CN105742947A - System for inhibiting ASE in back-pumped double-cladding fiber laser amplifier - Google Patents
System for inhibiting ASE in back-pumped double-cladding fiber laser amplifier Download PDFInfo
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- CN105742947A CN105742947A CN201610240439.0A CN201610240439A CN105742947A CN 105742947 A CN105742947 A CN 105742947A CN 201610240439 A CN201610240439 A CN 201610240439A CN 105742947 A CN105742947 A CN 105742947A
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- optical fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06795—Fibre lasers with superfluorescent emission, e.g. amplified spontaneous emission sources for fibre laser gyrometers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a system for inhibiting ASE in a back-pumped double-cladding fiber laser amplifier. The system comprises a laser seed source, an optical fiber circulator, a double-cladding active fiber, a pumping source, a fiber beam combiner and a fiber end cap, wherein the double-cladding active fiber generates forwardly transmitted ASE light and backwardly transmitted ASE light in the amplifying process; the forward ASE light and signal light pass through the fiber beam combiner and the fiber end cap and are output; the backward ASE light enters an inner cladding layer of the double-cladding active fiber through the optical fiber circulator and the fiber beam combiner at the front end of the double-cladding active fiber to form a feedback; and the power of the forward ASE light at the output end is reduced. Compared with the prior art, spontaneous emission amplification is inhibited in a cladding layer feedback manner; other filter devices are not needed; the power of the output ASE light can be effectively reduced; the structure is simple and compact; the defect that in a back-pumped structure, the ASE light is relatively high can be effectively overcome; and the output signal to noise ratio is improved.
Description
Technical field
The present invention relates to double-cladding fiber laser amplifier region, particularly relate to and a kind of suppress the system of ASE in backward pumping double-cladding fiber laser amplifier.
Background technology
For obtaining high power, the output of high performance optical-fiber laser, prior art generally adopts master oscillator power amplifier (MOPA) structure.Spontaneous radiation is amplified (ASE) and is originated as the main noise in amplification process, directly affects the signal to noise ratio of output light.Fiber amplifier pumping configuration conventional at present includes: forward pumping and backward pumping two kinds, compared with forward pumping structure, counter-pumping configuration is capable of higher slope efficiency, and nonlinear effect has certain inhibitory action, is advantageously implemented the laser output of high power narrow linewidth.But, there is the problem that ASE is stronger in the amplifier of counter-pumping configuration, affects the signal to noise ratio of Output of laser, limits its application in high power laser light amplifier, particularly cascade MOPA.
In existing technology, in order to improve signal to noise ratio, generally require and connect the filtering devices such as fiber grating (FBG) or narrow band filter (NBF) at amplifier out to filter ASE light.
Inventor is in the process realizing the present invention, it has been found that at least suffer from the drawback that in prior art and not enough:
Above-mentioned solution inevitably adds the complexity of laser link loss and amplification system；Additionally, FBG and the NBF difficulty making doubly clad optical fiber coupling is big, cost is high.
Summary of the invention
In order to solve the problems referred to above, improving the signal to noise ratio of optical-fiber laser MOPA, it is achieved efficient laser output, the present invention proposes a kind of system of ASE in backward pumping double-cladding fiber laser amplifier that suppresses, described below:
A kind of suppress the system of ASE in backward pumping double-cladding fiber laser amplifier, described system includes: laser seed source, optical fiber circulator, double-cladding active optical fiber and pumping source, flashlight is launched in described laser seed source, flashlight inputs via described optical fiber circulator, enters the fibre core of described double-cladding active optical fiber；Described system also includes: optical-fiber bundling device and optical fiber end emit,
The pump light that described pumping source is launched is coupled into the covering of described double-cladding active optical fiber by described optical-fiber bundling device, it is achieved backward pumping；Described double-cladding active optical fiber absorptive pumping light, forms population inversion, provides gain to flashlight；
In amplification process, producing the ASE light of forward transmission and the ASE light of reverse transfer in double-cladding active optical fiber, forward ASE light emits output through described optical-fiber bundling device and described optical fiber end together with flashlight,
Reverse ASE light passes through the optical fiber circulator of double-cladding active optical fiber front end and the inner cladding of optical-fiber bundling device entrance double-cladding active optical fiber, forms feedback, reduces the power of outfan forward ASE light.
