CN101639601A - Beam combining method - Google Patents
Beam combining method Download PDFInfo
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- CN101639601A CN101639601A CN200810117576A CN200810117576A CN101639601A CN 101639601 A CN101639601 A CN 101639601A CN 200810117576 A CN200810117576 A CN 200810117576A CN 200810117576 A CN200810117576 A CN 200810117576A CN 101639601 A CN101639601 A CN 101639601A
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- refractive index
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Abstract
The invention provides a beam combining method. A plurality of incident beams are coupled into a material of which refractive index is equal to zero, and are emergent from a planar emergent surface ofthe material of which refractive index is equal to zero. The beam combining method of the invention combines a plurality of paths of incident light into one beam in space by using the low-index material of which effective refractive index is equal to zero, and has the following advantages that: the power of the combined beam is the sum of power of the plurality of incident beams; the divergence angle of the divergence angle approaches to zero, and the quality of the beams is not limited by the incident light, which have great importance for the development of beam combining technology; and the combining method of the invention is suitable for the laser of various operating modes such as continuation, pulse and the like, and the common beams such as LED light; moreover, the combining method does not need to precisely regulate the light path, and has the advantages of simple structure, few used optical devices, low cost, wide application range, simple and convenient operation, high stability and the like.
Description
Technical field
The present invention relates to optical technical field, particularly a kind of with multiple laser or the synthetic a branch of method of ordinary beam of light.
Background technology
High power, high light beam quality laser have important use at aspects such as military affairs, industrial processes and science frontier researchs and are worth.In general, the separate unit laser instrument is along with the raising of output power, and its beam quality is non-linear decline, therefore adopts multiple laser to be synthesized a branch of, obtains high power simultaneously, high light beam quality laser is the important method that obtains high-power and high-lighting beam quality laser.
At present, proposed in the world many laser are carried out the synthetic approach of power, as direct synthetic technology, relevant synthetic technology, wavelength beams is synthetic, polarization is synthetic, the mechanical synthetic technology of pulse sequence etc.In these traditional synthetic technologys, the synthetic laser beam quality all is subjected to the restriction of sub-laser beam quality.Simultaneously, direct synthetic technology, the N platform is synthetic, and power can improve about N doubly, but beam quality directly worsens more than about N times; Relevant synthetic technology will realize that relevant the synthesizing of multiple laser exported high brightness laser, and its a plurality of laser beam must satisfy frequency, phase place, polarization unanimity, technical scheme complexity, poor stability; The synthetic separate unit laser instrument that needs to adopt different wave length of wavelength beams, narrow application range; The sub-number of lasers that polarization synthesizes is limited; Pulse sequence machinery synthetic technology because the shake of the catoptron of mechanical hook-up will directly cause the laser beam drift, thereby degenerates synthetic laser beam quality, therefore requires mechanical stability high, closes the bundle back and shakes big.
In a word, present existing laser synthetic technology has synthetic beam quality acceptor laser beam quality restriction, shortcomings such as complex structure and poor stability.
Summary of the invention
Therefore, task of the present invention provides a kind of synthetic beam quality and is not subjected to the quality limitations of light beam to be synthesized, beam combining method simple in structure.
Beam combining method of the present invention is coupled into many incident beams in the null material of refractive index, and by the plane exit facet outgoing of the null material of described refractive index.
In the said method, described refractive index null material preferred negative refraction materials or photonic crystal.
In the said method, described coupling process is directly coupling, optical fiber coupling or adopts the optical element coupling.
In the said method, light source can also be arranged on the null material internal of described refractive index.
Further, the preferred laser diode of described light source, light emitting diode and light-emitting diode chip for backlight unit.
