CN103513428A - Method and device for achieving coherent laser beam combination - Google Patents
Method and device for achieving coherent laser beam combination Download PDFInfo
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- CN103513428A CN103513428A CN201310467671.4A CN201310467671A CN103513428A CN 103513428 A CN103513428 A CN 103513428A CN 201310467671 A CN201310467671 A CN 201310467671A CN 103513428 A CN103513428 A CN 103513428A
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Abstract
The invention discloses a method for achieving coherent laser beam combination, and belongs to the technical field of lasers. The method includes the steps of dividing signal light emitted by a laser device into multiple routes of laser beams, leading out one of the multiple routes of laser beams as current reference light, enabling the rest of the multiple routes of laser beams to be coupled with corresponding blue light beams respectively, conducting amplification on the coupled beams, and outputting the beams in a collimation mode after the beams undergo light modulation to obtain a coherent laser beam. The light modulation is achieved through the step of modulating blue light in each route of light beams into laser phase positions. The power of the current blue light beam which is coupled with the laser beam depends on the phase position difference between previous reference light and the corresponding route of light beam which is outputted in the collimation mode after the light modulation is conducted. Meanwhile, the invention further provides a device corresponding to the method. The method is easy and convenient to achieve, the device is easy and convenient to obtain, accurate phase position modulation can be achieved without specific requirements for the thermal bearing capacity of devices, high-power coherent laser output is achieved, and the method and device can be widely applied to the laser technology.
Description
Technical field
The invention belongs to laser technology field, particularly a kind ofly realize method and the device that bundle is closed in laser wave-front coherence.
Background technology
The application of having relatively high expectations in laser power, owing to being subject to the impact of the mechanism such as the thermal effect of laser instrument own or nonlinear effect, the output power of laser instrument can be limited, reach required higher laser output power, swash combiner technology and be wherein a kind of technical solution, to meet the requirement of system to high power laser light output.
In swashing the technical scheme of combiner, two kinds of conventional bundle modes of closing are: incoherent bundle and the relevant bundle that closes of closing, and wherein the incoherent bundle that closes is simple each road laser energy stack, therefore can not realize optimum chemical combination bundle; And relevant He Shushige road laser interferes, be the stack of input laser electric field, to compare, its performance is more excellent.
Relevant closing, on bundle, there are two important influence factors: accurate phase control and fill factor, curve factor.At present, relevant, close in the implementation of bundle, in order to ensure accurate phase control, conventionally high to the demand of the hot ability to bear of corresponding device, for example adopt the mode of grating external-cavity combination to realize the relevant bundle that closes, concrete structure can be with reference to figure 1, in this scheme, body grating is placed in Compound Cavity, all laser instruments (provide in figure be exemplified as pumping source fuel laser instrument) share 1 exocoel, by 1 translucent coupling mirror, realize output, lens focus makes different laser beams incide on special body grating with different angles, and only in one direction coherence stack jointly export, because having certain reflectivity, outgoing mirror provides feedback, the energy of different light beams can be entered in other optical fiber, the light generation of each fiber laser checks and balance like this, reach phase-locked object.But in this programme, due to special body grating in one direction coherence stack jointly to export ，Qi perform region smaller, cause body grating to require hot holding capacity higher, so can not reach the more relevant bundle that closes of multiple beam.Therefore be necessary to propose a kind of new relevant bundle processing scheme of closing, reduce the demand to the hot ability to bear of corresponding device, to improve existing relevant efficiency of closing bundle scheme.
Summary of the invention
The object of the invention is to: provide a kind of efficient, to the hot ability to bear demand of equipment low realize method and the device that laser coherence closes bundle.
Of the present inventionly realize the method that laser coherence closes bundle, comprise the following steps:
The flashlight that laser instrument is sent is divided into multi-path laser light beam, and wherein a road laser beam is drawn as current reference light, and all the other each road laser beams are coupled with corresponding blue light light beam respectively;
Coupling Hou Ge road light beam is amplified to processing ，Zai Duige road light beam and carry out after optical modulation is processed collimating output, obtain being concerned with and close bundle;
Described optical modulation is treated to: the blue light in the light beam of Jiang Ge road is modulated to the phase place of laser; The power of the current blue light light beam of described and laser beam coupling, depend on last reference light and optical modulation process after phase differential between the light beam of the respective optical path exported of collimation.
