CN102253564B - Device and method for stimulated Brillouin scattering by optical fibre transmission through continuous pumping - Google Patents
Device and method for stimulated Brillouin scattering by optical fibre transmission through continuous pumping Download PDFInfo
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- CN102253564B CN102253564B CN 201110154378 CN201110154378A CN102253564B CN 102253564 B CN102253564 B CN 102253564B CN 201110154378 CN201110154378 CN 201110154378 CN 201110154378 A CN201110154378 A CN 201110154378A CN 102253564 B CN102253564 B CN 102253564B
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Abstract
The invention discloses a system and method for stimulated Brillouin scattering. A pulse seed laser (1) emits a pulse seed laser beam; the pulse seed laser beam is transmitted to an optical fibre beam splitter (2) through polarization holding optical fibres and then split into two beams; an optical fibre bundler (3) is connected with tail ends of the first polarization holding optical fibre (7) and the second polarization holding optical fibre (8); an optical fibre time difference regulating device (5) is arranged in the first polarization holding optical fibre (7), the device (5) is used for regulating the time difference between the laser beams in the first polarization holding optical fibre (7) and the second polarization holding optical fibre (8) reaching to the optical fibre bundler (3), wherein a controller (9) controls a pumping system (6) to start working before the pulse seed laser emits the pulse laser beam and to continuously pump laser amplification medium (4) in the entire working period.
Description
Technical field
The present invention relates to a kind of Brillouin scattering laser aid, belong to the photoelectron technical field of detection.
Background technology
The technology of utilizing Brillouin scattering to carry out Underwater Target Detection has at present obtained actual application, and a problem that ultimate challenge is exactly a detection range in this technical development is well-known; The visible light window of fresh water or seawater is near 532nm, even still use the optical maser wavelength of the laser of this wavelength as the Brillouin scattering undersea detection, because marine site of being surveyed in the reality or lake water quality are different; The aggravation of particularly polluting along with environment in recent years, it is poor that present ubiquity various water area water-qualities, and the direct influence that water quality inferiority is brought for the laser undersea detection is exactly the transmission range that has had a strong impact on laser; Even in the middle of the unpolluted water territory; Because WATER AS FLOW MEDIUM still is a bigger numerical value for the laser attenuation coefficient of 532nm comparatively speaking, the device that particularly carries out various detections for the scattered light that utilizes stimulated Brillouin scattering is in order to reach long detection range; Just need powerful laser instrument; But powerful laser not only needs high cost, and its maintenance uses needed in every respect expense all very high; Bigger general each the big volume that all can have of the output power that a more disadvantageous aspect is exactly a laser instrument; And the laser instrument of big volume is worthless for the application in some fields, because in some applications, not have the laser instrument of the ccontaining big volume in so big space; And for some devices of on moving target, surveying, big volume is obviously worthless especially.For not increasing volume or increasing on the basis of small size very or longer excited Brillouin detection range, various solutions have been proposed respectively in the prior art.Wherein a kind of technical scheme is exactly to utilize a branch of in addition laser with same frequency and identical polarization state that the passback stimulated Brillouin scattering light that produces is amplified; Also promptly the stimulated Brillouin scattering light that produces being carried out secondary is excited to amplify; To improve the light intensity of the stimulated Brillouin scattering light that returns; Thereby the sensor that guarantees receiving end can receive enough stimulated Brillouin scattering light signals to analyze the required probing medium information that obtains on this basis; At present in the configuration of laser that is used to amplify and stimulated Brillouin scattering light light path, there is dual mode; A kind of mode is that the two-way light beam is intersected, and a kind of in addition mode then is the two-way beam path to be overlapped be provided with.Accompanying drawing 1 and accompanying drawing 2 are shown all belongs to situation arranged in a crossed manner, wherein utilize two catoptrons 102 and 103 that beam of laser 101 is divided into two bundles in the accompanying drawing 1, and then the two bundle laser that will separate is crossing in stimulated Brillouin scattering medium 104; So that the stimulated Brillouin scattering light that produces is amplified, in the middle of this device, owing to be that the beam of laser bundle has been divided into two bundles; So this two bundles laser is duplicate on frequency and polarization state; This device construction is simple, but has two problems, and a problem is owing to be for two bundles with beam of laser bundle branch; So it is not very high must causing the energy of two bundle laser beam; Second problem is owing to be to use crossing mode, so just cause the The interaction distance of two-beam very short, causes utilizing of laser beam insufficient.Accompanying drawing 2 shows the other a kind of mode that is provided with that