CN206362931U - The probe light homogenising system of any reflecting surface velocity interferometer - Google Patents
The probe light homogenising system of any reflecting surface velocity interferometer Download PDFInfo
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Abstract
In order to solve the homogeneity question of VISAR probe optical illumination, the utility model provides a kind of probe light homogenising system of any reflecting surface velocity interferometer, including optical fiber output laser, collimation camera lens and beam-shrinked mirror；Collimation camera lens is arranged on the output light path of optical fiber output laser, and collimates the focal plane of camera lens at the fiber end face of optical fiber output laser；Beam-shrinked mirror includes group and group after beam-shrinked mirror before beam-shrinked mirror；Group is arranged on the output light path of collimation camera lens before beam-shrinked mirror；Group is arranged on the output light path organized before beam-shrinked mirror after beam-shrinked mirror, and group and the focal plane organized after beam-shrinked mirror are overlapped before beam-shrinked mirror, constitute Kepler telescope structure.The optical fiber core diameter D of the fiber end face0, collimation camera lens focal length f1, the focal length f that organizes before beam-shrinked mirror2With the focal length f organized after beam-shrinked mirror3Meet relation：In formula, α is the outgoing half-angle of the fiber end face outgoing beam；f2>f1>5mm。
Description
Technical field
The utility model belongs to technical field of laser detection, is related to a kind of probe light of any reflecting surface velocity interferometer
Homogenising system.
Background technology
Any reflecting surface velocity interferometer (Velocity Interferometer System for Any
Reflector, abbreviation VISAR) be it is a kind of based on light surface of moving object reflection produce doppler shift effect tested the speed,
Active, high-space resolution velocity interferometer with probe light.At home and abroad VISAR be widely used in inertial confinement core gather
Become the research of (ICF), be the most important wave profile test equipment grown up in nearest decades, can be used for material high pressure
State equation experiment, material property experiment, impact characteristics Rayleigh-Taylor's experiment, shaping pulse experiment etc..
VISAR probe light uses the laser of certain wavelength, and the probe laser beam system is generally by laser, output light
Fibre, this four part of light beam pre-shaped light path, probe formation light path are constituted.For optical imagery relational angle, output optical fibre
Terminal surface is " object plane ", and light beam pre-shaped light path and probe formation light path collectively form an imaging lens, by the target surface of searchlighting
For " image planes ".In other words, light beam pre-shaped light path and the probe imaging lens that collectively form of formation light path by " fiber end face " into
As at " target surface " place, " fiber end face " and " target surface " has Nonimage Conjugate Relations.Thus, if it is desired to " target surface " is uniformly lighted,
It must be equally distributed at " fiber end face " then to require laser.
However, from the point of view of in the world, the illumination uniformity of VISAR probe lights is always a key for perplexing scientific research personnel
Problem.Scientific research personnel has attempted many kinds of solutions, but fails to obtain more satisfactory effect always.
The U.S. substantially experienced two stages in the solution of the problem：First stage, significantly extended fiber length；Second
In the stage, illuminated simultaneously using multifiber.But effect is not very good：In the first phase, they are by expensive core diameter
Length for φ 1mm specialty optical fiber increases to 30m, fully reflects, mixes in a fiber to light, plays homogenization.
But, the reflection of each light in a fiber be all it is periodic, therefore light beam whole structure be also it is periodic, simply
Ground increase fiber lengths homogenize effect expected from not reaching；(the side that i.e. present U.S. NIF devices are being applied in second stage
Case), three core diameters are lined up triangle disposition by them for φ 1mm close fiber optic, and " target surface " is illuminated simultaneously with three optical fiber, to
Make the interlaced superposition of three illumination spots at " target surface " place, improve the uneven situation of " target surface " illumination.The method has certain
Homogenize effect, but its improvement is extremely limited very little due to fiber count, moreover this method causes illumination spot to disperse, and causes
" target surface " laser energy density is greatly reduced, and the utilization rate of laser energy declines to a great extent.
The country substantially also experienced two stages in the solution of the problem：First stage, optical fiber is equally significantly increased long
Degree；Second stage, optical defocus.Wherein, optical defocus refers to the axial location by changing fiber end face, breaks " optical fiber
The Nonimage Conjugate Relations of end face " and " target surface ", so just cannot get the sharply defined image of " fiber end face " at " target surface " place, that is, obtain
It is fuzzy picture, is exactly based on this obfuscation mode, effect is homogenized to obtain.But, if obfuscation is serious, really may be used
With play it is certain homogenize effect, but defocus after illumination spot can significantly increase, cause the capacity usage ratio of laser drastically to drop
It is low.
