CN103762486A - Fiber laser for outputting incoherent laser beam - Google Patents
Fiber laser for outputting incoherent laser beam Download PDFInfo
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- CN103762486A CN103762486A CN201410038170.9A CN201410038170A CN103762486A CN 103762486 A CN103762486 A CN 103762486A CN 201410038170 A CN201410038170 A CN 201410038170A CN 103762486 A CN103762486 A CN 103762486A
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- 239000000835 fiber Substances 0.000 title claims abstract description 75
- 239000013307 optical fiber Substances 0.000 claims description 104
- 230000001427 coherent effect Effects 0.000 claims description 22
- 230000001360 synchronised effect Effects 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 abstract description 2
- 230000010287 polarization Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a fiber laser for outputting an incoherent laser beam. The fiber laser comprises a continuous laser signal source (1), an isolator (2), an amplitude modulator (3), a phase modulator (4), a first fiber bundling device (5), a pump light source (6), a second fiber bundling device (7), a doped fiber amplifier (8), a delay fiber (9), an acousto-optical switch (10), a synchronizing signal generator (11) and a detector (12). Compared with the prior art, the fiber laser has the advantages of being simple in structure, good in stability, high in laser beam quality and low in complete machine cost, meanwhile, having the capacity for shaping pulse time waveforms at will and the like.
Description
Technical field
The present invention relates to a kind of fiber laser, especially relate to a kind of fiber laser of exporting non-coherent bundle.
Background technology
The coherence length of laser is very long, and the feature of coherent light is that the phase place of its all light wave is all synchronous, and whole Shu Guang just looks like one " wave train ".But at aspects such as detecting techniques, use relevant laser radar to require quite harsh to narrow linewidth pulsed laser technique and optical alignment.Use the laser radar of incoherent (direct detection) formula but than coherent laser, to have more advantages.And the mode that produces now incoherent laser is to use multiple laser beams to be combined into, researcher has done a large amount of research work at optical-fiber laser incoherent bundle prescription face both at home and abroad, successively proposed multiple beam combination scheme, be summed up and be mainly divided into exocoel bundle group, PTR Bragg grating beam combination and adaptive optical element beam combination three major types.And these three kinds of beam combinations have a shortcoming, need exactly multiple lasers, in the situation that producing multiple incoherent laser, just need multiple lasers to close bundle, its cost is very high.And each laser can not accomplish that the error that identical, more laser produces is just larger, cause beam combination array element number to be restricted.
Summary of the invention
Object of the present invention be exactly in order to overcome the defect that above-mentioned prior art exists, provide that a kind of simple in structure, good stability, beam quality are high, the ability simultaneously with burst length waveform any reshaping and the fiber laser of the lower-cost output non-coherent bundle of complete machine.
Object of the present invention can be achieved through the following technical solutions:
A kind of fiber laser of exporting non-coherent bundle, it is characterized in that, comprise continuous laser signal source, isolator, amplitude modulaor, phase-modulator, the first optical-fiber bundling device, pump light source, the second optical-fiber bundling device, doped optical fibre amplifier, delay optical fiber, acoustooptic switch, synchronous generator and detector;
The input of described continuous laser signal source, isolator, amplitude modulaor, phase-modulator, the first optical-fiber bundling device connects successively, output, the pump light source of the first described optical-fiber bundling device are connected with the pumping end of the second optical-fiber bundling device respectively, described the second optical-fiber bundling device output, doped optical fibre amplifier, delay optical fiber, acoustooptic switch are connected successively with detector, described detector is connected with the input of the first optical-fiber bundling device, and described synchronous generator is connected with amplitude modulaor, phase-modulator and acoustooptic switch respectively.
Described the first optical-fiber bundling device, the second optical-fiber bundling device, doped optical fibre amplifier, delay optical fiber, acoustooptic switch detector and the first optical-fiber bundling device is connected rear formation fiber annular system successively, this fiber annular system is by again closing bundle the pulse signal sending by amplitude modulaor in time, pulse signal has eliminated coherence after fiber annular system, closes the output that realizes incoherent laser beam after bundle.
Described delay optical fiber is that length exceedes the delay optical fiber of Output of laser coherence length (coherence length is defined as l=λ herein
2/ Δ λ).