Beam combining method of the present invention uses the null low-index material of effective refractive index that the multichannel incident light is synthetic a branch of in the space, has following advantage:
1. the power of synthetic light beam be the multi beam incident optical power and;
2. the angle of divergence of synthetic light beam levels off to zero, and beam quality is not subjected to the restriction of incident light, and this will be significant to the development of light beam synthetic technology;
3. the laser of various drive manners such as synthetic method of the present invention is applicable to continuously, pulse, also be applicable to ordinary beam of light such as LED light, need not the minute adjustment light path simultaneously, and it is simple in structure, the optical device that uses is few, has with low cost, applied widely, easy and simple to handle and stable advantages of higher.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 is the directed radiation mechanism figure of the null material of refractive index;
Fig. 2 adopts material with negative refractive index, according to the synthetic method index path of direct coupling system;
Fig. 3 adopts material with negative refractive index, according to the synthetic method index path of imbedding manifold type;
Fig. 4 adopts photon crystal material, according to the synthetic method index path of optical fiber manifold type;
Fig. 5 adopts material with negative refractive index, according to the synthetic method index path of side coupling scheme;
Fig. 6 adopts material with negative refractive index, according to the synthetic method index path of side coupling scheme.
Embodiment
Light beam closes the related material of bundle and mainly comprises two kinds of photonic crystal and negative indexes among the present invention, wherein, photonic crystal claims that also photonic bandgap material is the dielectric structure that a kind of refractive index changes in space periodicity, and its period of change and light wavelength are the same order of magnitude.The most essential cyclical variation that is characterised in that photonic crystal medium refractive index of photonic crystal, and produce photon band system thus, the photonic crystal negative refraction is based on the Bragg diffraction effect, relevant photonic crystal can be referring to people's such as Dmitry N. related article (Self-guiding in two-dimensional photonic crystals, 19May 2003/Vol.11, No.10/OPTICS EXPRESS 1203).
And material with negative refractive index is a kind of new material that grew up in recent years, it is according to the surface plasma body technique, utilize regular tinsel material array design to be made, this is that a kind of conductivity and magnetic permeability all are negative or null material, and its refractive index can customize as required, about the design and the making of this low-index material can be with reference to people's such as Smith the article of delivering (Composite medium with simultaneously negative permeability andpermittivity, Phys.Rev.Lett., 2000,84 (18): 4184-4187.).
Certainly, material with negative refractive index can only have conductivity or only have magnetic permeability to equal zero, and can realize that equally refractive index equals zero, and this all knows those skilled in the art.
Fig. 1 has provided the ultimate principle of refraction materials of the present invention, it will be understood by those in the art that in certain wavelength coverage, when the refractive index n of material 1
EffLevel off to zero the time, as shown in Figure 1, according to refraction law n
EffSin Θ
i=n
0Sin Θ
0, wherein, Θ
iBe incident angle, Θ
0Be the refraction angle, because n
EffTherefore no matter equal 0, the incident angle Θ of incident light 2
iHow, refraction angle Θ
0All be tending towards 0, promptly on exit facet, light beam all will be along the normal direction outgoing, therefore, as N bar (N 〉=1) light beam with different incidence angles Θ
iWhen inciding in the null material of this refractive index, along the normal direction outgoing of exit facet,, just can realize the equidirectional outgoing of emergent light, reach the synthetic purpose of light beam as long as exit facet is made into the plane with all.And regardless of each incident beam quality, the radiation directivity of the light beam after synthesizing all can obtain very big degree and improve, thereby makes synthetic beam quality no longer be subjected to the restriction of incident beam quality, finally obtains the synthetic laser output of high-power and high-lighting beam quality.
This beam combining method, needn't consider the conditions such as phase place, polarization between the incident beam, be applicable to continuously, various forms of laser, LED light etc. such as pulse, and need not the minute adjustment light path, simple in structure, usable range is extensive, and is easy and simple to handle, stability is high.
Fig. 2-Fig. 6 has provided the synthetic specific embodiment of several light beams, wherein,
Among Fig. 2 three are directly coupled in the null material with negative refractive index 204 of refractive index by different directions with 203 laser that send with frequency laser 201,202, and by the exit facet 205 parallel outgoing of the plane of described material with negative refractive index 204, realize the synthetic output of light beam, the power of output beam is three beams incident laser power sum, and beam quality is constant.Material with negative refractive index in the present embodiment and the disclosed low-index material structures of people identical (" conductivity and magnetic permeability are the complex media of negative simultaneously " such as Smith, Composite medium with simultaneously negativepermeability and permittivity, Phys.Rev.Lett., 2000,84 (18): 4184-4187.)
