CN109038196A - A kind of device directly generating narrow linewidth vortex laser - Google Patents
A kind of device directly generating narrow linewidth vortex laser Download PDFInfo
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- CN109038196A CN109038196A CN201810817898.XA CN201810817898A CN109038196A CN 109038196 A CN109038196 A CN 109038196A CN 201810817898 A CN201810817898 A CN 201810817898A CN 109038196 A CN109038196 A CN 109038196A
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
-
- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
-
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/163—Solid materials characterised by a crystal matrix
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of devices for directly generating vortex beams, belong to optical technical field, which includes: monolithic laser chamber, for generating population inversion to provide the gain of light, while as nonplanar optical ring resonant cavity；Magnetic field applies module, provides necessary condition across the magnetic field of laser cavity for generating to generate Faraday effect unidirectionally to go out light；Pumping laser module, is coupled in laser cavity for focusing on, and gain media is made to generate population inversion, while the vortex resonant laser light mode of the offset optimization excitation cavity by light-beam position；Lens module is respectively used to be focused pumping laser and collimate to vortex laser.The pumping laser that the present invention uses gaussian model to be distributed is directly realized by the continuous laser that spectral line width reaches 1kHz magnitude by selectively exciting the swirl pattern in the non-planar chamber of monolithic.
Description
Technical field
The invention belongs to optical technical fields, more particularly, to a kind of device for directly generating narrow linewidth vortex laser.
Background technique
Vortex beams have peculiar phase distribution structure, and Scrawl point is presented on the section vertical with the direction of propagation
Cloth, and the annular beam for having central scotoma is usually shown in light distribution.Compared with common Gaussian beam, in addition to phase
Outside feature on position and light distribution, vortex beams are also equipped with special orbital angular momentum.Currently, the type light beam is wide
It is general to be applied in the technologies such as submicroscopic imaging, light manipulation, the optic communication of high capacity, quantum information science and nonlinear optics.Especially
In terms of optic communication, the orbital angular momentum of vortex light is by as information carrier, for effectively improving in space or optical fiber
Signal path realizes the laser communication system of high capacity.And the vortex light for having narrow linewidth characteristic can be further improved laser
Coherence, be advantageously implemented the laser communication of high bandwidth.
The production method of vortex beams includes using optical conversion component and direct intracavitary generation two ways.Optical transition
Element has spiral phase plate, calculates holographic plate, spatial light modulator, cylindrical lens ad-hoc mode bridgeware, which also can be used
Inside the laser resonator for generating vortex light.And another method for directly generating vortex laser, then using annular optical pumping
Laser cavity, in laser cavity added holes defective element, utilize photo-thermal effect and off-axis pump mode.And the vortex of narrow linewidth swashs
Light then proposes additional requirement to vortex beams production method.For example, the laser beam itself based on optical conversion component must
Must have narrow linewidth characteristic.
Summary of the invention
In view of the drawbacks of the prior art, present invention aim to address the technologies for directly generating single mode narrow linewidth vortex laser
Problem, overcome the shortcomings of it is existing based on multiple optical components generate narrow linewidth vortex beams system complexity, propose a kind of energy
Enough to have high stability and simple and compact property while the device for generating narrow-linewidth single frequency vortex laser, which is also equipped with operation
Simply, the high feature of stability.
The present invention provides a kind of devices for directly generating narrow linewidth vortex laser, comprising: monolithic laser chamber, magnetic field apply
Module, pumping laser module and lens module, the monolithic laser chamber uses rear-earth-doped crystal as gain media, for producing
Raw zlasing mode；The magnetic field applies module for generating the constant magnetic parallel with the cavity plane of the monolithic laser chamber
, and be applied to and the zlasing mode of different directions is made to generate damage on the monolithic laser chamber in a manner of faraday's magnetic rotation
It is poor to consume, and unidirectionally goes out condition necessary to light to provide；The pumping laser module is for emitting described in pumping laser and excitation
The population inversion of rare earth ion generates the light amplification needed for laser generates in gain media, to realize vortex Laser emission；Institute
Lens module is stated to export for realizing the focusing coupling to pumping laser and to the collimation of vortex laser.
Further, the pumping laser of pumping laser module transmitting off-axis after lens module focuses coupling is incident to institute
It states on monolithic laser chamber, and is absorbed by the gain media and generate population inversion.
Further, monolithic laser chamber includes: three not parallel total reflection boundary faces and a laser wavelength height
Reflection and pumping wave band disappears anti-coated surface.
