CN104184032A - Novel pulse amplification device and method - Google Patents
Novel pulse amplification device and method Download PDFInfo
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- CN104184032A CN104184032A CN201410457001.9A CN201410457001A CN104184032A CN 104184032 A CN104184032 A CN 104184032A CN 201410457001 A CN201410457001 A CN 201410457001A CN 104184032 A CN104184032 A CN 104184032A
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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 novel chirped pulse amplifying device, what relate generally to is particle high field experimental study, belongs to high-energy physics field.
Background technology
Only formed by the Electric and magnetic fields of mutually orthogonal vibration in the plane vertical with its direction of propagation.Light intensity be proportional to composition light wave electric field square with square sum in magnetic field.Because laser has fabulous room and time coherence, so the electric field in laser beam is than large many orders of magnitude of the electric field of common incoherent light source.Think that at present the least unit atom of material is with molecular around the electricity of atomic nucleus motion by atomic nucleus.Behavior and character that in the to the effect that material of tradition atomic physics research, electronics shows under the electric field action of intratomic.In recent years, due to the important breakthrough of ultrashort-pulse chirp amplification (chirped pulse amplification) technology, current ultra-short pulse laser can produce the electric field more much better than than intratomic electric field after focusing on, thereby the mankind has been had finally can thoroughly change and control motion and then the ability of change physical property and state of electronics in material.Intraatomic electric field strength is very large.Taking hydrogen atom as example, the intratomic electric field strength that bound electron moves in hydrogen atom is up to 5*10
9this electric field of V/ cm. has actually pretends simple a comparison more: the strength of occurring in nature lightning is huge, as powerful as a thunderbolt its power of describing; But, the electric field that lightning produces be only equivalent to 1,000,000 of intratomic electric field/! If the intensity of intratomic electric field is used for accelerating electronics, only need the acceleration distance of 10cm just electronics can be accelerated to 5*10
10the energy of eV, this is about as much as and on the LEP accelerator of Geneva 27km girth, accelerates just obtainable energy of many circles.The electric field that wants to make laser is greatly to can be compared with the electric field of intratomic, and the light field of laser at least will reach 3*10
16w/ cm
2.This is for general long pulse (pulsewidth > 10
-9s) laser is a target being unable to reach.Just because of this reason, the research of mankind's characteristics of motion in the electric field that is better than intratomic electric field for material is a blank substantially; And this situation has had huge change now.The important breakthrough of ultrashort-pulse chirp amplifying technique in recent years, makes laser intensity improve 5 to 6 orders of magnitude.The focusing light intensity of this new pattern laser is up to 10
20w/ cm
2, the electric field strength producing is much larger than the internal electric field of atom, and the general principle of pulse chirp amplifying technique is as shown in Fig. 1: from broadband ultrashort pulse (< 10
-12s) oscillator sends the broadening-amplification-compression of Fig. 1 ultrashort light pulse and obtains ultrashort laser pulse, and it first postpones optical element (for example grating) by a dispersion makes its pulse duration obtain 10
3to 10
5broadening doubly, then injects laser amplifier and amplifies, to obtain large as far as possible energy.Because laser pulse is now very wide, so the laser pulse light intensity after amplifying is still lower than the damage threshold of laser medium.After laser amplifier, then by a conjugation dispersion compensation optical element, the laser pulse recompression after amplifying is got back to original pulse duration.After the Laser Focusing producing like this, can produce and exceed 10
20w/ cm
2light intensity.At present, the Rutherford experiment chamber of Britain, France in the laser aid of livermore national laboratory of Mel laboratory and the U.S. all there is such ability.The laser aid of China and other countries is also all among transformation.It is worth mentioning that, by the amplifying technique of warbling to the transformation of original laser aid compared with relying on expansion of laser light output bore, increase the scheme that Laser output way improves laser power and want economy, much worthwhile.These all belong to everybody known technology in prior art, and details can be referring to " a high field physics-mono-brand-new subject " literary composition of Zhang Jie more specifically.Just because of the importance like this of chirped pulse amplification, the research that amplify for chirped pulse countries in the world is also extremely enthusiastically, various chirped pulse amplifiers are there are, its principle adopting is all as noted above, what the stretcher that wherein adopted and compressor reducer adopted is all grating or grating pair, grating or grating pair are made relative complex, cost is high, may and be not suitable for all researchers' selection in the not too high occasion of ask for something, the present invention is directed to this and proposed a kind of amplifying device that can substitute above-mentioned stretcher and compressor reducer.
