aspect of a stimulated Brillouin scattering physical mechanism.
The invention has the advantages that: and amplifying the weak light beam by using the generated acousto-optic crystal structure, further verifying the existence of the acousto-optic crystal, and finally calculating to obtain the refractive index structure distribution on the microscopic mechanism of the generated stimulated Brillouin scattering in the water.
Drawings
Fig. 1 is a schematic diagram of the present invention.
FIG. 2 is a structural diagram of an acousto-optic crystal obtained by the present invention.
In the figure: seed injection pulse Nd: YAG laser 01, lambda/2 wave plate 02, 95% spectroscope 03, polarization spectroscope 04, lambda/4 wave plate 05, focusing system 06, sample cell 07, first reflector 08, first convex lens 09, first diaphragm 10, concave lens 11, F-P etalon 12, ICCD13, computer 14, second reflector 15, second convex lens 16, second diaphragm 17, third convex lens 18, third reflector 19, fourth convex lens 20, fifth convex lens 21, F-P scanning etalon 22, detector 23, F-P scanning etalon controller 24, driver 25, photon information acquisition card 26 and computer 27.
Detailed Description
A method for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water comprises the following specific processes of amplifying signals by a semiconductor continuous laser: seed injection pulse Nd: YAG laser 01 emits laser beam with wavelength of 532nm, the vertical polarization is changed into horizontal by lambda/2 wave plate 02, the light beam is changed into natural polarization by 95% spectroscope 03, polarization spectroscope 04 and lambda/4 wave plate 05, the light beam is focused into sample pool 07 by focusing system 06, the back scattering signal passes through reflector 08, the light beam is filtered by convex lens I09, diaphragm 10 and concave lens 11, F-P etalon 12 finally reaches ICCD13 to receive the signal, and the signal is displayed on computer 14. The other weak light beam is focused to a Brillouin scattering area through the reflector 15, the convex lens II 16, the diaphragm 17, the convex lens III 18, the reflector 19, the convex lens IV 20 and the convex lens V21, a forward signal reaches the detector 23 through the F-P scanning etalon 22, the F-P scanning etalon controller 24 controls the F-P scanning etalon 22, the driver 25 drives the F-P scanning etalon controller 24 and the F-P scanning etalon 22 simultaneously, the photon information acquisition card 26 controls the F-P scanning etalon controller 24, the F-P scanning etalon 22 and the detector 23 simultaneously, and the final signal is displayed on the computer 27. The invention relates to a method for directly detecting a stimulated Brillouin scattering transient grating structure based on an optical parametric amplification imaging technology, which is characterized in that the stimulated Brillouin scattering transient grating structure is directly detected by utilizing the optical parametric amplification imaging ultrafast time resolution technology.
Seed injection pulse Nd: YAG laser 01, lambda/2 wave plate 02, 95% spectroscope 03, polarization spectroscope 04, lambda/4 wave plate 05, focusing system 06, sample cell 07, reflecting mirror 08, convex lens I09, diaphragm 10, concave lens 11, F-P etalon 12, ICCD13, computer 14, reflecting mirror 15, convex lens II 16, diaphragm 17, convex lens III 18, reflecting mirror 19, convex lens IV 20, convex lens V21, F-P scanning etalon 22, detector 23, F-P scanning etalon controller 24, driver 25, photon information acquisition card 26 and computer 27.
The invention relates to a device for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water, which is characterized in that a seed injection pulse Nd with the output wavelength of 532nm is adopted: the YAG laser 01 generates a stimulated brillouin scattering acousto-optic crystal structure, and amplifies weak light beams by a signal amplification effect of the acousto-optic crystal structure.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (3)
1. A method for detecting a stimulated Brillouin scattering acoustic photonic crystal structure in water is characterized by comprising the following specific steps of seed injection pulse Nd: YAG laser (01) emits laser beam with wavelength of 532nm, vertical polarization is changed into horizontal through a lambda/2 wave plate (02), the laser beam is changed into natural polarization through a 95% spectroscope (03) and a polarization spectroscope (04) and a lambda/4 wave plate (05), the laser beam is focused into a sample pool (07) through a focusing system (06), a back scattering signal passes through a reflecting mirror (08), the laser beam is filtered through a convex lens I (09), a diaphragm (10) and a concave lens (11), an F-P etalon (12) finally reaches an ICCD (13) to receive the signal, and the signal is displayed on a computer (14);
the other weak light beam is focused to a Brillouin scattering area through a reflector (15), a convex lens II (16), a diaphragm (17), a convex lens III (18), a reflector (19), a convex lens IV (20) and a convex lens V (21), a forward signal reaches a detector (23) through an F-P scanning etalon (22), an F-P scanning etalon controller (24) controls the F-P scanning etalon (22), a driver (25) drives the F-P scanning etalon controller (24) and the F-P scanning etalon (22) simultaneously, a photon information acquisition card (26) controls the F-P scanning etalon controller (24), the F-P scanning etalon (22) and the detector (23) simultaneously, and the final signal is displayed on a computer (27).
2. The method for detecting the structure of the acoustic photonic crystal with stimulated brillouin scattering in water according to claim 1, wherein the experimental detection device using the method comprises seed injection pulses Nd: YAG laser (01), lambda/2 wave plate (02), 95% spectroscope (03), polarization spectroscope (04), lambda/4 wave plate (05), focusing system (06), sample cell (07), reflector (08), convex lens I (09), diaphragm (10), concave lens (11), F-P etalon (12), ICCD (13), computer (14), reflector (15), convex lens II (16), diaphragm (17), convex lens III (18), reflector (19), convex lens IV (20), convex lens V (21), F-P scanning etalon (22), detector (23), F-P scanning etalon controller (24), driver (25), photon information acquisition card (26) and computer (27).
3. The method for detecting the structure of the acoustic photonic crystal with stimulated brillouin scattering in water according to claim 1, wherein a seed injection pulse Nd with an output wavelength of 532 nm: the YAG laser (01) generates a stimulated Brillouin scattering acousto-optic crystal structure, and amplifies weak light beams through the signal amplification effect of the acousto-optic crystal structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112269262A (en) * | 2020-09-24 | 2021-01-26 | 南昌航空大学 | Method for verifying stimulated Brillouin scattering ultrasonic grating structure in water |
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Application publication date: 20200110 |