CN109283637A - One kind being used for the homogenized fiber coupled laser of interference pattern background - Google Patents
One kind being used for the homogenized fiber coupled laser of interference pattern background Download PDFInfo
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- CN109283637A CN109283637A CN201811346766.XA CN201811346766A CN109283637A CN 109283637 A CN109283637 A CN 109283637A CN 201811346766 A CN201811346766 A CN 201811346766A CN 109283637 A CN109283637 A CN 109283637A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4202—Packages, e.g. shape, construction, internal or external details for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention discloses one kind to be used for the homogenized fiber coupled laser of interference pattern background, including laser, collimator/coupler, connector, large-numerical aperture less fundamental mode optical fibre and end caps；Large-numerical aperture less fundamental mode optical fibre input terminal is connected by connector with coupler, and output end connects end caps；The light that laser exports is collimated and is coupled in large-numerical aperture less fundamental mode optical fibre, exported finally by end caps as light source, collimator/coupler by laser.The hot spot range that laser is exported by large-numerical aperture less fundamental mode optical fibre in the present invention is big, and large-numerical aperture less fundamental mode optical fibre exports both of which, is LP respectively01Mould and LP11Mould, both mode-coherents are superimposed so that single mode Gaussian beams are shaped as class flat top beam, and the light intensity contrast ratio for reaching interferometer system by the light beam that end caps export is small, to reach the homogenized effect of interference pattern background.
Description
Technical field
The invention belongs to field of lasers, and in particular to one kind is used for the homogenized fiber coupled laser of interference pattern background.
Background technique
Interference technique and interferometer occupy an important position always in optical measurement.Since laser the 1960s
Come out and digital image processing techniques development, make it is this with optical wavelength and its be subdivided into scale progress measurement have very
High measurement sensitivity and accuracy, also expands range ability, in many necks such as accurate measurement, Precision Machining and real-tune TT & C
Domain is widely applied.
Interferometry is a kind of based on light wave principle of stacking, and analysis handles bright dark variation, shape of stripes variation in interference field
Or the variation of its fringe number, therefrom obtain measured technology for information about.Interferometer is using the wavelength of light as measurement unit
A kind of high-precision, highly sensitive metrology and measurement method and instrument, it is widely used in optical measurement.Interference pattern is dry
The information that interferometer is exported, interference fringe are the tracks of optical path difference identical point in interference field, in optical measurement according to interference item
Situations such as shape of line, direction, density, color and move of stripe, so that it may measurement tested optical quantities related with optical path difference
(face shape, angular error, index of refraction homogeneity, prism are differed with the wave of lens etc.).
Laser, that is, stimulated radiation image intensifer, chief component have pumping source resonant cavity.The light that laser issues
Quality is pure, spectrum-stable, is widely used to the necks such as science and technology, military, business, medical treatment, industrial processes and information communication at present
Domain.In industrial processing field, laser can be used as high-intensity light source, for cutting, mark, welding, punching etc.；In army
Thing field, laser can be used for vehicle-mounted, Shipbased Laser Weapon, can also be used as the beacon light source of laser weapon；Furthermore laser
Device is also widely used in fields such as photoelectronic warfare, laser guidance and induced with laser nuclear fusions.
When using conventional commercial interferometer, due to the influence of system noise, it often will appear interference pattern background luminance point
The non-uniform problem of cloth, to limit the precision of interference detection.Standard sources of the laser as interferometer, have directionality,
The advantages that high brightness, high-energy and monochromaticjty, and there is very strong time and spatial coherence, therefore optics member in interference system
The defect (such as dust, recess, scar and bubble) on part surface can as light scatter center generate noise, influence interference pattern at
As effect.Conventional commercial interferometer generally use low-coherence light source perhaps white light as interferometer light source or imaging be
In system plus rotating ground glass is to reduce system noise, but effect is not apparent.
Summary of the invention
The purpose of the present invention is to provide one kind to be used for the homogenized fiber coupled laser of interference pattern background, solves use
When conventional commercial interferometer it is easy to appear the non-uniform problem of interference pattern background luminance, improve interference pattern at image quality
Amount.