intersects; In order to improve the beam of laser bundle is divided into two bundles and the problem that causes each energy all to diminish; The light beam that has proposed to use two laser instruments 201 to send intersects by catoptron 202 and incides stimulated Brillouin scattering medium 203; Wherein each all is an independently laser instrument, thus energy just can not diminish yet, in order to guarantee that laser that two laser instruments send is in identical generation to guarantee to be excited to amplify in nature; Need to use same seed laser to be injected into respectively in two laser instruments; Like this, though this system has solved the problem that laser beam energy diminishes, this device still can not solve the short problem of The interaction distance.In order to solve the short problem of The interaction distance; The best way is that the light path of two bundle laser beam is carried out overlapping setting; Existing light path is overlapping be provided with in as disclosed one Chinese patent application CN101266342A had disclosed, in order to realize that with two pulse laser beams with on coincidence to a light path that the time difference (this is to produce the secondary excited Brillouin to amplify needed) arranged, this device utilizes photoelectric crystal with two bundle polarization state different laser Shu Jinhang controls; Thereby guarantee and can two bundle of pulsed laser be coupled on the light path with the mode that the time difference is arranged; And have identical polarization state in the time of can also guaranteeing to reach the stimulated Brillouin scattering medium, need use polarization coupled mirror and electro-optic crystal to realize the polarization state control of front and back two bundle laser, not only complex structure in this device simultaneously; Simultaneously very high for the requirement of electro-optic crystal; But also being accompanied by following problem, employed two bundle laser beam or be that beam of laser is divided into two bundles will cause diminishing of two bundle laser energies like this in this device; If the two-way laser beam of using two laser instruments to produce; Though kept energy intensity not diminish, owing to use two laser instruments then can take more space accordingly, because two laser instruments obviously need occupy many one times space; And space problem is indeterminable under many circumstances or solve very difficulty, or will cause increasing sharply of cost.
Summary of the invention
The present invention puts forward in order to solve above-mentioned technical matters; Can realize that not only the identical laser beam of two-way character has the light path of the time difference and overlaps; But also that volume that can implement device does not significantly become is big; The time difference wherein can be regulated, and the adjusting of its time difference can be provided with according to the optimization that stimulated Brillouin scattering is amplified, certainly; If with said apparatus be used for other need character is identical the two-way laser beam have the light path of the time difference and overlap; The time difference is so wherein just regulated according to the needs of reality, and also promptly this device not only can be used for the application that excited Brillouin amplifies, and can also be applied in the system of similar this type of device of needs equally.
In order to solve above-mentioned technical matters, the identical laser optical path coincidence arrangement of two-way character with time difference of the present invention comprises: pulse seed laser instrument (1), fiber optic splitter (2); Optical-fiber bundling device (3), laser amplification medium (4), optical fiber time difference regulating device (5); Laser amplification medium pumping system (6); First polarization-maintaining fiber (7), second polarization-maintaining fiber (8), controller 9.
Pulse seed laser instrument (1) sends pulse seed laser; This pulse seed laser is transferred to fiber optic splitter 2 through polarization-maintaining fiber; Be divided into two bundles then; This two bundles laser enters into first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8 that is connected with fiber optic splitter 2 respectively; These two polarization-maintaining fibers are used for the pulse laser beam that imports into separately is transferred to optical-fiber bundling device 3 with the mode that polarization keeps, and optical-fiber bundling device 3 all is connected with the tail end of first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8, also is their an other end; And in first polarization-maintaining fiber 7, be provided with optical fiber time difference regulating device 5; This device 5 is used to regulate the mistiming of the laser beam arrival optical-fiber bundling device 3 in first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8, and above-mentioned two-way laser beam is injected into after output fiber bundling device 3 in the laser amplification medium 4, then incides the stimulated Brillouin scattering that the stimulated Brillouin scattering medium is used to produce amplification through the laser beam after amplifying.Wherein laser amplification medium 4 has the pumping system 6 that is symmetrically distributed about amplification medium; Controller 9 is wherein being controlled pumping system 6 and before the pulse seed laser instrument sends pulse laser, is promptly being started working; And in the whole duration of work laser amplification medium 4 is carried out continual pumping; Pumping system (6) just stops a period of time after two bundle seed lasers with time difference are amplified, up to carrying out the circulation that next round is amplified.
