CN103712688A - 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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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 the real-time near-field intensity distribution measurement mechanism of a kind of high power ultrashort laser.
Background technology
The near-field intensity distribution of laser beam and burst length waveform are the important indicators of evaluating laser activity, in the high field Physical Experiment under ultrashort laser effect, need to understand in real time the laser near-field intensity distributions in arbitrary moment and the pulse waveform in arbitrary space.There is at present time-resolved near field measurement and mainly adopt framing camera or streak camera, adopt framing camera can obtain the laser near-field intensity distributions in the discrete moment, can not obtain burst length shape information; And adopt streak camera can obtain the burst length shape information of the one-dimensional space, can not obtain two-dimensional space strength distributing information.The Chinese invention patent (patent No. ZL 201110325757) that name is called the full light solid streak camera of < < > > discloses a kind of burst length waveform meter that obtains the one-dimensional space, the Chinese utility model patent (patent No. ZL201210579403) that name is called the high time resolution three-D imaging method > > of < < based on framing camera discloses a kind of framing camera that utilizes and has obtained two dimensional image, through three-dimensional reconstruction, obtain having the formation method of the target to be measured of 3D vision effect.In domestic existing patent, do not see the relevant report that simultaneously obtains the laser near-field intensity distributions in arbitrary moment and the burst length waveform testing in arbitrary space at present.
Summary of the invention
In order to overcome existing measuring technique, can not obtain the deficiency of the laser near-field intensity distributions in arbitrary moment and the burst length waveform in arbitrary space simultaneously, the invention provides the real-time near-field intensity distribution measurement mechanism of a kind of high power ultrashort laser.
The technical solution adopted for the present invention to solve the technical problems is:
The real-time near-field intensity distribution measurement mechanism of high power ultrashort laser of the present invention, is characterized in, in described measurement mechanism, is disposed with attenuator, beam splitter in high-power laser pulse incident direction; Laser pulse is divided into transmitted light and reflected light by described beam splitter, on the transmitted light path of beam splitter, be disposed with dimpling lens arra, fiber distribution device, postpone optical fiber group, on the reflected light path of beam splitter, be disposed with convex lens, fibre holder, reference optical fiber; Described transmitted light enters after by dimpling lens arra, fiber distribution device and postpones optical fiber group, 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; After described optical-fiber bundling device, set gradually Transmission Fibers, fast light fulgurite, high-speed oscilloscope; The light being 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 being formed by optical-fiber bundling device is exported by Transmission Fibers carries out opto-electronic conversion through fast light fulgurite, through signal cable, be transferred to and on high-speed oscilloscope, obtain electrical pulse sequence, finally by netting twine, be sent to computing machine and carry out data processing, obtain the real-time near-field intensity distribution information of incoming laser beam.
The single-mode fiber that described delay optical fiber group, Transmission Fibers, reference optical fiber optical fiber used is same model.For the laser pulse of different wave length, different pulse widths, select the single-mode fiber of different centre wavelength, different length spacing.
The concentric circles that is set to of the dimpling lens in described dimpling lens arra is arranged, or matrix form is arranged; Dimpling lens number can increase and decrease as required.
The invention has the beneficial effects as follows, measurement mechanism cost of the present invention is low, simple in structure, easy to adjust, adopt dimpling lens arra to cut apart sampling and the time-multiplexed transmission of optical-fiber bundling to space, laser beam near field, by waveform concatenation reconfiguration technique, can obtain the burst length distributed wave of instantaneous spatial power Density Distribution, sample space, full light beam pulse time waveform distribution, 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 the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser of the present invention;
Fig. 2 is the schematic diagram of arranging of the dimpling lens arra in the present invention;
Fig. 3 is the N that obtains of high speed oscillograph of the present invention * M+1(N=6, M=6) the individual pulse signal schematic diagram of arranging;
Fig. 4 is that the pulse signal of Fig. 3 is cut apart figure;
In figure, 1. attenuator 2. beam splitter 3. dimpling lens arra 4. beam splitters 5. postpone 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 machines.
