CN104184032B - Novel pulse amplification device and method - Google Patents
Novel pulse amplification device and method Download PDFInfo
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- CN104184032B CN104184032B CN201410457001.9A CN201410457001A CN104184032B CN 104184032 B CN104184032 B CN 104184032B CN 201410457001 A CN201410457001 A CN 201410457001A CN 104184032 B CN104184032 B CN 104184032B
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Abstract
Provided are a novel pulse amplification device and method. The novel pulse amplification device comprises an oscillator and an amplifier which are sequentially arranged on a light path. The novel pulse amplification device further comprises a first phase plate and a second phase plate, the first phase plate and the second phase plate are located on the two sides of the amplifier respectively, and the first phase plate and the second phase plate are identical in shape and size and are made of identical materials. If the centers of the phase plates are defined as coordinates of original points of the phase plates and coordinates of some point on the first phase plate are (x, y), the phase of the position of a light beam penetrating through the first phase plate is Phi1xy; for the same point (x, y) on the second phase plate, the phase of the position of the same light beam is Phi2xy; for all position points on the whole phase plates, Phi1xy plus Phi2xy equals to a constant. Each phase plate is a non-uniform phase plate, and the light beam perpendicularly penetrates through the two phase plates at the identical positions and in the identical ranges.
Description
Technical field
The present invention relates to a kind of new chirped pulse amplification device, it is primarily related to particle high field experimental study, belong to
In high-energy physics field.
Background technology
Just it is made up of the electric field and magnetic field of vibration mutually orthogonal in the plane vertical with its direction of propagation.The intensity of light
It is proportional to square sum square with magnetic field of the electric field of composition light wave.It is concerned with because laser has fabulous room and time
Property, so the many orders of magnitude bigger than the electric field of usual incoherent light source of the electric field in laser beam.It is now recognized that material is
Subsection atom is molecular with the electricity around atom nuclear motion by atomic nucleus.Conventional atom physics research is to the effect that
Behavior and property that in material, electronics shows under the electric field action of intratomic.In recent years, because ultrashort-pulse chirp amplifies
The important breakthrough of (chirped pulse amplification) technology, current ultra-short pulse laser may be used after focusing on
With the electric field that producing ratio intratomic electric field is much better than, so that the mankind have finally, and in material electricity can be thoroughly varied and controlled
The motion of son simultaneously and then changes the ability of physical property and state.Intraatomic electric-field intensity is very big.Taking hydrogen atom as a example,
The atom electric field intensity inside high that bound electron moves in hydrogen atom is up to 5*109How strong this electric field of V/ cm. have actually?Make
Individual simply compare:In nature, the strength of lightning is huge, as powerful as a thunderbolt describes its power;But, lightning
Produced electric field only just corresponds to 1/1000000th of intratomic electric field!If the intensity of atom internal electric field is used for accelerating electricity
It is only necessary to electronics just can be accelerated to 5*10 by the acceleration distance of 10cm if son10The energy of eV, this is about as much as
Many circles just obtainable energy is accelerated on the LEP accelerator of Geneva 27km girth.Big the arriving of electric field wanting to make laser can
With compared with atom internal electric field, the light field 3*10 at least to be reached of laser16W/ cm2.This is for general long pulse (pulsewidth>
10-9S), for laser, it is a target being unable to reach.Just because of this reason, the mankind for material be better than former
The research of the characteristics of motion in the electric field of sub- internal electric field is substantially a blank;And this situation changes now with huge
Become.The important breakthrough of ultrashort-pulse chirp amplifying technique is so that laser intensity improves 5 to 6 orders of magnitude in recent years.This
The focusing light intensity of new pattern laser is up to 1020W/ cm2, produced electric-field intensity is much larger than the internal electric field of atom, pulse chirp
The general principle of amplifying technique is as shown in Fig. 1:From broadband ultrashort pulse (< 10-12S) oscillator sends Fig. 1 ultrashort laser arteries and veins
Rush broadening-amplification-compression and obtain ultrashort laser pulse, it first passes through dispersion delay optical element (such as grating) and makes
Its pulse width obtains 103To 105Broadening again, is then injected into being amplified in laser amplifier, as big as possible to obtain
Energy.Because laser pulse now is very wide, so the laser pulse light intensity after amplifying is still below the destruction threshold of laser medium
Value.After laser amplifier, then by a conjugation dispersion compensation optical element, the laser pulse recompression after amplifying
Return to original pulse width.Can produce more than 10 after the Laser Focusing so producing20W/ cm2Light intensity.At present, Britain
Rutherford experiment room, the laser aid of livermore national laboratory of Mel laboratory and the U.S. all has in France
Such ability.The laser aid of China and other countries is also all among transformation.It should be noted that with amplification of warbling
Technology exports bore, increases laser output way to improve laser compared with dependence expansion of laser light to the transformation of original laser aid
The scheme of power come economical, worthwhile much.These broadly fall into known technology in prior art, and more specifically details can
Referring to Zhang Jie's《The brand-new subject of Strong-field physics-》One literary composition.Just because of such importance of chirped pulse amplification,
Countries in the world are also extremely enthusiastically for the research of chirped pulse amplification, occur in that various chirped pulse amplification devices, its
The principle being adopted is all as noted above, what the stretcher employed in it and compressor reducer were adopted be all grating or
Grating pair, grating or grating, to making relative complex, high cost, require less high occasion may be not appropriate for institute at some
There is the selection of researcher, the present invention proposes a kind of amplifying device that can substitute above-mentioned stretcher and compressor reducer for this.
