CN100345055C - Raster reflector - Google Patents
Raster reflector Download PDFInfo
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- CN100345055C CN100345055C CNB2005100596792A CN200510059679A CN100345055C CN 100345055 C CN100345055 C CN 100345055C CN B2005100596792 A CNB2005100596792 A CN B2005100596792A CN 200510059679 A CN200510059679 A CN 200510059679A CN 100345055 C CN100345055 C CN 100345055C
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Abstract
The present invention relates to a grating reflector which is composed of double-cladding optical fiber and a first grating arranged in the double-cladding optical fiber, wherein the reflectivity of the first grating to pumping light is larger than 70%, the first grating is used for reflecting the pumping light within the wave band range of the pumping light, the double-cladding optical fiber is arranged outside the first grating and is provided with a package structure, and both ends of the double-cladding optical fiber respectively extend out of both ends of the package structure and are used for connecting other optical fibre or fiber optic components. One end of the first grating can also be provided with a second grating used for reflecting signal light transmitted from a fiber core. The grating reflector can be manufactured as an independent device, or can be directly manufactured on pumped active optical fiber. The grating reflector is especially suitable for an optical fiber laser and an optical fiber amplifier of cladding pumping, can effectively reduce the leakage of the pumping light, and enhances the pumping efficiency.
Description
Technical field
The present invention relates to a kind of grating reflector, particularly a kind of cladding pumping grating reverberator is used to reduce pumping and leaks, improves pumping efficiency, belongs to laser technology field.
Technical background
Cladding pumping is to utilize the covering than big hundreds of times to thousands of times of core cross sections area to transmit pump light.Cladding-pumped fiber is a kind of Active Optical Fiber, and fibre core can absorptive pumping light and excited.By also there not being absorbed pump light behind the Active Optical Fiber, be that pumping is leaked, the initial pump luminous power deducts the remaining sum after pumping is leaked and the ratio of initial pump luminous power, is the pumping utilization factor.
Optical fiber parameter compares homogeneous cladding pumping Active Optical Fiber in the longitudinal direction, the absorption coefficient of its pump light changes very little, the decay of pump light is the index decreased relation basically, and along with the increase from the pumping source distance, the pumping utilization factor of Active Optical Fiber also is index decreased in the unit length.If with the pumping utilization factor is that the length of 90% Active Optical Fiber is 1 long measure, so, begin to calculate from the pumping point, the pumping utilization factor of first long measure is 90%, the pumping utilization factor of second long measure is that the pumping utilization factor of 9%, the three long measure is 0.9%, and the rest may be inferred, long measure of every increase, the pumping utilization factor will reduce an order of magnitude.
Because cladding pumping Active Optical Fiber price comparison costliness so it is very uneconomical to improve the pumping utilization factor with long Active Optical Fiber in the product that adopts cladding-pumped fiber, considers from cost factor, should suitably increases pumping and leak, reduces Active Optical Fiber length.For the high power cladding pumping optical fibre device, nonlinear effect is very outstanding, under the constant situation of other conditions, reduces the length of Active Optical Fiber, helps reducing nonlinear effect.In addition, the increase of Active Optical Fiber length can obviously increase noise, and this is very harmful for the fibre-optical active component of fiber amplifier one class, so, reduce the length of Active Optical Fiber, help improving the performance of clad pumping optical fiber device.
But, reduce Active Optical Fiber length as far as possible and reduce pumping as far as possible and leak and to be difficult between the two take into account.For the cladding-pumped fiber active device, pumping source, cladding-pumped fiber and pump power coupling device are its main cost structure parts, reduce the length of Active Optical Fiber, mean bigger pumping leakage.Under the high power situation, pumping is leaked often very big, and this part pumping is leaked and not only formed the huge wasting of resources, and can produce serious thermal effect and bring unsafe factor, and this shows: it is technical barrier of the prior art that pumping is leaked; Therefore, need a kind of Active Optical Fiber length that can reduce to reduce the technical solution that pumping is leaked again.
Summary of the invention
In view of this, purpose of the present invention, the fibre-optical active component for cladding pumping provides a kind of effective minimizing Active Optical Fiber length and the technical scheme that improves pump absorption efficient exactly; Under the situation of high power signals output, can reduce the length of Active Optical Fiber significantly and reduce pumping and leak, thereby reduce nonlinear effect, reduce noise and reduce cost.
To achieve these goals, the invention provides a kind of grating reflector, it is by first optical grating constitution of doubly clad optical fiber and portion's setting within it, the reflectivity of this first grating pair pumping light power is the bigger the better, span is more than 70%, the reflectivity of the flashlight of transmission is low more good more in this grating pair fibre core, and span is below 2%; Doubly clad optical fiber comprises fibre core, inner cladding, surrounding layer and external protection; Doubly clad optical fiber is provided with the region exterior of first grating, is provided with encapsulating structure, and the regional seal that encapsulating structure will be provided with first grating covers; The two ends of doubly clad optical fiber are stretched out respectively by the encapsulating structure two ends, are used for being connected with other optical fiber or fiber optic component.
