CN1588170A - Light pulse arbitary time shaping device - Google Patents
Light pulse arbitary time shaping device Download PDFInfo
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- CN1588170A CN1588170A CN 200410052914 CN200410052914A CN1588170A CN 1588170 A CN1588170 A CN 1588170A CN 200410052914 CN200410052914 CN 200410052914 CN 200410052914 A CN200410052914 A CN 200410052914A CN 1588170 A CN1588170 A CN 1588170A
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- convex lens
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- optic deflector
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- light pulse
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Abstract
The invention is an optical pulse shaping device in any time, it arranges beam optical splitter, the first convex lens, a small aperture diaphragm, the second convex lens, photoelectric deflector, the third convex lens, liquid crystal space optical modulator and the fourth convex lens, the first convex lens, the small aperture diaphragm and the second convex lens form a 4F system, the photoelectric deflector is on the front focusing surface of the third convex lens, the liquid crystal space optical modulator is connected to a computer; the reflecting direction of the beam splitter has a PIN tube, the PIN tube is connected to the high voltage ignition circuit of the photoelectric deflector; the focus of the fourth convex lens is relapsed with the input end of the simple module fiber, the output end of the simple module fiber is connected to strong flow pipe, the output end of the strong flow pipe is connected to oscillograph.
Description
Technical field
The present invention is relevant with nanosecond pulse, relates to a kind of optical pulse time apparatus for shaping, can realize the output of nanosecond arbitrary shape time shaping light pulse.
Background technology
Inertial confinement fusion requires the laser pulse of drive source output must have suitable pulse shape.Arbitrary shape time shaping export technique is a key of driver fore-end.At present the main method that adopts mainly contains: pulse is piled up, block Pockers cell high pressure slicing, integrated optics modulation etc.
1, (GEKKO_XII) piled up in pulse: this device uses the optical fiber pulse to pile up device with the light pulse of a plurality of unit pulse with the synthetic complicated shape of the mode of piling up.Though utilize the mode of combination very flexible, the unit is a lot, structure is also complicated, influence stability;
2, block Pockers cell high pressure slicing:
Adopt photoconductivity switching and non uniform transmission line to produce the high electric field pulse of complicated shape, obtain suitable shaping light pulse with this electric pulse controlling and driving Pockers cell then, this device needs high pressure and the pulse of generation complicated shape limited in one's ability; See J.K.Lawson, D.R.Speck, C.Bibeau, S.C.Burkhart, M.A.Henesian, C.W.Laumann, T.L.Weiland, and R.B.Wilcox, " Temporal shaping of third-harmonicpulses on the NOVA laser system; " Appl.Opt.31,5061 (1992).
3, integrated optics modulation:
Replace Pockers cell with integrated optical modulator, on the structure also more complicated and cost than higher.See B.M.Van Wonterghem, D.R.Speck, M.J.Norman, R.B.Wilcox, V.P.Karpenko, and J.B.Richards " Compact and Versatile pulse generation and shapingsubsystem for high-energy laser systems; " in Laser Coherence Control:Technology andApplications, H.T.Powell and T.J.Kessler, Eds., Proc.SPIE 1870,64 (1993).
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, and a kind of light pulse random time apparatus for shaping is provided, and the structural unit of this device should be simple, and cost is low, and operation is easy, can produce various complicated shape light pulses.
Basic thought of the present invention is: utilize and adopt four electrodes to mix magnesium LiNbO
3Electro-optic deflector utilizes its maximum electrooptical coefficient r
33, to obtain the most effective electrooptical deflection; Utilize the printing opacity ratio of each picture element on the computing machine pointwise control LCD space light modulator to distribute, the light beam of opening at spacescan is carried out shaping,, utilize single-mode fiber to realize beam recovery to obtain the light pulse output of arbitrary shape.
