CN106168711B - A kind of axicon lens ring type laser irradiating device - Google Patents
A kind of axicon lens ring type laser irradiating device Download PDFInfo
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- CN106168711B CN106168711B CN201610679453.0A CN201610679453A CN106168711B CN 106168711 B CN106168711 B CN 106168711B CN 201610679453 A CN201610679453 A CN 201610679453A CN 106168711 B CN106168711 B CN 106168711B
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- axicon lens
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- convex axicon
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
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- Optics & Photonics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The present invention provides a kind of axicon lens ring type laser irradiating device, it includes coaxial the first plano-convex axicon lens and the second plano-convex axicon lens being placed in parallel, the first plano-convex axicon lens is identical with the refractive index of the second plano-convex axicon lens, the conical surface of the first plano-convex axicon lens is identical with the conical surface direction of the second plano-convex axicon lens, the base angle of the first plano-convex axicon lens is less than the base angle of the second plano-convex axicon lens, and the base angle of the first plano-convex axicon lens and the second plano-convex axicon lens is respectively less than 5 °.Compared with the prior art, the beneficial effects of the present invention are: a kind of axicon lens ring type laser irradiating device provided by the invention, which solves, to be needed to avoid the irradiation non-uniformity due to caused by resetting by moving into repeatedly, removing the drawbacks of axicon lens is to realize 0 offset in the prior art.
Description
Technical field
The present invention relates to substance internal component detecting devices fields, and in particular to a kind of axicon lens ring type laser irradiation dress
It sets.
Background technique
Spatial offset Raman spectroscopy (SORS) is a kind of novel spectral measurement methods occurred in recent years, is drawn with tradition
Graceful spectral technique is compared, and the focus of collecting lens and the focus of incident laser spatially have a spacing in spectral collection system
From offset.Due to (diffusely scattering media) on laser light incident to sample, the laser intensity of sample interior can be with incident depth
Increase and exponential decay, generated a part scattering light will reach sample Deep ingredient, and sample is returned again to after Multiple Scattering
Product surface.Therefore, it on sample surfaces, position that scattering light returns and is produced at exciting light incidence point different degrees of inclined
It moves.If be collected at certain deviation post to scattering light, it can be obtained and carry measured matter component inside structural information
Raman light.In SORS technology, Raman signal excitation-collection structure particularity makes it have and inhibits surface layer composition to draw well
Graceful and fluorescence spectrum ability especially suitable for the extraction to sub-layer ingredient Raman spectrum under non-transparent material, and then realizes object
Quick, the Nondestructive Identification of matter composition.Powder, colloid, condensate and drug detection, cultural heritage identification, disease are had been used at present
In the research and application of diagnosis, contraband safety check etc., application prospect is extremely wide.
In practical application, SORS technology critical issue to be solved be improve detectivity, i.e., increase investigation depth and
The signal-to-noise ratio of measuring signal is improved, and used laser irradiation mode determines that it is applied to laser power on sample to be tested
Size, and then the intensity and its signal-to-noise ratio for influencing the depth of interaction of laser and sample, inspiring Raman signal.The U.S.
M.V.Schulmerich uses axicon lens and the box-like irradiation structure of lens group, overcomes the point that SORS technical research initial stage uses
Formula irradiates the drawback of laser energy deficiency in structure, enhances the laser power being applied on sample to be tested, makes the drawing being collected into
Graceful signal enhancing；The irradiation structure in Britain's rutherford's A Pu Islington laboratory is more simplified, and optical element is only a piece of cone
Lens.It is continuously adjustable since 0 that said two devices realize offset on two-dimensional space, but there are still certain deficiencies: non-zero sky
Between offset change by movement of the axicon lens on optical path direction come when realizing, and being measured to the spectrum of 0 offset,
Optical element need to be removed from optical path.It is movable into and out repeatedly in this way, easily causes the difference of translation stage resetting, increase
The unstability of system.
In view of the above drawbacks, creator of the present invention obtains the present invention by prolonged research and practice finally.
Summary of the invention
To solve above-mentioned technological deficiency, the technical solution adopted by the present invention is, provides a kind of axicon lens ring type laser spoke
According to device, when it is applied to spatial offset Raman spectrum measurement system, do not need by axicon lens remove optical path in can be real
The spectral measurement of existing 0 offset.