Encapsulating structure is made up of protection overlay, first structure of fiber_optic, shell, tackifier and fluid sealant etc. with temperature compensation function; Wherein, the protection overlay axially is wrapped in first grating outside, covers the zone that does not have external protection, is used to protect the doubly clad optical fiber and first grating; Described doubly clad optical fiber is provided with the outside, two ends of first grating region, sticks with glue agent and is fixed on first structure of fiber_optic; First structure of fiber_optic and shell are fixed together with fluid sealant; The remainder that described shell will constitute described grating reflector wraps up wherein, and the two ends of doubly clad optical fiber extend out naturally from the shell two ends, at the shell two ends, adopts fluid sealant doubly clad optical fiber and shell to be fixed into the integral body of a sealing.
On above-mentioned doubly clad optical fiber, also second grating can be set, be used to reflect the flashlight of transmission in the fibre core; The adjacent setting of second grating with first grating, described encapsulating structure covers the regional seal that first grating and second grating are set on the doubly clad optical fiber; The two ends of encapsulating structure are extended at the two ends of described doubly clad optical fiber respectively, are used for being connected with other optical fiber or fiber optic component; The two ends of encapsulating structure are fixed on the doubly clad optical fiber with fluid sealant.
Be provided with the grating reflector of second grating, also be provided with second structure of fiber_optic in its encapsulating structure with temperature compensation function, the protection overlay axially is wrapped in first grating and second grating outside, covering does not have the zone of external protection, is used to protect doubly clad optical fiber, first grating and second grating; Doubly clad optical fiber is provided with the outside, two ends of second grating region, sticks with glue agent and is fixed on second structure of fiber_optic; First structure of fiber_optic and second structure of fiber_optic are separately fixed at fluid sealant with shell; The remainder that shell will constitute described grating reflector wraps up wherein, and the two ends of doubly clad optical fiber extend out naturally from the shell two ends, at the shell two ends, adopts fluid sealant doubly clad optical fiber and shell to be fixed into the integral body of a sealing.
The fibre core and the inner cladding of described doubly clad optical fiber have photosensitivity to ultraviolet light; Whether the surrounding layer of described doubly clad optical fiber has photosensitivity to ultraviolet light all can.
The cross-sectional sizes at the two ends of described doubly clad optical fiber is identical or different.
By above-mentioned technical scheme as can be known: grating reflector of the present invention is reflected after making pump light arrive grating, places grating reflector of the present invention at the end of double clad pumping Active Optical Fiber pump light transmission, just can make pump light reflected back double-cladding active optical fiber.
For the situation that needs reflected signal light, use the grating reflector that is provided with second grating, wherein the reflectivity of the second optical grating reflection flashlight is determined according to actual needs.The encapsulation of this integrated grating, the temperature compensation of reflection of pump power grating and signal reflex grating requires different, the reflection of pump power grating requires the temperature drift coupling with the pump light wavelength, and the signal reflex grating requires the wavelength of reflection stable as far as possible, therefore, two kinds of supports that grating need use different compensation to require in this integrated device.During use, generally the end with reflected pump light is connected with Active Optical Fiber.
Utilize method of the present invention to make and the placement grating, effectively utilized the pump light that will be leaked under the unidirectional pumping situation, improved pumping efficiency, same pump power can obtain bigger output power signal.
Utilize method making of the present invention and place grating, hang down under the situation of pumping leakage, can effectively reduce the length of Active Optical Fiber, thereby save cost, and under different situations, bring into play vital role such as reducing nonlinear effect or reduction noise in maintenance.Especially to the situation of high power signals output, act on more obvious.
Description of drawings
Fig. 1 is the structural representation of grating reflector of the present invention.
Fig. 2 is the structural representation that comprises the grating reflector of first grating and second grating.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Referring to Fig. 1, the grating reflector of present embodiment, one first grating 2 by doubly clad optical fiber 1 and setting thereon constitutes, the reflectivity of 2 pairs of flashlights of this first grating is the bigger the better, span is more than 90%, reflectivity to the flashlight that transmits in the fibre core is low more good more, and span is below 2%; Doubly clad optical fiber 1 comprises fibre core 4, inner cladding 5, surrounding layer 6 and external protection 7; First grating is made simultaneously on fibre core 4 and inner cladding 5 and is formed, and first grating 2 adopts the chirp grating expansion to pump light spectrum of reflected light scope; Doubly clad optical fiber 1 is provided with the region exterior of first grating 2, is provided with encapsulating structure 3, and the regional seal that encapsulating structure 3 is provided with first grating 2 covers; The two ends of encapsulating structure 3 are extended at the two ends of doubly clad optical fiber 1 respectively, are used for being connected with other optical fiber or fiber optic component.
