CN103712688B - High-power ultra-short laser real-time near field intensity distribution measuring device - Google Patents
High-power ultra-short laser real-time near field intensity distribution measuring device Download PDFInfo
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- CN103712688B CN103712688B CN201410007184.4A CN201410007184A CN103712688B CN 103712688 B CN103712688 B CN 103712688B CN 201410007184 A CN201410007184 A CN 201410007184A CN 103712688 B CN103712688 B CN 103712688B
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Abstract
The invention provides a high-power ultra-short laser real-time near field intensity distribution measuring device. An attenuating piece and a beam splitter are sequentially placed in the device in the incidence direction of high-power laser pulses. A micro-lens array, an optical fiber distributor, a delay optical fiber set, an optical fiber beam combiner, transmission optical fibers, a quick phototube and a high-speed oscilloscope are sequentially placed in the transmission direction of the beam splitter. An optical fiber clamping device and reference optical fibers are sequentially placed in the reflecting direction of the beam splitter. The delay optical fiber set and the reference optical fibers are connected to the optical fiber beam combiner to form single output, then the single output is projected to the quick phototube through the transmission optical fibers, electric pulse sequences are formed on the high-speed oscilloscope, and at last, a computer is used for conducting data processing. According to the high-power ultra-short laser real-time near field intensity distribution measuring device, the micro-lens array is used for conducting spatial splitting sampling and optical fiber beam combining time division multiplexing transmission, and various kinds of information such as incident laser beam real-time near field intensity distribution information and pulse time waveform information are obtained through the waveform splicing reconstruction technology. The high-power ultra-short laser real-time near field intensity distribution measuring device is low in cost, simple in structure and convenient to adjust.
Description
Technical field
The invention belongs to high-power laser test technical field, be specifically related to a kind of high power ultrashort laser real-time near-field intensity distribution measurement device.
Background technology
The near-field intensity distribution of laser beam and burst length waveform are the important indicators evaluating laser activity, in the Strong-field physics experiment under ultrashort laser effect, need to understand the laser near-field intensity distributions of any instant and the pulse waveform in arbitrary space in real time.There is time-resolved near field measurement at present and mainly adopt framing camera or streak camera, adopt framing camera can obtain the laser near-field intensity distributions of discrete instants, burst length shape information can not be obtained; And adopt streak camera can obtain the burst length shape information of the one-dimensional space, two-dimensional space strength distributing information can not be obtained.Name is called that the Chinese invention patent (patent No. ZL 201110325757) of " full light solid streak camera " discloses a kind of burst length waveform meter obtaining the one-dimensional space, name is called that the Chinese utility model patent (patent No. ZL201210579403) of " the high time resolution three-D imaging method based on framing camera " discloses one and utilizes framing camera to obtain two dimensional image, obtains the formation method of the target to be measured with 3D vision effect through three-dimensional reconstruction.The relevant report simultaneously obtaining the laser near-field intensity distributions of any instant and the burst length waveform testing in arbitrary space is not seen in current domestic existing patent.
Summary of the invention
The deficiency of the laser near-field intensity distributions of any instant and the burst length waveform in arbitrary space can not be obtained to overcome existing measuring technique simultaneously, the invention provides a kind of high power ultrashort laser real-time near-field intensity distribution measurement device.
The technical solution adopted for the present invention to solve the technical problems is:
High power ultrashort laser real-time near-field intensity distribution measurement device of the present invention, is characterized in, in described measurement mechanism, high-power laser pulse incident direction is disposed with attenuator, beam splitter; Laser pulse is divided into transmitted light and reflected light by described beam splitter, the transmitted light path of beam splitter is disposed with dimpling lens arra, fiber divider, delay optical fiber group, the reflected light path of beam splitter is disposed with convex lens, fibre holder, reference optical fiber; Described transmitted light postpones optical fiber group by entering after dimpling lens arra, fiber divider, and described reflected light planoconvex lens enters reference optical fiber by fibre holder after focusing on; Described reference optical fiber enters optical-fiber bundling device concurrently with delay optical fiber group; Transmission Fibers, fast light fulgurite, high-speed oscilloscope is set gradually after described optical-fiber bundling device; The light transmitted by reference optical fiber and delay optical fiber group is also advanced into optical-fiber bundling device, the light pulse sequence that the single output formed by optical-fiber bundling device is exported by Transmission Fibers carries out opto-electronic conversion through fast light fulgurite, be transferred on high-speed oscilloscope through signal cable and obtain electrical pulse sequence, be sent to computing machine finally by netting twine and carry out data processing, obtain incoming laser beam real-time near-field strength distributing information.
