CN104538832A - Pulse laser time domain frequency doubling device - Google Patents
Pulse laser time domain frequency doubling device Download PDFInfo
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- CN104538832A CN104538832A CN201410662292.5A CN201410662292A CN104538832A CN 104538832 A CN104538832 A CN 104538832A CN 201410662292 A CN201410662292 A CN 201410662292A CN 104538832 A CN104538832 A CN 104538832A
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Abstract
The invention relates to the technical field of laser, and particularly discloses a pulse laser time domain frequency doubling device. The device comprises a tested laser light source, and a coupling lens group, an optical splitter, a delayer and a beam combiner which are arranged along a light path, wherein the coupling lens group is used for gathering laser light output by the tested laser light source onto the optical splitter; the optical splitter is used for performing beam splitting on the output laser light according to equal proportions; the delayer is used for increasing the optical path of each path of beam-split laser light; and the beam combiner is used for combining each path of delayed laser light to form frequency-doubled laser light. Time domain frequency doubling is performed specific to the laser light source, so that frequency doubling of 1-10 times on the time domain of pulse laser light is realized. Meanwhile, a photonic crystal optical waveguide or a photonic crystal optical fiber is taken as an optical path prolonging structure in the device, and a photonic crystal has a very high refractive index, so that the size of the device can be greatly reduced, and the miniaturization and practicability of the device are realized.
Description
Technical field
The present invention relates to laser technology field, particularly a kind of pulse laser time-domain frequency doubling device.
Background technology
Pulse repetition frequency is the important technology index of pulse laser in time-domain, and this technical indicator is one of bottleneck factor restricting a series of laser application.Such as, be that the pulse repetition frequency of the solid state laser of pumping source is difficult to be greater than 50Hz usually with photoflash lamp, the flash-lamp pump pumping solid laser repetition rate that energy reaches joule or sub-joule level is difficult to more than 20Hz; The repetition rate of CO 2 pulse laser device is usually at below 1000Hz, and the CO 2 pulse laser device of little energy, repetition rate is also difficult to reach 5kHz.
The generation of above-mentioned pulse repetition frequency bottleneck, trace it to its cause be working-laser material thermal effect, refrigeration means, copped wave or adjust Q technical merit development limited.The domestic and international frequency multiplication mainly concentrated on for laser frequency multiplier on optimal frequency domain at present, and cause reducing by half of laser output wavelength thus.
Chinese patent " efficient laser frequency doubler " (application number: 200410009783.6) protect a kind of frequency doubling device comprising fundamental frequency lasers, beam splitter, coherently combined device and nonlinear crystal; fundamental frequency lasers is by optics coherence tomography again after beam splitting; using the pumping source of the laser after synthesis as frequency double laser; pumped nonlinear optical crystal, finally exports high transformation efficiency double-frequency laser.
Chinese patent " a kind of high energy laser frequency multiplication Q-modulating device " (application number: 201210175979.7) protect a kind of high energy laser frequency multiplication Q-modulating device; comprise a linear polarization electric-optically Q-switched laser generating means, two or more light splitting frequency doubling device and a light combination mirror group; spectroscope in each light splitting frequency doubling device is arranged in the laser emitting light path of linear polarization electric-optically Q-switched laser generating means, by light combination mirror group, multi-path laser is carried out the output of shaping conjunction bundle and realizes frequency multiplication.
European patent " Optical frequency doubling device " (patent No.: EP0429319) protects a kind of frequency doubling device adopting annular reflection cavity configuration, also just realizes the frequency multiplication of optimal frequency domain; United States Patent (USP) 4896931 protects a kind of optical frequency frequency doubling device, adopts the structure of fiber waveguide to realize the frequency multiplication of optimal frequency domain.There is no the frequency doubling device for time-domain (pulse repetition frequency) at present.
Summary of the invention
The present invention is intended to the defect overcoming existing pulse laser technology, realizes pulse laser time-domain frequency multiplication, provides a kind of pulse laser time-domain frequency doubling device.
