CN108901118A - Transparent target body positioning system and its localization method in a kind of lasing ion accelerator - Google Patents
Transparent target body positioning system and its localization method in a kind of lasing ion accelerator Download PDFInfo
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- CN108901118A CN108901118A CN201810725141.8A CN201810725141A CN108901118A CN 108901118 A CN108901118 A CN 108901118A CN 201810725141 A CN201810725141 A CN 201810725141A CN 108901118 A CN108901118 A CN 108901118A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H15/00—Methods or devices for acceleration of charged particles not otherwise provided for, e.g. wakefield accelerators
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The invention discloses transparent target body positioning system and its localization methods in a kind of lasing ion accelerator.The present invention uses illumination light, object of reference and imaging system, it first will be near transparent target body coarse positioning to ideal image plane, then object of reference is removed, transparent target body is accurately located at ideal image plane by the image of phase object on transparent target body, it finally recycles laser that the with a tight waist of super-Gaussian beam is moved on transparent target body, that is, realizes the coupling of beam target；The present invention makes transparent target body become the visible object of phase using the method defocused；Optical path of the present invention is simple and can efficiently realize precise positioning, helps preferably to carry out laser target shooting experiment.
Description
Technical field
The present invention relates to high energy particle acceleration techniques, and in particular to transparent target body positioning system in a kind of lasing ion accelerator
System and its localization method.
Background technique
From after chirped laser pulse amplifying technique (CPA) proposition, the peak power of laser is developed by leaps and bounds.The theory of relativity swashs
Light pulse (such as light intensity I > 2.14 × 1018W/cm2, wavelength X=800 μm) and it focuses on solid target, phase interaction occurs with target
With can produce high energy ion beam.The accelerating gradient of compact proton precessional magnetometer based on the construction of this principle adds compared to tradition
Big three magnitudes of fast device.The proton beam of acquisition has the features such as ultrashort pulsewidth, high brightness and small emittance, in warm density material,
Many aspects such as the injector of traditional accelerator and proton medical treatment have potential application prospect.
It studies most commonly used lasing ion acceleration mechanism and is called sheaths acceleration mechanism (Target Normal after target
Sheath Acceleration, TNSA).In the mechanism, the Scaling Law relational theory of proton beam ceiling capacity and laser intensity
Upper is Emax∝I1/2, wherein EmaxFor proton beam ceiling capacity, unit MeV；I is laser intensity, i.e. laser on unit area
Power, unit W/cm2.Extensive experiment shows that Scaling Law is E at short pulse (30~100fs)max∝I0.7-1,
Scaling Law is E in the case of long pulse (0.3~1.0ps)max∝I0.5.For generating another important acceleration of quasi- monoenergetic proton
Mechanism is known as optical pressure acceleration mechanism (Radiation Pressure Acceleration, RPA), its Scaling Law is theoretically
Emax∝I.The key for improving the highest energy of laser-driven proton beam is the laser pulse intensity on target body surface, it is directly relied on
In the accuracy of target body positioning.In order to increase the light intensity on target body surface, so that the ceiling capacity for accelerating proton beam out is improved,
It needs target body accurate movement to focal position of laser, this process is known as target body positioning.Be widely used in experiment small f number from
Axis paraboloidal mirror (Off-Axis Parabolic Mirror, OAP) is by laser beam tight focus to micron order focal spot.However, by
The laser for focusing on very little will lead to extremely short Rayleigh range, this just needs accurate target body to position.Many experiments have confirmed
Dependence of the proton energy to the relative position of target body and laser spot.For example, as the OAP for the use of f number being 2, target practice position
Setting 8 μm of offset can cause proton beam ceiling capacity to reduce 30%, and proton stream reduces by force about magnitude.
In the prior art, various transparent targets, such as plastics target, DLC film target, liquid crystal target and silicon nitride target, quilt
It is widely used in the Proton emission of Laser Driven.However, being accurately positioned transparent target by direct imaging method is usually to compare
Difficult.A solution before is to place visible oBject, such as dot or opaque coating figure on transparent target surface
Case, but it can make the production process of target more complicated.
