CN208797348U - A kind of random-distribution feedback optical fiber laser generating column vector beam - Google Patents
A kind of random-distribution feedback optical fiber laser generating column vector beam Download PDFInfo
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- CN208797348U CN208797348U CN201821516058.1U CN201821516058U CN208797348U CN 208797348 U CN208797348 U CN 208797348U CN 201821516058 U CN201821516058 U CN 201821516058U CN 208797348 U CN208797348 U CN 208797348U
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Abstract
The utility model discloses a kind of random-distribution feedback optical fiber lasers for generating column vector beam, and due to the presence that random distribution is fed back in laser, the column vector beam of output has the characteristic of Low coherence.The laser mainly includes high reflection mirror, mode output module, amplifier module and random distribution feedback module.The utility model provides random distribution using fiber loop and feeds back, and model selection coupler realizes the output of column vector beam.The utility model structure is simple, and integrated level is high, low in cost, is applicable to the special dimension of Low coherence column vector laser light source.
Description
Technical field
The utility model relates to optical fiber laser field more particularly to a kind of random distribution feedbacks for generating column vector beam
Optical fiber laser.
Background technique
Column vector beam is the non-uniform beam of light that axial symmetry distribution is presented in beam cross-section for a kind of polarization, wherein most generation
Table is exactly radial polarized light beam and angular polarization light beam.Because under the conditions of their symmetrical polarisation distributions and strong-focusing
The reflected peculiar property of institute, column vector beam are all opened up in fields such as high-resolution imaging, communication, material processing, optical acquisitions
Unique application value is revealed.Optical fiber laser has many advantages, such as that integrated level is high, at low cost, generates column in conjunction with optical fiber laser
Vector beam is obtaining extensive report these years.But the light of traditional fiber laser output has high coherence, this
The application of column vector beam is limited to a certain extent.
Random-distribution feedback optical fiber laser also obtains extensive research in recent years.In this laser, laser
The feedback of device is provided by the back-scattering light in optical fiber, and the laser exported has lower coherence.Optical fiber random laser device
Because having many advantages, such as that low cost, low technical threshold and special output characteristics lead them in communication, sensing, imaging etc.
Domain suffers from potential application value.
Up to now, still without the report in relation to realizing column vector beam output in random distribution optical fiber laser.
It is believed that some excellent characteristics using random-distribution feedback optical fiber laser centainly can greatly expand answering for column vector beam
With.
Utility model content
The purpose of the utility model is to overcome the deficiencies described in background technique, propose a kind of generation column vector light
The random-distribution feedback optical fiber laser of beam has the characteristics that output laser coherence is low, threshold value is low, structure is simple, at low cost.
The technical scheme in the invention for solving the technical problem are as follows:
A kind of random-distribution feedback optical fiber laser generating column vector beam, due to random distribution feedback in laser
In the presence of the column vector beam of output has the characteristic of Low coherence.The laser mainly include high reflection mirror, mode output module,
Amplifier module and random distribution feedback module.The utility model provides random distribution using fiber loop and feeds back, mode
Coupler is selected to realize the output of column vector beam.The utility model structure is simple, and integrated level is high, low in cost, is suitable for needing
Want the special dimension of Low coherence column vector laser light source.
It is a kind of generate column vector beam random-distribution feedback optical fiber laser, including high reflection mirror, mode output module,
Amplifier module and random distribution feedback module, in which:
The high reflection mirror can be optical fiber loop reflecting mirror, fiber bragg grating, vertically cut and plate metal film
Fiber end face；
The mode output module exports for realizing the selectivity of mould field, it is by Polarization Controller and model selection coupling
Clutch composition；The model selection coupler is by a single mode optical fiber and a less fundamental mode optical fibre in such a way that fused biconical taper is wound
It is made, wherein single mode optical fiber only supports basic mode to transmit, and less fundamental mode optical fibre also supports the biography of single order higher order mode other than basic mode
It is defeated；The energy between mould field will be occurred since two fiber cores are within close proximity for coupled zone by drawing the region of cone winding in coupled zone
Amount exchange, the energy of the basic mode transmitted in single mode optical fiber can be partly coupled in less fundamental mode optical fibre single order higher order mode up, from
And the output of single order higher order mode is obtained in less fundamental mode optical fibre port, and the basic mode not being coupled then can be in the other end of single mode optical fiber
Output, it is thus achieved that basic mode and single order higher order mode are exported in the selectivity of different port；The Polarization Controller is placed
In less fundamental mode optical fibre output port, for adjusting output polarization state, to obtain tunable single order higher order mode output；Described one
Rank higher order mode includes TM01And TE01Mode corresponds respectively to radially and angularly polarised light；
The amplification module can be constituted for pumping source, wavelength division multiplexer and gain media, and the pumping source is semiconductor
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, for providing laser generation and amplification；The gain media is doping with rare-earth ions optical fiber；
The random distribution feedback module, for can be fiber loop to intracavitary offer random distribution feedback, wherein
A port be connected to fibre optic isolater or optical fiber tail-end has done inclined cut processing.