Further, described reverse ASE light enters the inner cladding of double-cladding active optical fiber by the optical fiber circulator of double-cladding active optical fiber front end and optical-fiber bundling device, forms feedback, reduce the power of outfan forward ASE light particularly as follows:
After reverse ASE light enters the inner cladding of double-cladding active optical fiber, mix with pump light, the inner cladding of double-cladding active optical fiber transmits, during by the fibre core of double-cladding active optical fiber, consume the partial inversion population on corresponding A SE wavelength in fibre core, the inverted population of forward ASE light corresponding wavelength reduces accordingly, and the forward ASE light of outfan is suppressed.
Further, described system also includes: cladding light detacher,
Described cladding light detacher is placed between optical fiber circulator and double-cladding active optical fiber, is used for divesting remnant pump light and part reversely ASE light.
Technical scheme provided by the invention provides the benefit that: the present invention, by feeding back in the inner cladding of double-cladding active optical fiber by part reversely ASE, consumes the inverted population on corresponding energy level, plays reduction forward ASE, improves the effect of outfan signal to noise ratio.This system is without other filtering devices, simple and compact for structure, contributes to realizing the laser output of high power, high s/n ratio.
Accompanying drawing explanation
Fig. 1 provided by the invention a kind of suppresses the structural representation of the system of ASE in backward pumping double-cladding fiber laser amplifier.
In accompanying drawing, the list of parts representated by each label is as follows:
1: laser seed source；2: optical fiber circulator；
3: cladding light detacher；4: double-cladding active optical fiber；
5: optical-fiber bundling device；6: pumping source；
7: optical fiber end emits；A: the first port of optical fiber circulator 2；
B: the second port of optical fiber circulator 2；C: the 3rd port of optical fiber circulator 2.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
A kind of the design principle of the system of ASE in backward pumping double-cladding fiber laser amplifier is suppressed to be described in detail below in conjunction with what the embodiment of the present invention was provided by Fig. 1:
In embodiments of the present invention, by optical fiber circulator 2 and optical-fiber bundling device 5 by the ASE of the part reverse transfer inner cladding optically coupling to double-cladding active optical fiber 4, it is provided that feedback.So the advantage of design is: after reversely ASE light enters the inner cladding of double-cladding active optical fiber 4, mix with pump light, the inner cladding of double-cladding active optical fiber 4 transmits, during by the fibre core of double-cladding active optical fiber 4, consume the partial inversion population on corresponding A SE wavelength in fibre core, the inverted population of forward ASE corresponding wavelength reduces accordingly, and the forward ASE light of outfan is suppressed.
From above-mentioned design principle it can be seen that embodiment of the present invention designed system is without other complex filters parts, can realize suppressing the effect of ASE light output, contribute to realizing high power, high s/n ratio in actual applications, the laser output of narrow linewidth.
Embodiment 1
Based on above-mentioned design principle, referring to Fig. 1, a kind of of embodiment of the present invention offer suppresses the system of ASE in backward pumping double-cladding fiber laser amplifier to include with lower component: laser seed source 1, optical fiber circulator 2, double-cladding active optical fiber 4, optical-fiber bundling device 5, pumping source 6 and optical fiber end emit 7.Wherein,
Flashlight is launched in laser seed source 1, and flashlight inputs via optical fiber circulator 2, enters the fibre core of double-cladding active optical fiber 4；
The pump light that pumping source 6 is launched is coupled into the covering of double-cladding active optical fiber 4 by optical-fiber bundling device 5, it is achieved backward pumping；Double-cladding active optical fiber 4 absorptive pumping light, forms population inversion, provides gain to flashlight；
In amplification process, producing the ASE light of forward transmission and the ASE light of reverse transfer in double-cladding active optical fiber 4, forward ASE light emits 7 outputs through optical-fiber bundling device 5 and optical fiber end together with flashlight,
Reverse ASE light enters the inner cladding of double-cladding active optical fiber 4 by the optical fiber circulator 2 of double-cladding active optical fiber 4 front end and optical-fiber bundling device 5, forms feedback, reduces the power of outfan forward ASE light.
In sum, embodiments provide and a kind of suppress the system of ASE in backward pumping double-cladding fiber laser amplifier, by part reversely ASE is fed back optically coupling to realization in the inner cladding of double-cladding active optical fiber, extract the inverted population on ASE correspondence energy level, inhibit the ASE light in forward output light, improve output signal-to-noise ratio.Native system, without other filtering devices, has simple in construction, delivery efficiency advantages of higher.