Summary of the invention
For the above problems of the prior art, the invention proposes transparent target bodys in a kind of lasing ion accelerator
Positioning system and its localization method.
An object of the present invention is to provide transparent target body positioning systems in a kind of lasing ion accelerator.
Lasing ion accelerator targeting system includes：Laser, dielectric mirror, off-axis parabolic mirror, transparent target body and
Detector；Wherein, transparent target body is arranged on the supporting plate；Laser issues laser, after dielectric mirror reflects, by off axis paraboloid mirror
Reflecting mirror is reflected and is focused on transparent target body, and super-Gaussian beam is formed after focusing, and the forward position of laser makes target body surface generate electricity
From, form plasma, laser pulse and Plasma Interaction generate ion beam at transparent target body rear, ion beam into
Enter in the detector at rear and is detected.
Transparent target body positioning system includes in lasing ion accelerator of the invention：Lighting source, collimating mirror, object of reference,
Imaging system and three-dimensional mobile station；Wherein, imaging system includes object lens, beam splitting chip, imaging len, the first and second CCD cameras,
Position is arranged in relatively fixedly in three-dimensional mobile station；Transparent target body positioning system includes three phases：It is the coarse positioning stage, accurate
Positioning stage and optimization focal spot stage；In the coarse positioning stage, lighting source issues illumination light, and collimated mirror collimation penetrates medium
It propagates, reflected by off-axis parabolic mirror and is focused on object of reference along laser optical path after mirror, from the light of object of reference
Two beams are divided by beam splitting chip after object lens, wherein a branch of direction is constant, imaging amplification factor is reduced after imaging len, from
And expand visual field, and subsequently into the first CCD camera, another beam deflects 90 ° and is received by the second CCD camera, and first and second
Object of reference is imaged in CCD camera simultaneously, and the imaging amplification factor of the first CCD camera is small, and the visual field is bigger, from the first CCD camera
Find object of reference, by three-dimensional mobile station adjust imaging system position so that object of reference in the first CCD camera clearly at
Picture；Object of reference is removed, transparent target body is moved on the origin-location of object of reference, to keep transparent target body flat positioned at ideal image
Near face；In the stage of accurate positionin, lighting source issues illumination light, collimated mirror collimation, penetrates after dielectric mirror along laser light
Road is propagated, and is reflected by off-axis parabolic mirror and is focused on transparent target body, is gathered through the illumination light of transparent target body by object lens
It is defocused, it is received by the second CCD camera, by the image of the second CCD camera of observation, adjusts the front-rear position of transparent target body, so that
Transparent target body is positioned exactly at ideal image plane；In the optimization focal spot stage, transparent target body removes optical path, and laser issues laser,
After dielectric mirror reflects, is reflected by off-axis parabolic mirror and form super-Gaussian beam after focusing, super-Gaussian beam is through object lens
After focusing, received by the second CCD camera, by adjusting the posture of off-axis parabolic mirror, so that super-Gaussian beam is second
Received hot spot is held round in CCD camera and diameter reaches minimum, and laser beam waist also is located at ideal image plane；It again will be saturating
Bright target body puts back to the position after being accurately positioned, and laser beam waist is allowed to be overlapped with transparent target body, that is, realizes the coupling of beam target.
Dielectric mirror uses surface coating technique, there is it, with high reflectivity, to the light of other wavelength to laser wave
Higher transmissivity, penetrates illumination light.
Lighting source is wide spectrum light source, using one of LED light source, halogen lamp and incandescent lamp；Launch wavelength 400~
The illumination light of visible-range between 700nm.
Imaging len uses single or multiple lens combinations.
On the supporting plate, support plate is the plate of center aperture, and transparent target body is pasted onto support plate and opens for transparent target body setting
The edge in hole.
Support plate is fixed on spokelike disk, and disk is by repeatable accuracy<0.5 μm of sextuple regulating system is moved
It is dynamic, to adjust longitudinal separation and the inclination angle of transparent target body.Off-axis parabolic mirror setting is adjusted in another 6 DOF
In system, the posture for adjusting off-axis parabolic mirror includes three directions and three angles.
