CN107181162A - A kind of fiber laser frequency multiplier part - Google Patents
A kind of fiber laser frequency multiplier part Download PDFInfo
- Publication number
- CN107181162A CN107181162A CN201710512867.9A CN201710512867A CN107181162A CN 107181162 A CN107181162 A CN 107181162A CN 201710512867 A CN201710512867 A CN 201710512867A CN 107181162 A CN107181162 A CN 107181162A
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- Prior art keywords
- frequency
- laser
- light
- optical fiber
- polarization
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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
-
- 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
- H01S3/10061—Polarization control
-
- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
Abstract
The present invention discloses a kind of fiber laser frequency multiplier part, the fundamental frequency light of optical fiber output is carried out being collimated into parallel light output including optical fiber collimator, the fundamental frequency light of polarization state random distribution is separated into the two beam directions of propagation into 90 degree and the mutually perpendicular two bunch polarised light in polarization direction by polarization spectroscope, the reflected mirror of linearly polarized light realizes the deflection of the direction of propagation, two bunch polarised lights realize that secondary frequency multiplication obtains double-frequency laser output through frequency-doubling crystal, two beam double-frequency lasers are overlapped by polarization beam combiner, the fibre core output through optical fiber collimator coupled into optical fibres.The present invention is split using the polarization spectroscope fundamental frequency light unrelated to polarization and distinguishes frequency multiplication, effectively improves the shg efficiency of optical fiber laser；The optical fiber output that double-frequency laser is realized in shaping is carried out to the light beam of fundamental frequency light and frequency doubled light using optical fiber collimator, can have the advantages that shg efficiency height, stability are good, easily operated as independent fiber laser frequency multiplier part.
Description
Technical field
The application belongs to laser technology field, specifically, is related to a kind of fiber laser frequency multiplier part.
Background technology
The advantages of optical fiber laser is with its small volume, high electro-optical efficiency, good beam quality, leads in industrial laserses application
Domain is quickly grown, and what is be widely used at present has the continuous or pulse of tri- kinds of optical maser wavelength output of 1064nm, 1550nm, 2000nm
The optical fiber laser of form.But in laser application, different application material is different to the absorption characteristic of optical maser wavelength, and optical fiber swashs
Light device output wavelength limits its further application.In order to expand the output wavelength scope of optical fiber laser, frequently with non-thread
Property the fundamental frequency light that is exported to optical fiber laser of frequency-doubling crystal carry out the double-frequency laser output that low wavelength is realized in second harmonic effect.
The application spy of visible light wave range laser output is obtained using nonlinear frequency transformation technology in all solid state laser
It is unripe, particularly all-solid state laser intracavity frequency doubling technology, but the volume of solid state laser is big, electro-optical efficiency is low, stably
The poor, maintenance cost of property is high.In order to expand the scope of laser output wavelength, the double-frequency laser that nonlinear crystal frequency-doubled effect is produced is defeated
The research gone out receives much concern.For example：Patent " the high-power green-light fiber laser of 540nm all optical fibre structures（Publication No.
CN201210222630.4）" middle by the way of intracavity frequency doubling that the frequency-doubling crystal with collimation focusing function is individual with unification
540nm total reflection fiber gratings build the green glow output that frequency doubling cavity realizes 540nm in 1064nm resonator.The system is to obtain
Obtain high-power green glow output and require that all optical fiber is polarization maintaining optical fibre, high is required to device welding, complete machine high expensive.Specially
A kind of sharp " green-light fiber laser（Publication No. CN201110302554.3）" by the way of cavity external frequency multiplication, use lens group
The fundamental frequency light that optical fiber laser is exported is focused on Brewster piece, and Brewster piece transmitted light progress secondary frequency multiplication is realized green
There is the problem of shg efficiency is low in light output, the system, produce high power frequency multiplication light output relatively difficult.
The content of the invention
In view of this, technical problems to be solved in this application there is provided a kind of fiber laser frequency multiplier part, by setting
Optical fiber collimator, polarization spectroscope beam splitting are put, frequency-doubling crystal and polarization beam combiner close beam, improve basic frequency laser shg efficiency,
Realize that double-frequency laser tail optical fiber is exported.