Content of the invention
The present invention is directed to problem above it is proposed that a kind of new chirped pulse amplification device.
The invention provides a kind of chirped pulse amplification device, including the oscillator setting gradually in light path and amplifier,
It is characterized in that:Also include first phase plate and second phase plate, first phase plate and second phase plate separation amplifier both sides,
This two phase-plates have same shape and size, and are formed by identical material manufacture, if with phase place
The center of plate is defined as the origin of phase-plate, if the coordinate of certain point is on first phase plate(x,y), should for passing through
For the light beam of phase-plate, the phase place at this is Φ 1xy, for identical point on second phase plate(x,y), for identical light
For bundle, the phase place at this is Φ 2xy, then for all of location point for whole phase-plate, at two phase-plate same positions
Phase place and be constant, namely Φ 1xy+ Φ 2xy=constant, and each phase-plate is all non-even phase plate, namely entirely
Phase number on phase-plate can not be identical, and light beam is in vertical manner in identical position on two phase-plates
Put with scope in pass through, first phase plate therein and second phase plate are fabricated by by translucent material, wherein each phase
Position plate is all a platy structure, and including two sides, one of side is plane, and another one side is to have different height
The face of degree convex cylinder, the height of two projections of two of which phase-plate same position and be constant, namely if by two
Individual phase-plate have projection face staggered relatively and merge, then just can form an inside does not have any space rectangular
Body because the height of two projections at two phase-plate same positions be consistent on whole phase-plate, they form
One complementary structure.
According to one embodiment of present invention, described first phase plate is by identical material manufacture with second phase plate
Glass, quartz or resin plate.
Brief description
Fig. 1 is the schematic diagram of chirped pulse amplification device in prior art;
Fig. 2 is the chirped pulse amplification schematic device of the present invention;
Fig. 3 shows phase place schematic diagram of the present invention.
Specific embodiment
On the basis of combining accompanying drawing, present disclosure is further described in more detail below.
Fig. 2 shows the schematic diagram of the device of high power laser of the present invention.Wherein 1 expression oscillator, 3 expression amplifiers,
These broadly fall into prior art, and here is no longer described in detail.Wherein 2 and 4 is two phase-plates adopting in the present invention, this
Two phase-plates are lived apart in the both sides of amplifier, are described in detail below for this two phase-plates, this two phase-plates
There is same shape and size, and formed by identical material manufacture, if the center definition with phase-plate
For the origin of phase-plate, wherein on phase-plate 2, the coordinate of certain point is(x,y), for the light beam through this phase place
Phase place at this is Φ 1xy, point on phase-plate 4(x,y), for identical light beam, the phase place at this is Φ 2xy, then for
For whole phase-plate, phase place at two phase-plate same positions and be constant, namely Φ 1xy+ Φ 2xy=constant, namely
The phase place of two points at same coordinate on two phase-plates and constant, and each phase-plate is all non-even phase plate,
I.e. the phase number on whole phase-plate can not be identical, and light beam is with vertical and identical on two phase-plates
Position and scope in pass through, namely if light beam is radiated at scope on phase-plate 2 be(X1, y1)Arrive(X2, y2), then
The scope being irradiated on phase-plate 4 should also be as(X1, y1)Arrive(X2, y2).
