CN109581682A - Based on the quick beam smoothing method of light beam dynamic interference pattern in inertially confinement fusion device - Google Patents
Based on the quick beam smoothing method of light beam dynamic interference pattern in inertially confinement fusion device Download PDFInfo
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- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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Abstract
The present invention relates in a kind of inertially confinement fusion device based on the quick beam smoothing method of light beam dynamic interference pattern.This method is in Laser Driven inertially confinement fusion device laser light bundle, boundling is divided into the beamlet pair of combination of two, each beamlet is to by identical continuous phase plate and polarization control plate, but its operation wavelength is different and is inserted into a pair of of conjugation or complementary phase board respectively, by realizing the quick even cunning to laser beam far-field focus in the dynamic interference pattern in far field each between of beamlet, to improve the uniformity of focal spot in a shorter integration time.
Description
Technical field
The present invention relates to beam smoothing technologies in a kind of Laser Driven inertial confinement fusion (ICF) device, and in particular to one
Quick beam smoothing method based on light beam dynamic interference pattern in kind Laser Driven inertially confinement fusion device.
Background technique
In inertial confinement fusion (ICF) device of Laser Driven, it is even to be widely used various light beams spatially and temporally
Sliding technology realizes the control to laser beam far-field focus uniformity, to meet the device of high power laser of Physical Experiment requirement
It can accurate control target surface optical field distribution.In the even sliding technology of existing airspace beam, laser light is controlled frequently with continuous phase plate
Beam far-field focus envelope and uniformity, but due to the coherent superposition of sub-light interfascicular inside laser beam, it is deposited inside far-field focus
In pattern.This kind of patterns will lead to various nonlinear instability effects in laser beam and pellet interaction process
Generation, to reduce laser beam to the compression symmetry of pellet, thus need to combine the even sliding technology of time domain beam to inhibit speckle
Presence.The existing even sliding technology of time domain beam includes that the even sliding technology of reduced space incoherent bundle, optical space be smooth, spectrum role
Dissipate even sliding technology and radial beam smoothing technology etc..
The even sliding technology of reduced space incoherent bundle is to irradiate far field using broadband laser source, can obtain fabulous coke
Spot uniformity, but it may be only available for gas excimer laser as laser source, and need to make gas excimer laser
It operates under small energy operating condition, nonlinear optics distortion is generated when transmitting in the amplifier to avoid laser beam.
The optical space smoothing technique is incoherent to convert sky for the time of wideband light source using optical dispersion element
Between it is incoherent so that a large amount of mutually independent interference speckle while being superimposed upon on target surface, to obtain uniform far-field intensity distribution.
This method for reducing front end light source coherence can inhibit the generation that high frequency spatial of the laser beam in far field is modulated, however can be to sharp
The burst length waveform of light generates destruction, influences the transmission and amplification characteristic of laser beam.
The even sliding technology of the spectrum angle dispersion (Smoothing by Spectral Dispersion, SSD) is to pass through electricity
Optical modulator carries out Temporal modulation to laser beam and carries out spectrum angle dispersion using grating, realizes laser beam speckle
Sweeping, thus within the plasma heat even sliding time improve far-field focus uniformity.Currently, due to the modulation of electrooptic modulator
Frequency limited, time tens of picoseconds needed for the even sliding technology of spectrum angle dispersion makes focal spot reach stable and uniform, much larger than each
The rise time of kind nonlinear instability effect, thus spectral modeling Dispersive is unobvious to the effect of nonlinear instability effect.
The radial direction beam smoothing technology refers to through pump light and light kerr medium to laser beam additional cycle ball
Face position is mutually to realize the even cunning of laser beam far-field focus in radial directions, so that it is remote to improve light beam within the shorter time of integration
The uniformity of field focal spot.Time needed for radial beam smoothing technology makes focal spot reach stable and uniform is only several picoseconds, with
The rise time of various nonlinear instability effects is close, can be used as a kind of potential technology way for inhibiting nonlinear effect to increase
Diameter.However, pump light needed for radial beam smoothing technology is difficult to realize, cost is high.
