CN207559263U - A kind of high efficiency all -fiber column vector beam laser - Google Patents
A kind of high efficiency all -fiber column vector beam laser Download PDFInfo
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- CN207559263U CN207559263U CN201721719797.6U CN201721719797U CN207559263U CN 207559263 U CN207559263 U CN 207559263U CN 201721719797 U CN201721719797 U CN 201721719797U CN 207559263 U CN207559263 U CN 207559263U
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Abstract
The utility model discloses a kind of high efficiency all -fiber column vector beam lasers, since few mould long-period fiber grating can realize basic mode to the high efficiency conversion of single order pattern in resonance wave strong point and have the characteristic of low insertion loss, it is used as mode converter part by that will lack in mould long-period fiber grating introducing laser cavity, improve mode conversion efficiency, cavity loss is reduced, to realize that the high efficiency of column vector laser beam exports.The laser includes amplifier module, for providing laser generation and amplification；Resonant tank module is used to implement laser resonance；Polarization Control Module, for laser polarization state in control chamber；And mode conversion module lacks mould long-period fiber grating, is used to implement high efficiency mode conversion.There is the column vector beam of the laser output high efficiency, Low threshold, high-purity, pattern the characteristics such as can be switched, and not have Space Coupling structure, stability height, good portability, suitable commercialization.
Description
Technical field
The utility model is related to optical fiber laser field more particularly to the high efficiency column based on few mould long-period fiber grating
Vector beam laser.
Background technology
Different from common light beam, the polarization direction that column vector just refers on the cross section of light beam is divided with column symmetry
Cloth, and its transverse intensity distribution of light beam is annular, generally can be divided into angular and radial polarisation light.
The particular polarization and amplitude response that column vector light has allow it to apply in many fields, and such as particle is grasped
The fields such as control, material processing, plasma exciatiaon, optical storage, super-resolution micro-imaging, optic communication.
Due to all -fiber column vector laser compared to the column vector laser with Space Coupling structure with portable
Good, stability is good, it is small the features such as, obtained extensive research.But it reports at present (such as：Chinese patent
CN102544999A in all -fiber column vector laser), majority is using the coupling of the dislocation welding of single mode optical fiber and less fundamental mode optical fibre
Realize conversion of the basic mode to single order pattern, mode conversion efficiency efficiency is low (being less than 20 percent)；And due to phase misalignment
With bringing larger cavity loss；It is employed simultaneously in order to which basic mode light beam is inhibited to export with ensureing the output purity of single order pattern
High reflectance outgoing mirror, it is difficult to be optimal output coupling ratio and limit output power；More than reason leads to the pump light of input
Power requirement is higher, it is often more important that is difficult to realize efficient all -fiber column vector laser output.In addition, magnitude of misalignment need to pass through
It manually adjusts, it is difficult to be precisely controlled, increase the complexity and uncertainty of experiment.
Utility model content
The purpose of the utility model is to overcome the deficiencies described in background technology, propose a kind of high efficiency column vector light
Beam laser has the spies such as lasing efficiency high, threshold value is low, experiment is convenient, simple in structure, purity is high, stability is high, good portability
Point.
The technical scheme in the invention for solving the technical problem is：
A kind of high efficiency all -fiber column vector beam laser, it is characterised in that：Including amplifier module, pattern modulus of conversion
Block, Polarization Control Module, resonant tank module, wherein：
The amplifier module can be that pumping source, wavelength division multiplexer and gain media are formed, and the pumping source is partly leads
Volumetric laser diode is connected with the reflection end of wavelength division multiplexer, and the gain media being connected to the common end with wavelength division multiplexer is defeated
Enter continuous laser, laser generates and amplification, generated laser are basic mode for providing；The gain media is rare earth doped
Ion optical fiber；Optical fiber used in the amplifier module is all single mode optical fiber, and single mode optical fiber only supports basic mode to transmit；The amplification
Total reflection mirror and mode conversion module in the block with resonator mode are connected respectively at device module both ends.