Technical solution of the present invention is:
A kind of light pulse random time apparatus for shaping, its feature structure is: establish beam splitter, first convex lens, aperture on the main shaft of king oscillator output beam successively, second convex lens, electro-optic deflector, the 3rd convex lens, LCD space light modulator, the 4th convex lens, and described first convex lens, aperture and second convex lens constitute a 4F system, electro-optic deflector is positioned on the front focal plane of the 3rd convex lens, and LCD space light modulator is positioned on the back focal plane of the 3rd convex lens, and this LCD space light modulator links to each other with a computing machine;
Described beam splitter and the placement at 45 of described main shaft have PIN pipe in the reflected light direction of this beam splitter, and this PIN pipe connects the high-voltage triggering circuit of electro-optic deflector;
The focus of described the 4th convex lens overlaps with the input end of single-mode fiber, the output termination high current pipe of this single-mode fiber, the output termination oscillograph of this high current pipe.
Described electro-optic deflector is that one or four electrodes are mixed magnesium LiNbO
3Electro-optic deflector.
Described the 4th convex lens are one 10 times microcobjective.
Technique effect of the present invention;
1, adopt four electrodes to mix magnesium LiNbO
3Electro-optic deflector utilizes its maximum electrooptical coefficient r
33, can obtain the structure of effective electrooptical deflection;
2,, each pixel unit on the LCD space light modulator is controlled in real time, can produce various complicated shape light pulses by computing machine;
3, utilize single-mode fiber (11) to realize beam recovery, this mode has been simplified the step of beam recovery greatly, has reduced cost, has improved stability;
4, with GEKKO_XII in corresponding pulse pile up the unit and compare with the optical pulse time apparatus for shaping of the integrated optics modulating device of Beamlet and NIF, want much simple on the structural unit of apparatus of the present invention, cost is also much lower, and adjusted is controlled very simple and convenience by computing machine;
5, each unit component of whole device is optical component commonly used, comparative maturity all on the technical matters, reliability height.
Description of drawings
Fig. 1 is the light path synoptic diagram of light pulse random time apparatus for shaping of the present invention
Fig. 2 is that four electrodes are mixed magnesium LiNbO in the light pulse random time apparatus for shaping of the present invention
3The structural representation of electro-optic deflector
Fig. 3 is the optical pulse waveform from the main frequency modulator output of shaking
Fig. 4, wherein A is the deflection voltage pulse that is added on the electro-optic deflector, B is the light pulse of sweep starting point position
Fig. 5 is the flat-top light pulse of the about 4ns of pulsewidth after apparatus of the present invention shaping
Fig. 6 is the steep light pulse in forward position of the about 4ns of pulsewidth after apparatus of the present invention shaping
Fig. 7 is the bimodal light pulse of the about 4ns of pulsewidth after apparatus of the present invention shaping
Fig. 8 is the steep light pulse in back edge of the about 4ns of pulsewidth after apparatus of the present invention shaping
Embodiment
See also Fig. 1 earlier, Fig. 1 is the light path synoptic diagram of light pulse random time apparatus for shaping of the present invention, as seen from the figure, light pulse random time apparatus for shaping of the present invention, its structure is: establish beam splitter 2 on the main shaft of king oscillator 1 output beam successively, first convex lens 4, aperture 5, second convex lens 6, electro-optic deflector 7, the 3rd convex lens 8, LCD space light modulator 9, the 4th convex lens 10, and described first convex lens 4, the aperture 5 and second convex lens 6 constitute a 4F system, electro-optic deflector 7 is positioned on the front focal plane of the 3rd convex lens 8, and LCD space light modulator 9 is positioned on the back focal plane of the 3rd convex lens 8, and this LCD space light modulator 9 links to each other with computing machine 15;
Described beam splitter 2 and the placement at 45 of described main shaft, in the reflected light direction of this beam splitter 2 model being arranged is PIN pipe 3, and this PIN pipe connects the high-voltage triggering circuit 14 of electro-optic deflector 7, and the output of this high-voltage triggering circuit 14 connects electro-optic deflector 7;
The focus of described the 4th convex lens 10 overlaps with the input end of single-mode fiber 11, the output termination high current pipe 12 of this single-mode fiber 11, the output termination oscillograph 13 of this high current pipe 12.