Summary of the invention
The purpose of the present invention be exactly be shortcomings and deficiencies in the presence of overcoming the prior art, provide in a kind of ICF device
Quick beam smoothing new method based on light beam dynamic interference pattern.In ICF device laser light bundle, (boundling is multiple beamlets
Set) in, each beamlet passes through identical continuous phase plate, polarization control plate and lens focus to far field focal plane.The party
Method is the beamlet pair that boundling is divided into combination of two, the continuous phase plate and polarization control plate phase that each pair of beamlet is passed through
Together, but operation wavelength is different and be inserted into a pair of of conjugate phase plate respectively, passes through the dynamic interference each between of beamlet in far field
Pattern realizes the quick even cunning to laser beam far-field focus, to improve the uniform of far-field focus in a shorter integration time
Property.
Quick beam smoothing method in ICF device proposed by the present invention based on light beam dynamic interference pattern can be used for directly
Driving and the ICF device driven indirectly, to improve the uniformity irradiated to target surface.
Quick beam smoothing method in ICF device proposed by the present invention based on light beam dynamic interference pattern can be used as existing
A kind of means of supplementing out economy of the even sliding technology of beam, further to improve target surface irradiation uniformity, especially in several picosecond time scales
Improve the medium-high frequency intensity modulated of focal spot, and a kind of potential technology approach for inhibiting laser-plasma interaction is provided.
To achieve the above object, the present invention is realized using the technical solution being made of following technical measures.
Design concept of the invention is: in the inertially confinement fusion device laser light bundle of Laser Driven, by each boundling
It is divided into the beamlet pair of combination of two, the operation wavelength of each pair of beamlet pair is different and insertion is a pair of respectively is conjugated phase board,
That is, its phase mehtod conjugation or complementary.Since operation wavelength is different, phase mehtod is conjugated or complementary, each pair of beamlet is to equal
Dynamic interference pattern is formed in far field, to simultaneously and dynamically change the position of speckle and intensity inside focal spot, and then realization pair
The quick even cunning of far-field focus.
In the design, light of each pair of beamlet after conjugation phase board, continuous phase plate and lens, in far field
Field distribution may be expressed as:
In formula, A (x, y)=A0exp[-(x2N+y2N)/w2N]eiφ(x,y)It is distributed for the Near-field optical field of beamlet, Φ (x, y)=-
Φ*(x, y) is the phase mehtod for being conjugated phase board, the working frequency of ω and ω ' respectively two beamlets, φCPPFor CPP antithetical phrase
The Spatial transmission of light beam, " FT " indicate Fourier transformation.
In time of integration Δ t, far-field intensity distribution are as follows:
In formula, Δ t is the time of integration, and " | | " indicates to take absolute value.
The phase mehtod of the phase board can be, but not limited to be inclined surface, cylinder, spherical surface and helicoid.
It the insertion position of the phase board, can be separately as the phase part of " plug and play " between the terminal assembly of far field
It is inserted between the terminal assembly of far field, can also combine with continuous phase plate and be processed into same phase part and be inserted into far field terminal
Between component, implementation flexibility and changeability.
The difference of the operation wavelength in 0.01nm between 1nm, to guarantee the coherence between beamlet simultaneously and make coke
Spot uniformity, which reaches, stablizes the required even sliding time in 40ps between 0.4ps.
Quick beam smoothing technology of the present invention based on beam interference pattern, can make laser beam speckle in cross
It is swept to, radial or directions such as angular, to realize the even cunning of laser beam focal spot in any direction.
Quick beam smoothing technology of the present invention based on beam interference pattern can also be such that laser beam dissipates simultaneously
Spot laterally, radially and angularly etc. the combination in directions sweep, to realize the multi-direction even cunning of laser beam focal spot simultaneously.
Possessed advantage and beneficial technical effect are as follows compared with prior art by the present invention.
1, present invention firstly provides in the Laser Driven system of inertially confinement fusion device based on dynamic interference pattern
Quick beam smoothing method realizes the multi-direction quickly even cunning of laser beam speckle.
2, the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern with
Existing one-dimensional SSD (1D-SSD) is compared, by making speckle inside focal spot laterally, radially and angularly etc. directions or combinations thereof are swept
It is dynamic, to be able to achieve the even cunning of far-field focus within the shorter time of integration, and laser beam can be effectively prevented from and generate item in far field
The intensity modulated of line shape.