For achieving the above object, the present invention is by the following technical solutions:
On the one hand, the invention provides a kind of pulse laser time-domain frequency doubling device, comprise measured laser light source, also comprise: along coupled lens group, optical splitter, delayer, the bundling device of light path arrangement; Described coupled lens group, gathers described optical splitter for the laser exported by measured laser light source; Described optical splitter, proportionally waits beam splitting for the laser that will export; Described delayer, the light path for each road laser to beam splitting increases; Described bundling device, for being merged by delayed each road laser, forms the laser after frequency multiplication.
In some embodiments, also comprise the rear beam expanding lens group of the collimation for Output of laser, described coupled lens group, optical splitter, delayer, bundling device, rear beam expanding lens group are arranged successively along light path.
In some embodiments, described rear beam expanding lens group is spherical lens, and its focal range is 10 to 1000mm.
In some embodiments, the group number one_to_one corresponding of described optical splitter and delayer.
In some embodiments, beam splitting such as described grade is for being proportionally divided into 2 to 10 bundles.
In some embodiments, described optical splitter is fiber splitter, and described delayer is that photonic crystal fiber is formed, and described bundling device is optical-fiber bundling device.
In some embodiments, described optical splitter is fiber waveguide optical splitter, and described delayer is that photon crystal wave-guide is formed, and described bundling device is fiber waveguide bundling device.
In some embodiments, described coupled lens group is the set of lenses of 1 or 2 non-spherical lens composition.
Again on the other hand, the invention provides a kind of pulse laser time-domain frequency doubling device, comprise measured laser light source, also comprise: optical splitter, delayer, bundling device and auxiliary mirror group, described auxiliary mirror group comprises the first auxiliary mirror and the second auxiliary mirror; Wherein, described optical splitter, delayer, the first auxiliary mirror and bundling device form the first light path; Described optical splitter, the second auxiliary mirror and bundling device form the second light path; Described optical splitter, for beam splitting such as the laser that measured laser light source exports; Described delayer, the light path for each road laser to beam splitting increases; Described bundling device, for being merged by the laser of beam splitting, forms the laser after frequency multiplication.
In some embodiments, described optical splitter is partially reflecting mirror; Described delayer is made up of photonic crystal fiber; Described bundling device is partially reflecting mirror.
Beneficial effect of the present invention is: apparatus of the present invention carry out time-domain (pulse repetition frequency) frequency multiplication for LASER Light Source, realizes time-domain (pulse repetition frequency) 1 to 10 times of frequency multiplication of paired pulses laser; Meanwhile, apparatus of the present invention adopt photonic crystal optical waveguides or photonic crystal fiber as optical path lengthening structure, because photonic crystal has very high refractive index, can significantly reduction of device volume, and realize the miniaturization of device and practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of pulse laser time-domain frequency doubling device according to an embodiment of the invention.
Fig. 2 is the structural representation of pulse laser time-domain frequency doubling device according to an embodiment of the invention.
Fig. 3 is the structural representation of pulse laser time-domain frequency doubling device according to an embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not construed as limiting the invention.
Photonic crystal (Photonic Crystal) is the artificial micro-structure arranged by the medium period of different refractivity.Photonic crystal and forbidden photon band material, from material structure, photonic crystal is that a class has the engineer of periodic dielectric structures and the crystal of manufacture on optics yardstick.
Similar with the modulation of semiconductor lattice to electron wave function, photonic bandgap material can modulate the electromagnetic wave with respective wavelength.When electromagnetic wave is propagated in photonic bandgap material, modulated owing to there is Bragg diffraction, electromagnetic wave energy forms band structure.
By Design and manufacture photonic crystal and device thereof, the object controlling photon motion can be reached, realize the equivalent optical structure of refractive index more than 10000.By this for photonic crystal new optics is introduced light path system, the optical delay structure with small size can be developed, realize time-domain (pulse repetition frequency) frequency multiplication of pulse laser.