In order to solve the above-mentioned technical problem, this application discloses a kind of fiber laser frequency multiplier part, it includes：Fiber optic collimator
Device, optical fiber collimator carries out collimation output to the basic frequency laser of optical fiber output；Polarization spectroscope, polarization spectroscope is by basic frequency laser
The two beam directions of propagation are separated into an angle of 90 degrees and mutually perpendicular first linearly polarized light of polarization state and the second linearly polarized light；Wherein,
First linearly polarized light forms the double-frequency laser of second harmonic after frequency-doubling crystal, and double-frequency laser is realized through the first speculum and propagated
The deflection of light path enters polarization beam combiner；Second linearly polarized light enters frequency-doubling crystal after the second speculum realizes optical path-deflecting
Form double-frequency laser and enter polarization beam combiner；Two beam double-frequency lasers are overlapped by polarization beam combiner, are coupled into a branch of frequency doubled light
Into optical fiber collimator.Frequency doubled light after optical fiber collimator pairing beam is focused, and frequency doubled light coupled into optical fibres fibre core is realized
Optical fiber output.
According to an embodiment of the present invention, wherein above-mentioned optical fiber collimator is had by the passive fiber end welding of undoped
GRIN Lens is realized.
According to an embodiment of the present invention, wherein above-mentioned polarization spectroscope is that one kind is alternate between two right-angle prisms
Plate high index of refraction and low refractive index film layer material, and glued block prism.
According to an embodiment of the present invention, wherein above-mentioned frequency-doubling crystal is the optical crystal with nonlinear interaction.
According to an embodiment of the present invention, wherein above-mentioned first speculum is coated with the projection of basic frequency laser height and double-frequency laser
The film layer of total reflection, the second speculum is totally reflected film layer to be coated with basic frequency laser.
According to an embodiment of the present invention, wherein above-mentioned first speculum and the second speculum are placed into pre- controlling angle,
For deflecting Laser Transmission direction, pre- controlling angle is 45 degree.
According to an embodiment of the present invention, wherein above-mentioned polarization beam combiner is identical with polarization spectroscope structure, polarization point
Light microscopic is split to basic frequency laser, and the double-frequency laser that polarization beam combiner is formed to the first linearly polarized light with the second linearly polarized light enters
Row closes beam.
According to an embodiment of the present invention, wherein using two optical fiber collimators, fundamental frequency light output time fibre collimater
Collimation output is carried out to fundamental frequency light, frequency multiplication light output time fibre collimater is focused coupled into optical fibres fibre core to frequency doubled light, real
Existing double-frequency laser optical fiber output.
Compared with prior art, the application can be obtained including following technique effect：
1）The fundamental frequency light of polarization state random distribution is separated into by the mutually perpendicular polarization of two beam polarization states using polarization spectroscope
Light, two beam polarised lights are respectively adopted frequency-doubling crystal and carry out secondary frequency multiplication, improve the utilization rate of fundamental frequency fundamental frequency light, effectively improve laser
Shg efficiency.
2）Two beam double-frequency lasers are superimposed output using polarization beam combiner, the output work of double-frequency laser is effectively improved
Rate.
3）Optical fiber collimator is used as online laser frequency multiplier, the input of fundamental frequency light is realized, the output of frequency doubled light is made
It is easy to use for independent frequency doubling device.
Certainly, implementing any product of the application must be not necessarily required to while reaching all the above technique effect.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please is used to explain the application, does not constitute the improper restriction to the application.In the accompanying drawings：
Fig. 1 is the light path schematic diagram of the fiber laser frequency multiplier part of an embodiment of the present invention；
Fig. 2 is the optical fiber collimator structure schematic diagram of an embodiment of the present invention；
Fig. 3 is the polarization spectroscope operation principle schematic diagram of an embodiment of the present invention.
Reference
Optical fiber collimator 10, polarization spectroscope 20, frequency-doubling crystal 30, the first speculum 40, the second speculum 50, polarization beam combiner
60, optical fiber collimator 70, optical fiber 11, GRIN Lens 12, basic frequency laser A, the first linearly polarized light a1, the second linearly polarized light a2,
Frequency doubled light B, prefabricated angle, θ, incident light M, transmitted light m1, reflected light m2.
Embodiment
Describe presently filed embodiment in detail below in conjunction with drawings and Examples, thereby how the application is applied
Technological means can fully understand and implement according to this to solve technical problem and reach the implementation process of technology effect.
Fig. 1 to Fig. 3 is refer to, Fig. 1 is the light path schematic diagram of the fiber laser frequency multiplier part of an embodiment of the present invention；Figure
2 be the optical fiber collimator structure schematic diagram of an embodiment of the present invention；Fig. 3 is the polarization spectroscope work of an embodiment of the present invention
Make principle schematic.A kind of fiber laser frequency multiplier part is collimated including optical fiber collimator 10 to the fundamental frequency light A of optical fiber output
Parallel light output is formed, the fundamental frequency light A of direction of vibration random distribution is separated into two beam direction of propagation angles by polarization spectroscope 20
Into an angle of 90 degrees and orthogonal first linearly polarized light a1 and the second linearly polarized light a2；Wherein, the first linear polarization a1 light is by again
The speculum 40 of frequency crystal 30 and first enters polarization beam combiner 60；Second linearly polarized light a2 is brilliant by the second speculum 50 and frequency multiplication
Body 30 enters polarization beam combiner 60；Polarization beam combiner 60 by be superimposed the first linearly polarized light a1 and the second linearly polarized light a2 into frequency multiplication
Light B；Frequency doubled light B is focused on through optical fiber collimator 70 and is coupled to optical fiber output.
