CN100504566C - Chirp impulse compression method and device - Google Patents
Chirp impulse compression method and device Download PDFInfo
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- CN100504566C CN100504566C CNB2006100762551A CN200610076255A CN100504566C CN 100504566 C CN100504566 C CN 100504566C CN B2006100762551 A CNB2006100762551 A CN B2006100762551A CN 200610076255 A CN200610076255 A CN 200610076255A CN 100504566 C CN100504566 C CN 100504566C
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- chirped pulse
- pulse
- plasma
- chirped
- laser
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Abstract
The invention discloses a chirp pulse compression method and a relative device, based on plasma, wherein the method comprises that (1), providing a section of plasma, (2), providing a first chirp pulse incident into the plasma, (3), providing a second chirp pulse incident into the plasma, (4), emitting the object chirp laser pulse along the direction same as the first chirp pulse into the plasma. And the device comprises a laser for emitting a laser chirp pulse, a light splitter for splitting the laser chirp pulse into two beams, while one beam via a split delay device is divided into a first chirp pulse an a third chirp pulse, and another beam via a pulse compressor forms a second non-chirp pulse, the first and the second chirp pulses are emitted to a plasma generated by a plasma generator, the second non-chirp pulse is reversed emitted into the plasma. The invention has high pulse compression efficiency and high light intensity damage threshold value.
Description
Technical field
The present invention relates to a kind of impulse compression method and device, particularly a kind of chirp impulse compression method and device that utilizes plasma.
Background technology
Since having invented first laser instrument the sixties in last century, laser instrument is not only a kind of strong scientific research instrument of knowledge of natural environment essence, and affects people's work and life in every field, for example medical treatment, little manufacture field etc.Along with the development and the variation of laser instrument self, its value will have performance more fully.
The light laser technology is exactly the most important developing direction of present laser field.The topmost power of development high intensity laser is laser fusion, and the DT target ball of radiation compression that utilizes multiple laser to produce is exactly realized nuclear reaction.Laser fusion is expected to provide the nexhaustible energy for the mankind.Countries in the world comprise Chinese hundred million the high-power super large laser instrument of fund construction short pulse separately that all costed in construction.1994, people such as the Tabak of U.S. Livemore National Laboratory proposed a kind of novel fusion scheme, were called for short fast ignition, realized the needed driving laser energy of fusion though this novel fusion scheme reduces, and needed to adopt the short-pulse laser of ultra high power.
In the prior art, the high-power super large laser instrument of short pulse all is based on the chirped pulse amplification of the American Mourou invention eighties.The basic technical scheme of chirped pulse amplification is: an initial low-energy short laser pulse, earlier obtain broadening by a pair of diffraction grating, then in optical crystal, obtain amplifying, and then by a pair of diffraction grating obtain the compression, export a high-power laser pulse of short pulse at last.As seen, the diffraction grating that plays compression at output terminal will meet with very strong laser.The damage threshold of these diffraction grating is one of limiting factors of the more high-power laser pulse of restriction generation, that is to say that the more high-power laser of generation need have the more diffraction grating of high damage threshold.
No matter be the diffraction grating that metal or insulation dielectric manufacturing form generally, its damage threshold is only at several joules/centimetres
2Magnitude, limited producing more high-power laser pulse.