For two phase-plates, its heterogeneity is higher, then for the amplified energy upper limit improving whole amplifier
Ability is stronger.For two phase-plates, its simply example can be two glass plates, and this two glass plates are by identical
Material is constituted, so that this two glass plates meet above-mentioned phase condition, can simply the thickness of glass plate be adjusted
System, for identical optical medium, phase place is thickness, as long as so making thickness and the guarantor of two glass plate same positions
Hold as constant, such as first glass plate point(X1, y1)The thickness at place is 1, second glass plate point(X1, y1)The thickness at place can
It is set to 2, first glass plate point(X2, y2)The thickness at place is 1.5, second glass plate point(X2, y2)Place thickness be
1.5, then just meet the requirement of 1+2=1.5+1.5=3, simultaneously by other phase place a little and all remain 3, and
And each phase place is all made as non-homogeneous phase-plate, namely the thickness of whole phase-plate can not be identical.Meanwhile, in order to make
Convenience on work, the phase place also being not required for when making on each point all changes, and can divide whole phase place
For fenestral fabric, wherein each grid is a unit, and the phase place in this unit grids is constant, in this case,
As long as ensureing on two phase-plates the phase place of two grids of same position and remaining constant.
Fig. 3 shows a pair of phase-plate of the present invention, wherein 2 and 4 one phase-plate of each expression, this two phase places
Plate can be manufactured by arbitrary translucent material, for example the material such as quartz, glass, or resin, and wherein each phase-plate is all one
Individual platy structure, including two sides, one of side is plane, and another one side is to have differing heights convex cylinder
Face, the height of two projections of two of which phase-plate same position and be constant, namely if by two phase-plates
The face with projection is staggered relatively and merge, then just form a rectangular structure, namely phase place as shown in Figure 3
Plate 2 and phase-plate 4, if two phase-plates are merged by mode as illustrated, then just can form an inside and not appoint
What space cuboid because the height of two projections at two phase-plate same positions be consistent on whole phase-plate
, they constitute a complementary structure.
Using the phase-plate of the present invention, first, after laser beam passes through first phase-plate i.e. to laser beam in space
On phase place is modulated, because phase-plate is phase-plate heterogeneous, thus reducing the spatial coherence of laser beam(?
Just because of this, the aperiodicity of phase-plate is stronger, and the spatial coherence that it brings reduces bigger), so that laser beam list
Plane amasss the reduction of interior energy metric density, and works as light beam by after second phase-plate, at the phase point of two phase-plates
Phase place and be constant, second phase-plate the phase modulation being caused by first phase-plate can be modulated again so that
The space phase distribution of laser beam returns to initial coherent case, in this way, can replace original to a certain extent
Stretcher and compressor reducer.
Also disclose the method according to said apparatus, including sequentially passing through by the pulse laser that oscillator exports simultaneously
One phase-plate, amplifier, and second phase plate, this two phase-plates have same shape and size, and by complete
Identical material manufacture forms, if being defined as the origin of phase-plate with the center of phase-plate, if on first phase plate
Certain point coordinate be(x,y), for the light beam through this phase-plate, the phase place at this is Φ 1xy, for second phase
Identical point on plate(x,y), for identical light beam, the phase place at this is Φ 2xy, then all of for whole phase-plate
For location point, phase place at two phase-plate same positions and be constant, namely Φ 1xy+ Φ 2xy=constant, and each
Phase-plate is all non-even phase plate, namely the phase number on whole phase-plate can not be identical, and light beam is in two phase places
Pass through in identical position and scope in vertical manner on plate, first phase plate therein and second phase plate
It is fabricated by by translucent material, wherein each phase-plate is all a platy structure, including two sides, one of side
For plane, another one side is the face with differing heights convex cylinder, and two of two of which phase-plate same position convex
The height of post and be constant, namely if by two phase-plates have projection face staggered relatively and merge, then just
An inside can be formed does not have any space cuboid because the height of two projections at two phase-plate same positions and
It is consistent on whole phase-plate, they constitute a complementary structure.