Utility model content
In order to solve the homogeneity question of VISAR probe optical illumination, the utility model proposes a kind of any reflecting surface
The probe light homogenising system of velocity interferometer.
The utility model is recombinated by a set of special optical system to the structure of the outgoing beam of " fiber end face ",
And form a hot spot distribution definitely homogenized " virtual fiber end face ", original light is substituted with this " virtual fiber end face "
Fine end face, so that " virtual fiber end face " and " target surface " formation Nonimage Conjugate Relations.The utility model can both have been obtained definitely
Light spot homogenizing effect, lighting area size again it is controllable, can also make full use of laser power.
The technical solution of the utility model is：
The probe light homogenising system of any reflecting surface velocity interferometer includes optical fiber output laser；Its special character exists
In：The homogenising system also includes collimation camera lens and beam-shrinked mirror；The collimation camera lens is arranged on the output light path of optical fiber laser
On, and the focal plane of camera lens is collimated at the fiber end face of optical fiber output laser；The beam-shrinked mirror includes group before beam-shrinked mirror
With group after beam-shrinked mirror；Group is arranged on the output light path of collimation camera lens before beam-shrinked mirror；Group is arranged on group before beam-shrinked mirror after beam-shrinked mirror
Output light path on, and the focal plane organized is overlapped after group and beam-shrinked mirror before beam-shrinked mirror, constitutes Kepler telescope structure；
To ensure that spot size, numerical aperture are identical with fiber end face 1 at virtual fiber end face 6, the optical fiber
The optical fiber core diameter D of end face0, collimation camera lens focal length f1, the focal length f that organizes before beam-shrinked mirror2With the focal length f organized after beam-shrinked mirror3Meet such as
Lower relation：
In formula, α is the outgoing half-angle of the fiber end face outgoing beam；f1And f2It is preset value, f2>f1>5mm；
The exit pupil position of homogenising system is on the virtual fiber end face after homogenizing, the fiber end face of optical fiber output laser
The collimated camera lens of light beam and beam-shrinked mirror of every bit outgoing are exported after uniformly deploying and be layering from the virtual fiber end face.
To remove High-frequency Interference, acquisition more preferably homogenizes effect, is organized after group and beam-shrinked mirror before the above-mentioned beam-shrinked mirror
Filtering hole is provided with intermediate image plane (at the image planes that imaging is organized i.e. before the collimated camera lens of fiber end face and beam-shrinked mirror).
More easily to determine the position of virtual fiber end face, it is provided with above-mentioned collimation camera lens at diaphragm, diaphragm and is
The entrance pupil position of homogenising system, the exit pupil position of homogenising system is the virtual fiber end face after homogenizing.
The utility model additionally provide it is a kind of homogenized method is carried out to probe light using above-mentioned homogenising system, its it is special it
It is in comprising the following steps：
(1) collimated using collimation camera lens to putting sent light beam from each on fiber end face
(2) output beam of collimation camera lens in step (1) is focused using group before beam-shrinked mirror；
(3) output beam organized before beam-shrinked mirror in step (2) is collimated again using group after beam-shrinked mirror, it is common according to image
Yoke relation, the exit pupil position of homogenising system is the virtual fiber end face after homogenizing.
The hot spot of virtual fiber end face can be interfered in view of high frequency light, filter can be used before above-mentioned steps (3)
Radio-frequency component in light beam is first filtered out and more preferably homogenizes effect to obtain by wave hole.Filtering hole is arranged in the beam-shrinked mirror
Between image planes position, i.e., the image planes of imaging are organized before the collimated camera lens of fiber end face and beam-shrinked mirror of described optical fiber output laser
Place.
The utility model homogenizes light path using collimator objective and beam-shrinked mirror composition, by " the optical fiber end of optical fiber output laser
Face " each point hot spot deploy and be layering, just can be formed relative to " former fiber end face " (optical fiber output laser
Fiber end face) numerical aperture is constant, spot diameter is constant, hot spot distribution is absolute homogenized " virtual fiber end face ".