Encapsulating structure 3 is made up of protection overlay 8, first structure of fiber_optic 9, shell 10, tackifier 11 and fluid sealant 12 with temperature compensation function; Wherein, protection overlay 8 axially covers and is wrapped in first grating, 2 outsides, covers the zone that does not have external protection 7, is used to protect doubly clad optical fiber 1 and grating 2; Doubly clad optical fiber 1 is provided with the outside, two ends in first grating, 2 zones, sticks with glue agent 11 and is fixed on first structure of fiber_optic 9; First structure of fiber_optic 9 is fixed together with shell 10 usefulness fluid sealants 12; The remainder that shell 10 will constitute grating reflector wraps up wherein, and the two ends of doubly clad optical fiber 1 extend out naturally from shell 10 two ends, at shell 10 two ends, adopts fluid sealant 12 doubly clad optical fiber 1 and shell 10 to be fixed into the integral body of a sealing.
The material that temperature compensation support 9 is selected should make the wavelength of grating 2 reflections mate with the drift of temperature with the pump light wavelength with the drift of temperature.
The cross-sectional sizes at the two ends of doubly clad optical fiber 1 is identical or different.
Adopt the UV photosensitive legal system to make grating, the fibre core 4 of doubly clad optical fiber 1 and inner cladding 5 reply ultraviolet lights have photosensitivity; Whether 6 pairs of ultraviolet lights of the surrounding layer of doubly clad optical fiber 1 have photosensitivity all can.Any end of present embodiment grating reflector can be used as the reflection of pump power end, and the other end is as signal output part, and device does not have directivity.
Doubly clad optical fiber 1 can be the Active Optical Fiber that fibre core has absorptive pumping luminous energy power, also can be pump light is absorbed very low passive fiber.
After grating reflector completes and encapsulates, can be used as an independent devices.
Another kind of grating reflector of the present invention, its grating can directly be made on by the double-cladding active optical fiber of pumping, be same piece optical fiber by the Active Optical Fiber of pumping and grating this moment, grating and be need not welding between the Active Optical Fiber of pumping, and optical path loss is lower, structure compactness more.
Referring to Fig. 2, in embodiment 1 described grating reflector, increase by second grating 13 that is used for reflected signal light, be used to reflect the flashlight of transmission in the fibre core, second grating 13 can have higher reflectivity as required, also can have lower reflectivity, as be used for the higher reflectivity of resonator cavity completely reflecting mirror needs of fiber laser, be used for the lower reflectivity of outgoing mirror needs; Second grating 13 and the 2 adjacent settings of first grating, encapsulating structure 3 covers the regional seal that first grating 2 and second grating 13 are set on the doubly clad optical fiber 1; The two ends of encapsulating structure 3 are extended at the two ends of doubly clad optical fiber 1 respectively, are used for being connected with other optical fiber or fiber optic component.
During encapsulation, second grating 13 should adopt the temperature compensation support 14 different with first grating 2, makes the wavelength of second grating, 13 reflections keep stable when temperature variation as far as possible.First structure of fiber_optic 9 is used for the optical grating reflection peak wavelength with the temperature compensation with the drift coupling of temperature of the drift of temperature and pump light peak wavelength, and second structure of fiber_optic 14 is used for the signal light wavelength of steady reflection.
Identical with embodiment 1, the present invention also comprises another kind of grating reflector, its grating can directly be made on by the double-cladding active optical fiber of pumping, be same piece optical fiber by the Active Optical Fiber of pumping and grating this moment, grating and be need not welding between the Active Optical Fiber of pumping, optical path loss is lower, structure is compact more.
The described grating reflector of present embodiment is applicable to the fiber laser of cladding pumping.
It should be noted that at last: above embodiment is only in order to illustrating technical scheme of the present invention, and is not to its restriction.Although the present invention is had been described in detail with reference to above-mentioned preferred embodiment, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention.And not breaking away from the essence of technical solution of the present invention, it all should be encompassed among the scope of claim of the present invention.
Claims (7)
1, a kind of grating reflector is characterized in that: by doubly clad optical fiber (1) and within it first grating (2) that is provided with of portion constitute, this first grating (2) to the reflectivity of pumping light power greater than 70%, to the reflectivity of the flashlight that transmits in the fibre core less than 2%; Doubly clad optical fiber (1) is made of fibre core (4), inner cladding (5), surrounding layer (6) and external protection (7); Described doubly clad optical fiber (1) is provided with the region exterior of first grating (2), is provided with encapsulating structure (3), and the zone that described encapsulating structure (3) will be provided with first grating (2) covers; The two ends of encapsulating structure (3) are extended at the two ends of described doubly clad optical fiber (1) respectively, are used for being connected with other optical fiber or fiber optic component.