A kind of axicon lens ring type laser irradiating device is provided, when laser beam irradiates on it, annular can be generated
Radiation source comprising coaxial the first plano-convex axicon lens and the second plano-convex axicon lens being placed in parallel, the first plano-convex cone are saturating
Mirror is identical with the refractive index of the second plano-convex axicon lens, and the conical surface of the first plano-convex axicon lens and second plano-convex cone are saturating
The conical surface direction of mirror is identical, and the base angle of the first plano-convex axicon lens is less than the base angle of the second plano-convex axicon lens, and described the
The base angle of one plano-convex axicon lens and the second plano-convex axicon lens is respectively less than 5 °.
Preferably, when the distance between the first plano-convex axicon lens and the second plano-convex axicon lens are d1When, it is described
Distance d of the 0 offset exposure spots of the generation of axicon lens ring type laser irradiating device apart from the second plano-convex axicon lens2Meet
Formula:
Wherein, n is the refractive index of the first plano-convex axicon lens and the second plano-convex axicon lens, θ1For the bottom of the first plano-convex axicon lens
Angle, θ2For the base angle of the second plano-convex axicon lens, r0For the laser beam radius after expanding, b is the bottom of the second plano-convex axicon lens
Width, a are the radius of the second plano-convex axicon lens, 0 ° of < θ1< θ25 ° of <.
Preferably, working as the distance between the first plano-convex axicon lens and the second plano-convex axicon lens d1When immobilizing, change
Become 0 offset exposure spots and the second plano-convex axicon lens distance d2, the annular radiation source of consecutive variations, the annular can be obtained
The internal diameter r of radiation source2Meet formula:
r2=(d2-d)·cot(n-1)(θ2-θ1)
Wherein, d is annular the distance between radiation source and the second plano-convex axicon lens.
The beneficial effects of the present invention are a kind of axicon lens ring type laser irradiations provided by the invention compared with the prior art
Device, which solves, to be needed in the prior art by moving into repeatedly, remove the drawbacks of axicon lens is to realize 0 offset, avoid due to
Irradiation non-uniformity caused by resetting.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical solution in various embodiments of the present invention
The attached drawing used is briefly described.
Fig. 1 is a kind of structural schematic diagram of axicon lens ring type laser irradiating device provided by the invention；
Fig. 2 is that the laser beam after expanding is radiated at the light path principle after the axicon lens ring type laser irradiating device
Figure；
Fig. 3 is a kind of schematic diagram of spatial offset Raman spectroscopic detection system.
Specific embodiment
Below in conjunction with attached drawing, the forgoing and additional technical features and advantages are described in more detail.
As shown in FIG. 1, FIG. 1 is a kind of structural schematic diagrams of axicon lens ring type laser irradiating device provided by the invention, should
Axicon lens ring type laser irradiating device includes: coaxial the first plano-convex axicon lens 1 and the second plano-convex axicon lens 2 being placed in parallel, should
First plano-convex axicon lens 1 is identical with the refractive index of the second plano-convex axicon lens 2, the conical surface and the second plano-convex of the first plano-convex axicon lens 1
The conical surface direction of axicon lens 2 is identical, base angle of the base angle less than the second plano-convex axicon lens 2 of the first plano-convex axicon lens 1, the first plano-convex
The base angle of axicon lens 1 and the second plano-convex axicon lens 2 is respectively less than 5 °.When the laser after expanding is along above-mentioned two plano-convex axicon lens
Optical axis direction be incident on the plane of the first plano-convex axicon lens 1 after, which can produce
Raw annular radiation source.
When the distance between the first plano-convex axicon lens 1 and the second plano-convex axicon lens 2 are d1When, which swashs
The distance d for 0 offset exposure spots the second plano-convex of distance axicon lens 2 that light-irradiating device generates2Meet formula (1):
Wherein, n is the refractive index of the first plano-convex axicon lens 1 and the second plano-convex axicon lens 2, θ1For the first plano-convex axicon lens 1
Base angle, θ2For the base angle of the second plano-convex axicon lens 2, r0For the laser beam radius after expanding, b is that the second plano-convex cone is saturating
The bottom width of mirror 2, a are the radius of the second plano-convex axicon lens 2,0 ° of < θ1< θ25 ° of <.
As the distance between the first plano-convex axicon lens 1 and the second plano-convex axicon lens 2 d1When immobilizing, change 0 offset
Exposure spots and 2 distance d of the second plano-convex axicon lens2, the annular radiation source of consecutive variations can be obtained, the annular radiation source
Internal diameter r2Meet formula (2):
r2=(d2-d)·cot(n-1)(θ2-θ1) (2)
Wherein, d is annular the distance between radiation source and the second plano-convex axicon lens 2.