Optical fiber collimator 10 has GRIN Lens 12 by the end welding of core diameter 10um, 20um, 25um passive fiber 11
It is made.It is worth mentioning that the making of optical fiber collimator 70 and optical fiber collimator 10 are identical, difference is that optical fiber is accurate
The finishing of optical fiber output is formed directional light output by straight device 10, and optical fiber collimator 70 is by the fibre core of parallel light focusing to optical fiber
In, realize frequency doubled light B optical fiber output.
As shown in figure 3, the operation principle schematic diagram of polarization spectroscope 20 of an embodiment of the present invention.As illustrated, polarization
Spectroscope 20 alternately plates high index of refraction and the film layer 21 of low-refraction to be a kind of between two right-angle glass prisms, and glued
One piece of block prism, efficient splitting ratio can be obtained by the design of film layer and the number of plies.Incident light M is perpendicular to prism
Surface, multilayer dielectricity film layer 21 is incided with 45 degree of angles, after reflecting and transmit through film layer 21, and reflected light m2 and transmitted light m1 are vertical
In prism surface with separately 90 degree of direction outgoing.The reflected light m2 and transmitted light m1 of outgoing are that two beam direction of vibration are mutually perpendicular
Linearly polarized light.
In an embodiment of the present invention, frequency-doubling crystal 30 is lithium triborate crystal LBO, BBO Crystal BBO, phosphoric acid
Titanyl potassium crystal KDP or potassium dihydrogen phosphate crystal KTP nonlinear crystal.Nonlinear crystal translucency is good, damage from laser fault
Value is high.First linearly polarized light a1 and the second linearly polarized light a2 is carried out second harmonic effect by frequency-doubling crystal 30, can turn fundamental frequency light A
Change frequency doubled light B into.
In Fig. 1, the first speculum 24 and the second speculum 25 are all with Laser Transmission direction into predetermined angle theta, predetermined angle theta
For 45 degree.The first speculum 40 is coated with the eyeglass of frequency doubled light B total reflection fundamental frequency light A height projection film layers simultaneously, realizes that First Line is inclined
The deflection for the frequency doubled light B transmission directions that the light of the light a1 that shakes outputs is formed through frequency-doubling crystal 30, the second speculum 50 is coated with fundamental frequency light A
The eyeglass of film layer is totally reflected, horizontal deflection is entered to the fundamental frequency light A direction of propagation.Two beam frequency doubled lights are real under the effect of polarization beam combiner 60
Now close beam output.Fundamental frequency light B is coupled in the fibre core of optical fiber by the self-focusing effect of optical fiber collimator 70 realizes optical fiber output.
It is noted that the polarization beam combiner 60 of the present invention is identical with the structure of polarization spectroscope 20, polarization spectroscope 20
Basic frequency laser A is split, polarization beam combiner 60 couple of first linearly polarized light a1 and the second linearly polarized light a2 carry out conjunction beam, more in detail
For thin, i.e., polarization beam combiner 60 is realized the conjunction beam of the two bunch polarised lights acted on by frequency-doubling crystal 30 and is superimposed, and obtains height
The double-frequency laser B of efficiency, improves frequency doubled light B power output.
The operation principle of the present invention：The basic frequency laser that the present invention is exported free polarization state using polarization spectroscope 20 is separated
It is in an angle of 90 degrees and the mutually perpendicular two bunch polarised light of direction of vibration into the two beam directions of propagation, two bunch polarised lights are respectively by again
The second harmonic effect of frequency crystal 30 produces frequency doubled light B, improves basic frequency laser A utilization rate.Finally use polarization beam combiner
Two beam frequency doubled light B are coupled into a branch of light output by 60, improve frequency doubled light B power output.The present invention uses optical fiber collimator 70
Frequency doubled light B is focused on to the fibre core for being coupled to optical fiber, the optical fiber output of double-frequency laser is realized, the present invention is used as independent laser freuqency doubling
Device, is conducive to the application of frequency doubled light.
Some preferred embodiments of the application have shown and described in described above, but as previously described, it should be understood that the application
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations,
Modification and environment, and above-mentioned teaching or the technology or knowledge of association area can be passed through in application contemplated scope described herein
It is modified., then all should be in this Shen and the change and change that those skilled in the art are carried out do not depart from spirit and scope
Please be in the protection domain of appended claims.