Described electro-optic deflector 7 is that one or four electrodes are mixed magnesium LiNbO
3Electro-optic deflector.
Described the 4th convex lens 10 are one 10 times microcobjective.
The groundwork process of apparatus of the present invention:
The light pulse that needs shaping is by after the king oscillator 1 output process beam splitter 2, and a part of light is reflected, and another part is by transmission, and folded light beam is converted to electric signal via PIN pipe 3 and removes to trigger the high-tension circuit 14 that drives deflector 7; Transmitted light is through a 4F system that is made of first convex lens 4, second convex lens 6 and aperture 5, improve beam quality after, transmitted light arrives the LiNbO of the front focal plane that is positioned at the 3rd convex lens 8
3Electro-optic deflector 7.Trigger the high-tension circuit 14 that drives electro-optic deflector 7 by adjusting, to regulate the time delay of triggering between electric pulse and the optical signal transmissive, transmitted light beam is deflected under the effect of synchronous high electric field pulse.Along with the increase that is added in voltage on the electro-optic deflector 7, transmitted light deflection also increases gradually, to be swept according to chronological order on the focal plane of the 3rd convex lens 8 be a line to laser pulse like this, just is converted into one section corresponding on the spatial domain upper tracer at each section on the time domain like this.
On the back focal plane of the 3rd convex lens 8, insert LCD space light modulator 9 (being called for short LCSLM), this LCSLM controls the voltage that is added in each picture element on the liquid crystal display by computing machine 15, can regulate by the light transmission rate that changes last each pixel of LCSLM through light distribution on the sweep trace.As light transmission LCSLM, focus on to be coupled in the long single-mode fiber 11 of a hop count rice through the 4th convex lens 10 then and restore, final output laser shaping pulse is that high current pipe 12 receives and write down demonstration by oscillograph 13
In the specific embodiment of the invention:
Adopt the Japanese Sharp LM64185P LCD of company as LCD space light modulator 9, for 1.053 μ m light, can make contrast surpass 30: 1 by the angle of regulating between the polaroid of LCD both sides, the information that control LCD goes up each pixel can be written in the driver module, to produce any reshaping pulse.
King oscillator 1 adopts Nd: YLF Q-adjusted single longitudinal mode king oscillator produces light pulse (wavelength 1.053 μ m, repetition frequency 1Hz).By the light pulse of king oscillator 1 output as shown in Figure 3, its output pulse shape is Gaussian, the about 85ns of pulse width;
The focal length of first convex lens 4 and second convex lens 6 is respectively 0.5m and 1m among Fig. 1, and the diameter of aperture 5 is 1mm;
The shape of electro-optic deflector 7 as shown in Figure 2, D=4mm, r=2mm, directions X is a horizontal direction among the figure, light beam along Y-axis perpendicular to the X-Z planar projective, Y direction LINbO
3Crystal length is 34mm.
Synchronous high electric field pulse shape such as Fig. 4 A curve, voltage has changed 5kV in 20ns; Regulate this voltage be added on the electro-optic deflector 7 triggering constantly, begin to be scanned out from its center by the light pulse in this electro-optic deflector 7, shown in Fig. 4 B curve, the light pulse latter half deflects under the effect that is added in voltage on the deflector 7;
The focal length of the 3rd convex lens 8 is 1m, electro-optic deflector 7 and LCD space light modulator 9 are respectively on focal plane before and after it, through the adjusting of LCD space light modulator 9, control the voltage that is added in each picture element by computing machine 15, can obtain the shaping light pulse of different shape.