The technical solution for realizing the aim of the invention is as follows: one kind being used for the homogenized optical fiber-coupled laser of interference pattern background
Device, including laser, collimator/coupler, connector, large-numerical aperture less fundamental mode optical fibre and end caps；Large-numerical aperture is few
Mode fiber input terminal is connected by connector with coupler, and output end connects end caps；Laser as light source, collimator/
The light that laser exports is collimated and is coupled in large-numerical aperture less fundamental mode optical fibre by coupler, is exported finally by end caps.
The large-numerical aperture less fundamental mode optical fibre is the optical fiber that numerical aperture is greater than 0.15.It is compared with single mode optical fiber, same
Sampling condition under using large-numerical aperture less fundamental mode optical fibre the more uniform hot spot of light distribution can be obtained.
The large-numerical aperture less fundamental mode optical fibre exports both of which, respectively LP01Mould and LP11Mould, both mode-coherents
So that single mode Gaussian beams are shaped as class flat top beam, the light beam for passing through end caps output reaches the light of interferometer system for superposition
Strong contrast is small, to reach the homogenized effect of interference pattern background.
The end caps are used to protect the output end of large-numerical aperture less fundamental mode optical fibre, prevent its physical damnification, optical fiber end
Cap output end face carries out plated film processing or oblique 8 ° of processing, inhibits the end face reflection of large-numerical aperture less fundamental mode optical fibre.
Compared with prior art, the present invention its remarkable advantage is:
(1) improve interference pattern image quality using fiber coupled laser, have no need to change interferometer internal structure.
(2) it is exported using large-numerical aperture less fundamental mode optical fibre, hence it is evident that improve interference pattern image quality, improve interferometer survey
Accuracy of measurement.
(3) applied widely, it can be applied to any kind of interferometer.
(4) device is simple, easy to carry, and cost is relatively low, suffers from actively to scientific experiment, engineering development and product manufacturing
Effect.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the embodiment of the present invention pilot system schematic diagram.
Fig. 3 is the mode output intensity figure of optical fiber in the embodiment of the present invention, wherein figure (a) is large-numerical aperture less fundamental mode optical fibre
Both of which output intensity distribution map, figure (b) are large-numerical aperture less fundamental mode optical fibre both of which output intensity stacking chart, are schemed (c)
For large-numerical aperture less fundamental mode optical fibre and single mode optical fiber output intensity comparison diagram.
Fig. 4 be fiber coupled laser of the present invention as interferometer light source when interference pattern.
Fig. 5 is the interference pattern under conventional dry interferometer light source.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
In conjunction with Fig. 1, one kind being used for the homogenized fiber coupled laser of interference pattern background, including laser 1, collimator/coupling
Clutch 2, connector 3, large-numerical aperture less fundamental mode optical fibre 4 and end caps 5；4 input terminal of large-numerical aperture less fundamental mode optical fibre passes through company
It connects device 3 to be connected with coupler 2, output end connects end caps 5；Laser 1 is used as light source, and collimator/coupler 2 is by laser
The light of 1 output collimates and is coupled in large-numerical aperture less fundamental mode optical fibre 4, exports finally by end caps 5.
The laser that laser 1 issues has good directionality, coherence and stable spectrum, can be approximated to be light
Source, as the good light source of interferometer.
Collimator/coupler 2 should can collimate the light of larger wave-length coverage, and focus offset very little, when change light source wave
When long, it is possible to reduce realign.
Collimator/coupler 2 should have high heat stability, less sluggish and higher coupling efficiency.Suitable for list
Mould, multimode and polarization maintaining optical fibre.
2 low-profile of collimator/coupler, it is highly stable and easy to use.
To keep the static of connector 3 and large-numerical aperture less fundamental mode optical fibre 4, collimation device/coupler 2 is needed to carry out X and Y
Linear alignment, pitching and the deflection angle in direction are aligned and the adjusting of Z axis, and reaching the collimation of laser 1 purpose, (adjustment method is being purchased
It buys and is described on the product description of collimator/coupler 2, this will not be repeated here).
Large-numerical aperture less fundamental mode optical fibre 4 should have lower insertion loss and higher return loss, and repeatability is high, warm
It is good to spend stability, and interfix performance is good, tensile property is strong, can be very good to connect with collimator/coupler 2.