Described delay optical fiber group, Transmission Fibers, reference optical fiber optical fiber used is the single-mode fiber of same model.Laser pulse for different wave length, different pulse width selects the single-mode fiber of different centre wavelength, different length spacing.
Dimpling lens in described dimpling lens arra be set to concentric arrays, or matrix arrangement; Dimpling number of lenses can increase and decrease as required.
The invention has the beneficial effects as follows, measurement mechanism cost of the present invention is low, structure is simple, easy to adjust, dimpling lens arra is adopted to carry out segmentation sampling and the time-multiplexed transmission of optical-fiber bundling to laser beam near-field space, by waveform concatenation reconfiguration technique, instantaneous spatial power Density Distribution, the burst length distributed wave of sample space, full light beam pulse time waveform distribution can be obtained, the multi-aspect information of the laser beam such as full near-field beam intensity distributions.
Accompanying drawing explanation
Fig. 1 is the light channel structure schematic diagram for high power ultrashort laser real-time near-field intensity distribution measurement device of the present invention;
Fig. 2 is the dimpling lens arra arrangement schematic diagram in the present invention;
Fig. 3 is the N × M+1(N=6, M=6 that high speed oscillograph of the present invention obtains) individual pulse signal arrangement schematic diagram;
Fig. 4 is the pulse signal segmentation figure of Fig. 3;
In figure, 1. attenuator 2. beam splitter 3. dimpling lens arra 4. beam splitter 5. postpones optical fiber group 6. convex lens 7. fibre holder 8. reference optical fiber 9. optical-fiber bundling device 10. Transmission Fibers 11. fast light fulgurite 12. signal cable 13. high-speed oscilloscope 14. netting twine 15. computing machine.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described, but should not limit the scope of the invention with this.
Embodiment 1
Fig. 1 is the light channel structure schematic diagram for high power ultrashort laser real-time near-field intensity distribution measurement device of the present invention.In FIG, high power ultrashort laser real-time near-field intensity distribution measurement device of the present invention, in described measurement mechanism, high-power laser pulse incident direction is disposed with attenuator 1, beam splitter 2; Laser pulse is divided into transmitted light and reflected light by described beam splitter 2, the transmitted light path of beam splitter 2 is disposed with dimpling lens arra 3, fiber divider 4, postpones optical fiber group 5, the reflected light path of beam splitter 2 is disposed with convex lens 6, fibre holder 7, reference optical fiber 8; Described transmitted light postpones optical fiber group 5 by entering after dimpling lens arra 3, fiber divider 4, and described reflected light planoconvex lens 6 enters reference optical fiber 8 by fibre holder 7 after focusing on; Described reference optical fiber 8 enters optical-fiber bundling device 9 concurrently with delay optical fiber group 5; Transmission Fibers 10, fast light fulgurite 11, high-speed oscilloscope 13 is set gradually after described optical-fiber bundling device 9; The light transmitted by reference optical fiber 8 and delay optical fiber group 5 is also advanced into optical-fiber bundling device 9, the light pulse sequence that the single output formed by optical-fiber bundling device 9 is exported by Transmission Fibers 10 carries out opto-electronic conversion through fast light fulgurite 11, be transferred on high-speed oscilloscope 13 through signal cable 12 and obtain electrical pulse sequence, be sent to computing machine 15 finally by netting twine 14 and carry out data processing, obtain incoming laser beam real-time near-field strength distributing information.