Wherein, two singlemode fiber ports of the model selection coupler in mode output module respectively with high reflection mirror and
Amplifier module is connected.
Wherein, random distribution feedback module is connected with amplifier module, and amplifier module generates basic mode laser and amplifies, and infuses
Enter in fiber loop, light transmits counterclockwise in ring, while generating back-scattering light in the clockwise direction.Backwards
Scattering light will partially be coupled back into it is intracavitary serve as feedback, be amplified again by amplifier module, by mode output module, part
Basic mode is converted into single order higher order mode and exports in one of less fundamental mode optical fibre port of model selection coupler, the base not being converted
Mould light is reflected back intracavitary by high reflection mirror, realizes complete laser operation.
Wherein, in addition to two few mould output ports of model selection coupler use less fundamental mode optical fibre, laser each section
Optical fiber used in element is all single mode.
The beneficial effects of the utility model are mainly manifested in:
The utility model introduces four ends using the backscattering in fiber loop as a feedback of laser
The model selection coupler of mouth, realizes output of the column vector beam in random-distribution feedback optical fiber laser.Designed
Laser structure is simple, and integrated level is high, low in cost, is suitable for large-scale commercial production.In addition, compared to column is reported before
Vector optical fiber laser, the column vector beam of output also have the characteristics that Low coherence, the column vector light of this novel Low coherence
There is unique advantage in source in terms of reducing laser speckle and atmospheric turbulance scintillation effect, is expected to be applied to bio-imaging, laser
The application fields such as radar and space optical communication.
Detailed description of the invention
Attached drawing used in the embodiment 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 skilled in the art, without creative efforts, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the random-distribution feedback optical fiber laser module map of the generation column vector beam of the utility model.
Fig. 2 is the random-distribution feedback optical fiber laser structure chart of the generation column vector beam of the utility model.
Appended drawing reference meaning in figure are as follows: 11 be amplification module, and 12 be random distribution feedback module, and 13 export mould for mode
Block, 14 be high reflection mirror, and 211 be pumping source, and 212 be wavelength division multiplexer, and 213 be doping with rare-earth ions optical fiber, and 221 is humorous for optical fiber
Shake ring, and 222 be inclined cut end face, and 231 be model selection coupler, and 232 be Polarization Controller, and 241 be total reflection mirror.
Specific embodiment
As shown in Figure 1, a kind of random-distribution feedback optical fiber laser for generating column vector beam, including amplification module 11,
Random distribution feedback module 12, mode output module 13, high reflection mirror 14.Wherein amplification module 11 is for generating basic mode light and putting
Greatly；Random distribution feedback module 12 and high reflection mirror 14 constitute laser resonator and realize laser resonance；Mode output module 13 is logical
It overregulates output polarization state and realizes column vector beam TM01And TE01The selectivity of mode exports.
Referring to implementation example figure, the embodiments of the present invention is described in detail.
As shown in Fig. 2, pumping source 211 can be coupled to laser by wavelength division multiplexer 212 for semiconductor laser diode
It is intracavitary, it is injected on doping with rare-earth ions optical fiber 213 and generates basic mode light and amplify.The basic mode light of amplification is injected into fiber loop
It 221 and is transmitted in the counterclockwise direction in ring, part light will be coupled in fiber loop right end and be exported, and the tail end of right end optical fiber be done
Inclined cut processing is to guarantee that it is intracavitary that end face reflection light does not return to.Wherein, inclined cut end face 222 can be by Fiber isolation
Device replaces.Back-scattering light can transmit along clockwise direction in fiber loop, and part is coupled back into intracavitary composition laser
One feedback, i.e., random distribution feed back.Two singlemode fiber ports of model selection coupler 231 respectively with wavelength division multiplexer
212 are connected with total reflection mirror 241.Total reflection mirror 241 is made of the fiber end face for vertically cutting and plating metal silverskin, can be with
It is replaced by fiber bragg grating or optical fiber loop reflecting mirror.Meeting when back-scattering light passes through doping with rare-earth ions optical fiber 213
Amplified again, when by model selection coupler 231, the basic mode light transmitted in single mode optical fiber will be partially converted into single order high-order
Mode is exported from less fundamental mode optical fibre port, adjusts output polarization state by adjusting the Polarization Controller 232 being placed on less fundamental mode optical fibre, just
Column vector beam TM may be implemented01And TE01The selectivity of mode exports.The basic mode light not being converted is reflected through total reflection mirror 241
Return it is intracavitary, constitute complete laser resonance.
