CN102299476B - Time difference pumping stimulated Brillouin scattering device for optical fiber transmission seed laser and method - Google Patents
Time difference pumping stimulated Brillouin scattering device for optical fiber transmission seed laser and method Download PDFInfo
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Abstract
The invention relates to a system for generating stimulated Brillouin scattering and a method. A seed laser (1) gives out seed laser, the seed laser is transmitted to an optical fiber beam splitter 2 through a polarization maintaining optical fiber and is then divided into two beams, the two beams of laser respectively enter a first polarization maintaining optical fiber 10 and a second polarization maintaining optical fiber 11 which are connected with the optical fiber beam splitter 2, the two polarization maintaining optical fibers are used for transmitting the respective laser beams into an optical fiber beam combiner 3 in a polarization maintaining mode, and an optical fiber time difference regulating device 5 is used for regulating the laser beams in the first polarization maintaining optical fiber 10 and the second polarization maintaining optical fiber 11 to reach the time difference of the optical fiber beam combiner 3, wherein the pumping time difference of two light pumping systems of laser amplification media is equal to the time difference for the laser beams of the first polarization maintaining optical fiber 10 and the second polarization maintaining optical fiber 11 to reach the optical fiber beam combiner 3.
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; 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 power output that a more disadvantageous aspect is exactly a laser; And the laser of big volume is worthless for the application in some fields, because in some applications, not have the laser 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 transducer that guarantees receiving terminal 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 speculums 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 beams; 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 lasers 201 to send intersects by speculum 202 and incides stimulated Brillouin scattering medium 203; Wherein each all is an independently laser, thus energy just can not diminish yet, in order to guarantee that laser that two lasers 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 lasers; 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 beams 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 electrooptic 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 electrooptic crystal; But also being accompanied by following problem, employed two bundle laser beams 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 that uses two lasers to produce; Though kept energy intensity not diminish, owing to use two lasers then can take more space accordingly, because two lasers 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 problem; 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 problem, stimulated Brillouin scattering device of the present invention comprises: seed laser (1), fiber optic splitter (2), optical-fiber bundling device (3); Laser amplification medium (4), optical fiber time difference adjusting device (5), the first laser amplification medium pumping system (7), the second laser amplification medium pumping system (8); Controller (9), first polarization-maintaining fiber (11), second polarization-maintaining fiber (12); Control line (12,13,14).
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; This two bundles laser enters into first polarization-maintaining fiber 10 and second polarization-maintaining fiber 11 that is connected with fiber optic splitter 2 respectively; These two polarization-maintaining fibers are used for the 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 the tail end of first polarization-maintaining fiber 10 and second polarization-maintaining fiber 11; Also be that optical-fiber bundling device 3 all is connected with an other end of first polarization-maintaining fiber and second polarization-maintaining fiber, and be provided with optical fiber time difference adjusting device 5 that this device 5 is used to regulate the time difference of the laser beam arrival optical-fiber bundling device 3 in first polarization-maintaining fiber 10 and second polarization-maintaining fiber 11 in the centre of second polarization-maintaining fiber 11; 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 independently first pumping system 7 and second pumping system 8; Use controller 9 to control to control the pumping time of two pumping systems for these two optical pumping systems, wherein the pumping time difference of two optical pumping systems equals the time difference of the laser beam arrival optical-fiber bundling device 3 in first polarization-maintaining fiber 10 and second polarization-maintaining fiber 11.
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 that is sent by two lasers systems arranged in a crossed manner in the stimulated Brillouin scattering medium;
Accompanying drawing 3 is first embodiment of stimulated Brillouin scattering device among the present invention.
Accompanying drawing 4 is second embodiment of stimulated Brillouin scattering device 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 adjusting devices; 7 and 8 is two independently laser amplification medium pumping systems, the 9th, and controller, 10 and 11 is polarization-maintaining fibers; 12,13 and 14 is the control lines that are connected controller and pumping system and time difference adjusting device.