In the prior art, the chirped mirror that the normal transparent insulating material is made as shown in Figure 1, is that the transparent dielectric layer by two kinds of different refractivities alternately is formed by stacking, as high index of refraction n
1Material TiO
2,, low-refraction n
2Material SiO
2, and the uneven a kind of dielectric mirror of space periodic.According to Prague principle, in the periodicity layer structure that a space periodic is d, and at this moment light will be claimed that incident light satisfies Bragg condition perpendicular to layer structure (along the cycle direction) incident by total reflection when light wavelength equals 2d.Obviously, in the chirped mirror that a space periodic changes, the light of the different frequency in the incident light pulse (light pulse always has certain spectrum width) can be reflected because of satisfying Bragg condition different positions in chirped mirror.In chirped mirror shown in Figure 1, the incident pulse incident from left to right that nothing is warbled, the light field component of high frequency (short wavelength) is earlier in left end (space periodic the is little) reflection of chirped mirror, and the light field of low frequency (long wavelength) component will propagate into the right-hand member (space periodic is big) of chirped mirror and just is reflected.Because the light of different frequency is reflected in different positions, feasible only broadened chirped pulse that frequency changed along with the time that finally reflects.The pulse front edge that chirped mirror shown in Figure 1 reflects is a radio-frequency component, and the back is along being low-frequency component, and this just is negative chirped pulse.In a word, the pulse that nothing is warbled is incided in the chirped mirror of Fig. 1, reflects the negative chirped pulse of a broadening.That is to say that such chirped mirror presents negative dispersion (negative dispersion causes negative warbling).Negative dispersion can be used for compressing a positive chirped pulse (forward position low frequency, the back is along high frequency).When positive chirped pulse of incident from left to right during to the chirped mirror of Fig. 1, reflecting is exactly a no chirped pulse that the low-and high-frequency light after the compression spatially overlaps.
But the deficiency of chirped mirror of the prior art is that its damage threshold is only at several joules/centimetres
2Magnitude, limited producing more high-power laser pulse.Therefore, people wish to have a kind of chirped mirror with high light intensity damage threshold, this chirped mirror are used in the chirped pulse amplification of high intensity laser, can improve laser power greatly.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of chirp impulse compression method and device with high light intensity damage threshold is provided.
In order to achieve the above object, the present invention takes following technical scheme.
A kind of chirp impulse compression method comprises the steps:
1) provides one section plasma;
2) provide first chirped pulse to incide described plasma;
3) provide the second no chirped pulse along oppositely inciding described plasma;
4) chirped laser pulse to be compressed is incided described plasma along the direction identical with described first chirped pulse.
In technique scheme, the density range of described plasma is 0.01-0.5N
C, N wherein
CIt is critical plasma density.
In technique scheme, the pulsewidth of described first chirped pulse is greater than the pulsewidth of the described second no chirped pulse.
In technique scheme, the pulsewidth scope of described first chirped pulse is 100 femtoseconds-5 psecs; The pulsewidth scope of the described second no chirped pulse is 20 femtoseconds-500 femtoseconds.
In technique scheme, described laser pulse to be compressed falls behind 200-300 photoperiods than described first chirped pulse, just falls behind the 0.5-1 psec and incides described plasma.
A kind of chirped pulse compression set comprises:
One laser instrument 10 sends laser chirped pulse 0;
One optical splitter 11 is divided into two bundles with described laser chirped pulse 0, wherein a branch ofly is divided into first chirped pulse 1 and the 3rd chirped pulse 3 through a beam splitting time-delay mechanism 4, and another bundle forms the second no chirped pulses 2 through a pulse shortener 5 backs; Described first chirped pulse 1 and the 3rd chirped pulse 3 incide the plasma that is produced by a plasma maker 6, and the described second no chirped pulse 2 is along oppositely inciding described plasma.
In technique scheme, this device also comprises first catoptron 12 between described optical splitter 11 and the described pulse shortener 5, and second catoptron 13 and the 3rd catoptron 14 are arranged between described pulse shortener 5 and the described plasma generator capable 6.
In technique scheme, the density range of described plasma is 0.01-0.5N
C, wherein be N
CIt is critical plasma density.
In technique scheme, the pulsewidth of first chirped pulse 1 that described beam splitting time-delay mechanism 4 produces is greater than the pulsewidth of the described second no chirped pulse 2 of described pulse shortener 5 formation.
In technique scheme, the pulsewidth scope of described first chirped pulse 1 that described beam splitting time-delay mechanism 4 produces is 100 femtoseconds-5 psecs; The pulsewidth scope of the described second no chirped pulse 2 is 20 femtoseconds-500 femtoseconds.
In technique scheme, described beam splitting time-delay mechanism 4 makes described the 3rd chirped pulse 3 fall behind 200-300 photoperiods than described first chirped pulse 1, just falls behind the 0.5-1 psec and incides described plasma.
In technique scheme, described optical splitter 1 is divided into two bundles with described laser chirped pulse 0, and wherein a branch of energy is restrainted greater than another, and the described pulse shortener of a branch of process that energy is little 5 backs form the second no chirped pulse 2; Big a branch of of energy enters described beam splitting time-delay mechanism 4.
