CN202423816U - Coherent beam combining fiber laser based on multi-linear cavity structure - Google Patents
Coherent beam combining fiber laser based on multi-linear cavity structure Download PDFInfo
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- CN202423816U CN202423816U CN2011205098050U CN201120509805U CN202423816U CN 202423816 U CN202423816 U CN 202423816U CN 2011205098050 U CN2011205098050 U CN 2011205098050U CN 201120509805 U CN201120509805 U CN 201120509805U CN 202423816 U CN202423816 U CN 202423816U
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Abstract
The utility model provides a coherent beam combining fiber laser based on a multi-linear cavity structure, relating to a laser and solving the problems of great bandwidth of output laser, less amount of light paths, low output power and complex structure in the traditional phase locking method. A first active single mode fiber to an Nth active single-mode fiber (11, 12,......, 1N), a first fiber grating to an N+1th fiber grating (21, 22, 23,......, 2N, 2(N+1)), a first coupler to an Nth coupler (31, 32,......, 3N), a first pumping source to an Nth pumping source (41, 42,......,4N), a first single mode fiber to an Nth single mode fiber (51, 52,......, 5N) as well as a first wavelength division multiplexer to an Nth wavelength division multiplexer (61, 62,......,6N) constitute the coherent beam combining fiber with N linear cavities. N is an integer from 2 to 100. The N linear cavities are connected in series so that the resonance of each linear cavity is within the same frequency band. Laser signals are derived by N single mode fibers and are coherent to obtain coherent laser with high power. The coherent beam combining fiber laser based on the multi-linear cavity structure is suitable for the fields of industrial process, national defense and the like requiring high-power lasers.
Description
Technical field
The utility model relates to a kind of fiber laser, is applicable to that industrial processes and national defence etc. need the field of superpower laser.
Background technology
Laser is compared ordinary light source as a kind of artificial light has a lot of advantages, and for example the coherence is strong, brightness is high, high directivity etc.Thereby just receive the favor of vast researcher from coming out from it, especially swift and violent in superpower laser direction progress.At present, powerful fiber laser is widely used in the industrial circles such as accurate welding and cutting, and demonstrates wide application prospect in military field.In recent years, the power output fast lifting of fiber laser, the method for multiple raising laser output power is suggested.
At first, attracted people's extensive concern with characteristics such as its good beam quality, conversion efficiency height and compact conformations based on the fiber laser of covering pumping technology.The single fiber power output of fiber laser in 2004 reaches a kilowatt magnitude, and IPG company reports in 2009 have been realized the single-mode laser output of single fiber myriawatt.But along with the increase of power, various nonlinear effects such as SBS, SRS and FWM make beam quality seriously reduce, and become the huge obstacle of further increase laser power.The proposition of big mode field area (LMA) optical fiber becomes a kind of feasible method; Keeping under the constant situation of optical power density; Increase fiber radius and can effectively increase the luminous power that optical fiber can carry, for the preparation of high power fiber laser provides necessary precondition.But because the fiber radius increasing degree is limited, excessive fiber radius makes the complicacy that the mould field becomes, beam quality can not get guaranteeing, so this method problem that can solve receives the restriction of fiber size.
Another kind method is MOPA (MOPA), and this method can effectively increase laser power, and exports being of high quality of laser, but receives the restriction of simple optical fiber luminous power bearing capacity equally.
By contrast, a kind of more efficiently method that realizes high power laser output of Shu Chengwei of closing of multi-channel optical fibre laser.Guarantee to export the beam quality of laser when increasing power output to a certain extent, relevantly close the bundle technology and become first-selection, the relevant bundle that closes is divided into initiatively phase locking and passive phase locking again.Initiatively phase locking needs comparatively complicated outside phase modulation device; And less stable; By contrast, passive phase locking does not need complicated phase modifying equipment, relies on each road laser phase of the passive adjustment of equipment of laser self fully; Reach the synchronous purpose of each road laser, efficient and stability are all higher.But with regard to the implementation method of at present existing passive phase locking, the bandwidth of output laser, light path quantity is few, and power output is low, complex structure.