The invention reside in the time-domain frequency bottleneck problem solving and occur in existing laser technology, a kind of frequency doubling device is provided, realize time-domain (pulse repetition frequency) frequency multiplication that existing laser exports.Such as realize the repetition rate of flash-lamp pump pumping solid laser from 50Hz to 100Hz, 150Hz, 200Hz even more high repetition frequency transformation export; Or realize the repetition rate of CO 2 pulse laser device from 1000Hz to 2000Hz, 4000Hz, 5000Hz export.
A kind of pulse laser time-domain frequency doubling device of the present invention, comprises measured laser light source, along coupled lens group, optical splitter, delayer, the bundling device of light path arrangement; Coupled lens group, gathers optical splitter for the laser exported by measured laser light source; Optical splitter, proportionally waits beam splitting for the laser that will export; Delayer, the light path for each road laser to beam splitting increases; Bundling device, for being merged by delayed each road laser, forms the laser after frequency multiplication.
In some preferred versions, the group number one_to_one corresponding of optical splitter and delayer; Beam splitting such as above-mentioned grade is for being proportionally divided into 2 to 10 bundles.
In some preferred versions, this pulse laser time-domain frequency doubling device also comprises rear beam expanding lens group, and for the collimation of Output of laser, above-mentioned coupled lens group, optical splitter, delayer, bundling device, rear beam expanding lens group are arranged successively along light path.
The present invention, by the time-domain frequency multiplication to existing Laser Output Beam, utilizes polarized combination technology and photonic crystal optical path delay technology, and the repetition rate integral multiple realizing pulse laser increases, and solves pulse repetition frequency bottleneck problem to a certain extent.
Embodiment 1
As shown in Figure 1, be the structural representation of pulse laser time-domain frequency doubling device embodiment 1 of the present invention.Coupled lens group 1, optical splitter 2, delayer 3, bundling device 4 and rear beam expanding lens group 5 is arranged successively along light path.
Wherein, coupled lens group 1 is the set of lenses be made up of 2 non-spherical lenses, and the light for being exported by laser converges in fiber waveguide; Optical splitter 2 is fiber waveguide optical splitter, is divided into 6 bundles for the laser exported by measured laser light source; Delayer 3, it is made up of the photon crystal wave-guide of length 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, corresponding with the repetition rate of laser, for increasing the light path of each road Output of laser, realizes time delay; Bundling device 4 is fiber waveguide bundling device, for each Shu Guang is merged, and the laser after the frequency multiplication of formation time territory; Rear beam expanding lens group 5, for the collimation of Output of laser, focal length of lens scope, at 10 to 1000mm, in embodiments of the present invention, specifically adopts the spherical lens of a slice diameter 25mm, focal length 100mm.
The length 10mm of the photon crystal wave-guide in above-mentioned delayer 3,12mm, 14mm, 16mm, 18mm, 20mm calculate in detail according to the repetition rate 20Hz of photon crystal wave-guide refractive index and Output of laser and customize, each height Shu Jiguang after light splitting is after the optical path difference of 2mm, just realize the corresponding 0.3333ms of 300Hz to postpone, when after 6 bundle combiners, form the Laser output of repetition rate 300Hz, realize pulse laser time-domain frequency multiplication.
Embodiment 2
As shown in Figure 1, be the structural representation of pulse laser time-domain frequency doubling device embodiment 2 of the present invention.Coupled lens group 1, optical splitter 2, delayer 3, bundling device 4 and rear beam expanding lens group 5 is arranged successively along light path.
Wherein, coupled lens group 1 is the set of lenses be made up of 2 non-spherical lenses, and the light for being exported by laser converges in fiber waveguide; Optical splitter 2 is fiber waveguide optical splitter, is divided into 2 bundles for the laser exported by measured laser light source; Delayer 3, it is made up of the photon crystal wave-guide of length 10mm, 12mm, corresponding with the repetition rate of laser, for increasing the light path of each road Output of laser, realizes time delay; Bundling device 4 is fiber waveguide bundling device, for each Shu Guang is merged, and the laser after the frequency multiplication of formation time territory; Rear beam expanding lens group 5, for the collimation of Output of laser, focal length of lens scope, at 10 to 1000mm, in embodiments of the present invention, specifically adopts the spherical lens of a slice diameter 25mm, focal length 20mm.