Three-dimensional mobile station includes three one-dimensional rectilinear translation platforms, controls the linear movement on tri- directions x, y and z respectively.
The amplification factor of object lens is between 40 times~100 times.
Transparent target body is the transparent membrane of the μ m thick of 1nm~100.
The present invention is suitable for common large-scale laser, and the main laser spot size scope of application is from 10mm~900mm.
It is another object of the present invention to provide transparent target body localization methods in a kind of lasing ion accelerator.
Transparent target body localization method, includes the following steps in lasing ion accelerator of the invention：
1) the coarse positioning stage：
Open lighting source, lighting source issues illumination light, collimated mirror collimation, penetrates after dielectric mirror along laser optical path
Propagate, reflected by off-axis parabolic mirror and focused on object of reference, from object of reference light after object lens by beam splitting
Piece is divided into two beams, wherein a branch of direction is constant, imaging amplification factor is reduced after imaging len, thus expand visual field,
Subsequently into the first CCD camera, another beam deflects 90 ° and is received by the second CCD camera, and the first and second CCD cameras are to object of reference
It is imaged simultaneously, the imaging amplification factor of the first CCD camera is small, and the visual field is bigger, finds object of reference from the first CCD camera, passes through
The position of three-dimensional mobile station adjustment imaging system, so that object of reference blur-free imaging in the first CCD camera；Object of reference is removed into light
Transparent target body is placed on object of reference origin-location by road, so that transparent target body is located near ideal image plane；
2) stage is accurately positioned：
Lighting source issues illumination light, and collimated mirror collimation is propagated after penetrating dielectric mirror along laser optical path, by throwing off axis
Parabolic mirror is reflected and is focused on transparent target body, through transparent target body illumination light focused by object lens after, by the 2nd CCD phase
Machine receives, and the phase object on transparent target body is imaged in the second CCD camera, by observing the image of the second CCD camera, adjusts transparent
The front-rear position of target body, so that transparent target body is positioned exactly at ideal image plane；
3) optimize the focal spot stage：
Transparent target body is removed into optical path, closes lighting source, opens laser, laser issues laser, anti-through dielectric mirror
After penetrating, is reflected by off-axis parabolic mirror and form super-Gaussian beam after focusing, super-Gaussian beam is after object lens focus, by
Two CCD cameras receive, by adjusting the posture of off-axis parabolic mirror, so that super-Gaussian beam connects in the second CCD camera
The hot spot of receipts is held round and diameter reaches minimum, i.e., laser beam waist also is located at ideal image plane, then transparent target body is put
The position after being accurately positioned in step 2) is set, laser beam waist is allowed to be overlapped with transparent target body, that is, realizes the coupling of beam target.
Wherein, in step 2), phase object on transparent target body is two concentric rings in the image of the second CCD camera, together
Thimble is annulus or elliptical ring, is two concentric annulus if transparent target body is without inclination angle, if transparent target body has inclination angle
For two concentric elliptical rings；Defocusing amount Δ f is the distance between transparent target body and ideal image plane, and stage packet is accurately positioned
Include high accuracy positioning and high speed positioning two ways：
A) high accuracy positioning：
The color depth of two concentric rings is observed and compares, if the color of inner ring determines defocusing amount than the depth of outer ring
Δ f is negative value, i.e., transparent target body is between object lens and ideal image plane, then by transparent target body far from object lens；If inner ring
Color is more shallow than outer ring, then determine defocusing amount Δ f for positive value, i.e., transparent target body farther out from object lens, in ideal image planar outboard,
Then by transparent target body close to object lens；Until the standard deviation of image is adjusted to minimum, then defocusing amount Δ f=0 at this time, transparent target body
It is positioned exactly at ideal image plane, realizes and is accurately positioned；
B) high speed positions：
The color depth of two concentric rings is observed and compares, if the color of inner ring determines defocusing amount than the depth of outer ring
Δ f is negative value, i.e., transparent target body is between object lens and ideal image plane, then by transparent target body far from object lens；If inner ring
Color is more shallow than outer ring, then determine defocusing amount Δ f for positive value, i.e., transparent target body farther out from object lens, in ideal image planar outboard,
Then by transparent target body close to object lens；It is linear according to the radius of outer ring and defocusing amount Δ f, according to outer ring radius r in image
It is quickly obtained defocusing amount Δ f, so that target body to be accurately moved to ideal image plane, realizes and is accurately positioned.