The mode conversion module can be few mould long-period fiber grating, respectively with amplifier module resonant cavity
Mould partially reflecting mirror in the block is connected；Few mould long-period fiber grating refers to inscribe long period light on less fundamental mode optical fibre
When meeting resonance condition, the conversion from basic mode to single order pattern can be realized in resonance wave strong point for grid, long due to making few mould
Typically uni-directional inscription during period optical fiber grating has polarization dependent behavior, and incident basic mode light beam is adjusted by Polarization Control Module
The excitation of the polarization state property of may be selected by radially and angularly polarize, and mode conversion efficiency is high, insertion loss is small；Described lacks
Mode fiber is not only can support basic mode that can also support the optical fiber of single order pattern.
The Polarization Control Module can be Polarization Controller, be added in amplifier module and few mould long period optical fiber light
Among grid, for adjusting the polarization state for the basic mode light being incident in few mould long-period fiber grating, realize selectively with it is adjustable
Single order pattern is excited humorously；The single order pattern includes radially and angularly polarised light i.e. TM01And TE01Pattern；
The resonant tank module can be made of a total reflection mirror and partially reflecting mirror；The total reflection mirror and portion
It can be wide range reflection or narrow spectrum reflection to divide speculum, and implementation method can be profile of optic fibre plated film, plug lattice nanogram ring, optical fiber
Grating；The partially reflecting mirror is as output cavity mirror；
Wherein, basic mode laser being generated by amplifier module and amplified, basic mode laser changes polarization state by Polarization Controller,
Few mould long-period fiber grating is again incident on, near resonant wavelength, expeditiously and selectively inspires single order pattern,
It is exactly radially and angularly polarization mode；Radially and angularly polarization mode reaches partially reflecting mirror, some output, and a part is anti-
Intracavitary is emitted back towards, basic mode is coupled back into using few mould long-period fiber grating, basic mode continues to amplify by amplifier module, then through complete
Speculum is reflected back intracavitary and realizes complete laser operation；Due to few mould long-period fiber grating have height mode transfer efficiency and
The characteristic of low insertion loss can realize the efficient selectivity output of angular and radial polarization pattern.
Wherein, the laser cavity between total reflection mirror and few mould long-period fiber grating is basic mode operating, grows week in few mould
Laser cavity between phase fiber grating and part total reflection mirror is angular or radial polarization pattern operating.
The beneficial effects of the utility model are mainly manifested in：
The utility model has height mode transformation efficiency and undershoot using few mould long-period fiber grating in resonance wave strong point
Enter loss characteristic, realize that high efficiency mode is converted by introducing few mould long-period fiber grating in laser cavity, reduce intracavitary damage
Consumption realizes the high efficiency output of column vector laser beam.Compared to the column vector laser reported before, not only with full light
The features such as good portability of fine column vector laser and good stability, and more convenient, threshold value is lower, laser slope with testing
The features such as more efficient.
Description of the drawings
The attached drawing used in the embodiment that is proposed will briefly be introduced below, to be illustrated more clearly that this reality
With the technical solution of new embodiment, it is clear that drawings described below is only some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the high efficiency all -fiber column vector beam laser die block diagram of the utility model.
Reference numeral meaning is in figure：121 be the first reflecting module, and 111 be amplification module, and 131 be Polarization Control Module,
141 be mode conversion module, and 122 be the second reflecting module.
Fig. 2 is the high efficiency all -fiber column vector beam laser structure figure of the utility model.
Reference numeral meaning is in figure：211 be pumping source, and 212 be wavelength division multiplexer, and 213 be doping with rare-earth ions optical fiber,
221 be total reflection mirror, and 222 be partially reflecting mirror, and 231 be Polarization Controller, and 241 be few mould long-period fiber grating.
Specific embodiment
Before the structure for specifically describing embodiment, brief description first is carried out to few mould long-period fiber grating theory.