3, the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern,
After combining with existing two dimension SSD (2D-SSD), CPP, it can significantly improve irradiation of the laser beam to target surface within a short period of time
Characteristic especially reduces the generation of focal spot medium-high frequency intensity modulated.
4, the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern, with
Existing SSD, radial even cunning are compared, by being inserted into the phase board method different with beamlet operation wavelength is made in far field terminal assembly
It realizes to the even cunning of far-field focus, meets the requirement of plug and play, implementation flexibility and changeability.
Detailed description of the invention
Fig. 1 is that the present invention realizes the quick beam smoothing side based on dynamic interference pattern in the inertially confinement fusion device
The schematic diagram of method, i.e., insertion element 2 can realize quick beam smoothing in laser light bundle.
Fig. 2 is in the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern
Phase board phase mehtod, wherein (a) be inclination position phase, (b) be cylinder position phase, (c) be spherical surface position phase, (d) be spiral position
Phase.
Fig. 3 is in the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern
Focal spot when without continuous phase plate, wherein (a) is the focal spot of existing 1D-SSD light beam, (b) is existed for quick beam smoothing scheme
The focal spot of different moments.
Fig. 4 is in the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern
There is focal spot when continuous phase plate, wherein (a) is the focal spot of existing 2D-SSD beam smoothing, is (b) the quick light of exclusive use
The focal spot of the even sliding method of beam, focal spot when (c) being used in combination for 2D-SSD and quick beam smoothing scheme.
Fig. 5 is in the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern
When having continuous phase plate, quick beam smoothing method, two kinds of beam smoothing schemes of 2D-SSD, 2D-SSD and quick beam smoothing side
Under case is used in combination (for tilting position phase), the luminous flux contrast of focal spot with time of integration Δ t change curve and
FOPAI curve.
Fig. 6 is the quick beam smoothing method in inertially confinement fusion device of the present invention based on dynamic interference pattern
(cylinder position phase) is used alone, 2D-SSD is used alone and the two is combined under three kinds of schemes, the luminous flux contrast of focal spot with
The change curve of the time of integration.
In figure, 1 laser light bundle, each beamlet of i, ii, iii, iv expression, 2 conjugation phase boards, 3 continuous phase plates, 4 pairs
Refracting prisms, 5 condenser lenses, 6 far field focal planes.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawing and with specific embodiment, it is necessary to indicated herein to be
The embodiment described is only intended to further describe of the invention, and is not meant to be to any of the scope of the present invention
It limits.
Embodiment 1
Conjugation phase board used is inclination phase board in the present embodiment, phase PV (peak-to-valley) value be 2 λ (λ=
351nm), bore is 372mm × 372mm.For reach with the comparable effect of 2D-SSD, make the inclination phase board of beamlet i and ii
It tilts in the x-direction, and tilts the inclination phase board of beamlet iii and iv in the y-direction.The work of each beamlet in laser light bundle
It is respectively λ as wavelengthi=λiii=351nm, λii=λivThe polarization state of=351.1nm, beamlet i and beamlet ii are that x line is inclined
The polarization state of vibration, beamlet iii and beamlet iv are y linear polarization.The time of integration is 10ps.
Fig. 2 gives the phase mehtod of conjugation phase board, can but be not limited to inclination position phase, cylinder position phase, spherical surface position phase
With helicoid position phase, the present embodiment is using the inclination position phase in (a).
For convenience of comparison, the quick beam smoothing method of embodiment 1 is compared with typical one-dimensional 1D-SSD, wherein
The parameter of 1D-SSD is according to document (S.Skupsky, R.W.Short, T.Kessler, et al..Improved laser beam
uniformity using the angular dispersion of frequency modulated
Light.J.Appl.Phys.66,3456 (1989)) it is chosen, i.e. the modulating frequency ω of Temporal Phase Modulationm=
2.5GHz, modulation depth are δ=12, and grating dispersion coefficient isThe work of each beamlet in boundling
It is respectively λ as wavelengthi=λiii=351nm, λii=λiv=351.1nm.