Summary of the invention
The present invention is directed to problem above, proposed a kind of novel chirped pulse amplifying device.
The invention provides a kind of chirped pulse amplifying device, comprise the oscillator and the amplifier that in light path, set gradually, it is characterized in that: also comprise the first phase-plate and the second phase-plate, the first phase-plate and the second phase-plate separation amplifier both sides, these two phase-plates have identical shape and size, and formed by identical material manufacture, if be defined as the origin of phase-plate with the center of phase-plate, if the coordinate of certain point is (x on the first phase-plate, y), phase place for this place through the light beam of this phase-plate is Φ 1xy, for point (x identical on the second phase-plate, y), for identical light beam, the phase place at this place is Φ 2xy, for all location points of whole phase-plate, the phase place at two phase-plate same position places and be constant, also be Φ 1xy+ Φ 2xy=constant, and each phase-plate is all non-even phase plates, also be that phase number on whole phase-plate can not be identical, light beam is to pass in identical position and scope in vertical mode on two phase-plates, the first phase-plate and the second phase-plate are wherein formed by translucent material manufacture, wherein each phase-plate is all platy structures, comprise two sides, one of them side is plane, another one side is the face with differing heights convex cylinder, the wherein height of two of two phase-plate same positions projections and be constant, if also by staggered relatively the face with projection of two phase-plates and merging, so just in time can form an inside without any space cuboid, because the height of two projections at two phase-plate same position places with on whole phase-plate, be consistent, they have formed a complementary structure.
According to one embodiment of present invention, the first described phase-plate and the second phase-plate are the glass of being manufactured by same material, quartz or resin plate.
Brief description of the drawings
Fig. 1 is the schematic diagram of chirped pulse amplifying device in prior art;
Fig. 2 is chirped pulse amplifying device schematic diagram of the present invention;
Fig. 3 shows phase place schematic diagram of the present invention.
Embodiment
On basis by reference to the accompanying drawings, be further described in more detail for content of the present invention below.
Fig. 2 shows the schematic diagram of device of high power laser of the present invention.Wherein 1 represents oscillator, and 3 represent amplifier, and these all belong to prior art, are no longer described in detail at this.Wherein 2 and 4 is two phase-plates that adopt in the present invention, these two phase-plate separations are in the both sides of amplifier, under regard to these two phase-plates and be described in detail, these two phase-plates have identical shape and size, and formed by identical material manufacture, if be defined as the origin of phase-plate with the center of phase-plate, wherein on phase-plate 2, the coordinate of certain point is (x, y), phase place for this place through the light beam of this phase place is Φ 1xy, point (x on phase-plate 4, y), for identical light beam, the phase place at this place is Φ 2xy, for whole phase-plate, the phase place at two phase-plate same position places and be constant, also be Φ 1xy+ Φ 2xy=constant, also the i.e. phase place of two points at same coordinate place and constant on two phase-plates, and each phase-plate is all non-even phase plates, also be that phase number on whole phase-plate can not be identical, and light beam on two phase-plates to pass in vertical and identical position and scope, if also light beam irradiates scope on phase-plate 2 is (x1, y1) to (x2, y2), also should be (x1 in the scope being irradiated on phase-plate 4 so, y1) to (x2, y2).