The process for how obtaining above-mentioned formula is described below, as shown in Fig. 2, being radiated at for the laser beam after expanding
Light path principle figure after the axicon lens ring type laser irradiating device,
If the incidence angle that light beam is incident on the first plano-convex axicon lens 1 is α, incident ray and refracted light angle are β, refraction
Angle is γ, can be obtained by the law of refraction:
α=θ1, γ=alpha+beta (3)
Nsin α=1sin γ=1sin (alpha+beta) (4)
Due to the base angle θ of the first plano-convex axicon lens 11Less than 5 °, (4) formula can be of equal value are as follows:
N α=alpha+beta (5)
That is: β=(n-1) α=(n-1) θ1 (6)
Intersection point spacing in optical axis OO ' is gone up from AB=d in the vertex and light beam that the first plano-convex axicon lens 1 is enabled in Fig. 20, two cones are thoroughly
Distance AQ=d between mirror1, the internal radius that light beam is formed on the second plano-convex axicon lens 2 is r1, it is available:
r1=(d1-d0) tan β=(d1-d0) tan [(n-1) α]=d1·tan[(n-1)θ1]-r0 (8)
If the incidence angle of unirefringence is β, refraction angle β in the second plano-convex axicon lens 21, the incidence angle of birefringence is
β2, refraction angle γ2, it can be obtained by the law of refraction:
1sin β=nsin β1 (9)
n·sinβ2=1sin γ2 (10)
Due to the base angle θ of the second plano-convex axicon lens 22Less than 5 °, formula (9) and (10) can be of equal value respectively are as follows:
β=n β1, n β2=γ2 (11)
From geometrical relationship: β1+β2=θ2 (12)
It is available by formula (11) and (12):
γ2=n β2=n (θ2-β1)=n θ2-β (13)
Work as γ2=θ2When, refracted light is parallel with optical axis, meets at this time:
γ2=n θ2- β=θ2 (14)
It follows that β=(n-1) θ2 (15)
That is: θ2=α=θ1 (16)
Thus, when two axicon lens base angles meet 0 ° of < θ1< θ2When the relationship that 5 ° of <, emergent ray can intersect at optical axis
On a bit, can be realized at this point 0 offset irradiation.
If vertex is D, radius a, bottom width b in the second plano-convex axicon lens 2, outgoing beam and optical axes crosspoint are E, with the
Two plano-convex axicon lens, 2 front surface intersection point is F, crosses F to optical axis and is vertical line GF, γ3For the angle of GF and EF, DE=d is enabled2, by geometry
Relationship can obtain:
GF=r1+CF·sinβ1 (18)
GD=GFtan θ2 (19)
d2=DE=GE-GD=GF (tan γ3-tanθ2) (20)
The normal and 2 front surface of the second plano-convex axicon lens for extending incident ray meet at M, from the geometric relations:
CM=b+atan θ2-r1·tanθ2 (21)
It arranges available:
By γ2=n θ2- β,β=(n-1) θ1, β=n β1It substitutes into:
It, can abbreviation by small angle approximation are as follows:
The internal diameter r of annular radiation source2The distance between second plano-convex axicon lens 2 d meets:
r2=(d2-d)·cotγ3=(d2-d)·cot(n-1)(θ2-θ1)
As shown in figure 3, being a kind of schematic diagram of spatial offset Raman spectroscopic detection system, the detection system is mainly for danger
Dangerous product especially liquid explosive measures, such as TNT explosive acid sodium, ammonium chloride, black powder, dimethylbenzene, hydrogen peroxide and
The prohibited items generally containing groups such as nitro, amino, phenyl ring such as alcohol are detected.The detection device includes: laser
101, expand device 102, axicon lens ring type laser irradiating device 103, signal collection device 104, band pass filter means 105, poly-
Coke installation 106, spectrometer 107, computer 108 and one-dimensional movement platform 1010.Axicon lens ring type laser irradiating device 103 wraps
It includes: coaxial the first plano-convex axicon lens and the second plano-convex axicon lens being placed in parallel.The first plano-convex axicon lens and the second plano-convex cone
The refractive index of lens is identical, and the conical surface direction of the conical surface of the first plano-convex axicon lens and the second plano-convex axicon lens is identical, the first plano-convex
Less than the base angle of the second plano-convex axicon lens, the base angle of the first plano-convex axicon lens and the second plano-convex axicon lens is small at the base angle of axicon lens
In 5 °.