2, grating reflector according to claim 1 is characterized in that, described encapsulating structure (3) is made up of protection overlay (8), first structure of fiber_optic (9) with temperature compensation function, shell (10), tackifier (11) and fluid sealant (12); Wherein, described protection overlay (8) axially is wrapped in first grating (2) outside, covers the zone that does not have external protection (7), is used to protect doubly clad optical fiber (1) and first grating (2); Described doubly clad optical fiber (1) is provided with the outside, two ends in first grating (2) zone, sticks with glue agent (11) and is fixed on first structure of fiber_optic (9); First structure of fiber_optic (9) is fixed together with fluid sealant (12) with shell (10); The remainder that described shell (10) will constitute described grating reflector wraps up wherein, and the two ends of doubly clad optical fiber (1) extend to outside shell (10) two ends, and fluid sealant (12) is fixed into doubly clad optical fiber (1) and shell (10) integral body of a sealing.
3, grating reflector according to claim 1 and 2 is characterized in that: second grating (13) also is set on the described doubly clad optical fiber (1), is used to reflect the flashlight of transmission in the fibre core; Second grating (13) and the adjacent setting of first grating (2), described encapsulating structure (3) covers the regional seal that described doubly clad optical fiber (1) is provided with first grating (2) and second grating (13); The two ends of encapsulating structure (3) are extended at the two ends of described doubly clad optical fiber (1) respectively, are used for being connected with other optical fiber or fiber optic component.
4, grating reflector according to claim 3, it is characterized in that: also be provided with second structure of fiber_optic (14) in the described encapsulating structure (3) with temperature compensation function, described protection overlay (8) axially is wrapped in first grating (2) and the outer survey of second grating (13), covering does not have the zone of external protection (7), is used to protect doubly clad optical fiber (1), first grating (2) and second grating (13); Described doubly clad optical fiber (1) is provided with the outside, two ends in second grating (13) zone, sticks with glue agent (11) and is fixed on second structure of fiber_optic (14); First structure of fiber_optic (9) and second structure of fiber_optic (14) are separately fixed at fluid sealant (12) with shell (10).
5, grating reflector according to claim 1 is characterized in that: described doubly clad optical fiber (1) is double-cladding active optical fiber or double clad passive fiber.
6, grating reflector according to claim 1 is characterized in that: the fibre core (4) and the inner cladding (5) of described doubly clad optical fiber (1) have photosensitivity to ultraviolet light; The surrounding layer (6) of described doubly clad optical fiber (1) is for having or do not have the medium of light sensitive characteristic to ultraviolet light.
7, grating reflector according to claim 1, device is characterised in that: the cross-sectional sizes at the two ends of described doubly clad optical fiber (1) is identical or different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100596792A CN100345055C (en) | 2005-03-31 | 2005-03-31 | Raster reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100596792A CN100345055C (en) | 2005-03-31 | 2005-03-31 | Raster reflector |
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| Publication Number | Publication Date |
|---|---|
| CN1652007A CN1652007A (en) | 2005-08-10 |
| CN100345055C true CN100345055C (en) | 2007-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100596792A Expired - Fee Related CN100345055C (en) | 2005-03-31 | 2005-03-31 | Raster reflector |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746283A (en) * | 2014-01-29 | 2014-04-23 | 广东高聚激光有限公司 | Method for improving pumping efficiency of fiber laser and fiber laser thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1117325A (en) * | 1993-01-29 | 1996-02-21 | 英国电讯公司 | Optical device packaging |
| US5710786A (en) * | 1995-08-25 | 1998-01-20 | Sdl, Inc. | Optical fibre laser pump source for fibre amplifiers |
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
-
2005
- 2005-03-31 CN CNB2005100596792A patent/CN100345055C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1117325A (en) * | 1993-01-29 | 1996-02-21 | 英国电讯公司 | Optical device packaging |
| US5710786A (en) * | 1995-08-25 | 1998-01-20 | Sdl, Inc. | Optical fibre laser pump source for fibre amplifiers |
| CN1581607A (en) * | 2003-11-06 | 2005-02-16 | 中国科学院长春光学精密机械与物理研究所 | Wavelength tunable dual-cladding-layer optical fiber laser |
Non-Patent Citations (3)
| Title |
|---|
| 光纤光栅温度补偿原理 戎小戈，广西物理，第23卷第2期 2002 * |
| 光纤光栅激光器 宁提纲，张劲松，裴丽，简水生，光通信研究，第3期 2000 * |
| 基于光纤光栅谐振腔的双包层光纤激光器 张春林，赵岭，李丽娜，张亮，王立军，半导体光电，第25卷第6期 2004 * |
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| Publication number | Publication date |
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| CN1652007A (en) | 2005-08-10 |
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