Embodiment
According to accompanying drawing 3 first embodiment of the present invention is described below.Seed laser 1 sends seed laser; Seed laser is through entering into fiber optic splitter 2 after the polarization-maintaining fiber transmission; Be divided into two bundles then; Enter into the polarization-maintaining fiber 10 and 11 that is connected with fiber optic splitter respectively, keep the centre of optical fiber 11 to be provided with optical fiber time difference adjusting device 5 in polarization, polarization-maintaining fiber 10 and 11 tail end all are connected to optical-fiber bundling device 3; Laser beam incides laser amplification medium 4 after through polarization-maintaining fiber and optical-fiber bundling device 3; Laser amplification medium 4 wherein has two independently optical pumping systems 7 and 8, uses control line to be connected between controller 9 and the optical fiber time difference adjusting device 5, and controller 9 independently uses control line to be connected respectively with two between the optical pumping system 7 and 8.Optical fiber time difference adjusting 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; This two bundles laser enters into the polarization-maintaining fiber 10 and 11 that is connected with fiber optic splitter 2 respectively; These two polarization-maintaining fibers are used for the 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 and polarization-maintaining fiber 10 all are connected with 11 tail end, and are provided with optical fiber time difference adjusting device in the centre of polarization-maintaining fiber 11; This device is used to regulate the time difference of the laser beams arrival optical-fiber bundling device 3 in polarization-maintaining fiber 10 and the polarization-maintaining fiber 11; 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 in the accompanying drawing) through the laser beam after amplifying and is used to produce the stimulated Brillouin scattering of amplification.Wherein laser amplification medium 4 has two independently optical pumping systems 7 and 8; Use controller 9 to control to control the pumping time of two pumping systems for these two optical pumping systems; Controller 9 is being controlled optical fiber time difference adjusting device simultaneously; Be used to regulate the time difference of the laser beams arrival optical-fiber bundling device 3 in polarization-maintaining fiber 10 and the polarization-maintaining fiber 11, wherein the pumping time difference of two optical pumping systems equals the time difference of the laser beams arrival optical-fiber bundling device 3 in polarization-maintaining fiber 10 and the polarization-maintaining fiber 11.
In use; At first the pump light that sent by first pumping system of the first seed laser bundle through laser amplification medium carries out pumping and amplifies; Laser beam after obtaining amplifying; The generation that this laser beam incident is used to produce stimulated Brillouin scattering in the stimulated Brillouin scattering medium; Because the pumping time difference of controller first pumping system and second pumping system is set to equal the time difference of the first seed laser bundle and second seed laser bundle arrival optical-fiber bundling device; So restraint the seed laser bundle the time through laser amplification medium through second of optical fiber time difference adjusting device; The pump light pumping that this second bundle seed laser bundle will be sent by second pumping system and being exaggerated, the laser beam incident after this amplification amplifies with the excited Brillouin flashlight that laser was produced after first bundle is amplified to the stimulated Brillouin scattering medium.
Carry out just can be implemented in the identical two bundle laser of front and back character of realizing having the time difference in the laser after such being provided with; Thereby can realize the stimulated Brillouin scattering of amplifying, in this system, the light path of front and back two bundle laser overlaps fully; So just guarantee to have had maximum excited Brillouin phase mutual edge distance; Only need a laser just can realize simultaneously, not only do not reduce the energy of each Shu Jiguang, also reached the purpose that does not increase volume.
For a kind of certain applications; Such as stimulated Brillouin scattering; Controller 9 can not need be controlled optical fiber time difference adjusting device 5; Can adopt in advance the time difference of time difference adjusting device 5 is set, only need then to use 9 pairs two of controllers independently pumping system control, this moment only need two pumping time difference between the pumping system be set to equal polarization-maintaining fiber 10 and get final product with the time difference that laser beams in the polarization-maintaining fiber 11 arrive optical-fiber bundling device 3.
Second embodiment of books invention is described below in conjunction with accompanying drawing 4; In this embodiment; Laser amplification medium includes two laser amplification mediums 4 and 4 ', and wherein each amplification medium has a pumping system; Each pumping system also all is by 9 controls of controller, and wherein two pumping systems equal the time difference that two bundle seed lasers arrive optical-fiber bundling devices 3 for the pumping time difference of each self-corresponding laser amplification medium.
For first embodiment and second embodiment; Laser amplification medium all can be provided with multistage; So that the more laser output of macro-energy to be provided; Wherein in the embodiment shown in the accompanying drawing 3, if comprise the laser amplification medium 4 of a plurality of series connection, then each laser amplification medium all has and laser amplification medium 4 identical construction; Be that each amplification medium all has by two of controller control pumping systems independently, wherein the pumping time difference of two pumping systems equals the time difference that the first seed laser bundle and the second seed laser bundle arrive optical-fiber bundling device 3.