In technique scheme, described beam splitting time-delay mechanism 4 makes the energy of the 3rd chirped pulse 3 greater than described first chirped pulse 1.
Compared with prior art, the invention has the advantages that:
1) pulse compression efficient can reach more than 90%;
2) have high light intensity damage threshold, can bear 10
14-10
17Watt/centimetre
2The laser of intensity.
Description of drawings
The structure principle chart of the generic media chirped mirror of Fig. 1 prior art;
Fig. 2 the present invention produces the schematic diagram of plasma chirped mirror;
The work synoptic diagram of Fig. 3 plasma chirped mirror of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Plasma is by a kind of state of matter of forming of free electron and ion after general material is ionized.Plasma is to be electroneutral on the whole.Because plasma does not have the fire damage threshold value, so it is a kind of special media of capable control intense laser pulse.The present invention is a kind of chirp impulse compression method and device based on plasma medium.
This material that is gaseous state of plasma can not be processed into the thin layer of different-thickness as common transparent medium, and bonding is got up then.The present invention utilizes the way of optics to produce into plasma chirped pulse compression set
With reference to Fig. 3, make a kind of chirped pulse compression set of the present invention, comprising: laser instrument 10 sends laser chirped pulse 0, this laser instrument 10 is a titanium-doped sapphire laser, optical maser wavelength is 0.8 micron, and the laser pulse width that this laser instrument 10 sends is adjustable, and the pulsewidth scope is 100 femtoseconds-5 psecs; Optical splitter 11 is divided into two bundles with described laser chirped pulse 0, and a branch of energy is more than the twice of another bundle, and present embodiment is such as getting 2.6 times; Wherein bigger a branch of of energy is divided into first chirped pulse 1 and the 3rd chirped pulse 3 through a beam splitting time-delay mechanism 4, and the energy of the 3rd chirped pulse 3 is more than times of first chirped pulse, 1 energy, such as getting 1.5 times; Less a branch of of energy forms the second no chirped pulses 2 through a pulse shortener 5 back; Described first chirped pulse 1 and the 3rd chirped pulse 3 incide the plasma that is produced by a plasma maker 6, and the second no chirped pulse 2 also incides described plasma.
This device also comprises first catoptron 12 between described optical splitter 11 and the described pulse shortener 5, second catoptron 13 and the 3rd catoptron 14 are arranged between described pulse shortener 5 and the described plasma generator capable 6.
The suitable density range of plasma is 0.01-0.5N
C, wherein be N
CBe critical plasma density, N in the present embodiment
CEqual 1 * 10
21Individual/centimetre
3, just plasma density should be 1 * 10
19-5 * 10
20Individual/centimetre
3In the scope; Present embodiment ionic medium volume density is 1 * 10
20/centimetre
3The temperature of plasma should in the present embodiment be 200 electron-volts less than 500 electron-volts simultaneously.
The pulsewidth of described first chirped pulse 1 that beam splitting time-delay mechanism 4 produces is identical with the pulsewidth of the chirped pulse that laser instrument 10 sends, and is 100 femtoseconds-5 psecs; The parameter of pulse shortener 5 is adjustable, and the pulsewidth scope that makes the second no chirped pulse 2 is 20 femtoseconds-500 femtoseconds.
In plasma, needed for 200-300 photoperiods from the formation that is formed into the plasma density modulation of interference fringe is general; Therefore the 3rd chirped pulse 3 falls behind the incident of 200-300 photoperiods than pumping first chirped pulse 1.Beam splitting time-delay mechanism 4 makes described the 3rd chirped pulse 3 fall behind 200-300 photoperiods than described first chirped pulse 1, just falls behind the 0.5-1 psec and incides described plasma.Time delay in the present embodiment was 250 photoperiods, just 660 fly wonderful.
First chirped pulse 1 and the 3rd chirped pulse 3 are equidirectional incident, and both and the second no chirped pulse 2 incide plasma in opposite directions.