The present invention is based on the phase differential between the current laser beam obtaining and coupled light beam (coupled light beam of laser beam and blue light light beam), characteristic relation with blue power, the regulated quantity of the blue light light beam power while obtaining next coupling processing, the power of the blue light light beam of subsequent coupling being processed based on the current power adjustments amount of obtaining is controlled, so realize phase-locked output, obtain laser wave-front coherence and close bundle output.It realizes easy, realizes the relevant light beam that closes bundle many, and the efficiency of the coherent laser output obtaining is high, and can guarantee phase-modulation degree of accuracy, again can be not high to the hot ability to bear demand of device.
Based on method of the present invention, the invention also discloses a kind of device that laser coherence closes bundle of realizing, comprising:
The beam splitter of external laser instrument, described beam splitter is connected with detector, for Jiang Yi road Laser beam propagation to detector;
A plurality of coupling mechanisms that are connected with beam splitter, blu-ray drive respectively, for the light beam of coupling beam divider and blu-ray drive output;
With the amplifier that described coupling mechanism is connected, described amplifier is connected one to one with coupling mechanism;
The photomodulator being connected with each amplifier, for being modulated to the blue light of the output beam of each amplifier the phase place of laser;
And the collimating mirror that the output beam of photomodulator is collimated and exported, the output beam of collimation mirror carries out the semi-transparent semi-reflecting lens of transmission and reflection, and the reflected light that described semi-transparent semi-reflecting lens produces enters detector;
The laser beam of described detector based on beam splitter transmission, phase differential between exploring laser light light beam and catoptrical each road light beam, and convert described phase differential to blu-ray drive that electric signal exports respective optical path to, for controlling the power of the blue light light beam of its output.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows: relevant phase control of closing bundle is accurate, relevant to close bundle treatment effeciency high, and it is convenient to realize.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the relevant device schematic diagram that closes bundle of existing realization;
Fig. 2 is the fundamental diagram of the specific embodiment of the invention;
1-n---represent the laser beam of different light paths, 2-n---represent the blue light light beam of different light paths, wherein n is natural number; 3---collimating mirror; 4---semi-permeable and semi-reflecting mirror; 5---detector.
Embodiment
Disclosed all features in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.That is,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.
Referring to Fig. 2, the present invention realizes the device that laser coherence closes bundle, comprises beam splitter, coupling mechanism, and amplifier, blu-ray drive, photomodulator, collimating mirror 3, semi-transparent semi-reflecting lens 4, detector 5,
Wherein, beam splitter is by the laser instrument (as seed source laser) of the external light that transmits of Transmission Fibers, and this flashlight is the laser that will close bundle; And beam splitter is also connected with detector 5, for Jiang Yi road Laser beam propagation, to detector 5, the laser beam of input detector is as with reference to light;
Blu-ray drive, is the blue laser that can control blue power, for exporting the blue light light beam of different luminous powers;
Coupling mechanism, is specially monomode coupler, and based on Transmission Fibers, coupling mechanism is connected with beam splitter, blu-ray drive respectively, and for the light beam of coupling beam divider and blu-ray drive output, the number of coupling mechanism depends on the relevant involved light beam of bundle that closes of needs;
Amplifier, in present embodiment, selects MOPA power amplifier, and it is the master oscillator power amplifier fiber array carrying out for flashlight.Amplifier is connected with each coupling mechanism one by one by Transmission Fibers;
The photomodulator being connected with each amplifier by Transmission Fibers, in present embodiment, select blue optical-address liquid crystal spatial light modulator, it is by the voltage swing at the intensity control liquid crystal two ends of blue light, realize light addressing, thereby reach the modulation to the flashlight phase place of input, respectively the blue light in the light beam of the output of amplifier is modulated to the phase place of laser;
And the collimating mirror 3 that the output beam of photomodulator is collimated and exported, its focal length is arranged and is selected according to the geometry of optical fiber, and LCD space light modulator is in the focus of collimating mirror;
The output beam of collimation mirror 3 carries out the semi-transparent semi-reflecting lens 4 of transmission and reflection, and the reflected light that semi-transparent semi-reflecting lens 4 produces enters in detector 5.Because 4 pairs of flashlight transmissivities of semi-transparent semi-reflecting lens are very high, reflectivity is lower, thereby make it small part reflected light, enters in detector 5, with reference light generation difference interference, utilizes process of heterodyning, obtains the phase pushing figure of system, for close-loop feedback, controls phase information is provided;
Detector 5 is connected by Transmission Fibers with blu-ray drive, each phase pushing figure that it is obtained exports corresponding blu-ray drive to, for controlling the power of its output blue light light beam, after phase pushing figure is to be coupled based on 2-n road blue light light beam (n is greater than 0 natural number) and laser beam, when the light beam of photomodulator, collimating mirror 3, semi-transparent semi-reflecting lens 4 reflections, this side-play amount is transferred to the blu-ray drive of output 2-n road blue light light beam.