Wherein, first is formed after carrying out first time total reflection when laser beam is incident on the edge surface of monolithic laser chamber
Reflected light, the first reflected light form the second reflected light, the second reflected light shape after being totally reflected for the third time after being totally reflected for the second time
At third reflected light, third is reflected light back at the plane of incidence, and since plated film generates, high reflection is overlapped with laser beam and phase is full
Sufficient condition of resonance generates zlasing mode.
Further, laser beam and the third reflected light are generally aligned in the same plane, and first reflected light and institute
The second reflected light is stated to be located in the plane different from the laser beam.
Wherein, the laser beam after lens module focuses coupling is incident on other in the intracavitary light path of monolithic laser
Incident angle when three non-coated surfaces is more than or equal to critical angle when laser beam generates total reflection from medium to air.
As an embodiment of the present invention, incident angle range is 30 °~45 °.
The auxiliary optical component that the existing mode for generating vortex laser needs to convert using icotype, and can be in transit chamber
The technology laser linewidth obtained of continuous vortex laser is directly generated generally more than MHz magnitude.The present invention is contemplated to be swashed
The major advantage that light device device has compared with prior art: (1) laser cavity and gain media are that the high-quality laser of monolithic is brilliant
Body, and without using additional auxiliary optical component；(2) vortex laser caused by is single-frequency continuous laser, and line width can reach
1kHz magnitude.Therefore, apparatus of the present invention can have structure it is simple, small in size and light-weight while, generate have high phase
The continuous vortex laser of stemness has preferable potential application in the fields such as laser metrology and optic communication.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of narrow linewidth vortex laser aid provided in an embodiment of the present invention.
Fig. 2 is the pump mode schematic diagram of excitation vortex optical mode provided in an embodiment of the present invention.
Fig. 3 is the principle schematic illustration that the intracavitary vortex optical mode of monolithic laser is formed.
Fig. 4 is plot of light intensity (left side) and fork-shaped interference pattern (right side) that the present invention generates+1 rank narrow linewidth vortex laser.
Fig. 5 is plot of light intensity (left side) and fork-shaped interference pattern (right side) that the present invention generates -1 rank narrow linewidth vortex laser.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The producing method of existing narrow linewidth vortex laser is usually required that be used on the basis of existing narrow-linewidth laser light source
Additional optical conversion component, because without having simplification.The present invention is directed to this technical problem, proposes do not using any volume
The device of narrow linewidth vortex laser is generated on the basis of outer optical conversion component directly in one chip laser cavity.The device has
Simple and compact feature can directly inspire the vortex laser of narrow linewidth using common pumping laser.
The invention discloses one kind directly to generate narrow-linewidth single frequency vortex laser in the non-planar annular laser cavity of one chip
The device of light beam.The had spectral line width of vortex laser that the device generates, therefore can generally within the scope of 1kHz-10kHz
For in the application such as accurate measurement and coherent light communication.
Narrow-linewidth single frequency vortex light generating device provided by the invention includes: monolithic laser chamber, magnetic field application module, pumping
Laser module and lens module, wherein rear-earth-doped crystal can be used as gain media in monolithic laser chamber, while with non-planar
The generation of the zlasing mode of the structural support high-quality-factor (i.e. low-loss) of ring resonator；Magnetic field, which applies module, can be used
The modes such as permanent magnet or hot-wire coil go to generate constant magnetic field, and swashing for different directions is made in a manner of faraday's magnetic rotation
Optical mode generates loss difference, unidirectionally goes out condition necessary to light to provide；Pumping laser module is for exciting in gain media
The population inversion of rare earth ion generates the light amplification needed for laser generates, to realize vortex Laser emission；Lens module is used for
Focusing coupling to pumping laser and the collimation output to vortex laser.
Monolithic laser chamber includes: the laser cavity of monolithic, can be and is had by raman material, rare earth doped material and semiconductor etc.
There is the gain media of Verdet constant to prepare.The cavity is directly processed on material, to generate nonplanar laser resonance
Structure is generally disappeared anti-coated surface by three not parallel total reflection boundary faces and a laser wavelength high reflection, pumping wave band
It is formed.
Magnetic field applies module for generating stationary magnetic field, and direction is parallel with plane where emergent light with cavity incidence, mesh
When being using magnetic rotation effect light to be propagated in the medium generate optical vibration direction deflection so that clockwise
Loss difference is generated with ring type resonant mode counterclockwise, to guarantee that the one way stable of laser cavity goes out light；Its structure specifically can be with
Are as follows: monolithic or two panels permanent magnet are used, so that magnetic direction is parallel with cavity plane；Or phase is generated using Helmholtz coil
Equidirectional magnetic field.