Described delay optical fiber group 5, Transmission Fibers 10, reference optical fiber 8 optical fiber used is the single-mode fiber of same model.Laser pulse for different wave length, different pulse width selects the single-mode fiber of different centre wavelength, different length spacing.
Dimpling lens in described dimpling lens arra 3 be set to concentric arrays, or matrix arrangement; Dimpling number of lenses can increase and decrease as required.
In the apparatus of the present, after dimpling lens arra 3, the convergent beam of the capable M row of N is become from the directional light of beam splitter 2 transmission, through fiber divider 4, the delay optical fiber group 5 that described N × M dot projection forms to the optical fiber of N × M root different length is carried out different time delays, then described delay optical fiber group 5 is connected to optical-fiber bundling device 9 with reference optical fiber 8 and forms single output, project on fast light fulgurite 11 through Transmission Fibers 10 and carry out opto-electronic conversion, high-speed oscilloscope 13 is formed N × M+1 electrical pulse sequence, data processing is carried out finally by computing machine 15.
The data processing utilizing measurement mechanism of the present invention to measure laser real-time near-field intensity distributions comprises the following steps:
1. first calibrate.Pulse width is less than 10 psecs, beam modulation near field degree is less than 1.2, the laser pulse that near field contrast is less than 0.06 is input to this device, the position of the fiber divider 4 described in adjustment, ensure to drop on the respective input face of delay optical fiber group 5 from N × M focus of dimpling lens arra 3, adjustment postpones the length allocation of optical fiber, output pulse is made to number the Sequential output with Row Column by the dimpling lens arra 3 shown in Fig. 2, (i in Fig. 2, j) the dimpling lens position coordinate of the i-th row jth row is represented: be first the time reference pulse from reference optical fiber, then by number (1, 1), (1, 2), (1, M), (2, 1), (i, j) ... Sequential output, specifically see Fig. 2, Fig. 3.In Fig. 3, first pulse is time reference pulse, and (i, j) represents the burst length waveform that the dimpling lens position coordinate of the i-th row jth row is corresponding, N × M pulse waveform is obtained like this, i.e. the burst length distribution of incident beam space zones of different after time reference pulse:
g（i，j，t） i＝1、2、……N, j＝1、2、……M； （1）
Record peak strength and the position of all N × M+1 pulse, with the peak of time reference pulse for time reference, determine to be numbered the time delay of pulsion phase for time reference pulse of (i, j):
t
0（i，j） i＝1、2、……N, j＝1、2、……M； （2）
The intensity calibration amount of ratio as this pulse of the peak strength of the pulse of (i, j) and the peak strength of time reference pulse will be numbered:
g
0（i，j，t
0（i，j）） i＝1、2、……N, j＝1、2、……M； （3）
2. pulse train is divided into single pulse.With t
0(i, j), as unified time reference, re-establishes the time m-intensity distribution of N × M pulse, as shown in Figure 4, in Fig. 4, (i, j) represents the burst length waveform that the dimpling lens position coordinate of the i-th row jth row is corresponding, abscissa representing time, ordinate represents relative intensity;
3. N × M the pulse re-established time m-intensity distribution on get any instant t be numbered (i, j) pulse instantaneous value, remove the calibrator quantity of the corresponding numbering that (3) with the formula provide, the incident laser near field that can obtain this moment is numbered (i, the versus power density distribution of position j), i.e. transient laser near-field intensity distribution:
G（i,j,t）=g（i，j，t）/g
0（i，j，t
0（i，j））； （4）
4. time integral is carried out in the pulse pair being numbered (i, j), can obtain the pulse near field intensity of position incident laser near field being numbered (i, j), i.e. laser near-field intensity distributions:
（5）
5. pair all signal pulses carry out amplitude superposition, obtain the unified time waveform of incident laser:
（6）
In the present embodiment, incident laser pulse wavelength is 1064nm, and pulse width is about 5ns, and energy is about 10mJ, and spot diameter is 1cm.Fig. 2 is that dimpling lens arra 3 in the present invention is arranged schematic diagram.(i in Fig. 2, j) the dimpling lens position coordinate of the i-th row jth row is represented, here N=6 in (1) formula, M=6, totally 36 dimpling lens, produce 36 focuses, beam splitter 4 is placed at described 36 focus places, described beam splitter 4 introduces corresponding single mode delay optical fiber in delay optical fiber group 5 by often restrainting light, described delay fiber lengths presses Row Column sequentially, incremental change is 10 meters, numbering (1, 1) delay fiber lengths gets 15 meters, numbering (1, 2) delay fiber lengths gets 25 meters, the rest may be inferred, numbering (i, the length of delay optical fiber j) is (N × (i-1)+j-1) × 10+15 rice.