Embodiment 2
Below in conjunction with Fig. 1, the scheme in embodiment 1 is set forth further, described below:
Flashlight is launched in laser seed source, and flashlight, via the first port A input of optical fiber circulator 2, the second port B output, enters the fibre core of double-cladding active optical fiber 4.Pumping source 6 is optical fiber coupling output, and the pump light that pumping source 6 is launched is coupled into the covering of double-cladding active optical fiber 4 by the pumping end of optical-fiber bundling device 5, it is achieved backward pumping；Double-cladding active optical fiber 4 absorptive pumping light, forms population inversion, provides gain to flashlight.Flashlight is amplified, and the flashlight after amplification emits 7 outputs via signal end and the optical fiber end of optical-fiber bundling device 5.
In amplification process, except the flashlight being exaggerated, in double-cladding active optical fiber 4, also produce the ASE light of forward transmission and the ASE light of reverse transfer.Forward ASE light emits 7 outputs through optical-fiber bundling device 5 and optical fiber end together with flashlight, reverse ASE light enters the second port B of the optical fiber circulator 2 of the front end phase welding with double-cladding active optical fiber 4, from the 3rd port C output of optical fiber circulator 2, enter the inner cladding of double-cladding active optical fiber 4 via the pumping end of optical-fiber bundling device 5, form feedback.
After reverse ASE light enters the inner cladding of double-cladding active optical fiber 4, mix with pump light, the inner cladding of double-cladding active optical fiber 4 transmits, during by the fibre core of double-cladding active optical fiber 4, consume the partial inversion population on corresponding A SE wavelength in fibre core, the inverted population of forward ASE corresponding wavelength reduces accordingly, and the forward ASE light of outfan is suppressed.
Simultaneously as the inverted population on corresponding signal light wavelength energy level is extracted by the flashlight that power is bigger, the conversion efficiency of output flashlight is substantially unaffected；Additionally, due to the reverse ASE light of feedback only in fibre core the part of transmission can pass through optical fiber circulator 2 and be fed back into double-cladding active optical fiber 4, can be prevented effectively to feed back and form by force lasing.
Wherein, this system also includes: cladding light detacher 3, cladding light detacher 3 is placed between optical fiber circulator 2 and double-cladding active optical fiber 4, for divesting remnant pump light and part reversely ASE light, when avoiding the single-mode fiber of optical fiber circulator 2 and double-cladding active optical fiber 4 directly fused, solder joint place remnant pump light and reverse ASE luminous power is too high burns device.
In sum, embodiment of the present invention designed system, without other complex filters parts, can realize suppressing the effect of ASE light output, contribute to realizing high power, high s/n ratio in actual applications, the laser output of narrow linewidth.
Embodiment 3
Below in conjunction with concrete type of device, size, the scheme in embodiment 1 and 2 is set forth further, described below:
System Working Principle in this embodiment is identical with embodiment 1 and 2 with the trend of signal, and this is not repeated by the embodiment of the present invention.
When implementing, laser seed source 1 output wavelength is 1550nm, and output optical fibre is 6/125 single-mode fiber；Optical fiber circulator 2 is optical fiber coupling device, optical fiber core diameter 6 μm；The optical fiber core diameter of cladding light detacher 36 μm, inner cladding diameter 125 μm；Double-cladding active optical fiber 4 is erbium-ytterbium co-doped fiber, fibre core and inner cladding diameter respectively 6 μm and 125 μm；Optical-fiber bundling device 5 is (2+1) × 1 optical-fiber bundling device, and signal segment optical fiber is 6/125 doubly clad optical fiber, and pumping end optical fiber is 105/125 multimode fibre；Pumping source 6 output wavelength is 976nm, and coupling output optical fibre is 105/125 multimode fibre.
When implementing, the output wavelength of pumping source 6 can be 976nm, it is also possible to be 915nm, can also be other wavelength when using the Active Optical Fiber of other ions that adulterate, as long as the absworption peak of corresponding Active Optical Fiber, the embodiment of the present invention is without limitation.
Wherein, double-cladding active optical fiber 4 can be erbium-ytterbium co-doped fiber, it is also possible to be the Active Optical Fiber of the conventional active ions such as erbium doped, ytterbium, thulium, holmium, neodymium, and signal light wavelengths corresponding different respectively, the embodiment of the present invention is without limitation.
Wherein, laser seed source 1 can be optical fiber laser, it is also possible to be semiconductor laser or other laser instrument, only need to meet its transmitting wavelength and be positioned at the gain spectral of double-cladding active optical fiber 4, and the embodiment of the present invention is without limitation.
Wherein, laser seed source 1 can be continuous wave operating, it is also possible to being modulation, adjust the operating of other forms such as Q, locked mode, the embodiment of the present invention is without limitation.