Description of drawings
Accompanying drawing 1 is in the prior art beam of laser bundle to be divided into the back system arranged in a crossed manner in the stimulated Brillouin scattering medium of two bundles;
Accompanying drawing 2 is in the prior art that two bundle natures are the identical laser beam of being sent by two laser instruments systems arranged in a crossed manner in the stimulated Brillouin scattering medium;
Accompanying drawing 3 is first embodiment of continuous pumping stimulated Brillouin scattering device among the present invention;
Accompanying drawing 4 is second embodiment of the stimulated Brillouin scattering device of continuous pumping among the present invention.
In accompanying drawing 3,1 expression seed laser, 2 expression fiber optic splitters, 3 expression optical-fiber bundling devices; 4 expression laser amplification mediums, 5 expression optical fiber time difference regulating devices, the 6th, laser amplification medium pumping system; 7 is first polarization-maintaining fibers, and 8 is second polarization-maintaining fibers, the 9th, and controller.
Embodiment
According to accompanying drawing 3 first embodiment of the present invention is described below.Pulse seed laser instrument 1 sends pulse seed laser; Pulse seed laser is through entering into fiber optic splitter 2 after the polarization-maintaining fiber transmission; Be divided into two bundles then; Enter into first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8 that are connected with fiber optic splitter respectively, the tail end that keeps being provided with optical fiber time difference regulating device 5, the first polarization-maintaining fibers 7 and second polarization-maintaining fiber 8 in the optical fiber 7 in first polarization all is connected to optical-fiber bundling device 3; It also is the other end that optical-fiber bundling device 3 has been connected to first polarization-maintaining fiber and second polarization fiber; Laser beam incides laser amplification medium 4 after through polarization-maintaining fiber and optical-fiber bundling device 3, laser amplification medium 4 wherein has the pumping system 6 that is symmetrically distributed about amplification medium, and controller 9 is connecting pumping system 6 and pulse seed laser instrument 1.Optical fiber time difference regulating device wherein can adopt adjustable optical fiber delay device etc.
Seed laser 1 sends seed laser; This seed laser is transferred to fiber optic splitter 2 through polarization-maintaining fiber; Be divided into two bundles then; Enter into first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8 that are connected with fiber optic splitter respectively; The tail end that keeps being provided with optical fiber time difference regulating device 5, the first polarization-maintaining fibers 7 and second polarization-maintaining fiber 8 in the optical fiber 7 in first polarization all is connected to optical-fiber bundling device 3, and in first polarization-maintaining fiber 7, is provided with optical fiber time difference regulating device; This optical fiber time difference regulating device is used to regulate the mistiming of the laser beam arrival optical-fiber bundling device 3 in first polarization-maintaining fiber 7 and second polarization-maintaining fiber 8; Above-mentioned two-way laser beam is injected into after output fiber bundling device 3 in the laser amplification medium 4, to be amplified by laser amplification medium, then incides stimulated Brillouin scattering medium (not shown) through the laser beam after amplifying and is used to produce the stimulated Brillouin scattering of amplification.Wherein laser amplification medium 4 has the pumping system 6 that is symmetrically distributed about laser amplification medium, and controller 9 is being controlled pumping system 6 and pulse seed laser instrument 1 simultaneously.Seed laser adopts pulsed laser not only can make two bundle laser that the priority of differentiation can be arranged in time here; The double optimization of realizing stimulated Brillouin scattering amplifies; Can also guarantee simultaneously that the back also can effectively be amplified through the laser beam of laser amplification medium in time; And in order to realize 2 above-mentioned points; Just need guarantee that pumping system arrives excited state with the laser amplification medium pumping when laser beam is passed through laser amplification medium; This point realizes through controller 9; Controller 9 can guarantee that pumping system 6 is just in running order before the pulse seed Laser emission goes out pulse seed laser, and pumping system keeps continual work in whole process, could guarantee like this after the first bundle laser is through laser amplification medium, can also realize the amplification to the second bundle laser; Carry out just can be implemented in after such being provided with the identical two bundle laser of front and back character of realizing having the mistiming in the laser instrument, thereby can realize the stimulated Brillouin scattering of amplifying.If laser amplification medium is in by pump state for a long time; So just maybe be owing to dispelling the heat untimely or the too much damage that causes laser amplification medium of thermal accumlation; In order to prevent the damage of laser amplification medium; In this device busy process, amplify two bundle seed laser bundles at every turn and afterwards just stop the regular hour, to realize the needs of heat radiation.