For two phase-plates, its heterogeneity is higher, stronger for the amplified energy upper capability that improves whole amplifier.For two phase-plates, its simple example can be two glass plates, these two glass plates are made up of identical material, in order to make these two glass plates meet above-mentioned phase condition, can simply modulate the thickness of glass plate, for identical light medium, phase place is thickness, as long as so make the thickness of two glass plate same positions and remain constant, for example first glass plate point (x1, y1) thickness of locating is 1, second glass plate point (x1, y1) thickness of locating can be set to 2, first glass plate point (x2, y2) thickness of locating is 1.5, second glass plate point (x2, y2) thickness of locating is 1.5, so just meet the requirement of 1+2=1.5+1.5=3, simultaneously by other phase place a little and all remain 3, and each phase place is all made as to non-homogeneous phase-plate, also the thickness that is whole phase-plate can not be identical.Simultaneously, for the convenience on making, can and not require that the phase place on each point all changes in making yet, whole phase place can be divided into fenestral fabric, wherein each grid is a unit, phase place in this unit grids is constant, in this case, as long as ensure the phase place of two grids of same position on two phase-plates and remain constant.
Fig. 3 shows a pair of phase-plate of the present invention, a wherein phase-plate of 2 and 4 each expressions, these two phase-plates can be manufactured by translucent material arbitrarily, for example quartz, glass, or the materials such as resin, wherein each phase-plate is all platy structures, comprise two sides, one of them side is plane, another one side is the face with differing heights convex cylinder, the wherein height of two of two phase-plate same positions projections and be constant, if also by staggered relatively the face with projection of two phase-plates and merging, so just in time form a rectangular structure, also i.e. phase-plate 2 and phase-plate 4 as shown in Figure 3, if two phase-plates are merged according to illustrated mode, so just in time can form an inside without any space cuboid, because the height of two projections at two phase-plate same position places with on whole phase-plate, be consistent, they have formed a complementary structure.
Adopt phase-plate of the present invention, first, when laser beam is spatially modulated phase place laser beam through after first phase-plate, because phase-plate is phase-plate heterogeneous, thereby reduce the spatial coherence of laser beam (also just because of this, the aperiodicity of phase-plate is stronger, the spatial coherence that it brings reduces larger), thereby make the reduction of laser beam unit are self-energy density, and when light beam is by after second phase-plate, due to the phase point place phase place of two phase-plates be constant, second phase-plate can be modulated again to the phase modulation being caused by first phase-plate, make the space phase distribution of laser beam return to initial relevant situation, in this way, can replace to a certain extent original stretcher and compressor reducer.
Method according to said apparatus is also disclosed simultaneously, comprise, the pulse laser of being exported by oscillator is successively through the first phase-plate, amplifier, with the second phase-plate, these two phase-plates have identical shape and size, and formed by identical material manufacture, if be defined as the origin of phase-plate with the center of phase-plate, if the coordinate of certain point is (x on the first phase-plate, y), phase place for this place through the light beam of this phase-plate is Φ 1xy, for point (x identical on the second phase-plate, y), for identical light beam, the phase place at this place is Φ 2xy, for all location points of whole phase-plate, the phase place at two phase-plate same position places and be constant, also be Φ 1xy+ Φ 2xy=constant, and each phase-plate is all non-even phase plates, also be that phase number on whole phase-plate can not be identical, light beam is to pass in identical position and scope in vertical mode on two phase-plates, the first phase-plate and the second phase-plate are wherein formed by translucent material manufacture, wherein each phase-plate is all platy structures, comprise two sides, one of them side is plane, another one side is the face with differing heights convex cylinder, the wherein height of two of two phase-plate same positions projections and be constant, if also by staggered relatively the face with projection of two phase-plates and merging, so just in time can form an inside without any space cuboid, because the height of two projections at two phase-plate same position places with on whole phase-plate, be consistent, they have formed a complementary structure.
Claims (4)
1. a chirped pulse amplifying device, comprise the oscillator and the amplifier that in light path, set gradually, it is characterized in that: also comprise the first phase-plate and the second phase-plate, wherein the first phase-plate and the second phase-plate are positioned at the both sides of amplifier, and the first phase-plate is between amplifier and oscillator, these two phase-plates have identical shape and size, and formed by identical material manufacture, if be defined as the origin of phase-plate with the center of phase-plate, if the coordinate of certain point is (x on the first phase-plate, y), phase place for this place through the light beam of this phase-plate is Φ 1xy, for point (x identical on the second phase-plate, y), for identical light beam, the phase place at this place is Φ 2xy, for all location points of whole phase-plate, the phase place at two phase-plate same position places and be constant, also be Φ 1xy+ Φ 2xy=constant, and each phase-plate is all non-even phase plates, also be that phase number on whole phase-plate can not be identical, light beam is to pass in identical position and scope in vertical mode on two phase-plates, the first phase-plate and the second phase-plate are wherein formed by translucent material manufacture, wherein each phase-plate is all platy structures, comprise two sides, one of them side is plane, another one side is the face with differing heights convex cylinder, the wherein height of two of two phase-plate same positions projections and be constant, if also by staggered relatively the face with projection of two phase-plates and merging, so just in time can form an inside without any space cuboid, because the height of two projections at two phase-plate same position places with on whole phase-plate, be consistent, they have formed a complementary structure.