The utility model has the advantages that：
1st, effect is homogenized good
Hot spot on the utility model " virtual fiber end face " is that each point hot spot uniformly deploys on " former fiber end face "
The result being layering again, no matter the hot spot on former fiber end face how skewness, the hot spot on " virtual fiber end face "
Distribution can almost reach absolute uniform；With the setting by each optical component parameter relation and position relationship, it is ensured that " empty
The spot size and numerical aperture of plan fiber end face " are identical with " former fiber end face ".
2nd, beam-shrinked mirror of the present utility model is using the structure type for having intermediate image plane, and the setting filtering hole in intermediate image plane
To filter out the radio-frequency component in laser, High-frequency Interference is removed, is conducive to reaching and more preferably homogenizes effect.
3rd, applicability is good
The utility model does not change VISAR existing " light beam pre-shaped light path " and " probe formation light path ", only need to be in light
Fine front end adds and homogenizes light path, is substituted former " fiber end face " with " virtual fiber end face ".Therefore, to existing VISAR liter
Level transformation is very convenient.
Brief description of the drawings
Fig. 1 is principle schematic diagram of the present utility model；
Fig. 2 homogenizes effect diagram to be of the present utility model.
Wherein：1- fiber end faces；2- collimates camera lens；Group before 3- beam-shrinked mirrors；4- filters hole；Group after 5- beam-shrinked mirrors；6- is virtual
Fiber end face.
Embodiment
The utility model is further described with reference to the accompanying drawings and detailed description.
As shown in figure 1, the probe light homogenising system bag of any reflecting surface velocity interferometer provided by the utility model
Include optical fiber output laser, collimation camera lens 2 and by organizing the beam-shrinked mirror that group 5 is constituted after 3 and beam-shrinked mirror before beam-shrinked mirror.
Collimation camera lens 2 is arranged on the output light path of optical fiber output laser, and collimates the focal plane of camera lens 2 positioned at optical fiber
At the fiber end face 1 of output laser.Group 3 is arranged on the output light path of collimation camera lens 2 before beam-shrinked mirror；Group 5 is set after beam-shrinked mirror
Put before beam-shrinked mirror on the output light path of group 3；The focal plane that group 5 after 3 and beam-shrinked mirror is organized before beam-shrinked mirror is overlapped, and is constituted Kepler and is looked in the distance
Mirror structure.
To ensure that spot size, numerical aperture are identical with fiber end face 1 at virtual fiber end face 6, fiber end face 1
Optical fiber core diameter D0, collimation camera lens 2 focal length f1, before beam-shrinked mirror group 3 focal length f2With the focal length f of group 5 after beam-shrinked mirror3Meet such as
Lower relation：
In formula, α is the outgoing half-angle of the fiber end face outgoing beam；f1And f2It is preset value, f2>f1>5mm。
To remove High-frequency Interference, acquisition more preferably homogenizes effect, is organized before beam-shrinked mirror after 3 and beam-shrinked mirror in group 5
Between filtering hole 4 is provided with image planes (at the image planes that 3 imagings are organized before the collimated camera lens 2 of fiber end face 1 and beam-shrinked mirror).
More easily to determine the position of virtual fiber end face 6, be provided with collimation camera lens 2 at diaphragm, diaphragm (namely
Collimate camera lens 2 at) be homogenising system entrance pupil position, the exit pupil position of homogenising system (entrance pupil and emergent pupil are Nonimage Conjugate Relations)
Virtual fiber end face after as homogenizing.In other words, emergent pupil is that entrance pupil group 5 after the group 3 before beam-shrinked mirror and beam-shrinked mirror is constituted
Beam-shrinked mirror imaging, the position of the picture is the position of virtual fiber end face 6.
Homogenising system provided by the utility model is by each light beam for sending of point on fiber end face 1 with special diameter
The directional light of (diameter is by the shrink beam of beam-shrinked mirror than controlling) is from the outgoing of virtual fiber end face 6.Light on virtual fiber end face 6
Spot is the result that each point hot spot uniformly deploys and is layering on fiber end face 1, and no matter the hot spot on fiber end face 1 is distributed
How uneven, the hot spot distribution on virtual fiber end face 6 can almost reach absolute uniform.