The continuous signal that described amplitude modulaor sends continuous laser signal source is carried out Modulation and Amplitude Modulation, realizes the laser pulse output of random waveform.
The second described optical-fiber bundling device is pump combiner, and the flashlight of the first optical-fiber bundling device output and the pump light being sent by pump light source are coupled in doped optical fibre amplifier jointly, and doped optical fibre amplifier is input to the laser after amplifying to postpone in optical fiber.
Described acoustooptic switch judges that whether the laser pulse stack number postponing in optical fiber reaches set point, if yes, opens acoustooptic switch, by incoherent Laser output.
Described acoustooptic switch capable of regulating switch closing time, the circulation number of turns of the fiber annular system of control impuls and pulse overlap number.
Described doped optical fibre amplifier is used for making up the loss in fiber annular system, energy while making pulsed light get back to the first optical-fiber bundling device through a circle is identical with original signal luminous energy value, allow finally to close the energy value of intrafascicular every part of flashlight identical, the shared ratio of every part of flashlight is identical, to realize the output of incoherent laser beam.
The switching sequence of described synchronous generator control amplitude modulaor, phase-modulator and acoustooptic switch.
Compared with prior art, the present invention has a pulse laser is repeatedly utilized, and greatly reduces cost, simplify the structure, be conducive to improve beam quality and the stability of Laser output, only apply a pulse signal, the impact of the individual error weakening on instrument.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention:
Fig. 2 is the switching sequence of three devices of synchronizing signal control of the present invention.
Wherein 1 is that continuous laser signal source, 2 is that isolator, 3 is that amplitude modulaor, 4 is that phase-modulator, 5 is that the first optical-fiber bundling device, 6 is that pump light source, 7 is that the second optical-fiber bundling device, 8 is that doped optical fibre amplifier, 9 is that delay optical fiber, 10 is that acoustooptic switch, 11 is that synchronous generator and 12 is detector
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, export a fiber laser for non-coherent bundle, comprise continuous laser signal source 1, isolator 2, amplitude modulaor 3, phase-modulator 4, the first optical-fiber bundling device 5, pump light source 6, the second optical-fiber bundling device 7, doped optical fibre amplifier 8, postpone optical fiber 9, acoustooptic switch 10, synchronous generator 11 and detector 12;
Described continuous laser signal source 1, isolator 2, amplitude modulaor 3, phase-modulator 4, the input of the first optical-fiber bundling device 5 connects successively, the output of the first described optical-fiber bundling device 5, pump light source 6 is connected with the pumping end of the second optical-fiber bundling device 7 respectively, the second described optical-fiber bundling device 7 outputs, doped optical fibre amplifier 8, postpone optical fiber 9, acoustooptic switch 10 is connected successively with detector 12, described detector 12 is connected with the input of the first optical-fiber bundling device 5, described synchronous generator 11 respectively with amplitude modulaor 3, phase-modulator 4 is connected with acoustooptic switch 10.
After being connected successively, described the first optical-fiber bundling device 5, the second optical-fiber bundling device 7, doped optical fibre amplifier 8, delay optical fiber 9, acoustooptic switch 10 detectors 12 and the first optical-fiber bundling device 5 form fiber annular system, this fiber annular system is by again closing bundle the pulse signal sending by amplitude modulaor in time, pulse signal has eliminated coherence after fiber annular system, closes the output that realizes incoherent laser beam after bundle.Fiber annular system plays the effect of a fiber amplifier and optical fiber delay, make up on the one hand laser in long Distance Transmission and through the loss in various optics, make on the other hand the transmission of pulse exceed device coherence length, be non-coherent addition when stack.
Described delay optical fiber 9 exceedes the delay optical fiber of Output of laser coherence length for length.The continuous signal that described amplitude modulaor 3 sends continuous laser signal source 1 is carried out Modulation and Amplitude Modulation, realizes the laser pulse output of random waveform.The second described optical-fiber bundling device 7 is pump combiner, the flashlight that the first optical-fiber bundling device 5 is exported and the pump light being sent by pump light source 6 are coupled in doped optical fibre amplifier 8 jointly, and doped optical fibre amplifier 8 is input to the laser after amplifying to postpone in optical fiber 9.