Advantages of the present invention：
The present invention uses illumination light, object of reference and imaging system, first that transparent target body coarse positioning is attached to ideal image plane
Closely, object of reference is then removed, transparent target body is accurately located at by ideal image plane by the image of phase object on transparent target body,
It finally recycles laser that the with a tight waist of super-Gaussian beam is moved on transparent target body, that is, realizes the coupling of beam target；The present invention uses
The method defocused makes transparent target body become the visible object of phase；Optical path of the present invention is simple and can efficiently realize precise positioning,
Help preferably to carry out laser target shooting experiment.
Detailed description of the invention
Fig. 1 is the schematic diagram of one embodiment of transparent target body positioning system in lasing ion accelerator of the invention；
Fig. 2 is the imaging system of one embodiment of transparent target body positioning system in lasing ion accelerator of the invention
Schematic diagram；
Fig. 3 is the light path principle figure of transparent target body positioning system in lasing ion accelerator of the invention, wherein (a) is
The light path principle figure in coarse positioning stage is (b) light path principle figure in accurate positionin stage, is (c) optical path in optimization focal spot stage
Schematic diagram；It (d) is the light path principle figure of target practice process；
Fig. 4 is that defocusing amount is shown in one embodiment of transparent target body positioning system in lasing ion accelerator of the invention
It is intended to, wherein (a) is light path principle figure, (b) is the image for the phase object that defocusing amount is -3 μm, (c) is the phase that defocusing amount is 0
Position object image, (d) be the phase object that defocusing amount is 3 μm image, (e) relational graph between standard deviation and defocusing amount；
Fig. 5 is for defocusing amount in one embodiment of transparent target body positioning system in lasing ion accelerator of the invention and outside
The schematic diagram of ring radius, wherein (a) is outer ring radius change situation of the tilt angle of transparent target body when being 0 ° and 15 °, (b)
(c) be respectively defocusing amount be -8 μm and 8 μm when phase object image.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
As shown in Figure 1, the lasing ion accelerator targeting system of the present embodiment includes：Laser, dielectric mirror M, off-axis throwing
Parabolic mirror OAP, transparent target body O and detector D；Transparent target body positioning system includes in lasing ion accelerator：Illumination light
Source SO, collimating mirror C, object of reference B, imaging system A and three-dimensional mobile station；Wherein, as shown in Fig. 2, imaging system is arranged in three-dimensional
In mobile station；Imaging system includes the relatively-stationary object lens L1 in position, beam splitting chip G, imaging len L2, the first and second CCD phases
Machine CCD1 and CCD2.
As shown in Fig. 2, the positional relationship of object lens and imaging len and amplification factor meet：Imaging required for first determining is put
Big multiple F1 and F2, wherein F1 is the imaging amplification factor of the first CCD camera, and F2 is the imaging times magnification of the second CCD camera
Number, determines object lens according to F2；The object lens determining for one, operating distance x0 and object lens to the 2nd CCD distance (x1+x2) all
It is definite value, wherein x1 is distance of the object lens to beam splitting chip, and x2 is distance of the beam splitting chip to the 2nd CCD.If the optical path for turning 90
Roll up and, the 2nd CDD is behind the first CCD, so the imaging for imaging len, the picture on the 2nd CCD calculates virtual object, there is virtual object
At the imaging relations of real image, away from being that beam splitting chip arrives the distance between imaging len for (x3-x2), image distance x4, x3, x4 is virtual object
For imaging len to the distance of the first CCD, what is be worth noting that be (x3-x2) is negative.Again by amplification factor of imaging len etc.