Few mould long-period fiber grating is using ultraviolet laser technology, femtosecond laser technology, electric arc skill in less fundamental mode optical fibre
Art, the micro-bend technology of machinery, CO2The technologies such as laser carry out inscribing making, few mould long-period fiber grating resonance wave
It grows in the range of doped fiber emission spectra and in the reflected wavelength range of two reflectings surface.The less fundamental mode optical fibre is aim
One, which changes frequency V, is more than 2.405, can support the optical fiber of few mould or multimode transmissions.Because TM01And TE01Mould belongs to First-Order Mode
Formula, so we generally take 2.405<V<3.8, optical fiber can support TM01And TE01Pattern, and can be to avoid the pattern of high-order
The interference brought.It is similar with the long-period gratings being scribed in single mode optical fiber, when resonance condition is met, incident basic mode meeting
It is coupled in higher order mode in grating region, the difference is that single mode long-period fiber grating can be coupled on cladding mode, and
Single order pattern needed for us can be coupled to for few mould long-period fiber grating, mode conversion efficiency can be more than 99%, and
And insertion loss is low can be down to 0.01dB.Few mould long-period fiber grating is usually unidirectional non-homogeneous inscription, and pattern conversion has
Polarization dependent behavior with selective exitation and can export TM by adjusting the polarization state of incident basic mode light beam01And TE01Pattern.
By more than theory analysis, the utility model is by few mould with height mode transfer efficiency and low insertion loss characteristic
Long-period fiber grating introduces in laser cavity the output for realizing column vector laser beam.
As shown in Figure 1, a kind of high efficiency all -fiber column vector beam laser, including amplification module 111, resonant tank module
(being made of the first reflecting module 121 and the second reflecting module 122), Polarization Control Module 131, mode conversion module 141.Wherein
Amplification module 111 is used to generate basic mode and amplify；Resonant tank module forms laserresonator by two reflecting modules 121 and 122
Realize laser resonance；Polarization Control Module 131 realizes the control to endovenous laser polarization state with implementation pattern selection function；Pattern
Modular converter 141 realizes the conversion to single order pattern to basic mode；It is possible thereby to realize column vector beam TM01And TE01Pattern
It is tunable, high efficiency output.
Referring to illustration is implemented, the embodiment of the utility model is described in detail.
As shown in Fig. 2, pumping source 211 can be semiconductor laser diode is coupled to laser by wavelength division multiplexer 212
Intracavitary is injected on doping with rare-earth ions optical fiber 213 and generates basic mode and amplify.Total reflection mirror 221 is connected with wavelength division multiplexer 212
As a speculum in resonator, basic mode light beam is reflected back intracavitary and participates in resonance, 231 one end of Polarization Controller and doping
Rare earth ion optical fiber 213 is connected, and the other end is connected with few mould long-period fiber grating 241.Few mould long period optical fiber light
Grid 241 are scribed on less fundamental mode optical fibre, and in resonance wave strong point, incident basic mode can be transformed into single order pattern in grating region
In, transfer efficiency can be more than 99%, and insertion loss is low can be down to 0.01dB.Partially reflecting mirror 222 and few mould long period
Fiber grating 241 is connected, the output cavity mirror as laser.When the basic mode of few mould long-period fiber grating 241 is incident in change
The polarization state of light, selective excitation TM01Or TE01Pattern, the two pattern parts pass through partially reflective mirror 222 and export, one
Divide and be reflected back intracavitary progress resonance, basic mode is converted into after very few mould long-period fiber grating 241, using doping with rare-earth ions
Optical fiber 213 is amplified, and is transferred in 221 return cavity of total reflection mirror, is formed complete laser resonance.By adjusting Polarization Control
Device 231, it is possible to realize column vector beam TM01And TE01Tunable, the high efficiency output of pattern.
The innovation of the utility model is：Few mould long-period fiber grating is introduced, Mode Coupling is used as in laser cavity
Element using its height mode coupling efficiency, the characteristics of low insertion loss, realizes the high efficiency output of column vector laser beam.
Although the utility model and its advantage is described in detail, it is to be understood that, without departing substantially from by appended right
It is required that in the case of the spirit and scope of the utility model limited, various change, replacement and transformation can be carried out.In addition, not
Mean that the scope of the utility model is limited to technique, equipment, manufacture and material composition, means, method described in specification
With the specific embodiment of step.Those skilled in the art will readily recognize that those now from the disclosure of the utility model
Technique, equipment, manufacture, material composition, means, method or step existing or be later discovered that, with basis described herein
The utility model accordingly implements the substantially the same function of used completion or reaches substantially the same result.Therefore, the phase
Appended claim is hoped to include such technique, equipment, manufacture, material composition, means, method or step in their model
In enclosing.