Fig. 3~Fig. 5 carries out the quick beam smoothing method in embodiment 1 to the improvement of far-field focus uniformity
It shows, result has absolutely proved the effective of the quick beam smoothing method of the present invention based on dynamic interference pattern in figure
Property, feasibility.
Shown in Fig. 3, when compared no continuous phase plate 3, the focal spot of 1D-SSD and quick even sliding method.Wherein, (a) is
The focal spot distribution of typical 1D-SSD, sweeping direction are the direction y；It (b) is quick beam smoothing method of the present invention
Focal spot distribution, shows as focal spot in the sweeping in the direction x and y.
Shown in Fig. 5, when compared continuous phase plate 3,2D-SSD, quickly even sliding method, 2D-SSD and quick even cunning side
The distribution of the focal spot under three kinds of schemes is used in combination in method.Wherein, (a) is the focal spot of 2D-SSD, and focal spot obtains even cunning in the direction x and y,
There are the intensity modulations of apparent striated；(b) focal spot obtained for quick beam smoothing method of the present invention, in x and y
Direction obtains even cunning, but apparent striated intensity modulated is not present；(c) it is used in combination for 2D-SSD and quick even sliding method
Focal spot, uniformity are greatly improved.It is worth noting that focal spot size and being not significantly changed.
For the improvement degree of quantitative analysis focal spot uniformity, commented using focal spot luminous flux contrast (Contrast)
Valence, focal spot luminous flux contrast is smaller to show that focal spot uniformity is better；Its formula is expressed as follows:
In formula, Ii,j(xf,yf) it is (xf,yf) light intensity at position；ImeanFor average intensity.
For the improvement degree of hot spot inside the even sliding technology focal spot of quantitative analysis beam, using Fractional Power
Above Intensity (FOPAI) curve is evaluated, and FOPAI curve shows the improvement of hot spot inside focal spot to moving to left
Better；Its formula is expressed as follows:
In formula, A is focal spot area, ImeanFor average intensity.
When the improvement degree of focal spot uniformity and internal hot spot carries out quantitative analysis, for 90% energy circle rate
Region is calculated.
Using formula (4), (5) calculate used continuous phase plate 3 when, only tilt position phase when, only 2D-SSD and inclination position
Under three kinds of schemes under phase+2D-SSD combination, the luminous flux contrast of focal spot with the time of integration changing rule, such as Fig. 5 (a)
It is shown；When having used continuous phase plate by calculating, when only tilting position phase, under only 2D-SSD and inclination position phase+2D- SSD is combined
Three kinds of schemes under, the FOPAI curve at time of integration Δ t=10ps, as shown in Fig. 5 (b).
Shown in Fig. 5, when having used continuous phase plate 3, when only tilting position phase, only 2D-SSD and inclination position phase+2D-SSD join
Focal spot uniformity changing rule under is different.
Shown in Fig. 5 (a), when only tilting position phase, luminous flux contrast is dropped rapidly to 0.55 or so, then keeps stablizing；
Only when 2D-SSD, the oscillation of luminous flux contrast is decreased below 0.55；When inclination position phase is used in combination with 2D-SSD, luminous flux pair
Rapider than degree to decline and tend towards stability, the even sliding effect of beam is greatly improved.
Shown in Fig. 5 (b), inclination position phase+2D-SSD is combined the FOPAI curve of lower focal spot to moving to left, and shows compared to other
Two kinds of beam smoothing schemes, focal spot inside hot spot significantly reduce, and the even sliding effect of beam is greatly improved.
Through the foregoing embodiment 1 and attached drawing displaying, show in inertially confinement fusion device of the present invention based on
The quick beam smoothing method of dynamic interference pattern can realize effective even cunning of target surface in time of integration 10ps.