The utility model additionally provides one kind and carries out homogenized method to probe light using foregoing homogenising system, including following
Step：
(1) sent light beam is put using each of 2 pairs of camera lens of collimation from fiber end face 1 to collimate；
(2) it is focused using the output beam of collimation camera lens 2 in 3 pairs of steps (1) of group before the beam-shrinked mirror of long-focus；
(3) collimated again using the output beam of group 3 before beam-shrinked mirror in 5 pairs of steps (2) of group after the beam-shrinked mirror of short focus,
According to Nonimage Conjugate Relations, the exit pupil position of homogenising system is the virtual fiber end face 6 after homogenizing.
The hot spot of virtual fiber end face can be interfered in view of high frequency light, the utility model above-mentioned steps (3) it
Preceding first filtered out the radio-frequency component in light beam using filtering hole 4 more preferably homogenizes effect to obtain.The utility model will be filtered
Hole 4 is arranged on the image planes that 3 imagings are organized before the collimated camera lens 2 of the intermediate image position of beam-shrinked mirror, i.e. fiber end face 1 and beam-shrinked mirror
Place.
The utility model is using collimator objective 2 and beam-shrinked mirror composition homogenising system, by the light of each point of fiber end face 1
Spot deploys and is layering, and just can form hot spot distribution definitely homogenized virtual fiber end face 6, and virtual fiber end face 6
Numerical aperture and spot diameter are equal to the numerical aperture and spot diameter of fiber end face 1.
With reference to specific embodiment is to optical parametric of the present utility model and homogenizes effect and is further described.
Embodiment：
The light beam for the numerical aperture NA=0.27 that Fig. 2 sends for the central point of fiber end face 1 is obtained after homogenising system
The effect diagram of a diameter of φ 1mm collimated light beam.Each parameter in Fig. 2 is：
f1The focal length of-collimation camera lens 2；
d1Spacing before-collimation camera lens 2 and beam-shrinked mirror between group 3；
f2The focal length of group 3 before-beam-shrinked mirror；
f3The focal length of group 5 after-beam-shrinked mirror；
d2The distance between 5 and virtual fiber end face 6 are organized after-beam-shrinked mirror；
The numerical aperture of light beam at NA- fiber end faces 1；
The numerical aperture of light beam at NA'- virtual fibers end face 6；
α is the outgoing half-angle of the outgoing beam of fiber end face 1；
NA'=NA=sin α；
D1- collimated camera lens 2 collimate after beam size；
D2The diameter in-filtering hole 4；
D3Beam size at-virtual fiber end face 6.
The light beam for the numerical aperture NA=0.27 that each point of fiber end face 1 is sent homogenizes effect such as after homogenising system
Shown in Fig. 2, from Figure 2 it can be seen that homogenising system by the light beam of the every bit outgoing of fiber end face 1 all with a diameter of φ 1mm directional light
From the numerical aperture NA'=0.27 of light beam at the outgoing of virtual fiber end face 6, virtual fiber end face 6.
The hot spot of virtual fiber end face 6 is the knot that each point hot spot uniformly deploys, is layering again on fiber end face 1
Really.No matter how uneven hot spot distribution is on fiber end face 1, and the hot spot distribution on virtual fiber end face 6 can almost reach absolutely
To it is uniform.
In homogenising system, the focal length f of camera lens 2 is collimated1Determine through the beam size D after its collimation1,
D1=2*f1* tan α=2f1* tan (arcsin0.27) (formula 2)
It can be seen that, collimate the focal length f of camera lens 21Beam size D after collimation1It is proportional.Because whole homogenising system finally will
Obtain D3=1mm virtual fiber end face 6, thus the shrink beam ratio of beam-shrinked mirror is
D1:D3=D1:1=2f1*tan(arcsin0.27):1=2f1* tan (arcsin0.27) (formula 3)
It can be seen that, collimate the focal length f of camera lens 21The shrink beam ratio of beam-shrinked mirror is determined simultaneously.
