CN202221867U - High-power acoustic optical modulator Q-switched pulse fiber laser - Google Patents
High-power acoustic optical modulator Q-switched pulse fiber laser Download PDFInfo
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- CN202221867U CN202221867U CN2011201672544U CN201120167254U CN202221867U CN 202221867 U CN202221867 U CN 202221867U CN 2011201672544 U CN2011201672544 U CN 2011201672544U CN 201120167254 U CN201120167254 U CN 201120167254U CN 202221867 U CN202221867 U CN 202221867U
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Abstract
The utility model discloses a high-power acoustic optical modulator Q-switched pulse fiber laser, which comprises an optical path module, a circuit module, a resonant cavity and a fiber optic amplifier. The optical patch module comprises a pump source which is used for generating pump laser and comprises a plurality of pump lasers, the resonant cavity is used for converting the pump laser into pulse laser, a high reflector and an acoustic optical modulator are arranged in the resonant cavity which is connected with the pump source, and the fiber optic amplifier is used for outputting the pulse laser after power amplifying. Preferably, the reflecting bandwidth of the high reflector can be 100nm, the reflecting rate of the high reflector is up to 99%, and the high reflector is capable of bearing peak power of dozens of kilowatts and average power of dozens of watts. Therefore, by means of the high-power acoustic optical modulator Q-switched pulse fiber laser, the problem of narrowing of a spectral bandwidth of the laser outputted under the condition of a certain pulse peak power is solved, non-linear SBS (stimulated Brillouin scattering) of the laser can be avoided, and the high-power acoustic optical modulator Q-switched pulse fiber laser has quite high reliability.
Description
Technical field
The utility model relates to laser technology field, relates in particular to a kind of acousto-optic Q modulation high power pulse fiber laser.
Background technology
Along with the development of laser technology, laser processing is also popularized gradually, and in laser processing, fiber laser has irreplaceable effect.Pulse optical fiber is arranged at present in the world; The technical scheme that adopts is with the fiber grating (FBG) in broadband, several nanometers left and right sides at the zero point high reflective mirror as resonant cavity; The lower fiber grating of the luminance factor of dedicated bandwidth several nanometers at zero point is as the low anti-mirror of resonant cavity; In resonant cavity with the acoustooptic Q-switching of optical fiber coupling transfer Q produce tens nanoseconds to the light pulse of hundreds of nanosecond order as seed source, obtain the burnt light pulse of several millis at zero point after amplifying through one-level or secondary double-cladding fiber amplifier then to the burnt magnitudes of several millis.
But, this poor as the pulse optical fiber temperature stability of high reflective mirror with FBG, when environment changes; The centre wavelength of FBG is easy to drift about, and high anti-grating and the low anti-easy mismatch of grating cause the spectral bandwidth of laser to narrow down; Under the situation of the power of certain peak value of pulse; Be easy to generate non-linear stimulated Brillouin scattering SBS, through after level amplify the back and produce high peak power, be prone to cause optical fiber to blow; This also is the basic reason of the poor reliability of at present domestic and international Q impulse fiber laser; According to statistics, the repair rate of the external pulse optical fiber of producing is about 10%, and adopts FBG to do high anti-repair rate to be approximately 70%～10%.
Can know that to sum up existing acousto-optic Q modulation high power pulse fiber laser obviously exists inconvenience and defective, so be necessary to improve on reality is used.
The utility model content
To above-mentioned defective, the purpose of the utility model is to provide a kind of acousto-optic Q modulation high power pulse fiber laser, and it can avoid producing non-linear stimulated Brillouin scattering SBS, has very high reliability.
To achieve these goals, the utility model provides a kind of acousto-optic Q modulation high power pulse fiber laser, comprises light path module and circuit module, and said light path module comprises
Be used to produce the pumping source of pumping laser, comprise some pump lasers;
Be used for said pumping laser is converted into the resonant cavity of pulse laser, have high reflective mirror and acousto-optic modulator in the said resonant cavity, and said resonant cavity is connected in said pumping source;
Be used for said pulse laser is carried out the fiber amplifier exported after the power amplification.
Acousto-optic Q modulation high power pulse fiber laser according to the utility model; Also have low anti-mirror and bundling device in the said resonant cavity; Said low anti-mirror is connected in said acousto-optic modulator; Said high reflective mirror is connected in said bundling device, and said bundling device is connected through yb-doped double-clad fiber with acousto-optic modulator.