The innovation of the utility model is: anti-using one of the backscattering composition laser in fiber loop
Feedback selects coupler in conjunction with four port modes, realizes output of the column vector beam in random-distribution feedback optical fiber laser.
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 various change, replacement and transformation can be carried out in the case where the spirit and scope of the utility model limited.In addition, not
Mean that the scope of the utility model is limited to technique, equipment described in specification, manufacture and material composition, means, method
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
Hope the attached claims by the model that such technique, equipment, manufacture, material composition, means, method or step include at them
In enclosing.
Claims (4)
1. a kind of random-distribution feedback optical fiber laser for generating column vector beam, it is characterised in that: including high reflection mirror, mode
Output module, amplifier module and random distribution feedback module, in which:
The high reflection mirror can be optical fiber loop reflecting mirror, fiber bragg grating, the light for vertically cutting and plating metal film
Fine end face；
The mode output module exports for realizing the selectivity of mould field, it is by Polarization Controller and model selection coupler
Composition；Model selection coupler system in such a way that fused biconical taper is wound by a single mode optical fiber and a less fundamental mode optical fibre
, wherein single mode optical fiber only supports basic mode to transmit, and less fundamental mode optical fibre also supports the transmission of single order higher order mode other than basic mode；
The energy between mould field will be occurred since two fiber cores are within close proximity for coupled zone by drawing the region of cone winding in coupled zone
Exchange, the energy of the basic mode transmitted in single mode optical fiber can be partly coupled in less fundamental mode optical fibre single order higher order mode up, thus
Less fundamental mode optical fibre port obtain single order higher order mode output, and the basic mode not being coupled then can single mode optical fiber the other end it is defeated
Out, it is thus achieved that basic mode and single order higher order mode are exported in the selectivity of different port；The Polarization Controller, is placed in
Less fundamental mode optical fibre output port, for adjusting output polarization state, to obtain tunable single order higher order mode output；The single order
Higher order mode includes TM01And TE01Mode corresponds respectively to radially and angularly polarised light；
The amplifier module can be constituted for pumping source, wavelength division multiplexer and gain media, and the pumping source swashs for semiconductor
Optical diode is connected with the reflection end of wavelength division multiplexer, and the gain media input being connected to the common end with wavelength division multiplexer
Continuous laser, for providing laser generation and amplification；The gain media is doping with rare-earth ions optical fiber；
The random distribution feedback module, for can be fiber loop to intracavitary offers random distribution feedback, therein one
A port is connected to fibre optic isolater or optical fiber tail-end has done inclined cut processing.
2. the random-distribution feedback optical fiber laser according to claim 1 for generating column vector beam, it is characterised in that: mould
Two singlemode fiber ports of the model selection coupler in formula output module are connected with high reflection mirror and amplifier module respectively.
3. the random-distribution feedback optical fiber laser according to claim 1 for generating column vector beam, it is characterised in that: with
Machine distributed feed-back module is connected with amplifier module, and amplifier module generates basic mode laser and amplifies, in injection fibre resonant ring,
Light transmits counterclockwise in ring, while generating back-scattering light in the clockwise direction；Back-scattering light is by part coupling
Close back it is intracavitary serve as feedback, by being amplified again when amplifier module, by mode output module, part basic mode is converted into one
Rank higher order mode is exported in one of less fundamental mode optical fibre port of model selection coupler, and the basic mode light not being converted is through excessively high anti-
It penetrates mirror and is reflected back intracavitary, realize complete laser operation.
4. the random-distribution feedback optical fiber laser according to claim 1 for generating column vector beam, it is characterised in that: remove
The few mould output ports of the two of model selection coupler use less fundamental mode optical fibre, optical fiber used in laser each section element
It is all single mode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963742A (en) * | 2018-09-17 | 2018-12-07 | 中国科学技术大学 | A kind of random-distribution feedback optical fiber laser generating column vector beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963742A (en) * | 2018-09-17 | 2018-12-07 | 中国科学技术大学 | A kind of random-distribution feedback optical fiber laser generating column vector beam |
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