In the present invention, first the pulse signal of 1064nm is decayed through attenuator 1, light beam after decay is divided into transmitted light and reflected light through beam splitter 2, the energy Ratios of transmitted light and reflected light is 50:1, described reflected light planoconvex lens 6 focuses on the single mode reference optical fiber 8 entering 5 meters long, described transmitted light passes through the dimpling lens arra 3 of 6 × 6 from being spatially divided into 6 × 6 regions, enter 6 × 6 length by the focusing of described dimpling lens arra 3 and carry out different time delays by the single modes delay optical fiber group 5 that 10 meters increase progressively, complete the time division to light beam, then described delay optical fiber group 5 is entered optical-fiber bundling device 9 concurrently with reference optical fiber 8 and form single output, complete channel multiplexing, project on fast light fulgurite 11 through Transmission Fibers 10 and carry out opto-electronic conversion, high-speed oscilloscope 13 forms 6 × 6+1 electrical pulse sequence, data processing is carried out finally by computing machine 15, obtain real time laser near-field intensity distribution.
Embodiment 2
The present embodiment is identical with the light channel structure of embodiment 1, and data handling procedure is identical, and difference is, the concentric circles that is set to of the dimpling lens in described dimpling lens arra is arranged.I in numbering (i, j) represents the annulus sequence number by counting from inside to outside, and j represents the dimpling lens number on i-th annulus.
Claims (3)
1. a high power ultrashort laser real-time near-field intensity distribution measurement device, is characterized in that: in described measurement mechanism, and high-power laser pulse incident direction is disposed with attenuator (1), beam splitter (2); Laser pulse is divided into transmitted light and reflected light by described beam splitter (2), the transmitted light path of beam splitter (2) is disposed with dimpling lens arra (3), fiber divider (4), postpones optical fiber group (5), the reflected light path of beam splitter (2) is disposed with convex lens (6), fibre holder (7), reference optical fiber (8); Described transmitted light postpones optical fiber group (5) by entering after dimpling lens arra (3), fiber divider (4), enters reference optical fiber (8) after described reflected light planoconvex lens (6) focuses on by fibre holder (7); Described reference optical fiber (8) enters optical-fiber bundling device (9) concurrently with delay optical fiber group (5), sets gradually Transmission Fibers (10), fast light fulgurite (11), high-speed oscilloscope (13) after described optical-fiber bundling device (9); The light transmitted by reference optical fiber (8) and delay optical fiber group (5) is also advanced into optical-fiber bundling device (9), the light pulse sequence that the single output formed by optical-fiber bundling device (9) is exported by Transmission Fibers (10) carries out opto-electronic conversion through fast light fulgurite (11), be transferred on high-speed oscilloscope (13) through signal cable (12) and obtain electrical pulse sequence, be sent to computing machine (15) finally by netting twine (14) and carry out data processing, obtain incoming laser beam real-time near-field strength distributing information.
2. high power ultrashort laser real-time near-field intensity distribution measurement device according to claim 1, is characterized in that: the optical fiber that described delay optical fiber group (5), Transmission Fibers (10), reference optical fiber (8) adopt is the single-mode fiber of same model.
3. high power ultrashort laser real-time near-field intensity distribution measurement device according to claim 1, is characterized in that: the dimpling lens in described dimpling lens arra (3) be set to concentric arrays or matrix arrangement.
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| US6366356B1 (en) * | 1999-04-01 | 2002-04-02 | Trw Inc. | High average power fiber laser system with high-speed, parallel wavefront sensor |
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