The utility model content
The utility model technical problem to be solved is: the implementation method of existing passive phase locking, and the bandwidth of output laser, light path quantity is few, and power output is low, complex structure.
The technical scheme of the utility model is:
Based on the relevant bundle fiber laser that closes of polyteny cavity configuration, this laser comprise first to the N active monomode fiber, first to the N+1 fiber grating, first to the N coupler, first to the N pumping source, first to N monomode fiber and first to the N wavelength division multiplexer.
First fiber grating connects second port of first wavelength division multiplexer; First port of first wavelength division multiplexer connects first pumping source; The 3rd port of first wavelength division multiplexer connects an end of the first active monomode fiber, first port of another termination first coupler of the first active monomode fiber, and second port of first coupler connects an end of second fiber grating; The 3rd port of first coupler connects an end of first monomode fiber, and laser is from the other end output of first monomode fiber.
Second port of another termination second wavelength division multiplexer of second fiber grating; First port of second wavelength division multiplexer connects second pumping source; The 3rd port of second wavelength division multiplexer connects an end of the second active monomode fiber, first port of another termination second coupler of the second active monomode fiber, and second port of second coupler connects an end of the 3rd fiber grating; The 3rd port of second coupler connects an end of second monomode fiber, and laser is from the other end output of second monomode fiber.
……
Second port of another termination N wavelength division multiplexer of N fiber grating; First port of N wavelength division multiplexer connects the N pumping source; The 3rd port of N wavelength division multiplexer connects an end of the active monomode fiber of N, first port of another termination N coupler of the active monomode fiber of N, and second port of N coupler connects the N+1 fiber grating; The 3rd port of N coupler connects an end of N monomode fiber, and laser is from the other end output of N monomode fiber.
First other end to the N monomode fiber is positioned at same plane.
The integer of N=2～100.
The utility model is compared the beneficial effect that is had with prior art:
The utility model utilizes the linear cavity structure to realize the connection of multistage Active Optical Fiber; The fiber grating at linear cavity two ends is consistent arbitrarily; The laser signal bands of a spectrum that guarantee to produce have overlapping part, so that the unanimity of laser frequency between each linear cavity, make each linear cavity acting in conjunction and resonance in identical frequency band; The laser frequency band that produces is narrow, and the coherence is strong.Used each device price is low, and stability is strong, and the quantity through simple increase linear cavity reaches the purpose that increases light path quantity and gross output, and is simple in structure.
Description of drawings
Fig. 1 is the relevant bundle fiber laser that closes based on the polyteny cavity configuration of N linear cavity.
Fig. 2 is the relevant bundle fiber laser that closes based on the polyteny cavity configuration of two linear cavity.
Fig. 3 is the relevant bundle fiber laser that closes based on the polyteny cavity configuration of ten linear cavity.
Fig. 4 is the relevant bundle fiber laser that closes based on the polyteny cavity configuration of 100 linear cavity.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Execution mode one
The relevant bundle fiber laser that closes based on the polyteny cavity configuration; Like Fig. 1; This laser comprise first to the N active monomode fiber 11,12 ..., 1N, first to N+1 fiber grating 21,22,23 ..., 2N, 2 (N+1), first to N coupler 31,32 ..., 3N; First to N pumping source 41,42 ..., 4N, first to N monomode fiber 51,52 ..., 5N and first to N wavelength division multiplexer 61,62 ..., 6N.
Second port of another termination second wavelength division multiplexer 62 of second fiber grating 22; First port of second wavelength division multiplexer 62 connects second pumping source 42; The 3rd port of second wavelength division multiplexer 62 connects an end of the second active monomode fiber 12; First port of another termination second coupler 32 of the second active monomode fiber 12, second port of second coupler 32 connects an end of the 3rd fiber grating 23, and the 3rd port of second coupler 32 connects an end of second monomode fiber 52; Laser constitutes second linear cavity from the other end output of second monomode fiber 52.