For second embodiment shown in the accompanying drawing 4; Also can comprise multistage laser amplification medium; First laser amplification medium 4 and second laser amplification medium 4 ' combined think a total pump arrangement; Total pump arrangement that then can comprise a plurality of series connection among this embodiment; Wherein each total pump arrangement all has identical construction, also is to equal pumping time difference of two pumping systems in each total pump arrangement the time difference that the first seed laser bundle and the second seed laser bundle arrive optical-fiber bundling device 3.
Claims (10)
1. a stimulated Brillouin scattering generating means comprises: seed laser (1), fiber optic splitter (2), optical-fiber bundling device (3); Laser amplification medium (4), optical fiber time difference adjusting device (5), the first laser amplification medium pumping system (7), the second laser amplification medium pumping system (8); Controller (9), first polarization-maintaining fiber (10), second polarization-maintaining fiber (11); Control line (12,13,14);
Seed laser (1) sends seed laser; This seed laser is transferred to fiber optic splitter (2) through the 3rd polarization-maintaining fiber; Be divided into two bundles then; This two bundles seed laser enters into first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11) that is connected with fiber optic splitter (2) respectively; Said first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11) are used for the seed laser bundle that imports into separately is transferred to optical-fiber bundling device (3) with the mode that polarization keeps; An other end of the tail end of first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11) all is connected with optical-fiber bundling device (3); And be provided with optical fiber time difference adjusting device (5) in the centre of second polarization-maintaining fiber (11); This optical fiber time difference adjusting device (5) is used to regulate the time difference of the seed laser bundle arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11); 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 two self-contained pump pumping systems---first pumping system (7) and second pumping system (8), and use controller (9) that these two pumping systems are controlled to control the pumping time difference of two pumping systems, the pumping time difference of wherein said two pumping systems equals the time difference of the seed laser bundle arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11).
2. stimulated Brillouin scattering generating means according to claim 1; Its middle controller (9) is also being controlled optical fiber time difference adjusting device (5), to regulate the time difference of the laser beam arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11).
3. stimulated Brillouin scattering generating means according to claim 1 and 2, laser amplification medium wherein comprise two, and first pumping system and second pumping are respectively applied for one of them laser amplification medium of pumping.
4. stimulated Brillouin scattering generating means according to claim 1 and 2, laser amplification medium wherein comprises the plural serial stage structure.
5. excited Brillouin generating means according to claim 1 and 2 is wherein regulated according to the maximization of stimulated Brillouin scattering light the time of delay of optical fiber time difference adjusting device.
6. one kind produces the stimulated Brillouin scattering method for generation; Seed laser (1) sends seed laser; This 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 (10) and second polarization-maintaining fiber (11) that is connected with fiber optic splitter (2) respectively; Said first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11) are used for the seed laser bundle that imports into separately is transferred to optical-fiber bundling device (3) with the mode that polarization keeps; Utilize optical fiber time difference adjusting device (5) to regulate the time difference of the laser beam arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11); 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 two independently pumping systems---first pumping system (7) and second pumping system (8), and use controller (9) that said two pumping systems are controlled to control the pumping time difference of two pumping systems, the pumping time difference of wherein said two pumping systems equals the time difference of the seed laser bundle arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11).
7. stimulated Brillouin scattering method for generation as claimed in claim 6; Its middle controller (9) is also being controlled optical fiber time difference adjusting device (5), to regulate the time difference of the seed laser bundle arrival optical-fiber bundling device (3) in first polarization-maintaining fiber (10) and second polarization-maintaining fiber (11).
8. according to claim 6 or 7 described stimulated Brillouin scattering method for generation, laser amplification medium wherein comprises two, and first pumping system and second pumping are respectively applied for one of them laser amplification medium of pumping.
9. according to claim 6 or 7 described stimulated Brillouin scattering method for generation, laser amplification medium wherein comprises the plural serial stage structure.
10. according to claim 6 or 7 described stimulated Brillouin scattering method for generation, wherein regulate according to the maximization of stimulated Brillouin scattering light the time of delay of optical path delayed adjusting device.
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| CN201110193095XA CN102299476B (en) | 2011-07-12 | 2011-07-12 | Time difference pumping stimulated Brillouin scattering device for optical fiber transmission seed laser and method |
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| CN102299476B true CN102299476B (en) | 2012-11-07 |
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