Claims (4)
1. a kind of chirped pulse amplification device, including the oscillator setting gradually in light path and amplifier it is characterised in that:Also wrap
Include the both sides that first phase plate and second phase plate, wherein first phase plate and second phase plate are located at amplifier, and first
Phase-plate is located between amplifier and oscillator, and this two phase-plates have same shape and size, and by complete
Identical material manufacture forms, if being defined as the origin of phase-plate with the center of phase-plate, if on first phase plate
The coordinate of certain point is (x, y), and the phase place for the light beam through this first phase plate it is assumed that at this is Φ 1xy, for
Identical point (x, y) on second phase plate, it is assumed that phase place at this for the second phase plate is Φ 2xy for identical light beam,
Then for all of location point for whole phase-plate, phase place at two phase-plate same positions and be constant, namely Φ 1xy
+ Φ 2xy=constant, and each phase-plate is all non-even phase plate, namely the phase number on whole phase-plate can not be complete
Exactly the same, light beam passes through on two phase-plates in vertical manner in identical position and scope, therein
First phase plate and second phase plate are fabricated by by translucent material, and wherein each phase-plate is all a platy structure, bag
Include two sides, one of side is plane, and another one side is the face with differing heights convex cylinder, two of which
The height of two projections of phase-plate same position and be constant, namely if the face phase with projection by two phase-plates
To placing and merge, then just can form an inside does not have the cuboid in any space, because two phase-plate identical bits
The height of two projections at the place of putting be consistent on whole phase-plate, they constitute a complementary structure.
2. chirped pulse amplification device according to claim 1 it is characterised in that:Described first phase plate and the second phase
Position plate is that one or more of materials described below is fabricated by:Glass, quartz, resin.
3. a kind of chirped pulse amplification method it is characterised in that:First phase is sequentially passed through by the pulse laser that oscillator exports
Plate, amplifier, and second phase plate, this two phase-plates have same shape and size, and by identical
Material manufacture forms, if being defined as the origin of phase-plate with the center of phase-plate, if certain point on first phase plate
Coordinate be (x, y), the phase place for the light beam through this first phase plate it is assumed that at this be Φ 1xy, for the second phase
Identical point (x, y) on the plate of position, it is assumed that phase place at this for the second phase plate is Φ 2xy for identical light beam, then for
For the whole all of location point of phase-plate, phase place at two phase-plate same positions and be constant, namely Φ 1xy+ Φ 2xy
=constant, and each phase-plate is all non-even phase plate, namely the phase number on whole phase-plate can not be identical,
Light beam passes through on two phase-plates in vertical manner in identical position and scope, first phase therein
Plate and second phase plate are fabricated by by translucent material, and wherein each phase-plate is all a platy structure, including two sides
Face, one of side is plane, and another one side is the face with differing heights convex cylinder, two of which phase-plate phase
With position two projections height and be constant, namely if by two phase-plates have projection face staggered relatively simultaneously
Merge, then just can form an inside does not have the cuboid in any space, because two at two phase-plate same positions
The height of individual projection be consistent on whole phase-plate, they constitute a complementary structure.
4. chirped pulse amplification method according to claim 3 it is characterised in that:Described first phase plate and the second phase
Position plate is that one or more of materials described below is fabricated by:Glass, quartz, resin.
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JP6920354B2 (en) | 2017-01-26 | 2021-08-18 | ギガフォトン株式会社 | Laser system |
CN108594561A (en) * | 2018-06-19 | 2018-09-28 | 河北科技大学 | A kind of laser amplification device |
CN108808435B (en) * | 2018-06-19 | 2020-07-28 | 河北科技大学 | Laser amplification device driven by voltage |
Citations (2)
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CN101814689A (en) * | 2010-04-08 | 2010-08-25 | 四川大学 | Method for improving signal-to-noise ratio of femtosecond laser by using chirp matched optical parametric chirped pulse amplification |
CN102771020A (en) * | 2010-02-24 | 2012-11-07 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate |
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US6873454B2 (en) * | 2001-12-13 | 2005-03-29 | The Regents Of The University Of California | Hybrid chirped pulse amplification system |
US20060050369A1 (en) * | 2004-05-14 | 2006-03-09 | Kafka James D | Pulse width reduction for laser amplifiers and oscillators |
US7508853B2 (en) * | 2004-12-07 | 2009-03-24 | Imra, America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
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CN102771020A (en) * | 2010-02-24 | 2012-11-07 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate |
CN101814689A (en) * | 2010-04-08 | 2010-08-25 | 四川大学 | Method for improving signal-to-noise ratio of femtosecond laser by using chirp matched optical parametric chirped pulse amplification |
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