Wherein, pumping source 6 can be semiconductor laser, it is also possible to be the laser instrument of other forms such as optical fiber, solid.Its output wavelength can be 976nm, it is also possible to be 915nm, can also be other wavelength when using the Active Optical Fiber of other ions that adulterate, as long as the absworption peak of corresponding Active Optical Fiber, the embodiment of the present invention is without limitation.
In sum, embodiment of the present invention designed system, without other complex filters parts, can realize suppressing the effect of ASE light output, contribute to realizing high power, high s/n ratio in actual applications, the laser output of narrow linewidth.
The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as the device of above-mentioned functions can be completed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (3)
1. one kind is suppressed the system of ASE in backward pumping double-cladding fiber laser amplifier, described system includes: laser seed source, optical fiber circulator, double-cladding active optical fiber and pumping source, flashlight is launched in described laser seed source, flashlight inputs via described optical fiber circulator, enters the fibre core of described double-cladding active optical fiber；
It is characterized in that, described system also includes: optical-fiber bundling device and optical fiber end emit,
The pump light that described pumping source is launched is coupled into the covering of described double-cladding active optical fiber by described optical-fiber bundling device, it is achieved backward pumping；Described double-cladding active optical fiber absorptive pumping light, forms population inversion, provides gain to flashlight；
In amplification process, producing the ASE light of forward transmission and the ASE light of reverse transfer in double-cladding active optical fiber, forward ASE light emits output through described optical-fiber bundling device and described optical fiber end together with flashlight,
Reverse ASE light passes through the optical fiber circulator of double-cladding active optical fiber front end and the inner cladding of optical-fiber bundling device entrance double-cladding active optical fiber, forms feedback, reduces the power of outfan forward ASE light.
2. according to claim 1 a kind of suppress the system of ASE in backward pumping double-cladding fiber laser amplifier, it is characterized in that, described reverse ASE light passes through the optical fiber circulator of double-cladding active optical fiber front end and the inner cladding of optical-fiber bundling device entrance double-cladding active optical fiber, formed feedback, reduce outfan forward ASE light power particularly as follows:
After reverse ASE light enters the inner cladding of double-cladding active optical fiber, mix with pump light, the inner cladding of double-cladding active optical fiber transmits, during by the fibre core of double-cladding active optical fiber, consume the partial inversion population on corresponding A SE wavelength in fibre core, the inverted population of forward ASE light corresponding wavelength reduces accordingly, and the forward ASE light of outfan is suppressed.
3. according to claim 1 a kind of suppress the system of ASE in backward pumping double-cladding fiber laser amplifier, it is characterised in that described system also includes: cladding light detacher,
Described cladding light detacher is placed between optical fiber circulator and double-cladding active optical fiber, is used for divesting remnant pump light and part reversely ASE light.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610240439.0A CN105742947A (en) | 2016-04-15 | 2016-04-15 | System for inhibiting ASE in back-pumped double-cladding fiber laser amplifier |
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| CN201610240439.0A CN105742947A (en) | 2016-04-15 | 2016-04-15 | System for inhibiting ASE in back-pumped double-cladding fiber laser amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106451046A (en) * | 2016-11-17 | 2017-02-22 | 深圳番越光电有限公司 | Compact type linear-polarization and single-frequency all-fiber laser amplifier |
| CN106654825A (en) * | 2016-12-27 | 2017-05-10 | 中国科学院半导体研究所 | Fiber laser for simultaneously outputting nanosecond pulse and picosecond pulse |
| CN109405636A (en) * | 2018-10-24 | 2019-03-01 | 北京工业大学 | A kind of compacting interference method and apparatus of high-energy laser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451046A (en) * | 2016-11-17 | 2017-02-22 | 深圳番越光电有限公司 | Compact type linear-polarization and single-frequency all-fiber laser amplifier |
| CN106451046B (en) * | 2016-11-17 | 2019-09-20 | 深圳番越光电有限公司 | A kind of linear polarization single-frequency full optical fiber laser amplifier of compact |
| CN106654825A (en) * | 2016-12-27 | 2017-05-10 | 中国科学院半导体研究所 | Fiber laser for simultaneously outputting nanosecond pulse and picosecond pulse |
| CN106654825B (en) * | 2016-12-27 | 2019-12-03 | 中国科学院半导体研究所 | The optical fiber laser of nanosecond and picosecond pulse is exported simultaneously |
| CN109405636A (en) * | 2018-10-24 | 2019-03-01 | 北京工业大学 | A kind of compacting interference method and apparatus of high-energy laser |
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Application publication date: 20160706 |