Pumping laser module can be exported using free space or the semiconductor diode of fiber coupling output or solid
Body laser, output wavelength should be consistent with pump light source needed for laser levels transition.
Lens module includes: to focus coupled lens 2 and collimation output lens module 4, focuses coupled lens 2 and is used for pumping
The pumping laser that laser module 1 generates exports after focusing；Output lens module 4 is collimated to be used for unidirectional laser light clockwise
Beam 7 exports after being collimated.
The present invention uses the laser cavity of common pumping laser focal pumping monolithic nonplanar ring cavity structure, by inclined
The mode that axis is adjusted selectively excites the vortex optical mode of high-quality laser cavity, to realize the direct of single-frequency vortex laser
It generates.
For the further description device provided in an embodiment of the present invention for directly generating vortex beams, now in conjunction with attached drawing
And details are as follows for specific example:
As shown in Figure 1, the device for directly generating vortex beams includes: monolithic laser chamber 3, magnetic field applies module, pumping swashs
Optical module 1 focuses coupled lens 2 and collimation output lens module 4, focuses coupled lens 2 and going out for pumping laser module 1 is arranged in
It penetrates in optical path and the emergent light for focusing coupled lens 2 is incident to the plane of incidence of monolithic laser chamber 3, the incident light is by being repeatedly all-trans
The light being emitted after penetrating exports after collimation output lens module 4 collimates.
As shown in Fig. 2, the incident light in the present invention is incident on monolithic laser chamber 3 by off-axis, in incident coated surface 301
Upper formation pump spot 601；When guaranteeing that the incident angle of incident light meets cavity resonant mode angle requirement, schemed by mobile
The position of pump beam 6, lens 2 or cavity 3 in 1 moves on to annular so that pump spot 601 deviates the center of coated surface 301
In hot spot 705.By taking size 8mm × 10mm × 3mm cavity as an example, off-centered distance is substantially in 30 μm of -200 μ m
It is interior.Detailed step is as follows:
Firstly, the pumping laser light beam 6 that space exports is focused on the incidence of monolithic laser cavity 3 by lens 2 by we
On coated surface 301.By calculating the cross section spot size of optical mode in monolithic laser chamber 3, focal pumping light hot spot is designed
601 diameter, the pattern match for making it equal to or being slightly less than calculated value to have reached.
Secondly, coupling pump light will be absorbed into laser cavity 3 by gain material generates population inversion.The pump light enters
Firing angle degree need to be adjusted to the design angle for meeting monolithic nonplanar ring cavity, i.e. laser beam is incident in an intracavitary light path
When other three non-coated surfaces, angle meets the condition that light generates the cirtical angle of total reflection from medium to air that is more than or equal to.It is logical
Often, this angular range can be 30 °~45 °.At this point, zlasing mode generates resonance in cavity, the characteristics of mode, is: generating
Laser beam 701 be incident on laser cavity 3 edge surface carry out first time total reflection after form the first reflected light 702, first
Reflected light 702 carries out second forming the second reflected light 703 after being totally reflected, and the second reflected light 703 is after third time is totally reflected
Third reflected light 704 is formed, third reflected light 704 returns at the plane of incidence, since plated film generates high reflection and 701 weight of laser beam
It closes and phase meets condition of resonance and generates zlasing mode.
Wherein, laser beam 701 and third reflected light 704 are generally aligned in the same plane, and the first reflected light 702 and the second reflection
Light 703 is located in the plane different from laser beam 701 each other.Make the vibration side of intracavity beam by applying stationary magnetic field 5
To Faraday magneto-optical rotation is generated, to generate the outgoing of unidirectional laser beam 7 clockwise.
In embodiments of the present invention, three angles can not be identical, but is all usually design symmetry, that is to say, that such as
The incidence angle phase of laser beam 701 to the first reflected light 702 and the second reflected light 703 to third reflected light 704 shown in FIG. 1
Together, the incidence angle of 702 to the second reflected light 703 of the first reflected light is generally different from other incidence angles.
The implementation of off-axis pump mode, the center that pump spot 601 can be first optimized to face 301 then pass through adjusting
The position (i.e. position of the tuningout hot spot 601 on face 301) of pump beam 6, lens 2 or cavity 3, and detect output facula
Interference figure is to determine output that vortex light arrives.Based on the method for conventional interference method survey vortex light, generally works as and observe
When fork-shaped, vortex or petal interference figure, it may be determined that the generation of vortex laser.Fig. 4 and Fig. 5 opens up for what we experimentally obtained
Flutter the vortex laser output figure that lotus number is ± 1.Wherein, left figure is the light beam light distribution measured on imaging device, and right figure is then
Pass through the fork-shaped interference pattern with the relevant generation of hither plane wave.By interference pattern it can be concluded that the topological charge number of vortex light.Finally, passing through
Collimation output is carried out to unidirectional laser beam 7 using collimation output lens module 4.