Length 10mm, the 12mm of the photon crystal wave-guide in above-mentioned delayer 3 calculate in detail according to the repetition rate 20Hz of photon crystal wave-guide refractive index and Output of laser and customize, each height Shu Jiguang after light splitting is after the optical path difference of 2mm, just realize the corresponding 0.3333ms of 300Hz to postpone, when after 2 bundle combiners, form the Laser output of repetition rate 300Hz, realize pulse laser time-domain frequency multiplication.
Embodiment 3
As shown in Figure 2, be the structural representation of pulse laser time-domain frequency doubling device embodiment 3 of the present invention.Coupled lens group 1, optical splitter 21, delayer 31, bundling device 41 is arranged successively along light path.
Wherein, coupled lens group 1 is for be made up of 1 non-spherical lens, and the light for being exported by laser converges in optical fiber; Optical splitter 21 is fiber splitter, is divided into 3 bundles for the laser exported by measured laser light source; Delayer 31, is made up of the photonic crystal fiber of length 0.5m, 3.52m, 6.54m, matches with the 10Hz repetition rate of laser, for increasing the light path of each road Output of laser, realizes time delay; Bundling device 41 is optical-fiber bundling device, for each Shu Guang is merged, and the laser after the frequency multiplication of formation time territory.
The length 0.5m of the photonic crystal fiber in above-mentioned delayer 3,3.52m, 6.54m calculate in detail according to the repetition rate 10Hz of photon crystal wave-guide refractive index and Output of laser and customize, each height Shu Jiguang after light splitting is after optical path difference, just realize postponing, when after 3 bundle combiners, form the Laser output of repetition rate 30Hz, realize pulse laser time-domain frequency multiplication.
The present invention also provides a kind of pulse laser time-domain frequency doubling device, comprises measured laser light source, optical splitter, delayer, bundling device and auxiliary mirror group, and auxiliary mirror group comprises the first auxiliary mirror and the second auxiliary mirror; Wherein, optical splitter, delayer, the first auxiliary mirror and bundling device form the first light path; Optical splitter, the second auxiliary mirror and bundling device form the second light path; Optical splitter, for beam splitting such as the laser that measured laser light source exports; Delayer, the light path for each road laser to beam splitting increases; Bundling device, for being merged by the laser of beam splitting, forms the laser after frequency multiplication.
Embodiment 4
As shown in Figure 3, be the structural representation of pulse laser time-domain frequency doubling device embodiment 4 of the present invention.It comprises optical splitter 22, delayer 32, bundling device 42 and auxiliary mirror group.
Wherein, optical splitter 22 is partially reflecting mirror, is divided into 2 bundles for the laser realized measured laser light source exports; Delayer 32, is made up of the photonic crystal fiber of length in 0.1m to 1000m scope, in the present embodiment, concrete employing length 21m photonic crystal fiber is formed, matching with the 1000Hz repetition rate of laser, for increasing the light path of this road Output of laser, realizing time delay; Bundling device 42 is partially reflecting mirror, is used for two-beam to merge, the laser after the frequency multiplication of formation time territory.
A son bundle laser after light splitting, after certain optical path difference, just realizes the delay of 1000Hz laser, forms the Laser output of repetition rate 2000Hz after closing bundle.
Pulse laser time-domain frequency doubling device of the present invention carries out time-domain (pulse repetition frequency) frequency multiplication for LASER Light Source, realizes time-domain (pulse repetition frequency) 1 to 10 times of frequency multiplication of paired pulses laser; Meanwhile, adopt photonic crystal optical waveguides or photonic crystal fiber as optical path lengthening structure, because photonic crystal has very high refractive index, can significantly reduction of device volume, realize the miniaturization of device and practical.
The above the specific embodiment of the present invention, does not form limiting the scope of the present invention.Any various other done by technical conceive of the present invention change and distortion accordingly, all should be included in the protection range of the claims in the present invention.