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 the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser of the present invention.In Fig. 1, the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser of the present invention in described measurement mechanism, is disposed with attenuator 1, beam splitter 2 in high-power laser pulse incident direction; Laser pulse is divided into transmitted light and reflected light by described beam splitter 2, on the transmitted light path of beam splitter 2, be disposed with dimpling lens arra 3, fiber distribution device 4, postpone optical fiber group 5, on the reflected light path of beam splitter 2, be disposed with convex lens 6, fibre holder 7, reference optical fiber 8; Described transmitted light enters after by dimpling lens arra 3, fiber distribution device 4 and postpones optical fiber group 5, after described reflected light planoconvex lens 6 focuses on, by fibre holder 7, enters reference optical fiber 8; Described reference optical fiber 8 enters optical-fiber bundling device 9 concurrently with delay optical fiber group 5; After described optical-fiber bundling device 9, set gradually Transmission Fibers 10, fast light fulgurite 11, high-speed oscilloscope 13; The light being 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 being formed by optical-fiber bundling device 9 is exported by Transmission Fibers 10 carries out opto-electronic conversion through fast light fulgurite 11, through signal cable 12, be transferred on high-speed oscilloscope 13 and obtain electrical pulse sequence, finally by netting twine 14, be sent to computing machine 15 and carry out data processing, obtain the real-time near-field intensity distribution information of incoming laser beam.
The single-mode fiber that described delay optical fiber group 5, Transmission Fibers 10, reference optical fiber 8 optical fiber used is same model.For the laser pulse of different wave length, different pulse widths, select the single-mode fiber of different centre wavelength, different length spacing.
The concentric circles that is set to of the dimpling lens in described dimpling lens arra 3 is arranged, or matrix form is arranged; Dimpling lens number can increase and decrease as required.
In device of the present invention, from the directional light of beam splitter 2 transmissions, after dimpling lens arra 3, become the convergent beam that the capable M of N is listed as, through fiber distribution device 4, described N * M dot projection is carried out to different time delays to the delay optical fiber group 5 of the optical fiber composition of N * M root different length, then described delay optical fiber group 5 and reference optical fiber 8 are connected to optical-fiber bundling device 9 and form single output, through Transmission Fibers 10, project and on fast light fulgurite 11, carry out opto-electronic conversion, on high-speed oscilloscope 13, form N * M+1 electrical pulse sequence, finally by computing machine 15, carry out data processing.
The data processing of utilizing measurement mechanism of the present invention to measure the real-time near-field intensity distribution of laser comprises the following steps:
1. first calibrate.Pulse width is less than to 10 psecs, beam modulation near field degree is less than 1.2, near field contrast is less than 0.06 laser pulse and is input to this device, adjust the position of described fiber distribution device 4, assurance drops on the respective input face that postpones optical fiber group 5 from N * M focus of dimpling lens arra 3, adjust the length allocation that postpones optical fiber, make to export the Sequential output that pulse is numbered with Row Column by the dimpling lens arra 3 shown in Fig. 2, (i in Fig. 2, j) represent the dimpling lens position coordinate of the capable j row of i: 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 referring to Fig. 2, Fig. 3.In Fig. 3, first pulse is time reference pulse, and (i, j) represents the burst length waveform corresponding to dimpling lens position coordinate of the capable j row of i, after time reference pulse, obtain like this N * M pulse waveform, the burst length of incident beam space zones of different distributes:
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, the peak of time reference pulse of take is time reference, determines and is numbered the pulsion phase of (i, j) for the time delay of time reference pulse:
t
0（i，j） i＝1、2、……N, j＝1、2、……M； （2）
To be numbered the peak strength of pulse of (i, j) and the ratio of the peak strength of time reference pulse as the intensity calibration amount of this pulse:
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 burst length waveform corresponding to dimpling lens position coordinate that the capable j of i is listed as, horizontal ordinate represents the time, and ordinate represents relative intensity;