After the shrink beam ratio of beam-shrinked mirror is determined, then the ratio between focal length of group 5 after 3 and beam-shrinked mirror is organized before beam-shrinked mirror true therewith
It is fixed, because the shrink beam ratio of beam-shrinked mirror is simultaneously equal to f2:f3.Therefore it can obtain,
f2:f3=2f1* tan (arcsin0.27) (formula 4)
The intermediate image position that hole 4 is located at beam-shrinked mirror is filtered, it is with fiber end face 1 into Nonimage Conjugate Relations, intermediate image plane
It is that 3 imagings are organized before the collimated camera lens 2 of fiber end face 1 and beam-shrinked mirror, image planes size (collimates camera lens 2 and contracting with two camera lenses
Shu Jingqian groups 3) focal length it is relevant, filter hole 4 diameter
D2=f2:f1(formula 5)
Spacing d before the position of virtual fiber end face 6 and collimation camera lens 2 and beam-shrinked mirror between group 31, group 3 before beam-shrinked mirror
Focal length f2, after beam-shrinked mirror group 5 focal length f3There is relation.Because virtual fiber end face 6 is located at the exit pupil position of homogenising system, and
The entrance pupil of homogenising system is on collimating mirror 2, and entrance pupil and emergent pupil are Nonimage Conjugate Relations.In other words, emergent pupil is that entrance pupil passes through shrink beam
Mirror (including organizing 5 after group 3 and beam-shrinked mirror before beam-shrinked mirror) imaging, its object distance is d1, image distance is d2。
Below with f1=20mm, f2=100mm, D3Exemplified by=1mm, the data of each parameter in figure are provided：
D1=2f1* tan (arcsin0.27)=11.216mm；
Take object distance d1(d during=10mm1Value is not fixed, and image distance d is only influenceed during change2),
D2=f2:f1=5.000mm；
F is compared by shrink beam2:f3=2f1* tan (arcsin0.27) draws f3=8.916mm；
D2 is calculated in two steps using Gauss formula：
Gauss formula：Wherein, f is lens object space focal length, and f' is lens image space focal length, and l is object distance, l'
For image distance.
The first step：The entrance pupil of collimating mirror 2 is calculated through organizing the positions of 3 imagings before beam-shrinked mirror.
The object distance of group 3 before known beam-shrinked mirror：L=-10mm；Object space focal length f=-100mm；Image space focal length f'=100mm, root
Can be in the hope of entrance pupil with respect to the image distance l'=-11.111mm that 3 are organized before beam-shrinked mirror according to Gauss formula；
Second step：" as " that 3 are organized according to transitive relation, before beam-shrinked mirror is " thing " of group 5 after beam-shrinked mirror.
The object distance of group 5 after known beam-shrinked mirror：L=(- 11.111)+(- 100)+(- 10)=- 121.111mm；
Object space focal length f=-8.916mm；Image space focal length f'=8.916mm
According to Gauss formula can in the hope of emergent pupil position d2=l'=9.624mm.
Claims (3)
1. the probe light homogenising system of any reflecting surface velocity interferometer, including optical fiber output laser；It is characterized in that：Also
Including collimation camera lens and beam-shrinked mirror；The collimation camera lens is arranged on the output light path of optical fiber output laser, and collimating mirror
The focal plane of head is located at the fiber end face of optical fiber output laser；The beam-shrinked mirror includes group and group after beam-shrinked mirror before beam-shrinked mirror；
Group is arranged on the output light path of collimation camera lens before beam-shrinked mirror；Group is arranged on the output light path organized before beam-shrinked mirror after beam-shrinked mirror,
And group and the focal plane organized after beam-shrinked mirror are overlapped before beam-shrinked mirror, constitute Kepler telescope structure；
The optical fiber core diameter D of the fiber end face0, collimation camera lens focal length f1, the focal length f that organizes before beam-shrinked mirror2With organize after beam-shrinked mirror
Focal length f3Meet following relation：
In formula, α is the outgoing half-angle of the fiber end face outgoing beam；f2>f1>5mm；
The exit pupil position of homogenising system is each on the virtual fiber end face after homogenizing, the fiber end face of optical fiber output laser
The collimated camera lens of light beam and beam-shrinked mirror of point outgoing are exported after uniformly deploying and be layering from the virtual fiber end face.
2. the probe light homogenising system of any reflecting surface velocity interferometer according to claim 1, it is characterised in that：Institute
State and organized before beam-shrinked mirror and filtering hole is provided with the intermediate image plane organized after beam-shrinked mirror.
3. the probe light homogenising system of any reflecting surface velocity interferometer according to claim 2, it is characterised in that：Institute
State and be provided with diaphragm on collimation camera lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621477558.XU CN206362931U (en) | 2016-12-30 | 2016-12-30 | The probe light homogenising system of any reflecting surface velocity interferometer |
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| CN201621477558.XU CN206362931U (en) | 2016-12-30 | 2016-12-30 | The probe light homogenising system of any reflecting surface velocity interferometer |
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