Compare object distance in image distanceDetermine image distance x4.BySo that it is determined that the focal length f of imaging len.For
Five variables of x1, x2, x3, x4 and f, do not uniquely determine, they meet above-mentioned relation, then by suitable experiment pendulum
Condition is put to determine.
In the present embodiment, lighting source uses LED；The central wavelength of laser is 800nm；Off-axis parabolic mirror
Focal length be 3.5；Transparent target body sticks together in the support plate of the square of diameter 2mm aperture, and support plate is fixed on a runner
On the disk of shape, by repeatable accuracy<0.5 μm of sextuple regulating system is moved；The imaging amplification factor of object lens is 50 times, number
Being worth aperture is 0.4；Imaging len uses achromatic lens.
Transparent target body localization method, includes the following steps in the lasing ion accelerator of the present embodiment：
1) the coarse positioning stage：
As shown in Fig. 3 (a), lighting source SO is opened, lighting source issues illumination light, and illumination light wavelength 532nm is collimated
Mirror C collimation, propagates along laser optical path after penetrating dielectric mirror M, is reflected by off-axis parabolic mirror OAP and focus on object of reference
On B, object of reference uses needle point, and illumination light enters imaging system A after needle point, focused by object lens, and amplification factor 50, illumination is imaged
Light is divided into two beams after object lens, by beam splitting chip, wherein a branch of direction is constant, it is 10 that amplification factor is imaged after imaging len,
To expanding visual field, subsequently into the first CCD camera, another beam deflects 90 ° and is received by the second CCD camera, and first and the
Object of reference is imaged in two CCD cameras simultaneously, and the amplification factor of the first CCD camera is small, and the visual field is bigger, seeks from the first CCD camera
Object of reference is looked for, the position of imaging system is adjusted by three-dimensional mobile station, so that object of reference blur-free imaging in the first CCD camera；
Object of reference B is removed into optical path, transparent target body O is placed on object of reference origin-location so that transparent target body be located at it is ideal at
As near plane.
2) stage is accurately positioned：
As shown in Fig. 3 (b), lighting source SO issues illumination light, collimated mirror C collimation, penetrates after dielectric mirror along laser
Paths are reflected by off-axis parabolic mirror OAP and are focused on transparent target body, through transparent target body O illumination light by
It after object lens focus, is received by the second CCD camera, the phase object on transparent target body is imaged in the second CCD camera, passes through observation second
The image of CCD camera adjusts the front-rear position of transparent target body, so that transparent target body is positioned exactly at ideal image plane：
A) high accuracy positioning：
The color depth of two concentric rings is observed and compared, the position of transparent target body is accordingly adjusted, if the color of inner ring
Than the depth of outer ring, then defocusing amount Δ f is determined for negative value, i.e., transparent target body, then will be transparent between object lens and ideal image plane
Target body is far from object lens；If the color of inner ring is more shallow than outer ring, defocusing amount Δ f is determined for positive value, i.e., transparent target body is from object lens
Farther out, in ideal image planar outboard, then by transparent target body close to object lens；Until the standard deviation of image is modulated it is minimum, then this
When defocusing amount Δ f=0, transparent target body is positioned exactly at ideal image plane, realizes and be accurately positioned；Fig. 4 (b), (c) and (d) are opened up
Image of the transparent target body when defocusing amount is respectively -3 μm, 0 μm and 3 μm is shown.Hi-vision contrast corresponds to the big of pixel value
Standard deviation calculates the standard deviation of image pixel value, can carry out the differentiation of the point on quantitatively characterizing target.The point observed in the picture
Appearance and variation can be explained by using the angle distribution profile that Fourier Optics analyzes transmitted light.Fig. 4 (e) illustrates target body
When tilt angle is respectively 0 ° and 15 °, the relationship between standard deviation and defocusing amount.Here target body inclination angle is that laser pulse is opposite
In the incidence angle of target normal.As defocusing amount Δ f=0, standard deviation obtains minimum value, and the image of point is almost invisible.Pass through
Mobile target body front-rear position keeps the standard deviation of image minimum, can be realized the accurate positioning to target body.