Described acoustooptic switch 10 judges that whether the laser pulse stack number postponing in optical fiber 9 reaches set point, if yes, opens acoustooptic switch 10, by incoherent Laser output.Described acoustooptic switch 10 capable of regulating switch closing times, the circulation number of turns of the fiber annular system of control impuls and pulse overlap number.
Described doped optical fibre amplifier 8 is used for making up the loss in fiber annular system, energy while making pulsed light get back to the first optical-fiber bundling device 5 through a circle is identical with original signal luminous energy value, allow finally to close the energy value of intrafascicular every part of flashlight identical, the shared ratio of every part of flashlight is identical, to realize the output of incoherent laser beam.
Described synchronous generator 11 is controlled the switching sequence of amplitude modulaor 3, phase-modulator 4 and acoustooptic switch 10.
Continuous laser signal source 1 is exported continuous wave signal, and through isolator 2, isolator is protected continuous laser signal source 1, prevents interference and the damage to continuous laser signal source 1 of reverberation by follow-up fiber optic loop.The laser of being exported by isolator is through amplitude modulaor 3 and phase-modulator 4, and amplitude modulaor 3 and phase-modulator 4 are driven through overdrive circuit by Arbitrary Waveform Generator, can be by laser beam through copped wave, shaping and phase-modulation.After phase-modulator 4, continuous laser originally becomes pulse laser, and has adjustable impulse waveform, intensity and random PHASE DISTRIBUTION arbitrarily.Then, through the first optical-fiber bundling device 5, be injected in fiber optic loop.In fiber optic loop, the pump light that the second optical-fiber bundling device 7 provides by flashlight with by pumping source 6 is coupled in doped optical fibre amplifier 8 jointly.Laser after amplification is through postponing optical fiber 9, and the length that postpones optical fiber 9 exceedes the coherence length of laser pulse.Acoustooptic switch 10, time that can control switch, when the superimposed pulses number in fiber optic loop reaches set point, open fiber optic loop, make the tail end output from fiber optic loop of incoherent laser in fiber optic loop.Detector 12 is for detection of parameters such as the power in fiber optic loop, and is connected with pumping source through reponse system, and the gain of FEEDBACK CONTROL fiber amplifier maintains the level of setting to the power of whole fiber optic loop.Amplitude modulaor 3, phase-modulator 4 and acoustooptic switch 10 are triggered by synchronous generator 11, make amplitude modulaor, phase-modulator and acoustooptic switch can keep correct sequential.
Operation principle of the present invention is as follows: the laser that continuous laser signal source 1 or any traditional laser send has very good coherence conventionally, and coherence length is very long, sometimes can reach several kilometers.Even if superpose after random phase-modulation, can not protect its coherence destroyed fall, cannot export reliable irrelevant light beam.In order to realize the output of light beam of reliable incoherent laser, the present invention is by after the propagation of the fibre delay line of the logical long-distance of laser pulse, make between laser pulse altogether irrelevant, through bundling device, superpose again, when the pulse number superposeing is abundant (as 100 of >), the laser beam producing will be altogether irrelevant, thereby guarantees the output of incoherent laser beam.In order to make the best results of superimposed pulses, the energy between the laser pulse that needs to guarantee to superpose is equal, and proportion is identical.In the present invention, by control the Implantation Energy of amplitude modulaor and in fiber optic loop by controlling the gain of fiber amplifier, can realize the energy balance between stack laser pulse.Total net gain (gain impairment consumption) β of fiber optic loop and the energy I of injection laser pulse
inmeet following relation:
wherein m
1superimposed pulse number in fiber optic loop, I
1for the pulse energy of first injection.So just can guarantee that between the laser pulse of stack, energy proportion equates, and in the scope that optical fiber and various device can bear.
For the synchronizing signal of each device, by synchronous generator control, its sequential as shown in Figure 2, first start working by amplitude modulaor 3, and the continuous wave that continuous wave laser is sent is modulated into pulse signal, pulse duration Δ t.Laser pulse arrives phase-modulator 4, and life period postpones
c is the light velocity, l
1for the effective fiber length between amplitude modulaor and phase-modulator, n is optical fibre refractivity.3 port acoustooptic switch 10, conventionally in normally off, maintain fiber optic loop and become closed loop state.When laser pulse circulation primary in fiber optic loop, in fiber optic loop, laser pulse completes non-coherent addition one time with the new laser pulse injecting, and when the umber of pulse of stack reaches designing requirement, synchronous generator triggers acoustooptic switch 10 opens it, and time delay is
l
2for the effective length of fiber optic loop, m is the laser pulse number of stack.