The principle schematic illustration that monolithic laser chamber mesoscale eddies light generates is as shown in Figure 3.Typical vortex Laguerre-Gauss
LG01Mould can be seen that as two kinds of high-order Hermite-Gaussian optical mode HG01Superposition.For nonplanar annular housing, HG01Mould
In communication process, due to non-planar reflection hot spot rotation occurs for formula, can then regard different HG as01What mode was formed by stacking
LG01 swirl pattern produces in the annular housing of the type.Therefore, by by pump light hot spot off-axis to the mode have compared with
When at good space coincidence, vortex zlasing mode can be excited out.
Since the non-planar ring resonator of the monolithic used in the present invention just can support height without additional auxiliary element
The vortex optical mode of quality, therefore the present invention can be further reduced unnecessary additional auxiliary element, have smaller volume and
More stable advantage.Meanwhile by the high anti-plated film of laser wavelength in 301 faces, in conjunction in the type monolithic laser chamber optical loop
The total reflection used, which can have the i.e. preferable quality factor of lower loop loss, therefore be produced based on the present invention
Raw single-frequency vortex laser linewidth can reach 1kHz magnitude.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of device for directly generating narrow linewidth vortex laser characterized by comprising monolithic laser chamber, magnetic field apply mould
Block, pumping laser module and lens module,
The monolithic laser chamber uses rear-earth-doped crystal as gain media, for generating zlasing mode；
The magnetic field applies module for generating the constant magnetic field parallel with the cavity plane of the monolithic laser chamber, and applies
The zlasing mode of different directions is made to generate loss difference in a manner of faraday's magnetic rotation on the monolithic laser chamber, thus
It provides and unidirectionally goes out condition necessary to light；
The pumping laser module is used to emit pumping laser and excites the population inversion of rare earth ion in the gain media
The light amplification needed for laser generates is generated, to realize vortex Laser emission；
The lens module exports for realizing the focusing coupling to pumping laser and to the collimation of vortex laser.
2. device as described in claim 1, which is characterized in that the pumping laser of pumping laser module transmitting is poly- through lens module
Off-axis is incident on the monolithic laser chamber after coke coupling, and is absorbed by the gain media and generated population inversion.
3. device as claimed in claim 1 or 2, which is characterized in that the monolithic laser chamber includes: three and not parallel is all-trans
It penetrates boundary face and a laser wavelength high reflection and pumping wave band disappears anti-coated surface.
4. device as claimed in claim 3, which is characterized in that when laser beam is incident on the edge surface of monolithic laser chamber
The first reflected light is formed after carrying out first time total reflection, the first reflected light forms the second reflected light after being totally reflected for the second time, the
Two reflected lights form third reflected light after being totally reflected for the third time, and third reflects light back at the plane of incidence, since plated film generates height
Reflection is overlapped with laser beam and phase meets condition of resonance and generates vortex zlasing mode.
5. device as claimed in claim 4, which is characterized in that the laser beam and the third reflected light are located at same put down
Face, and first reflected light and second reflected light are located in the plane different from the laser beam.
6. such as the described in any item devices of claim 3-5, which is characterized in that the laser beam after lens module focuses coupling
Incident angle when being incident on other three non-coated surfaces in the intracavitary light path of monolithic laser be more than or equal to laser beam from
Critical angle when medium generates total reflection to air.
7. device as claimed in claim 6, which is characterized in that the incident angle range is 30 °~45 °.
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| CN201810817898.XA CN109038196B (en) | 2018-07-20 | 2018-07-20 | A kind of device directly generating narrow linewidth vortex laser |
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| CN201810817898.XA CN109038196B (en) | 2018-07-20 | 2018-07-20 | A kind of device directly generating narrow linewidth vortex laser |
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Cited By (3)
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|---|---|---|---|---|
| CN111200233A (en) * | 2020-01-15 | 2020-05-26 | 厦门大学 | Narrow linewidth frequency multiplication vortex optical laser |
| CN111628398A (en) * | 2020-04-08 | 2020-09-04 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Device for generating low-noise double-frequency laser and photo-generated microwave |
| CN115579719A (en) * | 2022-09-29 | 2023-01-06 | 北京理工大学 | Single-frequency vortex laser |
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| CN115579719A (en) * | 2022-09-29 | 2023-01-06 | 北京理工大学 | Single-frequency vortex laser |
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| CN109038196B (en) | 2019-07-05 |
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