Large-numerical aperture less fundamental mode optical fibre 4 is the optical fiber that numerical aperture is greater than 0.15.It compares with single mode optical fiber, is similarly adopting
The more uniform hot spot of light distribution can be obtained using large-numerical aperture less fundamental mode optical fibre 4 under the conditions of sample.The calculating of numerical aperture NA
Formula isWherein, n1For the fiber core refractive index of large-numerical aperture less fundamental mode optical fibre 4, n2Lack mould for large-numerical aperture
The cladding index of optical fiber 4.Numerical aperture characterizes the ability that fiber end face receives light, and numeric aperture values are bigger, and optical fiber receives
The ability of light is stronger.
End caps 5 are used to protect the output end of large-numerical aperture less fundamental mode optical fibre 4, prevent its physical damnification, end caps 5
Output end face carries out plated film processing or oblique 8 ° of processing, inhibits the end face reflection of large-numerical aperture less fundamental mode optical fibre 4.
Embodiment 1
Use fiber coupled laser as light source by taking the depth of parallelism of commercial fizeau interferometer measurement eyeglass as an example in conjunction with Fig. 2
It is compared with conventional light source, the imaging effect of interference pattern in the case of two kinds of observation.
One kind being used for the homogenized fiber coupled laser of interference pattern background, including laser 1 (He-Ne laser, operating wave
Long 633nm), (Soret is rich, model PAF2-A4A, focal length 4mm, clear aperature 1.8mm, anti-reflection film wavelength for collimator/coupler 2
Range 350-700nm), connector 3, large-numerical aperture less fundamental mode optical fibre 4 (Nufern, UHNA3,1.8/125, by wavelength 900 ±
50nm, fibre core numerical aperture 0.35) and end caps 5 (oblique 8 ° of grinder fine grinding).
Interferometer used in testing is commercial fizeau interferometer, including spectroscope 6, collimating mirror 7, standard mirror 8 and test
Mirror 9.The light beam that fiber coupled laser is launched by end caps 5 is after spectroscope 6, by collimating mirror 7 with directional light
Beam outgoing, is incident upon on standard mirror 8.A part of light is reflected from 8 upper surface of standard mirror, and another part light penetrates standard mirror 8
It is reflected after being mapped to 9 upper surface of test mirrors, this two parts reflection light enters observation system 10 after spectroscope reflects, and generates dry
Relate to striped 11.
Fiber coupled laser disclosed in this invention uses large-numerical aperture less fundamental mode optical fibre 4, and conventional commercial interferometer
Light source uses single mode optical fiber.
In conjunction with Fig. 3 (a), it is LP respectively that there are two types of modes to export for large-numerical aperture less fundamental mode optical fibre 4 used in the present invention01
Mould and LP11Mould；In conjunction with Fig. 3 (b), the superimposed light beam of both modes is approximately flat top beam, in conjunction with Fig. 3 (c), big numerical aperture
Diameter less fundamental mode optical fibre 4 and single mode optical fiber compare, and output intensity is more evenly distributed.Assuming that the diameter of collimating mirror 7 is D, single mode optical fiber
The contrast C of output beam arrival collimating mirror 71Are as follows:
Wherein, Imax1It is the light intensity maximum value that single mode optical fiber output beam reaches collimating mirror 7, Imin1It is single mode optical fiber output
The light intensity minimum value of light beam arrival collimating mirror 7.
The contrast C of 4 output beam of large-numerical aperture less fundamental mode optical fibre arrival collimating mirror 72Are as follows:
Wherein, Imax2It is the light intensity maximum value that 4 output beam of large-numerical aperture less fundamental mode optical fibre reaches collimating mirror 7, Imin2It is big
The light intensity minimum value of 4 output beam of numerical aperture less fundamental mode optical fibre arrival collimating mirror 7.
As can be seen that 4 output beam of large-numerical aperture less fundamental mode optical fibre reaches the contrast C of collimating mirror 7 from Fig. 3 (c)2It is bright
The aobvious contrast C that collimating mirror 7 is reached better than single mode optical fiber output beam1。
When light source of the fiber coupled laser disclosed in this invention as interferometer, interference fringe picture such as Fig. 4 institute is obtained
Show, due to having used large-numerical aperture less fundamental mode optical fibre 4, fiber coupled laser output beam reaches the light intensity comparison of collimating mirror 7
Spend C2It is obviously reduced, interference pattern illuminance distribution, image quality is excellent.