In this system; Before and after the light path of two bundle laser overlap fully, so guarantee to have had maximum excited Brillouin phase mutual edge distance, only need just can realize by a laser instrument simultaneously; Not only do not reduce the energy of each Shu Jiguang, also reached the purpose that does not increase volume.Simultaneously owing to be provided with optical fiber time difference regulating device 5, the time difference before and after can regulating arbitrarily between the two bundle laser beam, so just can this system applies in various environment.
Optical fiber time difference regulating device 5 wherein is used to regulate the time difference between the two bundle laser; Can be provided with according to the optimization of stimulated Brillouin scattering as for being provided with of the time difference; If said apparatus is used for other application; Can also regulate according to the situation of reality, also be that above-mentioned device is not limited to stimulated Brillouin scattering.
Below in conjunction with the accompanying drawing 4 explanation second embodiment of the present invention; In a second embodiment, comprise two laser amplification mediums 4 and 4 ', wherein laser amplification medium 4 has pumping system 6; Laser amplification medium 4 ' has pumping system 6 '; These two pumping systems all are controlled the control of device 9, in use, and two pumping system alternations; Explain the front; Because the laser amplification medium among first embodiment be because the needs of heat radiation can not always be in pump state, thus just need to interrupt a period of time after amplifying two bundle seed lasers each, because the appearance of this break period has just caused this device to use the upward reduction of occurrence frequency; But the device for second embodiment then can significantly improve the frequency that stimulated Brillouin scattering takes place; In two laser amplification mediums among this embodiment each and with its corresponding pumping system all with first embodiment in the same, this two laser amplification medium one after the others work, such as; Amplify first with laser amplification medium 4 and the pumping system 6 corresponding earlier the needed front and back two bundle seed lasers with time difference of stimulated Brillouin scattering take place with it; Carrying out next time just using laser amplification medium 4 ' and pumping system 6 ' to amplify this time needed front and back two bundle seed lasers when stimulated Brillouin scattering takes place, re-using laser amplification medium 4 and the pumping system 6 corresponding more next time the time with it with time difference; The use that replaces like this can also can not reduce the occurrence frequency of stimulated Brillouin scattering simultaneously so that each amplification medium can obtain the sufficient heat radiation time.
Claims (3)
1. a stimulated Brillouin scattering generating means comprises: pulse seed laser instrument (1), fiber optic splitter (2); Optical-fiber bundling device (3), laser amplification medium (4), optical fiber time difference regulating device (5); Laser amplification medium pumping system (6), first polarization-maintaining fiber (7), second polarization-maintaining fiber (8); The 3rd polarization-maintaining fiber, controller (9);
Pulse seed laser instrument (1) sends pulse seed laser; This pulse seed laser is transferred to fiber optic splitter (2) through the 3rd polarization-maintaining fiber; Be divided into two bundles then; This two bundles laser enters into first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8) that is connected with fiber optic splitter (2) respectively; An other end of first polarization-maintaining fiber (7) all is connected with optical-fiber bundling device (3) with an other end of second polarization-maintaining fiber (8); And in first polarization-maintaining fiber (7), be provided with optical fiber time difference regulating device (5); This optical fiber time difference regulating device (5) is used to regulate the mistiming of the laser beam arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8), and two above-mentioned bundle seed laser bundles are in output fiber bundling device (3) is injected into laser amplification medium (4) afterwards, and wherein laser amplification medium (4) has the pumping system (6) that is symmetrically distributed about amplification medium; Controller wherein (9) is being controlled pumping system (6) and before the pulse seed laser instrument sends pulse laser, is promptly being started working; And in during two bundle seed lasers with time difference are amplified laser amplification medium (4) is carried out continual pumping, pumping system (6) just stops a period of time after two bundle seed lasers with time difference are amplified, up to carrying out the next round circulation.