Embodiment 1:
Embodiments of the invention 1, the centre wavelength of described continuous laser signal is 1054 ± 2nm, live width < 1nm, power is 100mW, output optical fibre is the silica fiber of specification 6/125.The centre wavelength of described fibre optic isolater is 1054nm, and bandwidth of operation is ± 10nm, and insertion loss is 0.73dB, and damage threshold power is 1W, and reverse isolation degree is 31dB.The operation wavelength of described amplitude modulaor and phase-modulator is 1054nm.The first bundling device adopts the mono-cladded fiber bundling device of 2x1, work centre wavelength 1054nm, and bundling device the first port is 0.74dB to the insertion loss of the second port, the insertion loss of the second port to the three ports is 0.77dB.Loss during reverse transfer is 25dB, and crossover loss is 51dB, and damage threshold power is 3W.The laser diode that in fiber optic loop, pumping source is 970nm, Maximum Power Output 10W.Pump combiner is wavelength division multiplexing bundling device, the output of pumping source (output pumping optical wavelength 970nm) is coupled into fiber optic loop, for pumping gain fibre.Gain fibre is Yb dosed optical fiber, and described Yb dosed optical fiber is single covering Yb dosed optical fiber, and the diameter of fibre core is 6 microns, 125 microns of cladding diameters, and the absorption efficiency of Yb dosed optical fiber pumping is 0.6 ± 0.2dB/m, the length of Yb dosed optical fiber is 5m.
Transmission delay optical fiber adopts SMF28 silica fiber, length 2kM, and loss is 0.2dB/km.
The internal clocking frequency 20GHz of synchronous generator, the pulse frequency that is triggered control amplitude modulaor and phase-modulator by synchronous generator device is 5MHz, output pulse width is 10ns.According between amplitude modulaor and phase-modulator at a distance of 50cm, the delays in work 2ns of phase-modulation, therefore the sequential relative amplitude modulator of phase-modulator postpones 5.3ns.The overlapping pulses number of design is 100, and the delay that synchronizing signal triggering acoustooptic switch is opened is about 1.3mS, and concrete the delay can accurately be adjusted according to factors such as temperature, stress, and the pulse recurrence rate of the non-coherent bundle of output is about 0.75kHz.，
Embodiment 2:
Embodiment 2 is mainly for generation of the non-coherent bundle of polarization, and embodiment 1 is mainly for generation of unpolarized non-coherent bundle, and the centre wavelength of non-coherent bundle is also according to selected optical fiber, moves on to 1064nm.
The different selected device aspects that are mainly reflected in of embodiment 2 and embodiment 1, and for guaranteeing the polarization transmission and the interference reducing between fast and slow axis of polarization laser, in the middle of fiber optic loop, the fast and slow axis of polarization maintaining optical fibre is exchanged and staggered welding.In addition, gain fibre adopts double clad ytterbium-doped double-cladded-layer polarization maintaining optical fibre, and fibre core and inside and outside cladding diameter are 6/105/125 micron, and to increase the net gain of fiber amplifier, the length of gain fibre is also increased to 20m.Pump combiner also changes doubly clad optical fiber pump combiner into.Postpone the polarization maintaining optical fibre of optical fiber and Transmission Fibers employing PM1060.
Other selected devices comprise that the centre wavelengths such as continuous wave laser, isolator, bundling device, acoustooptic switch are 1064nm, and are all the device that polarization is relevant, and other parameter is identical with embodiment 1.