Among Fig. 3, three light-emitting diode chip for backlight unit 301,302 and 303 are imbedded the null material with negative refractive index of refractive index 304 inside, though the light beam that light source sends is towards all directions, but through after the refraction of exit facet 305, all along the normal direction outgoing of plane exit facet 305, thereby realize closing bundle, obtain high-quality synthetic light beam.
It will be appreciated by those skilled in the art that present embodiment also can use LASER Light Source, as laser diode etc., perhaps common light source as light emitting diode or other light sources etc., substitutes light-emitting diode chip for backlight unit.
Among Fig. 4, the laser of laser instrument 401,402 and 403 outputs is coupled in the null photon crystal material 404 of refractive index through optical fiber 406,407 and 408 respectively, wherein, the output terminal 409,410 and 411 of optical fiber is directly imbedded photon crystal material inside, can realize the coupling of light beam equally.
Among Fig. 5, two laser instruments 501,502 light beams that send are entered from the coupling of surface, the null material with negative refractive index of refractive index 504 left and right sides respectively, through synthetic light beam respectively perpendicular to the upper surface 505 and lower surface 506 outgoing of material with negative refractive index, because the upper surface 505 and the lower surface 506 of material with negative refractive index 504 all are the planes, so by the light beam of upper surface 505 output all along same direction outgoing, bundle is closed in realization, in like manner the lower surface 506 for plane also is like this, because so two bundle laser symmetry vertical incidence are upper and lower surface 505,506 outgoing beam intensity is basic identical.
Fig. 6 compares Fig. 5 doubles except the number of light emitting diode, and other are identical with Fig. 5, thereby can obtain the bigger synthetic light beam of intensity.
Those skilled in the art tell about according to top Fig. 5 and Fig. 6's, be to be understood that, adopt the method for side coupling, the multi beam incident light can be synthesized two bundle or the synthetic light of multi beam more, also a branch of or a few bundle incident light can be divided into multi beam, key is to control the quantity of incident and exit plane, and by area ratio and incident direction of light between the control exit plane, can also adjust the relative intensity of respectively restrainting outgoing beam to a certain extent, just repeat no more at this.
Certainly, it will be appreciated by those skilled in the art that because material with negative refractive index only has the null effect of refractive index to the light of wavelength in the certain limit, so should select suitable material with negative refractive index and incident light to be complementary in the practical application.
It should be noted that embodiment in above each accompanying drawing at last only in order to beam combining method of the present invention to be described, but unrestricted.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. a beam combining method is coupled into many incident beams in the null material of refractive index, and by the plane exit facet outgoing of the null material of described refractive index.
2. method according to claim 1 is characterized in that, the null material of described refractive index is material with negative refractive index or photonic crystal.
3. method according to claim 1 is characterized in that, described coupling process is directly coupling, optical fiber coupling or adopts the optical element coupling.
4. method according to claim 1 is characterized in that, light source is arranged on the null material internal of described refractive index.
5. method according to claim 4 is characterized in that, described light source is laser diode, light emitting diode, light-emitting diode chip for backlight unit.
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| CN200810117576A CN101639601A (en) | 2008-08-01 | 2008-08-01 | Beam combining method |
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| CN200810117576A CN101639601A (en) | 2008-08-01 | 2008-08-01 | Beam combining method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713555A (en) * | 2019-03-14 | 2019-05-03 | 中国科学院理化技术研究所 | A kind of amplification laser Incoherent beam combining device of aperture lath altogether |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713555A (en) * | 2019-03-14 | 2019-05-03 | 中国科学院理化技术研究所 | A kind of amplification laser Incoherent beam combining device of aperture lath altogether |
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Application publication date: 20100203 |