As shown in Figure 2, the boxed area of representing with stain among the figure 30 is represented plasma, and first chirped pulse 1 and the second no chirped pulse 2 all are pump lights, and first chirped pulse 1 is positive chirped pulse, and the pulsewidth of control two bundle pump lights makes that their frequency spectrum is the same.Second no chirped pulse 2 short pulses on the right can interfere from right to left successively with the left side first chirped pulse 1.At right-hand member, the space periodic of interference fringe is long, and is shorter at the left end period ratio.The laser ponderomotive force that periodic interference optical field produces can be shifted electronics onto intensity little place from the big place of interference field intensity.ELECTRON OF MOTION can spur and then motion together of ion by the Coulomb force.Will form the plasma density modulation that distributes corresponding fully with interference fringe at last, perhaps be the plasma Bragg grating.Because space periodic heterogeneous, device of the present invention can also be called the plasma chirped mirror, and the damage threshold of this plasma chirped mirror reaches 1000 joules/centimetre
2More than.
Can prove the chirped mirror structure that produces by said method, can be used for compressing well pumping first chirped pulse 1 a duplicate positive chirped pulse with the generation chirped mirror of left end incident, it is called flashlight, is exactly the 3rd chirped pulse 3 in the present embodiment.Identical chirped pulse of incident behind the certain hour at interval in pumping chirped pulse 1 back just, this pulse will be compressed.
The compression efficiency of present embodiment can reach more than 90%.The energy of first chirped pulse 1 and the second no chirped pulse 2 is less than the 3rd chirped pulse 3 in the present embodiment, and the energy of pulse 0 promptly to be compressed mainly is in the 3rd chirped pulse 3.First chirped pulse 1 and the second ultrashort no chirped pulse 2 are got to one section plasma that is produced by plasma generator capable 6 simultaneously, induce to form a plasma chirped mirror.When the 3rd chirped pulse 3 incides in the plasma chirped mirror, will obtain compression.The 3rd chirped pulse 3 is that flashlight to be compressed is arranged, and the pulse width of first chirped pulse 1 and the 3rd chirped pulse 3 is the same with the width of inceptive impulse 0.
The intensity of pump light chirped pulse 1 and no chirped pulse 2 is 10
14-10
17Watt/centimetre
2Can produce the plasma chirped mirror in the scope, the intensity of first chirped pulse 1 is 5 * 10 in the present embodiment
15Watt/centimetre
2, the intensity of second pulse 2 is 5 * 10
15Watt/centimetre
2
The intensity of signal the 3rd chirped pulse 3 reaches 5 * 10 in the present embodiment
15Watt/centimetre
2And in the prior art, as metal or the insulating material of making common grating, be can not bear 10 far away
14-10
17Watt/centimetre
2The laser of intensity.
Beam splitting delayed time system 4 adopts the Dog-Leg light path system, comprises two completely reflecting mirrors, two partially reflecting mirrors and an optical filter substantially, specifically sees also document: J.Zhang et al.Phys.Rev.A 53,3640,2001.
The gratings compressor that sell in the market that pulse compression system 5 adopts high intensity laser generally to adopt.
The plasma generator capable that plasma generator capable 6 adopts market to sell is such as the plasma generator capable that adopts methods such as capillary discharging, the highly dense gas jet of ionization or solid film.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1, a kind of chirp impulse compression method comprises the steps:
1) provides one section plasma;
2) provide first chirped pulse to incide described plasma, the pulsewidth scope of described first chirped pulse is 100 femtoseconds-5 psecs;
3) provide the second no chirped pulse along oppositely inciding described plasma, the pulsewidth scope of the described second no chirped pulse is 20 femtoseconds-500 femtoseconds; The pulsewidth of described first chirped pulse is greater than the pulsewidth of the described second no chirped pulse;
4) chirped laser pulse to be compressed is incided described plasma along the direction identical with described first chirped pulse, described laser pulse to be compressed incides described plasma than backward 200-300 photoperiods of described first chirped pulse.
According to the described chirp impulse compression method of claim 1, it is characterized in that 2, the density range of described plasma is 0.01-0.5N
C, N wherein
CIt is critical plasma density.