The laser that laser 101 issues injects expand device 102, is formed and is swashed after expand device 102 carries out beam-expanding collimation
Light light beam, laser beam are incident on the plane of the first plano-convex axicon lens along the optical axis direction of two plano-convex axicon lens, by cone
Form annular radiation source after lens ring type laser irradiating device 103, by the annular radiation source directive sample cell 109 to
Sample changes the distance between axicon lens ring type laser irradiating device 103 and sample to be tested by one-dimensional movement platform 1010,
Realize that the continuous variable of annular radiation source internal diameter is adjusted.Through signal collection device 104 at the center of annular radiation source
The collection for carrying out signal light passes through focusing after eliminating all kinds of spurious signals other than signal light using band pass filter means 105
Device 106 focuses on the probe of spectrometer 107, carries out spectrum analysis by computer.When annular radiation source internal diameter changes
When, the relative distance between excitation point and bleeding point changes, that is, realizes the detection of spatial offset Raman spectrum.
The axicon lens ring type laser irradiating device of the application and spatial offset Raman spectroscopic detection system with the device,
It solves and needs to avoid by moving into repeatedly, removing the drawbacks of axicon lens is to realize 0 offset due to repeating in the prior art
Irradiation non-uniformity caused by positioning.Only by the translation in one-dimensional square, it is continuous since 0 that spatial offset can be realized
It is adjustable, the complexity of irradiation devices is not only reduced, while improving its stability, economically feasible.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative for the purpose of the present invention, and not restrictive
's.Those skilled in the art understand that in the spirit and scope defined by the claims in the present invention many changes can be carried out to it,
It modifies or even equivalent, but falls in protection scope of the present invention.
Claims (3)
1. a kind of axicon lens ring type laser irradiating device can generate annular exposure light when laser beam irradiates on it
Source, which is characterized in that it includes coaxial the first plano-convex axicon lens and the second plano-convex axicon lens being placed in parallel, first plano-convex
Axicon lens is identical with the refractive index of the second plano-convex axicon lens, the conical surface of the first plano-convex axicon lens and second plano-convex
The conical surface direction of axicon lens is identical, and the base angle of the first plano-convex axicon lens is less than the base angle of the second plano-convex axicon lens, institute
The base angle for stating the first plano-convex axicon lens and the second plano-convex axicon lens is respectively less than 5 °；
The axicon lens ring type laser irradiating device is connect with one-dimensional movement platform, and the axicon lens ring type laser irradiating device is logical
It crosses the one-dimensional movement platform and changes the distance between the axicon lens ring type laser irradiating device and sample to be tested.
2. a kind of axicon lens ring type laser irradiating device according to claim 1, which is characterized in that when first plano-convex
The distance between axicon lens and the second plano-convex axicon lens are d1When, the generation of the axicon lens ring type laser irradiating device
Distance d of the 0 offset exposure spots apart from the second plano-convex axicon lens2Meet formula:
Wherein, n is the refractive index of the first plano-convex axicon lens and the second plano-convex axicon lens, θ1For the base angle of the first plano-convex axicon lens, θ2
For the base angle of the second plano-convex axicon lens, r0For the laser beam radius after expanding, b is the bottom width of the second plano-convex axicon lens, a
For the radius of the second plano-convex axicon lens, 0 ° of < θ1< θ25 ° of <.
3. a kind of axicon lens ring type laser irradiating device according to claim 2, which is characterized in that when first plano-convex
The distance between axicon lens and the second plano-convex axicon lens d1When immobilizing, changes 0 offset exposure spots and the second plano-convex cone is saturating
The distance d of mirror2, the annular radiation source of consecutive variations, the internal diameter r of the annular radiation source can be obtained2Meet formula:
r2=(d2-d)·cot(n-1)(θ2-θ1)
Wherein, d is annular the distance between radiation source and the second plano-convex axicon lens.
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| CN110687097B (en) * | 2019-10-25 | 2022-11-18 | 北京华泰诺安探测技术有限公司 | Raman spectrum system with tunable excitation light frequency and detection method thereof |
| CN114217447B (en) * | 2021-11-22 | 2023-07-07 | 中国工程物理研究院应用电子学研究所 | Laser beam shaping and converting device |
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| CN101320216B (en) * | 2008-06-18 | 2010-06-09 | 上海微电子装备有限公司 | Reshaping structure of micro-photoetching illumination iris |
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