According to the acousto-optic Q modulation high power pulse fiber laser of the utility model, said light path module also comprises a fiber coupler, and said resonant cavity is connected with said fiber coupler through an optical isolator.
According to the acousto-optic Q modulation high power pulse fiber laser of the utility model, said fiber coupler one end connects a photodetector, and the other end connects said fiber amplifier.
According to the acousto-optic Q modulation high power pulse fiber laser of the utility model, said fiber amplifier comprises first order fiber amplifier and second level fiber amplifier.
Acousto-optic Q modulation high power pulse fiber laser according to the utility model; Said fiber amplifier comprises pumping source, bundling device and ytterbium-doped double-clad fiber amplifier, and said pumping source, ytterbium-doped double-clad fiber amplifier all are connected with said bundling device with fiber coupler.
According to the acousto-optic Q modulation high power pulse fiber laser of the utility model, the reflection bandwidth of said high reflective mirror is 100nm, and reflectivity is 99%.
Acousto-optic Q modulation high power pulse fiber laser according to the utility model is connected with an isolator between said first order fiber amplifier and the second level fiber amplifier.
According to the acousto-optic Q modulation high power pulse fiber laser of the utility model, said circuit module comprises:
Be used to drive the pumping drive circuit of said fiber amplifier;
Be used to drive the laser driver of said pump laser;
Be used to drive the acousto-optic drive circuit of said acousto-optic modulator;
Be used in no extraneous triggering signal or output pulse repetition frequency when too high the protective circuit that said laser is protected automatically;
Be used to be provided with the output control circuit of pulsewidth, repetition and the power output of said fiber laser;
The temperature-control circuit that is used for the automatic control circuit temperature.
The utility model produces pumping laser through pumping source, again through producing pulse laser behind the resonant cavity, by fiber amplifier pulse laser is amplified back output again.Has a fiber reflector in the resonant cavity as high reflective mirror; Preferably; This high reflective mirror has very big reflection bandwidth and reflectivity; Can bear tens kilowatts peak power and tens watts average power, can effectively avoid the non-linear stimulated Brillouin scattering SBS of laser, improve the reliability of fiber laser.
Description of drawings
Fig. 1 is the structural representation of the light path module of the utility model one embodiment;
Fig. 2 is the structural representation of the light path module of another embodiment of the utility model;
Fig. 3 is the structural representation of the circuit module of the utility model one embodiment;
Fig. 4 is the appearance assumption diagram of the fiber amplifier of the utility model one embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Referring to Fig. 1 and Fig. 3; The utility model provides a kind of acousto-optic Q modulation high power pulse fiber laser; It comprises light path module 100 and circuit module 200, and light path module 100 is used for the conversion and the transmission of laser signal, and circuit module 200 is used for driving to each optical fibre device of light path module 100 being provided.Concrete, light path module 100 comprises:
In the utility model one specific embodiment; Light path module 100 also comprises a fiber coupler 30; Resonant cavity 20 is connected with fiber coupler 30 through an optical isolator 40; Two outputs, one end of fiber coupler 30 connects a photodetector 50, and the other end connects fiber amplifier 60, and optical isolator 40 can guarantee the one-way transmission of laser pulse in light path.Concrete; The pulse laser that is produced by resonant cavity 20 transfers to fiber coupler 30 through optical isolator 40; Fiber coupler 30 is coupled as the two-way laser signal with said pulse laser; One tunnel laser signal transmission to said photodetector 50, another road laser signal then transfers to the bundling device 22 of fiber amplifier 60.Bundling device 22 closes bundle with fiber coupler 30 signal that 10 transmission come with pumping source, and will close laser signal behind the bundle and be sent to ytterbium-doped double-clad fiber amplifier 61 and carry out processing and amplifying, and the pulse laser after the amplification is exported behind optical isolator 40.
Preferably; Fiber amplifier 60 can comprise two-stage or multistage amplification light path; Among the embodiment as shown in Figure 2; Fiber amplifier 60 comprises first order fiber amplifier 70 and second level fiber amplifier 80, for guaranteeing the one-way transmission of laser intelligence, is connected with an optical isolator 40 between first order fiber amplifier 70 and the second level fiber amplifier 80 simultaneously.Whereby, pulse laser can pass through the high power laser signal that obtains needs after two-stage is amplified.