2. chirped pulse amplifying device according to claim 1, is characterized in that: the first described phase-plate and the second phase-plate are that one or more manufactures in following material form: glass, quartz, resin.
3. a chirped pulse amplification method, it is characterized in that: the pulse laser of being exported by oscillator is successively through the first phase-plate, amplifier, with the second phase-plate, these two phase-plates have identical shape and size, and formed by identical material manufacture, if be defined as the origin of phase-plate with the center of phase-plate, if the coordinate of certain point is (x on the first phase-plate, y), phase place for this place through the light beam of this phase-plate is Φ 1xy, for point (x identical on the second phase-plate, y), for identical light beam, the phase place at this place is Φ 2xy, for all location points of whole phase-plate, the phase place at two phase-plate same position places and be constant, also be Φ 1xy+ Φ 2xy=constant, and each phase-plate is all non-even phase plates, also be that phase number on whole phase-plate can not be identical, light beam is to pass in identical position and scope in vertical mode on two phase-plates, the first phase-plate and the second phase-plate are wherein formed by translucent material manufacture, wherein each phase-plate is all platy structures, comprise two sides, one of them side is plane, another one side is the face with differing heights convex cylinder, the wherein height of two of two phase-plate same positions projections and be constant, if also by staggered relatively the face with projection of two phase-plates and merging, so just in time can form an inside without any space cuboid, because the height of two projections at two phase-plate same position places with on whole phase-plate, be consistent, they have formed a complementary structure.
4. chirped pulse amplification method according to claim 3, is characterized in that: the first described phase-plate and the second phase-plate are that one or more manufactures in following material form: glass, quartz, resin.
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| CN201410457001.9A CN104184032B (en) | 2014-09-10 | 2014-09-10 | Novel pulse amplification device and method |
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| CN201410457001.9A CN104184032B (en) | 2014-09-10 | 2014-09-10 | Novel pulse amplification device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594561A (en) * | 2018-06-19 | 2018-09-28 | 河北科技大学 | A kind of laser amplification device |
| CN108808435A (en) * | 2018-06-19 | 2018-11-13 | 河北科技大学 | A kind of laser amplification device driven by voltage |
| CN110024239A (en) * | 2017-01-26 | 2019-07-16 | 极光先进雷射株式会社 | Laser system |
Citations (5)
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| US20030112494A1 (en) * | 2001-12-13 | 2003-06-19 | 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 |
| US20060120418A1 (en) * | 2004-12-07 | 2006-06-08 | Imra America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
| 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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2014
- 2014-09-10 CN CN201410457001.9A patent/CN104184032B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030112494A1 (en) * | 2001-12-13 | 2003-06-19 | 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 |
| US20060120418A1 (en) * | 2004-12-07 | 2006-06-08 | Imra America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110024239A (en) * | 2017-01-26 | 2019-07-16 | 极光先进雷射株式会社 | Laser system |
| US11025026B2 (en) | 2017-01-26 | 2021-06-01 | Gigaphoton Inc. | Laser system |
| US11682877B2 (en) | 2017-01-26 | 2023-06-20 | Gigaphoton Inc. | Laser system |
| CN108594561A (en) * | 2018-06-19 | 2018-09-28 | 河北科技大学 | A kind of laser amplification device |
| CN108808435A (en) * | 2018-06-19 | 2018-11-13 | 河北科技大学 | A kind of laser amplification device driven by voltage |
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| CN104184032B (en) | 2017-02-15 |
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