B) high speed positions：
The color depth of two concentric rings is observed and compares, if the color of inner ring determines defocusing amount than the depth of outer ring
Δ f is negative value, i.e., transparent target body is between object lens and ideal image plane, then by transparent target body far from object lens；If inner ring
Color is more shallow than outer ring, then determine defocusing amount Δ f for positive value, i.e., transparent target body farther out from object lens, in ideal image planar outboard,
Then by transparent target body close to object lens；The radius of outer ring and defocusing amount Δ f are linear, quick according to outer ring radius r in image
Defocusing amount Δ f is obtained, so that target body to be accurately moved to ideal image plane, realizes and is accurately positioned.As shown in figure 5, at 15 °
In the case of, concentric ring becomes elliptical ring, the outer ring radius r in the semi-major axis corresponding diagram 5 of elliptical ring.Change in wider defocusing amount
In range, outer ring radius r keeps linear relationship with defocusing amount Δ f.
3) optimize the focal spot stage：
As shown in Fig. 3 (c), transparent target body is removed into optical path, closes lighting source, open laser, laser, which issues, to swash
Light is reflected by off-axis parabolic mirror OAP after dielectric mirror M reflection and forms super-Gaussian beam after focusing, and is into imaging
Unite A, and super-Gaussian beam is received after object lens focus by the second CCD camera, by adjusting the posture of off-axis parabolic mirror,
So that super-Gaussian beam received hot spot in the second CCD camera is held round and diameter reaches minimum, laser beam waist also position
Be placed on the position after being accurately positioned in step 2) in ideal image plane, then by transparent target body, allow the with a tight waist of laser beam with
Transparent target body is overlapped, that is, realizes the coupling of beam target.
The accuracy of positioning system is by object lens depth of field bring optical system accuracy and sextuple adjusting after target of the invention
The repeatable accuracy (0.5 μm of <) of system codetermines.For the present invention, by taking the illumination light wavelength 532nm used when positioning as an example,
The object lens depth of field is λ/(2NA2)=1.7 μm.Therefore when not considering full power laser spot position drift, positioning system after target
Precision existWithin.It is worth noting that, the incidence angle of laser is to oval the half of phase object image
Long axis has little effect.
After the positioning of transparent target body, i.e. super-Gaussian beam it is with a tight waist be overlapped with transparent target body after, carry out target practice process, such as Fig. 3
(d) shown in, laser sending laser, central wavelength 800nm, after dielectric mirror M reflection, the off-axis parabolic for being 3.5 by focal length
Face reflecting mirror OAP is reflected and is focused on transparent target body O, and laser spot size is focused into 5 μm by 80mm, and Rayleigh is formed after focusing
Length is equal to 41 μm of super-Gaussian beam, and the forward position of laser makes target body surface generate ionization, forms plasma, laser main pulse
With Plasma Interaction, ion beam is generated at transparent target body rear, ion beam, which enters in the detector at rear, to be detected.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that：Without departing from the spirit and scope of the invention and the appended claims, various to replace and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (10)
1. transparent target body positioning system in a kind of lasing ion accelerator, lasing ion accelerator targeting system include：Laser,
Dielectric mirror, off-axis parabolic mirror, transparent target body and detector；Wherein, transparent target body is arranged on the supporting plate；Laser hair
Laser out is reflected by off-axis parabolic mirror and is focused on transparent target body, form superelevation after focusing after dielectric mirror reflects
This light beam, the forward position of laser make target body surface generate ionization, form plasma, laser pulse and Plasma Interaction,
Ion beam is generated at transparent target body rear, ion beam, which enters in the detector at rear, to be detected, which is characterized in that the transparent target
Body positioning system includes：Lighting source, collimating mirror, object of reference, imaging system and three-dimensional mobile station；Wherein, the imaging system
Including object lens, beam splitting chip, imaging len, the first and second CCD cameras, position is arranged in relatively fixedly in three-dimensional mobile station；
The transparent target body positioning system includes three phases：Stage and optimization focal spot stage is accurately positioned in the coarse positioning stage；Slightly fixed