The N * M a re-establishing pulse time get the (i that is numbered of arbitrary moment t on m-intensity distribution, j) pulse instantaneous value, the calibrator quantity of the corresponding numbering providing divided by formula (3), can obtain on the incident laser near field in this moment and be numbered (i, the relative power Density Distribution of position j), i.e. instantaneous laser near-field intensity distributions:
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 that pair is numbered (i, j), can obtain the pulse near field intensity of the position that is numbered (i, j) on incident laser near field, i.e. laser near-field intensity distributions:
（5）
5. pair all signal pulses carry out amplitude stack, 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 the schematic diagram of arranging of the dimpling lens arra 3 in the present invention.(i in Fig. 2, j) represent the dimpling lens position coordinate of the capable j row of i, here N=6 in (1) formula, M=6, totally 36 dimpling lens, produce 36 focuses, at 36 described focus places, place beam splitter 4, described beam splitter 4 is introduced every bundle light into the interior corresponding single mode of delay optical fiber group 5 and is postponed optical fiber, described delay fiber lengths increases progressively by Row Column order, incremental change is 10 meters, numbering (1, 1) delay fiber lengths is got 15 meters, numbering (1, 2) delay fiber lengths is got 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, transmitted light and catoptrical energy Ratios are 50:1, described reflected light planoconvex lens 6 focuses on the single mode reference optical fiber 8 that enters 5 meters long, described transmitted light is divided into 6 * 6 regions by 6 * 6 dimpling lens arra 3 from space, by 3 focusing of described dimpling lens arra, enter 6 * 6 length and carry out different time delays by 10 meters of single modes delay optical fiber groups 5 that increase progressively, complete the time division to light beam, then described delay optical fiber group 5 and reference optical fiber 8 are entered concurrently to optical-fiber bundling device 9 and form single output, complete channel multiplexing, through Transmission Fibers 10, project and on fast light fulgurite 11, carry out opto-electronic conversion, on high-speed oscilloscope 13, form 6 * 6+1 electrical pulse sequence, finally by computing machine 15, carry out data processing, obtain real-time laser near-field intensity distributions.
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 dimpling lens in described dimpling lens arra be set to concentric circles setting.I in numbering (i, j) represents the annulus sequence number of counting by from inside to outside, and j represents i the dimpling lens numbering on annulus.
Claims (3)
1. the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser, is characterized in that: in described measurement mechanism, be disposed with attenuator (1), beam splitter (2) in high-power laser pulse incident direction; Laser pulse is divided into transmitted light and reflected light by described beam splitter (2), on the transmitted light path of beam splitter (2), be disposed with dimpling lens arra (3), fiber distribution device (4), postpone optical fiber group (5), on the reflected light path of beam splitter (2), be disposed with convex lens (6), fibre holder (7), reference optical fiber (8); Described transmitted light enters after by dimpling lens arra (3), fiber distribution device (4) and postpones optical fiber group (5), 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 postponing 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 being transmitted by reference optical fiber (8) and delay optical fiber group (5) is also advanced into optical-fiber bundling device (9), the single output being formed by optical-fiber bundling device (9) is carried out opto-electronic conversion by the light pulse sequence of Transmission Fibers (10) output through fast light fulgurite (11), through signal cable (12), be transferred to the upper electrical pulse sequence that obtains of high-speed oscilloscope (13), finally by netting twine (14), be sent to computing machine (15) and carry out data processing, obtain the real-time near-field intensity distribution information of incoming laser beam.
2. the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser according to claim 1, is characterized in that: the single-mode fiber that the optical fiber that described delay optical fiber group (5), Transmission Fibers (10), reference optical fiber (8) adopt is same model.
3. the real-time near-field intensity distribution measurement mechanism of high power ultrashort laser according to claim 1, is characterized in that: the dimpling lens in described dimpling lens arra (3) be set to that concentric circles is arranged or matrix form is arranged.
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