Conventional commercial interferometer light source uses single mode optical fiber, and numerical aperture is small, and the light beam launched is in apparent Gauss
Distribution reaches the light intensity contrast ratio C of collimating mirror 71It is larger, so that interference pattern brightness irregularities, as shown in Figure 5.
Paired observation Fig. 4 and Fig. 5, it can be found that light source of the fiber coupled laser disclosed in this invention as interferometer
When, interference pattern Luminance Distribution more evenly, can be obviously improved the imaging effect of interference pattern, have to the measurement accuracy for improving interferometer
It is significant.
Claims (6)
1. one kind be used for the homogenized fiber coupled laser of interference pattern background, it is characterised in that: including laser (1), collimator/
Coupler (2), connector (3), large-numerical aperture less fundamental mode optical fibre (4) and end caps (5)；Large-numerical aperture less fundamental mode optical fibre (4)
Input terminal is connected by connector (3) with collimator/coupler (2), and output end connects end caps (5)；Laser (1) conduct
The light that laser (1) exports is collimated and is coupled in large-numerical aperture less fundamental mode optical fibre (4) by light source, collimator/coupler (2),
It is exported finally by end caps (5).
2. being used for the homogenized fiber coupled laser of interference pattern background according to claim 1, it is characterised in that: the laser
Device (1) i.e. stimulated radiation image intensifer.
3. being used for the homogenized fiber coupled laser of interference pattern background according to claim 1, it is characterised in that: the collimation
Device/coupler (2) is suitable for single mode, multimode and polarization maintaining optical fibre.
4. being used for the homogenized fiber coupled laser of interference pattern background according to claim 1, it is characterised in that: the big number
Being worth aperture less fundamental mode optical fibre (4) is the optical fiber that numerical aperture is greater than 0.15.
5. according to claim 1 or 4 is described for the homogenized fiber coupled laser of interference pattern background, it is characterised in that: described
Large-numerical aperture less fundamental mode optical fibre (4) exports both of which, respectively LP01Mould and LP11Mould, both mode-coherents be superimposed so that
Single mode Gaussian beams are shaped as class flat top beam, and the light intensity pair of interferometer system is reached by the light beam that end caps (5) export
It is smaller than degree, to reach the homogenized effect of interference pattern background.
6. being used for the homogenized fiber coupled laser of interference pattern background according to claim 1, it is characterised in that: the optical fiber
End cap (5) is used to protect the output end of large-numerical aperture less fundamental mode optical fibre (4), and end caps (5) output end face carries out plated film processing
Or oblique 8 ° of processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811346766.XA CN109283637A (en) | 2018-11-13 | 2018-11-13 | One kind being used for the homogenized fiber coupled laser of interference pattern background |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811346766.XA CN109283637A (en) | 2018-11-13 | 2018-11-13 | One kind being used for the homogenized fiber coupled laser of interference pattern background |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366502A (en) * | 2020-11-06 | 2021-02-12 | 南京理工大学 | Single transverse mode linear polarization state large divergence angle laser light source for interferometry |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018820A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Flat-top optical fiber |
| CN103197382A (en) * | 2013-03-01 | 2013-07-10 | 南京理工大学 | Optical fiber derived type interferometer laser light source system |
| US20160202142A1 (en) * | 2015-01-08 | 2016-07-14 | Nec Laboratories America, Inc. | Distributed multi-channel coherent optical fiber sensing system |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN107978960A (en) * | 2017-12-15 | 2018-05-01 | 中国科学技术大学 | One kind is exempted to debug column vector optical fiber laser |
-
2018
- 2018-11-13 CN CN201811346766.XA patent/CN109283637A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018820A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Flat-top optical fiber |
| CN103197382A (en) * | 2013-03-01 | 2013-07-10 | 南京理工大学 | Optical fiber derived type interferometer laser light source system |
| US20160202142A1 (en) * | 2015-01-08 | 2016-07-14 | Nec Laboratories America, Inc. | Distributed multi-channel coherent optical fiber sensing system |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN107978960A (en) * | 2017-12-15 | 2018-05-01 | 中国科学技术大学 | One kind is exempted to debug column vector optical fiber laser |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366502A (en) * | 2020-11-06 | 2021-02-12 | 南京理工大学 | Single transverse mode linear polarization state large divergence angle laser light source for interferometry |
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