The high reflective mirror 21 of the employing of the utility model is simple in structure; When producing without any need for manual adjustments, directly welding is advanced optical fiber and get final product, it is insensitive to the influence that temperature or external environment variation cause; The fiber grating FBG of low anti-mirror 24 receive ectocine and the wave length shift that causes not can with high reflective mirror 21 mismatches; Can avoid the non-linear stimulated Brillouin scattering SBS of seed laser whereby, and then effectively protect optical fiber, improve the reliability of transferring the fiber laser of Q greatly.
Referring to Fig. 3, the circuit module 200 of the utility model fiber laser comprises again:
Pumping drive circuit 201 is used to drive fiber amplifier 60, and pumping drive circuit 201 is high power device with fiber amplifier 60.
Laser driver 202, the pump laser that is used to drive said pumping source 10 produces pumping laser.
Acousto-optic drive circuit 203 is used to drive acousto-optic modulator 23, through the Q value of acousto-optic modulator 23 adjustment resonant cavitys 20, makes the pulse laser of the low anti-mirror 24 outputs needs of resonant cavity 20 whereby.
Protective circuit 204 is used for, fiber laser being protected automatically when too high in no extraneous triggering signal or output pulse repetition frequency.
Temperature-control circuit 205, this circuit is the ATC temperature control circuit, is used for the temperature of automatic control circuit, improves the stability of fiber laser wavelength.
Output control circuit 206 is used to control pulsewidth, repetition and the power that fiber laser is exported.
Fig. 4 is the utility model fiber laser one surface structure sketch map, and fiber laser has optical fiber outlet 101, is used for the output of laser signal, and it can connect the output of light path module 100; Control interface 102 connects output control circuit 206, is used for the setting to the output laser parameter; Power interface 103 is used to connect working power; Data transmission interface 104 is used to transmit data.
The pulse optical fiber of the utility model can reach following technical standard:
Operation wavelength: 1064nm wave band; Pulse energy 1mJ; Pulse duration 20ns-200ns is adjustable; Pulse repetition frequency 20KHz-500KHz; Output average power 10-50W level.It can be widely used in a plurality of fields such as high-precision laser imaging radar, high-precision optical fiber temperature-sensing system, the little vibration sensing system of high-precision optical fiber, high-precision laser processing, laser-Doppler windfinding radar, laser communications system, laser medicine, electrooptical countermeasures and scientific research.
Below in conjunction with diagram, specify an application process of the utility model.
With Fig. 2 is example; The pump laser of pumping source 10 drives through powerful laser driver 202, produces pumping laser, behind the pumping protection device; (1+N) * 1 bundling device 22 that pumping laser gets into resonant cavity 20 closes the pulse laser that bundle produces 20ns～200ns; This moment pulsed laser power very faint, can amplify through yb-doped double-clad fiber 25, export down in the accent Q of acousto-optic modulator 23 control.Pulse laser after the output is divided into two-way through fiber coupler 30, and one the road reaches photodetector 50, and one the tunnel gets into first order fiber amplifier 70.The bundling device 22 of first order fiber amplifier 70 closes pumping laser and this road pulse signal and will close the bundle laser signal behind the bundle and be sent to double-cladding fiber amplifier 61 and amplify; Can obtain the pulsed optical fibre laser output of multikilowatt peak power, the laser signal after the amplification can obtain the pulsed optical fibre laser output of 20KW peak power and 10-50W average power again after second level fiber amplifier 80 amplifies.
The utility model adopts the high reflective mirror 21 of the fiber reflector of research and development production voluntarily as the optical fiber Q-switched laser; Solved under certain pulse peak power situation the problem that the spectral bandwidth of output laser narrows down; Can not cause the non-linear SBS of seed laser; Can not blow optical fiber yet, improve the reliability of transferring the fiber laser of Q greatly.Simultaneously, because the reflection bandwidth of high reflective mirror 21 can reach 100nm, through particular design; Reflectivity also can reach 99%, and with the optical fiber coupling, can bear tens kilowatts peak power and tens watts average power; And because the circuit module 200 of laser can be protected whole laser automatically; Improve the reliability of laser whereby, through practical application, the repair rate of the high-power Q-switched pulse optical fiber of the average power 10W of the utility model～50W is in 1%.
In sum, the utility model produces pumping laser through pumping source, again through producing pulse laser behind the resonant cavity, by fiber amplifier pulse laser is amplified back output again.Has a fiber reflector in the resonant cavity as high reflective mirror; Preferably; This high reflective mirror has very big reflection bandwidth and reflectivity; Can bear tens kilowatts peak power and tens watts average power, can effectively avoid the non-linear stimulated Brillouin scattering SBS of laser, improve the reliability of fiber laser.