Claims (8)
1. a kind of fiber laser frequency multiplier part, it is characterised in that including：
Optical fiber collimator, the optical fiber collimator carries out collimation output to the basic frequency laser of optical fiber output；
The basic frequency laser is separated into the two beam directions of propagation into an angle of 90 degrees and polarization state by polarization spectroscope, the polarization spectroscope
Mutually perpendicular first linearly polarized light and the second linearly polarized light；
Wherein, first linearly polarized light forms the double-frequency laser of second harmonic, the double-frequency laser warp after frequency-doubling crystal
First speculum realizes that the deflection for propagating light path enters polarization beam combiner；Second linearly polarized light is realized by the second speculum
Enter frequency-doubling crystal formation double-frequency laser after optical path-deflecting and enter the polarization beam combiner；
Two beam double-frequency lasers are overlapped by the polarization beam combiner, are coupled into a branch of frequency doubled light and are entered optical fiber collimator；
Frequency doubled light after the optical fiber collimator pairing beam is focused, and frequency doubled light coupled into optical fibres fibre core is realized into optical fiber is defeated
Go out.
2. fiber laser frequency multiplier part according to claim 1, it is characterised in that wherein described optical fiber collimator is mixed by non-
Miscellaneous passive fiber end welding has GRIN Lens realization.
3. fiber laser frequency multiplier part according to claim 1, it is characterised in that wherein described polarization spectroscope is one kind
It is alternate between two right-angle prisms to plate high index of refraction and low refractive index film layer material, and glued block prism.
4. fiber laser frequency multiplier part according to claim 1, it is characterised in that wherein described frequency-doubling crystal is with non-
The optical crystal of linear action.
5. fiber laser frequency multiplier part according to claim 1, it is characterised in that wherein described first speculum is coated with base
The projection of frequency laser height and the film layer of double-frequency laser total reflection, second speculum are totally reflected film layer to be coated with basic frequency laser.
6. fiber laser frequency multiplier part according to claim 5, it is characterised in that wherein described first speculum with it is described
Second speculum is placed into pre- controlling angle, and for deflecting Laser Transmission direction, pre- controlling angle is 45 degree.
7. fiber laser frequency multiplier part according to claim 3, it is characterised in that wherein described polarization beam combiner with it is described
Polarization spectroscope structure is identical, and the polarization spectroscope is split to the basic frequency laser, and the polarization beam combiner is to described
First linearly polarized light and the double-frequency laser of second linearly polarized light formation carry out conjunction beam.
8. fiber laser frequency multiplier part according to claim 2, it is characterised in that wherein using two optical fiber collimators,
Fundamental frequency light output time fibre collimater carries out collimation output to fundamental frequency light, and frequency multiplication light output time fibre collimater is carried out to frequency doubled light
Coupled into optical fibres fibre core is focused on, double-frequency laser optical fiber output is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710512867.9A CN107181162A (en) | 2017-06-29 | 2017-06-29 | A kind of fiber laser frequency multiplier part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710512867.9A CN107181162A (en) | 2017-06-29 | 2017-06-29 | A kind of fiber laser frequency multiplier part |
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| Publication Number | Publication Date |
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| CN107181162A true CN107181162A (en) | 2017-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710512867.9A Withdrawn CN107181162A (en) | 2017-06-29 | 2017-06-29 | A kind of fiber laser frequency multiplier part |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108723587A (en) * | 2018-07-06 | 2018-11-02 | 温州大学激光与光电智能制造研究院 | Laser freuqency doubling switching device and its method |
| CN111077117A (en) * | 2019-11-14 | 2020-04-28 | 中国科学院福建物质结构研究所 | Surface second-order nonlinear optical testing device and testing method |
| CN111664786A (en) * | 2020-05-13 | 2020-09-15 | 上海机电工程研究所 | Optical isolation device and method suitable for dual-frequency laser interferometry |
-
2017
- 2017-06-29 CN CN201710512867.9A patent/CN107181162A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108723587A (en) * | 2018-07-06 | 2018-11-02 | 温州大学激光与光电智能制造研究院 | Laser freuqency doubling switching device and its method |
| CN111077117A (en) * | 2019-11-14 | 2020-04-28 | 中国科学院福建物质结构研究所 | Surface second-order nonlinear optical testing device and testing method |
| CN111664786A (en) * | 2020-05-13 | 2020-09-15 | 上海机电工程研究所 | Optical isolation device and method suitable for dual-frequency laser interferometry |
| CN111664786B (en) * | 2020-05-13 | 2022-05-27 | 上海机电工程研究所 | Optical isolation device and method suitable for dual-frequency laser interferometry |
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Application publication date: 20170919 |