Described the 4th convex lens 10 are microcobjectives of one 10 times, light beam coupling after process LCD space light modulator 9 shapings that scanning is opened is gone into one and is longer than in 1 meter the single-mode fiber 11, shaping light beam after the recovery is that high current pipe 12 is accepted, and shows on oscillograph 13.Its result is that wherein Fig. 5 is the flat-top light pulse through the light pulse signal of the different shape of the about 4ns of pulsewidth after apparatus of the present invention shaping shown in Fig. 5～protruding 8; Fig. 6 is the steep light pulse in forward position; Fig. 7 is bimodal light pulse; Fig. 8 is that the back is along steep light pulse.
Claims (3)
1, a kind of light pulse random time apparatus for shaping, the structure that it is characterized in that it is to establish beam splitter (2) on the main shaft of king oscillator (1) output beam successively, first convex lens (4), aperture (5), second convex lens (6), electro-optic deflector (7), the 3rd convex lens (8), LCD space light modulator (9) and the 4th convex lens (10), and described first convex lens (4), aperture (5) and second convex lens (6) constitute a 4F system, electro-optic deflector (7) is positioned on the front focal plane of the 3rd convex lens (8), and LCD space light modulator (9) is positioned on the back focal plane of the 3rd convex lens (8), and this LCD space light modulator (9) links to each other with computing machine (15); Described beam splitter (2) and the placement at 45 of described main shaft, reflected light direction at this beam splitter (2) has PIN pipe (3), this PIN pipe connects the high-voltage triggering circuit (14) of electro-optic deflector (7), and the output of this high-voltage triggering circuit (14) connects electro-optic deflector (7); The focus of described the 4th convex lens (10) overlaps with the input end of single-mode fiber (11), the output termination high current pipe (12) of this single-mode fiber (11), the output termination oscillograph (13) of this high current pipe (12).
2, light pulse random time apparatus for shaping according to claim 1 is characterized in that described electro-optic deflector (7) is that one or four electrodes are mixed magnesium LiNbO
3Electro-optic deflector.
3, light pulse random time apparatus for shaping according to claim 1 is characterized in that described the 4th convex lens (10) are one 10 times microcobjective.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052914 CN1256611C (en) | 2004-07-16 | 2004-07-16 | Light pulse arbitary time shaping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052914 CN1256611C (en) | 2004-07-16 | 2004-07-16 | Light pulse arbitary time shaping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588170A true CN1588170A (en) | 2005-03-02 |
| CN1256611C CN1256611C (en) | 2006-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410052914 Expired - Fee Related CN1256611C (en) | 2004-07-16 | 2004-07-16 | Light pulse arbitary time shaping device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103705222A (en) * | 2014-01-17 | 2014-04-09 | 上海理工大学 | Tissue water content real-time measuring device based on electrocoagulation closer |
| CN103984184B (en) * | 2014-05-19 | 2016-08-24 | 上海交通大学 | Light pulse compressive reflexes device |
| CN107807363A (en) * | 2017-12-13 | 2018-03-16 | 中国科学院上海天文台 | The laser echo signal signal to noise ratio intensifier and Enhancement Method of a kind of laser ranging |
-
2004
- 2004-07-16 CN CN 200410052914 patent/CN1256611C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103705222A (en) * | 2014-01-17 | 2014-04-09 | 上海理工大学 | Tissue water content real-time measuring device based on electrocoagulation closer |
| CN103984184B (en) * | 2014-05-19 | 2016-08-24 | 上海交通大学 | Light pulse compressive reflexes device |
| CN107807363A (en) * | 2017-12-13 | 2018-03-16 | 中国科学院上海天文台 | The laser echo signal signal to noise ratio intensifier and Enhancement Method of a kind of laser ranging |
| CN107807363B (en) * | 2017-12-13 | 2021-01-01 | 中国科学院上海天文台 | Laser echo signal-to-noise ratio enhancing device and enhancing method for laser ranging |
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| Publication number | Publication date |
|---|---|
| CN1256611C (en) | 2006-05-17 |
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