……
Second port of another termination N wavelength division multiplexer 6N of N fiber grating 2N; First port of N wavelength division multiplexer 6N meets N pumping source 4N; The 3rd port of N wavelength division multiplexer 6N connects the end of the active monomode fiber 1N of N; First port of another termination N coupler 3N of the active monomode fiber 1N of N, second port of N coupler 3N connects N+1 fiber grating 2 (N+1), and the 3rd port of N coupler 3N connects the end of N monomode fiber 5N; Laser constitutes N linear cavity from the other end output of N monomode fiber 5N.
First to N monomode fiber 51,52 ..., 5N the other end be positioned at same plane.
The integer of N=2～100.
Described first to the N active monomode fiber 11,12 ..., 1N fibre core in equal doping with rare-earth ions, comprise erbium ion, ytterbium ion, neodymium ion, thulium ion or holmium ion.
Described first to N+1 fiber grating 21,22,23 ..., 2N, 2 (N+1) centre wavelength all identical.
First and the centre wavelength reflectivity of N+1 fiber grating 21,2 (N+1) be greater than 99%.
Second to N fiber grating 22,23 ..., 2N the centre wavelength reflectivity be 50%～90%.
Execution mode two
The relevant bundle fiber laser that closes based on the polyteny cavity configuration; Like Fig. 2; This laser comprises first, second active monomode fiber 11,12, first, second, third fiber gratings 21,22,23, first, second coupler 31,32; First, second pumping source 41,42, first, second monomode fiber 51,52 and first, second wavelength division multiplexer 61,62.
Second port of another termination second wavelength division multiplexer 62 of second fiber grating 22; First port of second wavelength division multiplexer 62 connects second pumping source 42; The 3rd port of second wavelength division multiplexer 62 connects an end of the second active monomode fiber 12; First port of another termination second coupler 32 of the second active monomode fiber 12, second port of second coupler 32 connects an end of the 3rd fiber grating 23, and the 3rd port of second coupler 32 connects an end of second monomode fiber 52; Laser constitutes second linear cavity from the other end output of second monomode fiber 52.
The other end of first, second monomode fiber 51,52 is positioned at same plane.
Equal er-doped ion in the fibre core of described first, second active monomode fiber 11,12.
The centre wavelength of described first to the 3rd fiber grating 21,22,23 is all identical.
The centre wavelength reflectivity of the first and the 3rd fiber grating 21,23 is 99.1%.
The centre wavelength reflectivity of second fiber grating 22 is 50%.
Execution mode three
Execution mode three, like Fig. 3, distinguish with execution mode two:
The quantity of linear cavity is ten.
First to the tenth monomode fiber 51,52 ..., 510 the other end is positioned at same plane.
Described first to the tenth active monomode fiber 11,12 ..., all mix thulium ion in 110 the fibre core.
Described the first to the 11 fiber grating 21,22,23 ..., 210,211 centre wavelength is all identical.
The centre wavelength reflectivity of the first and the 11 fiber grating 21,211 is 99.9%.
Second to the tenth fiber grating 22,23 ..., 210 centre wavelength reflectivity is 90%.
Execution mode four
Execution mode four, like Fig. 4, distinguish with execution mode two:
The quantity of linear cavity is 100.
The first to the 100 monomode fiber 51,52 ..., 5100 the other end is positioned at same plane.
The described the first to the 100 active monomode fiber 11,12 ..., all mix ytterbium ion in 1100 the fibre core.
Described the first to the 101 fiber grating 21,22,23 ..., 2100,2101 centre wavelength is all identical.
The centre wavelength reflectivity of the first and the 101 fiber grating 21,2101 is 99.5%.
The second to the 100 fiber grating 22,23 ..., 2100 centre wavelength reflectivity is 70%.