Certainly; The utility model also can have other various embodiments; Under the situation that does not deviate from the utility model spirit and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (7)
1. an acousto-optic Q modulation high power pulse fiber laser comprises light path module and circuit module, it is characterized in that, said light path module comprises
Be used to produce the pumping source of pumping laser, comprise some pump lasers;
Be used for said pumping laser is converted into the resonant cavity of pulse laser, have high reflective mirror and acousto-optic modulator in the said resonant cavity, and said resonant cavity is connected in said pumping source;
Be used for said pulse laser is carried out the fiber amplifier exported after the power amplification.
2. acousto-optic Q modulation high power pulse fiber laser according to claim 1 is characterized in that said light path module also comprises a fiber coupler, and said resonant cavity is connected with said fiber coupler through an optical isolator.
3. acousto-optic Q modulation high power pulse fiber laser according to claim 2 is characterized in that, said fiber coupler one end connects a photodetector, and the other end connects said fiber amplifier.
4. acousto-optic Q modulation high power pulse fiber laser according to claim 1 is characterized in that said fiber amplifier comprises first order fiber amplifier and second level fiber amplifier.
5. acousto-optic Q modulation high power pulse fiber laser according to claim 1 is characterized in that the reflection bandwidth of said high reflective mirror is 100nm, and reflectivity is 99%.
6. acousto-optic Q modulation high power pulse fiber laser according to claim 4 is characterized in that, is connected with an isolator between said first order fiber amplifier and the second level fiber amplifier.
7. acousto-optic Q modulation high power pulse fiber laser according to claim 1 is characterized in that said circuit module comprises:
Be used to drive the pumping drive circuit of said fiber amplifier;
Be used to drive the laser driver of said pump laser;
Be used to drive the acousto-optic drive circuit of said acousto-optic modulator;
Be used in no extraneous triggering signal or output pulse repetition frequency when too high the protective circuit that said laser is protected automatically;
Be used to be provided with the output control circuit of pulsewidth, repetition and the power output of said fiber laser;
The temperature-control circuit that is used for the automatic control circuit temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201672544U CN202221867U (en) | 2011-05-24 | 2011-05-24 | High-power acoustic optical modulator Q-switched pulse fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201672544U CN202221867U (en) | 2011-05-24 | 2011-05-24 | High-power acoustic optical modulator Q-switched pulse fiber laser |
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| Publication Number | Publication Date |
|---|---|
| CN202221867U true CN202221867U (en) | 2012-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201672544U Expired - Lifetime CN202221867U (en) | 2011-05-24 | 2011-05-24 | High-power acoustic optical modulator Q-switched pulse fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785837A (en) * | 2016-12-15 | 2017-05-31 | 吉林大学 | One kind eliminates the Q impulse optical fiber laser output rough control method of pulse |
| CN115415673A (en) * | 2022-09-15 | 2022-12-02 | 浙江金洲激光科技有限公司 | Kilowatt-level high-power laser cleaning equipment |
-
2011
- 2011-05-24 CN CN2011201672544U patent/CN202221867U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785837A (en) * | 2016-12-15 | 2017-05-31 | 吉林大学 | One kind eliminates the Q impulse optical fiber laser output rough control method of pulse |
| CN115415673A (en) * | 2022-09-15 | 2022-12-02 | 浙江金洲激光科技有限公司 | Kilowatt-level high-power laser cleaning equipment |
| CN115415673B (en) * | 2022-09-15 | 2023-11-14 | 浙江金洲激光科技有限公司 | Kilowatt-level high-power laser cleaning equipment |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 518103, Guangdong, Shenzhen, Baoan District manhole street and a community third industrial zone, Ming Xin Industrial Park, first, third, B Patentee after: MAXPHOTONICS Co.,Ltd. Address before: 518000, Guangdong, Shenzhen, Baoan District manhole, South Ring Road, and a third industrial zone, Ming Xin Industrial Park, second, third Patentee before: Maxphotonics Co., Ltd. |
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| CP02 | Change in the address of a patent holder |
Address after: 518125 Building A2, Building A3, Building 2-3, Building A4, Building A5, Building 6, Building A2, Furong Third Road, Shajing Street, Baoan District, Shenzhen City, Guangdong Province Patentee after: MAXPHOTONICS Co.,Ltd. Address before: 518103 Shajing Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: MAXPHOTONICS Co.,Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120516 |
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| CX01 | Expiry of patent term |