Claims (10)
1. a pulse laser time-domain frequency doubling device, comprises measured laser light source, it is characterized in that, also comprise: along coupled lens group, optical splitter, delayer, the bundling device of light path arrangement;
Described coupled lens group, gathers described optical splitter for the laser exported by measured laser light source;
Described optical splitter, proportionally waits beam splitting for the laser that will export;
Described delayer, the light path for each road laser to beam splitting increases;
Described bundling device, for being merged by delayed each road laser, forms the laser after frequency multiplication.
2. pulse laser time-domain frequency doubling device as claimed in claim 1, it is characterized in that, also comprise the rear beam expanding lens group of the collimation for Output of laser, described coupled lens group, optical splitter, delayer, bundling device, rear beam expanding lens group are arranged successively along light path.
3. pulse laser time-domain frequency doubling device as claimed in claim 1, it is characterized in that, described rear beam expanding lens group is spherical lens, and its focal range is 10 to 1000mm.
4. pulse laser time-domain frequency doubling device as claimed in claim 1, is characterized in that, the group number one_to_one corresponding of described optical splitter and delayer.
5. pulse laser time-domain frequency doubling device as claimed in claim 4, is characterized in that, beam splitting such as described grade is for being proportionally divided into 2 to 10 bundles.
6. pulse laser time-domain frequency doubling device as claimed in claim 4, it is characterized in that, described optical splitter is fiber splitter, and described delayer is that photonic crystal fiber is formed, and described bundling device is optical-fiber bundling device.
7. pulse laser time-domain frequency doubling device as claimed in claim 4, it is characterized in that, described optical splitter is fiber waveguide optical splitter, and described delayer is that photon crystal wave-guide is formed, and described bundling device is fiber waveguide bundling device.
8. pulse laser time-domain frequency doubling device as claimed in claim 1, is characterized in that, described coupled lens group is the set of lenses of 1 or 2 non-spherical lens composition.
9. a pulse laser time-domain frequency doubling device, comprises measured laser light source, it is characterized in that, also comprise: optical splitter, delayer, bundling device and auxiliary mirror group, and described auxiliary mirror group comprises the first auxiliary mirror and the second auxiliary mirror;
Wherein, described optical splitter, delayer, the first auxiliary mirror and bundling device form the first light path; Described optical splitter, the second auxiliary mirror and bundling device form the second light path;
Described optical splitter, for beam splitting such as the laser that measured laser light source exports;
Described delayer, the light path for each road laser to beam splitting increases;
Described bundling device, for being merged by the laser of beam splitting, forms the laser after frequency multiplication.
10. pulse laser time-domain frequency doubling device as claimed in claim 9, it is characterized in that, described optical splitter is partially reflecting mirror; Described delayer is made up of photonic crystal fiber; Described bundling device is partially reflecting mirror.
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Cited By (7)
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| CN106451057A (en) * | 2016-11-30 | 2017-02-22 | 武汉光迅科技股份有限公司 | Low cost tunable laser with TO structure |
| CN107045207A (en) * | 2017-06-07 | 2017-08-15 | 中国科学院半导体研究所 | Train of pulse produces the structure controlled with time domain pattern |
| CN108226898A (en) * | 2018-01-15 | 2018-06-29 | 深圳市速腾聚创科技有限公司 | Laser radar and the method for improving laser radar launch point frequency |
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| CN112421359A (en) * | 2020-11-20 | 2021-02-26 | 杭州奕力科技有限公司 | All-fiber pulse frequency multiplier with low dispersion difference |
| CN113985695A (en) * | 2021-11-29 | 2022-01-28 | 深圳大学 | Framing delay structure and framing delay illumination structure |
| CN116053918A (en) * | 2022-12-12 | 2023-05-02 | 苏州贝林激光有限公司 | GHz high-frequency femtosecond laser pulse generating device and method |
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| CN116053918A (en) * | 2022-12-12 | 2023-05-02 | 苏州贝林激光有限公司 | GHz high-frequency femtosecond laser pulse generating device and method |
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Application publication date: 20150422 |