Claims (2)
1. based on the relevant bundle fiber laser that closes of polyteny cavity configuration; It is characterized in that: this laser comprise first to the N active monomode fiber (11,12 ..., 1N); First to the N+1 fiber grating (21,22,23 ..., 2N, 2 (N+1)); First to the N coupler (31,32 ..., 3N); First to the N pumping source (41,42 ..., 4N), first to the N monomode fiber (51,52 ..., 5N) and first to the N wavelength division multiplexer (61,62 ..., 6N);
First fiber grating (21) connects second port of first wavelength division multiplexer (61); First port of first wavelength division multiplexer (61) connects first pumping source (41); The 3rd port of first wavelength division multiplexer (61) connects an end of the first active monomode fiber (11); First port of another termination first coupler (31) of the first active monomode fiber (11); Second port of first coupler (31) connects an end of second fiber grating (22), and the 3rd port of first coupler (31) connects an end of first monomode fiber (51), and laser is from the other end output of first monomode fiber (51);
Second port of another termination second wavelength division multiplexer (62) of second fiber grating (22); First port of second wavelength division multiplexer (62) connects second pumping source (42); The 3rd port of second wavelength division multiplexer (62) connects an end of the second active monomode fiber (12); First port of another termination second coupler (32) of the second active monomode fiber (12); Second port of second coupler (32) connects an end of the 3rd fiber grating (23), and the 3rd port of second coupler (32) connects an end of second monomode fiber (52), and laser is from the other end output of second monomode fiber (52);
……
Second port of another termination N wavelength division multiplexer (6N) of N fiber grating (2N); First port of N wavelength division multiplexer (6N) connects N pumping source (4N); The 3rd port of N wavelength division multiplexer (6N) connects an end of the active monomode fiber of N (1N); First port of another termination N coupler (3N) of the active monomode fiber of N (1N); Second port of N coupler (3N) connects N+1 fiber grating (2 (N+1)), and the 3rd port of N coupler (3N) connects an end of N monomode fiber (5N), and laser is from the other end output of N monomode fiber (5N);
First to the N monomode fiber (51,52 ..., 5N) the other end be positioned at same plane;
The integer of N=2～100.
2. the relevant bundle fiber laser that closes based on the polyteny cavity configuration according to claim 1 is characterized in that:
Described first to the N+1 fiber grating (21,22,23 ..., 2N, 2 (N+1)) centre wavelength all identical;
Described first and the centre wavelength reflectivity of N+1 fiber grating (21,2 (N+1)) be greater than 99%;
Described second to the N fiber grating (22,23 ..., 2N) the centre wavelength reflectivity be 50%～90%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205098050U CN202423816U (en) | 2011-12-08 | 2011-12-08 | Coherent beam combining fiber laser based on multi-linear cavity structure |
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| CN2011205098050U CN202423816U (en) | 2011-12-08 | 2011-12-08 | Coherent beam combining fiber laser based on multi-linear cavity structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344184A (en) * | 2013-06-09 | 2013-10-09 | 安徽大学 | Self-mixing wavelength division multiplexing multichannel displacement sensing system based on linear cavity multi-wavelength fiber laser |
| CN106785840A (en) * | 2016-12-21 | 2017-05-31 | 东北林业大学 | High efficiency optical fiber laser |
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2011
- 2011-12-08 CN CN2011205098050U patent/CN202423816U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344184A (en) * | 2013-06-09 | 2013-10-09 | 安徽大学 | Self-mixing wavelength division multiplexing multichannel displacement sensing system based on linear cavity multi-wavelength fiber laser |
| CN103344184B (en) * | 2013-06-09 | 2015-11-25 | 安徽大学 | Based on the wavelength-division of the mixing certainly multiplexed multi-channel displacement sensing system of linear cavity multi-wavelength optical fiber laser |
| CN106785840A (en) * | 2016-12-21 | 2017-05-31 | 东北林业大学 | High efficiency optical fiber laser |
| CN106785840B (en) * | 2016-12-21 | 2019-07-05 | 东北林业大学 | High efficiency optical fiber laser |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20121208 |