Embodiment 2
Conjugation phase board used is cylinder phase board in the present embodiment, phase PV (peak-to-valley) value be 2 λ (λ=
351nm), bore is 372mm × 372mm.For reach with the comparable effect of 2D-SSD, make the cylinder phase board of beamlet i and ii
In the x-direction, make the cylinder phase board of beamlet iii and iv in the y-direction.The operation wavelength of each beamlet point in laser light bundle
It Wei not λi=λiii=351nm, λii=λivThe polarization state of=351.2nm, beamlet i and beamlet ii are x linear polarization, beamlet
The polarization state of iii and beamlet iv are y linear polarization.The time of integration is 5ps.Other operating procedures and operating process and embodiment
1 is identical, and the improvement of the far-field focus uniformity same as Example 1 to laser light bundle equally can be obtained.
It is calculated using formula (4), (5) when having used continuous phase plate 3, only when the phase of cylinder position, only 2D-SSD and cylinder position
Under three kinds of schemes under phase+2D-SSD combination, the luminous flux contrast of focal spot with the time of integration changing rule, such as Fig. 6 institute
Show.
Shown in Fig. 6, only when the phase of cylinder position, luminous flux contrast is dropped rapidly to 0.55 or so, then kept stable；
Only when 2D-SSD, the oscillation of luminous flux contrast is decreased below 0.55；When cylinder position phase is used in combination with 2D-SSD, luminous flux pair
Rapider than degree to decline and tend towards stability, the even sliding effect of beam is greatly improved.
Embodiment of the present invention only gives specific example application, but for being engaged in inertial confinement fusion Laser Driven
For systematic research personnel, it can also be designed according to the above enlightenment a variety of for the dry based on dynamic of inertially confinement fusion device
The quick beam smoothing method of pattern is related to, this is still considered being covered by among the present invention.
Claims (6)
1. based on the quick beam smoothing method of light beam dynamic interference pattern in a kind of inertially confinement fusion device, it is characterised in that
In the inertially confinement fusion device laser light bundle (set that boundling is multiple beamlets) of Laser Driven, each beamlet is passed through
It crosses identical continuous phase plate 3, Polarization Control control panel 4 and lens 5 and focuses to far field focal plane, by the way that boundling is divided into group two-by-two
The beamlet pair of conjunction, the continuous phase plate 3 and polarization control plate 4 that each pair of beamlet is passed through are identical, but operation wavelength is different
And it is inserted into a pair of of conjugate phase plate 2 respectively, it is realized by the dynamic interference pattern each between of beamlet in far field to laser light
The quick even cunning of beam far-field focus, to improve the uniformity of far-field focus in a shorter integration time.
2. quick beam smoothing method according to claim 1, it is characterised in that each pair of beamlet in laser light bundle
Operation wavelength is different and passes through the phase board 2 of conjugation.
3. quick beam smoothing method according to claim 1, it is characterised in that the phase mehtod of phase board can with but not
Be limited to be inclined surface, cylinder, spherical surface and helicoid, it can be achieved that laser beam speckle laterally, radially and angularly etc. directions or
The sweeping in a combination thereof direction, to quickly improve the uniformity of focal spot.
4. quick beam smoothing method according to claim 1, it is characterised in that by being inserted into position in far field terminal assembly
The phase-plate method different with beamlet operation wavelength is made is realized to the even cunning of far-field focus, and the requirement of plug and play is met, and is realized
Mode flexibility and changeability.
5. quick beam smoothing method according to claim 1, it is characterised in that focal spot uniformity reach stablize it is required
The even sliding time depends on the wavelength difference of sub-light interfascicular, and the wavelength difference of the sub-light interfascicular more big then even sliding time is shorter.
6. quick beam smoothing method according to claim 1, it is characterised in that guarantee the coherence between beamlet
With the uniformity of focal spot, make the operation wavelength difference between beamlet in 0.01nm between 1nm, then the required even sliding time exists
40ps is between 0.4ps.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110515216A (en) * | 2019-07-19 | 2019-11-29 | 四川大学 | It a kind of light intensity and polarizes atwirl light field and regulates and controls method |
| CN111221135A (en) * | 2020-03-19 | 2020-06-02 | 中国工程物理研究院激光聚变研究中心 | System and method for beam polarization smoothing |
| CN111736357A (en) * | 2020-06-24 | 2020-10-02 | 四川大学 | Light field regulation and control method for enabling speckles to randomly sweep at high speed and enabling polarization to rotate at high speed |
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