Position stage, lighting source issue illumination light, and collimated mirror collimation is propagated after penetrating dielectric mirror along laser optical path, by throwing off axis
Parabolic mirror is reflected and is focused on object of reference, and the light from object of reference is divided into two beams by beam splitting chip after object lens,
In a branch of direction it is constant, after imaging len reduce imaging amplification factor, to expand visual field, subsequently into first
CCD camera, another beam deflect 90 ° and are received by the second CCD camera, and object of reference is imaged in the first and second CCD cameras simultaneously, and first
The imaging amplification factor of CCD camera is small, and the visual field is bigger, finds object of reference from the first CCD camera, is adjusted by three-dimensional mobile station
The position of imaging system, so that object of reference blur-free imaging in the first CCD camera；Object of reference is removed, transparent target body is moved to
On the origin-location of object of reference, so that transparent target body be made to be located near ideal image plane；In the stage of accurate positionin, lighting source
Illumination light is issued, collimated mirror collimation is propagated after penetrating dielectric mirror along laser optical path, simultaneously by off-axis parabolic mirror reflection
Focus on transparent target body, through transparent target body illumination light focused by object lens after, by the second CCD camera receive, pass through observation
The image of second CCD camera adjusts the front-rear position of transparent target body, so that transparent target body is positioned exactly at ideal image plane；?
Optimize the focal spot stage, transparent target body removes optical path, and laser issues laser and reflected after dielectric mirror reflects by off axis paraboloid mirror
Mirror reflects and forms super-Gaussian beam after focusing, and super-Gaussian beam is received by the second CCD camera after object lens focus, passes through tune
The posture of whole off-axis parabolic mirror so that super-Gaussian beam received hot spot in the second CCD camera be held round and
Diameter reaches minimum, and laser beam waist also is located at ideal image plane；Transparent target body is put back into the position after being accurately positioned again, is allowed sharp
Beam waist is overlapped with transparent target body, that is, realizes the coupling of beam target.
2. transparent target body positioning system as described in claim 1, which is characterized in that the lighting source is wide spectrum light source, is adopted
With one of LED light source, halogen lamp and incandescent lamp；The illumination light of launch wavelength visible-range between 400~700nm.
3. transparent target body positioning system as described in claim 1, which is characterized in that the imaging len is using single or multiple
Lens combination.
4. transparent target body positioning system as described in claim 1, which is characterized in that the transparent target body is arranged in support plate
On, support plate is the plate of center aperture, and transparent target body is pasted onto the edge of support plate aperture.
5. transparent target body positioning system as described in claim 1, which is characterized in that the support plate is fixed on spokelike circle
On disk, disk is moved by sextuple regulating system, to adjust longitudinal separation and the inclination angle of transparent target body.
6. transparent target body positioning system as described in claim 1, which is characterized in that the three-dimensional mobile station includes three one-dimensional
Rectilinear translation platform controls the linear movement on tri- directions x, y and z respectively.
7. transparent target body positioning system as described in claim 1, which is characterized in that the amplification factor of the object lens 40~
Between 100 times.
8. transparent target body positioning system as described in claim 1, which is characterized in that close the position of the object lens and imaging len
System meets with amplification factor：Amplification factor F1 and F2 are imaged required for determining, object lens are determined according to F2；By putting for imaging len
Big multiple is equal to image distance and compares object distanceDetermine image distance x4；BySo that it is determined that the coke of imaging len
Away from, wherein F1 is the imaging amplification factor of the first CCD camera, and F2 is the imaging amplification factor of the second CCD camera, and x1 is object lens
To the distance of beam splitting chip, x2 is distance of the beam splitting chip to the 2nd CCD, and x3 is that beam splitting chip arrives the distance between imaging len, and x4 is
Distance of the imaging len to the first CCD.