Workflow of the present invention is: seed source laser is launched flashlight, and flashlight is divided into multi-path laser light beam through beam splitter, and wherein a pass goes out as with reference to light and transfer to detector 5, all the other light path called after light path 1-1,1-2 ..., 2-n; Blu-ray drive is to control blue light light beam power, export different luminous powers (during system initialization, blue light light beam power can arrange arbitrarily initial value, when subsequent treatment, the power of blue light light beam, depends on the phase differential between the light beam that collimates the respective optical path of exporting after last reference light and optical modulation are processed.) blue light light beam be 2-1,2-2 ..., 2-n; Each road laser beam, blue light light beam transfer to respectively coupling mechanism, and the laser beam of two different wave lengths, blue light light beam are coupled to a road light beam by coupling mechanism, be transferred to amplifier realize the amplification to light beam through Transmission Fibers; Light beam after amplification arrives photomodulator through Transmission Fibers, by photomodulator, the phase information of the coaxial blue light light beam transmitting is modulated to the phase information of laser beam.Because the watt level of blue light light beam is that the phase information of obtaining according to close-loop feedback is calculated gained, therefore can make each road flashlight output there is identical phase place, there is identical wavefront, complete laser wave-front coherence and close bundle.The output beam of photomodulator is through collimating mirror 3 output that collimates, its output beam reflects sub-fraction light to detector 5 through semi-transparent semi-reflecting lens 4, reflected light is interfered with the reference light of drawing, through detector 5, survey its phase differential (utilizing process of heterodyning to obtain the phase pushing figure of each road light beam and reference light), characteristic relation through phase differential and blue power, obtain the regulated quantity of blue power, this regulated quantity converts electric signal to, control blu-ray drive, realize the control of blue light luminous power, so reach phase-locked output, obtain laser wave-front coherence and close bundle output.
Embodiment
In this exemplifying embodiment, seed source laser output signal light 1064nm infrared light, through beam splitter, be divided into multi-path laser light beam, the light of reading as LCD space light modulator, blu-ray drive is controlled output multi-channel 450nm blue light, as the control light of LCD space light modulator, writes light inlet, and corresponding light beam is coupled in Transmission Fibers and transmits through coupling mechanism, each road light beam is realized and is amplified output by MOPA power amplifier, then is transferred to LCD space light modulator surface through Transmission Fibers.LCD space light modulator, to output light phase modulation, is modulated into the output before same wave, and then realizes the relevant bundle that closes of wavefront.
The present embodiment is by utilizing technology relatively ripe, the LCD space light modulator of relative low price, realizes the relative precise phase of laser is controlled, and makes the modulated signals laser array through LCD space light modulator output, there is identical wavefront, thereby complete laser wave-front coherence, close bundle.Compare with existing scheme, it realizes easy, with low cost, low to the hot ability to bear demand of device, and the relevant power that closes bundle output is high.