2. a stimulated Brillouin scattering generating means comprises: pulse seed laser instrument (1), fiber optic splitter (2); Optical-fiber bundling device (3), first laser amplification medium (4) and second laser amplification medium (4 '), optical fiber time difference regulating device (5); The first laser amplification medium pumping system (6) and the second laser amplification medium pumping system (6 '), first polarization-maintaining fiber (7), second polarization-maintaining fiber (8); The 3rd polarization-maintaining fiber, controller (9);
Pulse seed laser instrument (1) sends pulse seed laser; This pulse seed laser is transferred to fiber optic splitter (2) through the 3rd polarization-maintaining fiber; Be divided into two bundles then; This two bundles laser enters into first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8) that is connected with fiber optic splitter (2) respectively; An other end of first polarization-maintaining fiber (7) all is connected with optical-fiber bundling device (3) with an other end of second polarization-maintaining fiber (8); And in first polarization-maintaining fiber (7), be provided with optical fiber time difference regulating device (5); This optical fiber time difference regulating device (5) is used to regulate the mistiming of the laser beam arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8); Two above-mentioned bundle seed laser bundles are in output fiber bundling device (3) is injected into first laser amplification medium (4) and second laser amplification medium (4 ') afterwards; First laser amplification medium (4) and second laser amplification medium order on light path is provided with; Wherein first laser amplification medium (4) has the first laser amplification medium pumping system (6); Second laser amplification medium (4 ') has the second laser amplification medium pumping system (6 '), the first laser amplification medium pumping system (6) and all controlled device of the second laser amplification medium pumping system (6 ') (9) control, and controller wherein (9) is being controlled said two pumping systems and before the pulse seed laser instrument sends pulse laser, is promptly being started working; Said two pumping system alternations; Also be to amplify with first laser amplification medium (4) and the first laser amplification medium pumping system (6) corresponding earlier the needed front and back two bundle seed lasers with time difference of stimulated Brillouin scattering take place for the first time, when carrying out stimulated Brillouin scattering generation next time, use second laser amplification medium (4 ') and the second laser amplification medium pumping system (6 ') to amplify this time needed front and back two bundle seed lasers with time difference with it; Re-use first laser amplification medium (4) and the first laser amplification medium pumping system (6) corresponding next time the time again, be used alternatingly like this with it.
3. stimulated Brillouin scattering method for generation; Pulse seed laser instrument (1) sends pulse seed laser; This pulse seed laser is transferred to fiber optic splitter (2) through polarization-maintaining fiber; Be divided into two bundles then; This two bundles seed laser enters into first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8) that is connected with fiber optic splitter (2) respectively; These two polarization-maintaining fibers are used for the pulse laser beam that imports into separately is transferred to optical-fiber bundling device (3) with the mode that polarization keeps; Optical-fiber bundling device (3) all is connected with an other end of first polarization-maintaining fiber (7) and an other end of second polarization-maintaining fiber (8); And in first polarization-maintaining fiber (7), be provided with optical fiber time difference regulating device (5), this optical fiber time difference regulating device (5) is used to regulate the mistiming of the seed laser bundle arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (7) and second polarization-maintaining fiber (8), and above-mentioned two-way seed laser bundle is in output fiber bundling device (3) is injected into laser amplification medium (4) afterwards; Laser beam through after amplifying then incides the stimulated Brillouin scattering that the stimulated Brillouin scattering medium is used to produce amplification; Wherein laser amplification medium (4) has the pumping system (6) that is symmetrically distributed about amplification medium, and controller wherein (9) is being controlled pumping system (6) and before the pulse seed laser instrument sends pulse laser, promptly started working, and in during two bundle seed lasers with time difference are amplified laser amplification medium (4) is carried out continual pumping; Pumping system (6) just stops a period of time after two bundle seed lasers with time difference are amplified, up to carrying out the next round circulation.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266342B (en) * | 2007-08-08 | 2010-12-29 | 北京师范大学 | Polarization state for controlling two bundle of pulsed laser by out-cavity electro-optical polarization controller |
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| US6891660B2 (en) * | 2003-01-15 | 2005-05-10 | The Boeing Company | Stimulated brillouin scattering optical amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266342B (en) * | 2007-08-08 | 2010-12-29 | 北京师范大学 | Polarization state for controlling two bundle of pulsed laser by out-cavity electro-optical polarization controller |
Non-Patent Citations (2)
| Title |
|---|
| 丁迎春等.相遇时间对布里渊放大的影响.《光学学报》.2002,第22卷(第7期),第784-788页. |
| 相遇时间对布里渊放大的影响;丁迎春等;《光学学报》;20020731;第22卷(第7期);第784-788页 * |
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Effective date of registration: 20170815 Address after: 523003, A, building 4, Chi Chi Valley, 1 Nanshan Road, Songshan hi tech Industrial Development Zone, Dongguan, Guangdong Patentee after: Dimension (Dongguan) Photoelectric Technology Co., Ltd. Address before: 330063 Nanchang, Jiangxi province and South Road, No. 696 Patentee before: Nanchang Univ. of Aviation |
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