9. transparent target body localization method in a kind of lasing ion accelerator as described in claim 1, which is characterized in that described
Bright target body localization method：
1) the coarse positioning stage：
Lighting source is opened, lighting source issues illumination light, and collimated mirror collimation passes after penetrating dielectric mirror along laser optical path
Broadcast, reflected by off-axis parabolic mirror and focused on object of reference, from object of reference light after object lens by beam splitting chip
It is divided into two beams, wherein a branch of direction is constant, imaging amplification factor is reduced after imaging len, to expand visual field, so
Enter the first CCD camera afterwards, another beam deflects 90 ° and received by the second CCD camera, and the first and second CCD cameras are same to object of reference
When be imaged, the imaging amplification factor of the first CCD camera is small, and the visual field is bigger, finds object of reference from the first CCD camera, passes through three
The position for tieing up mobile station adjustment imaging system, so that object of reference blur-free imaging in the first CCD camera；Object of reference is removed into light
Transparent target body is placed on object of reference origin-location by road, so that transparent target body is located near ideal image plane；
2) stage is accurately positioned：
Lighting source issues illumination light, and collimated mirror collimation is propagated after penetrating dielectric mirror along laser optical path, by off axis paraboloid mirror
Reflecting mirror is reflected and is focused on transparent target body, through transparent target body illumination light focused by object lens after, connect by the second CCD camera
It receives, the phase object on transparent target body is imaged in the second CCD camera, by observing the image of the second CCD camera, adjusts transparent target body
Front-rear position so that transparent target body is positioned exactly at ideal image plane；
3) optimize the focal spot stage：
Transparent target body is removed into optical path, closes lighting source, opens laser, laser issues laser, after dielectric mirror reflects,
It is reflected by off-axis parabolic mirror and forms super-Gaussian beam after focusing, super-Gaussian beam is after object lens focus, by the 2nd CCD
Camera receives, by adjusting the posture of off-axis parabolic mirror, so that super-Gaussian beam received light in the second CCD camera
Spot is held round and diameter reaches minimum, i.e., laser beam waist also is located at ideal image plane, then transparent target body is placed on step
Position after rapid 2) middle accurate positionin, allows laser beam waist to be overlapped with transparent target body, that is, realizes the coupling of beam target.
10. transparent target body localization method as claimed in claim 9, which is characterized in that wherein, in step 2), on transparent target body
Phase object the second CCD camera image be two concentric rings, concentric ring be annulus or elliptical ring, if transparent target body is without inclination
Angle is then two concentric annulus, is two concentric elliptical rings if transparent target body has inclination angle；Defocusing amount Δ f is transparent target
The distance between body and ideal image plane, accurate positionin stage include high accuracy positioning and high speed positioning two ways：
A) high accuracy positioning：
The color depth of two concentric rings is observed and compares, if the color of inner ring than the depth of outer ring, determines that defocusing amount Δ f is
Negative value, i.e., transparent target body is between object lens and ideal image plane, then by transparent target body far from object lens；If the color ratio of inner ring
Outer ring it is shallow, then determine defocusing amount Δ f for positive value, i.e., transparent target body farther out from object lens, then will be saturating in ideal image planar outboard
Bright target body is close to object lens；Until the standard deviation of image is adjusted to minimum, then defocusing amount Δ f=0 at this time, the transparent accurate position of target body
In imaging plane, realizes and be accurately positioned；
B) high speed positions：
The color depth of two concentric rings is observed and compares, if the color of inner ring than the depth of outer ring, determines that defocusing amount Δ f is
Negative value, i.e., transparent target body is between object lens and ideal image plane, then by transparent target body far from object lens；If the color ratio of inner ring
Outer ring it is shallow, then determine defocusing amount Δ f for positive value, i.e., transparent target body farther out from object lens, then will be saturating in ideal image planar outboard
Bright target body is close to object lens；It is linear according to the radius of outer ring and defocusing amount Δ f, it is quickly obtained according to outer ring radius r in image
Defocusing amount Δ f is obtained, so that target body is accurately moved to imaging plane, realizes and is accurately positioned.
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