3, a kind of chirped pulse compression set comprises:
One laser instrument (10) sends laser chirped pulse (0);
One optical splitter (11), described laser chirped pulse (0) is divided into two bundles, wherein a branch ofly be divided into first chirped pulse (1) and the 3rd chirped pulse (3) through a beam splitting time-delay mechanism (4), another bundle forms the second no chirped pulse (2) through a pulse shortener (5) back; Described first chirped pulse (1) and the 3rd chirped pulse (3) incide the plasma that is produced by a plasma maker (6), and the described second no chirped pulse (2) is along oppositely inciding described plasma;
Between described optical splitter (11) and the described pulse shortener (5) first catoptron (12) is arranged, second catoptron (13) and the 3rd catoptron (14) are arranged between described pulse shortener (5) and the described plasma generator capable (6).
According to the described chirped pulse compression set of claim 3, it is characterized in that 4, the density range of described plasma is 0.01-0.5N
C, wherein be N
CIt is critical plasma density.
According to the described chirped pulse compression set of claim 3, it is characterized in that 5, the pulsewidth of first chirped pulse (1) that described beam splitting time-delay mechanism (4) produces is greater than the pulsewidth of the described second no chirped pulse (2) of described pulse shortener (5) formation; The pulsewidth scope of described first chirped pulse (1) is 100 femtoseconds-5 psecs; The pulsewidth scope of the described second no chirped pulse (2) is 20 femtoseconds-500 femtoseconds.
According to the described chirped pulse compression set of claim 3, it is characterized in that 6, described the 3rd chirped pulse (3) incides described plasma than backward 200-300 photoperiods of described first chirped pulse (1).
7, according to the described chirped pulse compression set of claim 3, it is characterized in that, described optical splitter (1) is divided into two bundles with described laser chirped pulse (0), wherein a branch of energy is more than the twice of another bundle, wherein the described beam splitting time-delay mechanism of a branch of process that energy is big (4) is divided into first chirped pulse (1) and the 3rd chirped pulse (3), and the energy of described the 3rd chirped pulse (3) is more than a times of first chirped pulse (1) energy; The energy of described the 3rd chirped pulse (3) is greater than the energy of described first chirped pulse (1); The described pulse shortener of a branch of process (5) back that wherein energy is little forms the second no chirped pulse (2).
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| CNB2006100762551A CN100504566C (en) | 2006-04-21 | 2006-04-21 | Chirp impulse compression method and device |
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| CNB2006100762551A CN100504566C (en) | 2006-04-21 | 2006-04-21 | Chirp impulse compression method and device |
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| CN100504566C true CN100504566C (en) | 2009-06-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8883028B2 (en) * | 2011-12-28 | 2014-11-11 | Lam Research Corporation | Mixed mode pulsing etching in plasma processing systems |
| CN103984184B (en) * | 2014-05-19 | 2016-08-24 | 上海交通大学 | Light pulse compressive reflexes device |
| CN104614915B (en) * | 2014-12-24 | 2017-06-23 | 中国科学院半导体研究所 | Laser pulse compression and broadening system |
| CN107101946B (en) * | 2017-06-28 | 2019-11-15 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN111525380A (en) * | 2020-04-01 | 2020-08-11 | 张丽 | Method for constructing double-pulse light path and structure thereof |
| CN111681783B (en) * | 2020-06-23 | 2022-07-19 | 中国科学院物理研究所 | Laser fusion ignition device and fusion ignition method |
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| WO2003096495A1 (en) * | 2002-05-10 | 2003-11-20 | The Regents Of The University Of Colorado | Pulse amplification with stretcher providing negative dispersion |
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2006
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| US6198568B1 (en) * | 1997-04-25 | 2001-03-06 | Imra America, Inc. | Use of Chirped Quasi-phase-matched materials in chirped pulse amplification systems |
| US20030112494A1 (en) * | 2001-12-13 | 2003-06-19 | The Regents Of The University Of California | Hybrid chirped pulse amplification system |
| WO2003096495A1 (en) * | 2002-05-10 | 2003-11-20 | The Regents Of The University Of Colorado | Pulse amplification with stretcher providing negative dispersion |
| CN1431740A (en) * | 2003-02-14 | 2003-07-23 | 中国科学院上海光学精密机械研究所 | Optical parameter chatter pulses amplification laser system |
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