Claims (3)
1. a kind of high efficiency all -fiber column vector beam laser, it is characterised in that：Including amplifier module, pattern modulus of conversion
Block, Polarization Control Module, resonant tank module, wherein：
The amplifier module can be that pumping source, wavelength division multiplexer and gain media are formed, and the pumping source swashs for semiconductor
Optical diode is connected with the reflection end of wavelength division multiplexer, and the gain media being connected to the common end with wavelength division multiplexer is inputted and connected
Continuous laser, for providing, laser generates and amplification, generated laser are basic mode；The gain media is doping with rare-earth ions
Optical fiber；Optical fiber used in the amplifier module is all single mode optical fiber, and single mode optical fiber only supports basic mode to transmit；The amplifier mould
Total reflection mirror and mode conversion module in the block with resonator mode are connected respectively at block both ends；
The mode conversion module can be few mould long-period fiber grating, respectively with amplifier module resonant cavity module
In partially reflecting mirror be connected；Few mould long-period fiber grating refers to inscribe long-period gratings on less fundamental mode optical fibre,
When meeting resonance condition, the conversion from basic mode to single order pattern can be realized in resonance wave strong point, due to making few mould long period
Typically uni-directional inscription during fiber grating has polarization dependent behavior, and the inclined of incident basic mode light beam is adjusted by Polarization Control Module
The excitation of the polarization state property of may be selected by radially and angularly polarizes, and mode conversion efficiency is high, and insertion loss is small；Few mould light
Fibre is not only can support basic mode that can also support the optical fiber of single order pattern；
The Polarization Control Module can be Polarization Controller, be added in amplifier module and few mould long-period fiber grating
Between, for adjusting the polarization state for the basic mode light being incident in few mould long-period fiber grating, realize selectively with tunable
Excite single order pattern；The single order pattern includes radially and angularly polarised light i.e. TM01And TE01Pattern；
The resonant tank module can be made of a total reflection mirror and partially reflecting mirror；The total reflection mirror and part is anti-
It can be wide range reflection or narrow spectrum reflection to penetrate mirror, and implementation method can be profile of optic fibre plated film, plug lattice nanogram ring, optical fiber light
Grid；The partially reflecting mirror is as output cavity mirror.
2. high efficiency all -fiber column vector beam laser according to claim 1, it is characterised in that：By amplifier module
It generates basic mode laser and amplifies, basic mode laser changes polarization state by Polarization Controller, is again incident on few mould long period optical fiber light
Grid near resonant wavelength, expeditiously and selectively inspire single order pattern, that is, radially and angularly polarization mode；
Radially and angularly polarization mode reaches partially reflecting mirror, some output a, part is reflected back intracavitary, grows week using few mould
Phase fiber grating is coupled back into basic mode, and basic mode continues to amplify by amplifier module, then is reflected back intracavitary through total reflection mirror and has realized
Whole laser operation；It, can be with since few mould long-period fiber grating has the characteristic of height mode transfer efficiency and low insertion loss
Realize the efficient selectivity output of angular and radial polarization pattern.
3. high efficiency all -fiber column vector beam laser according to claim 1, it is characterised in that：In total reflection mirror and
Laser cavity between few mould long-period fiber grating is basic mode operating, few mould long-period fiber grating and part total reflection mirror it
Between laser cavity be radially and angularly polarization mode operating.
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| CN201721719797.6U CN207559263U (en) | 2017-12-12 | 2017-12-12 | A kind of high efficiency all -fiber column vector beam laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107872002A (en) * | 2017-12-12 | 2018-04-03 | 中国科学技术大学 | A kind of high efficiency all -fiber column vector beam laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107872002A (en) * | 2017-12-12 | 2018-04-03 | 中国科学技术大学 | A kind of high efficiency all -fiber column vector beam laser |
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