Claims (9)
1. export the fiber laser of non-coherent bundle for one kind, it is characterized in that, comprise continuous laser signal source (1), isolator (2), amplitude modulaor (3), phase-modulator (4), the first optical-fiber bundling device (5), pump light source (6), the second optical-fiber bundling device (7), doped optical fibre amplifier (8), postpone optical fiber (9), acoustooptic switch (10), synchronous generator (11) and detector (12);
Described continuous laser signal source (1), isolator (2), amplitude modulaor (3), phase-modulator (4), the input of the first optical-fiber bundling device (5) connects successively, the output of described the first optical-fiber bundling device (5), pump light source (6) is connected with the pumping end of the second optical-fiber bundling device (7) respectively, described the second optical-fiber bundling device (7) output, doped optical fibre amplifier (8), postpone optical fiber (9), acoustooptic switch (10) is connected successively with detector (12), described detector (12) is connected with the input of the first optical-fiber bundling device (5), described synchronous generator (11) respectively with amplitude modulaor (3), phase-modulator (4) is connected with acoustooptic switch (10).
2. a kind of fiber laser of exporting non-coherent bundle according to claim 1, it is characterized in that, described the first optical-fiber bundling device (5), the second optical-fiber bundling device (7), doped optical fibre amplifier (8), postpone optical fiber (9), acoustooptic switch (10) detector (12) is connected the rear fiber annular system that forms successively with the first optical-fiber bundling device (5), this fiber annular system is by again closing bundle the pulse signal sending by amplitude modulaor in time, pulse signal has eliminated coherence after fiber annular system, close the output that realizes incoherent laser beam after bundle.
3. a kind of fiber laser of exporting non-coherent bundle according to claim 1, is characterized in that, described delay optical fiber (9) exceedes the delay optical fiber of Output of laser coherence length for length.
4. a kind of fiber laser of exporting non-coherent bundle according to claim 1, it is characterized in that, the continuous signal that described amplitude modulaor (3) sends continuous laser signal source (1) is carried out Modulation and Amplitude Modulation, realizes the laser pulse output of random waveform.
5. a kind of fiber laser of exporting non-coherent bundle according to claim 2, it is characterized in that, described the second optical-fiber bundling device (7) is pump combiner, the flashlight of the first optical-fiber bundling device (5) output and the pump light being sent by pump light source (6) are coupled in doped optical fibre amplifier (8) jointly, and doped optical fibre amplifier (8) is input to the laser after amplifying to postpone in optical fiber (9).
6. a kind of fiber laser of exporting non-coherent bundle according to claim 5, it is characterized in that, described acoustooptic switch (10) judges whether the laser pulse stack number postponing in optical fiber (9) reaches set point, if yes, open acoustooptic switch (10), by incoherent Laser output.
7. a kind of fiber laser of exporting non-coherent bundle according to claim 6, is characterized in that, described acoustooptic switch (10) capable of regulating switch closing time, the circulation number of turns of the fiber annular system of control impuls and pulse overlap number.
8. a kind of fiber laser of exporting non-coherent bundle according to claim 2, it is characterized in that, described doped optical fibre amplifier (8) is used for making up the loss in fiber annular system, energy while making pulsed light get back to the first optical-fiber bundling device (5) through a circle is identical with original signal luminous energy value, allow finally to close the energy value of intrafascicular every part of flashlight identical, the shared ratio of every part of flashlight is identical, to realize the output of incoherent laser beam.
9. a kind of fiber laser of exporting non-coherent bundle according to claim 2, it is characterized in that, described synchronous generator (11) is controlled the switching sequence of amplitude modulaor (3), phase-modulator (4) and acoustooptic switch (10).
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Cited By (5)
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| CN105826809A (en) * | 2016-06-08 | 2016-08-03 | 中国人民解放军国防科学技术大学 | Single-frequency pulse full fiber laser device based on self-phase modulation precompensation |
| CN106556415A (en) * | 2015-09-28 | 2017-04-05 | 中兴通讯股份有限公司 | Laser phase noise elimination apparatus, system and method |
| CN109616860A (en) * | 2019-02-12 | 2019-04-12 | 北京交通大学 | A kind of fiber amplifier |
| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
| CN110915079A (en) * | 2017-06-28 | 2020-03-24 | 通快激光有限责任公司 | Dynamic seeding of laser amplifier systems |
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| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
| CN109818237B (en) * | 2019-03-28 | 2021-01-01 | 上海交通大学 | Ultrashort laser pulse shaping system based on optical fiber ring circulation modulation time grating |
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| CN103762486B (en) | 2016-07-06 |
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