Claims (6)
1. realize the method that laser coherence closes bundle, it is characterized in that, comprise the following steps:
The flashlight that laser instrument is sent is divided into multi-path laser light beam, and wherein a road laser beam is drawn as current reference light, and all the other each road laser beams are coupled with corresponding blue light light beam respectively;
Coupling Hou Ge road light beam is amplified to processing ，Zai Duige road light beam and carry out after optical modulation is processed collimating output, obtain being concerned with and close bundle;
Described optical modulation is treated to: the blue light in the light beam of Jiang Ge road is modulated to the phase place of laser;
The power of the current blue light light beam of described and laser beam coupling, depend on last reference light and optical modulation process after phase differential between the light beam of the respective optical path exported of collimation.
2. the method for claim 1, it is characterized in that, the phase differential obtaining between reference light and the light beam of respective optical path is: after optical modulation is processed, the light path of collimation output, through semi-transparent semi-reflecting lens, is carried out difference interference by the reflected light obtaining and reference light, obtains corresponding phase differential.
3. method as claimed in claim 1 or 2, is characterized in that, when execution laser beam blue light light beam carries out coupling operation, the power of each blue light light beam of initialization is preset value.
4. realize the device that laser coherence closes bundle, it is characterized in that, comprising:
The beam splitter of external laser instrument, described beam splitter is connected with detector, for Jiang Yi road Laser beam propagation to detector;
A plurality of coupling mechanisms that are connected with beam splitter, blu-ray drive respectively, for the light beam of coupling beam divider and blu-ray drive output;
With the amplifier that described coupling mechanism is connected, described amplifier is connected one to one with coupling mechanism;
The photomodulator being connected with each amplifier, for being modulated to the blue light of the output beam of each amplifier the phase place of laser;
And the collimating mirror that the output beam of photomodulator is collimated and exported, the semi-transparent semi-reflecting lens that the output beam of collimation mirror projects and reflects, the reflected light that described semi-transparent semi-reflecting lens produces enters detector;
The laser beam of described detector based on beam splitter transmission, the phase differential between exploring laser light light beam and catoptrical each road light beam, and described phase differential is exported to the blu-ray drive of respective optical path, for controlling the power of the blue light light beam of its output.
5. device as claimed in claim 3, is characterized in that, described photomodulator is blue optical-address liquid crystal spatial light modulator.
6. the device as described in claim 3 or 4, is characterized in that, described amplifier is Master Oscillator Power-Amplifier.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107561649A (en) * | 2017-10-10 | 2018-01-09 | 长春长光博迅光电科技有限公司 | Light wavelength-multiplexing systems based on LCD space light modulator |
| CN108780010A (en) * | 2016-01-18 | 2018-11-09 | 通快科研激光两合公司 | Relative phase for optics coherence tomography laser beam measures |
| CN112164973A (en) * | 2020-10-12 | 2021-01-01 | 中国人民解放军国防科技大学 | Phase control system and method for realizing orbital angular momentum light beam mode switching |
| CN115039017A (en) * | 2020-01-31 | 2022-09-09 | 通快激光有限责任公司 | Device, laser system and method for combining coherent laser beams |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108780010A (en) * | 2016-01-18 | 2018-11-09 | 通快科研激光两合公司 | Relative phase for optics coherence tomography laser beam measures |
| US11114814B2 (en) | 2016-01-18 | 2021-09-07 | Trumpf Scientific Lasers Gmbh + Co. Kg | Relative phase measurement for coherent combining of laser beams |
| CN107561649A (en) * | 2017-10-10 | 2018-01-09 | 长春长光博迅光电科技有限公司 | Light wavelength-multiplexing systems based on LCD space light modulator |
| CN115039017A (en) * | 2020-01-31 | 2022-09-09 | 通快激光有限责任公司 | Device, laser system and method for combining coherent laser beams |
| CN112164973A (en) * | 2020-10-12 | 2021-01-01 | 中国人民解放军国防科技大学 | Phase control system and method for realizing orbital angular momentum light beam mode switching |
| CN112164973B (en) * | 2020-10-12 | 2021-08-27 | 中国人民解放军国防科技大学 | Phase control system and method for realizing orbital angular momentum light beam mode switching |
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