CN204360027U - A kind of wideband angular selects optical filter - Google Patents
A kind of wideband angular selects optical filter Download PDFInfo
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- CN204360027U CN204360027U CN201520018178.9U CN201520018178U CN204360027U CN 204360027 U CN204360027 U CN 204360027U CN 201520018178 U CN201520018178 U CN 201520018178U CN 204360027 U CN204360027 U CN 204360027U
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Abstract
The utility model discloses a kind of wideband angular and select optical filter.Along the direction of propagation of the broadband light of parallel incidence, broadband light first incides front end binary phase diffraction grating, after time light splitting of asymmetrical diffraction level, enter in the Volume Bragg grating of respective stages time distribution respectively, rear end binary phase diffraction grating is incided after carrying out corresponding angle Selection by Volume Bragg grating again, will through the parallel output of filtered broadband light; The diffraction lighting level Ci Cong center of binary phase diffraction grating increases successively to two side positions, and Volume Bragg grating is placed from center to both sides from low to high successively by its screen periods, and is symmetric with binary phase diffraction grating central axis.Binary phase diffraction grating and Volume Bragg grating combine and prepare space optics wave filter by the utility model employing, achieve the effect of broadband light input filter, have the advantages that structure is simple, filtering consistance is good.
Description
Technical field
The utility model relates to a kind of raster pattern wideband angular and selects optics filtering device, belongs to laser optical system device arts.
Background technology
In optical delivery, optical filter is used for selecting required wavelength from numerous wavelength, stops the light wave except this wavelength, is widely used in all kinds of optical system.As very sensitive to the interference of various spaces in Laser Transmission, various interference enters the spatially uniform that diffraction that optical element causes can reduce laser, thus the load capacity of Optical Maser System is declined.In imaging optical system, adopt space optics filtering process multi-color signal, can the quality of image be improved, remove high frequency noise and interference and strengthen image edge.
Traditional " 4f " space optics filtering system regulates support composition primarily of metal pin hole, convex lens and multidimensional.Light beam passes through pin hole after focusing on, the Fourier transform of lens is utilized to be used for separating spatial frequency composition different in laser, the angle of divergence that spatial frequency is high is large, medium-high frequency noise in light path because of depart from light normal incidence direction and not by pin hole, reach filter effect, aperture of lens determines spot size, and metal needle bore dia controls filter strength, realizes low-pass spatial filter action.Puncture because " 4f " system needs vacuum chamber to eliminate focusing and need large space or non-spherical lens to eliminate spherical aberration, therefore causing whole wave filter bulky; The aperture of wave filter is too little easily causes plasma Pinhole closure, and therefore very difficult to the filtering of medium-high frequency, filtering performance is poor; Wave filter primary optics is lens, for narrow-band impulse, the chromatic effects of lens element is also not obvious, then can not ignore wideband pulse, for free space linear transfer, the impact of 10nm magnitude bandwidth is limited, but the aberration of the elements such as lens is comparatively large, must think better of when system.
Before the utility model is made, what utilize volume holographic grating to carry out laser spatial filtering is reported in nineteen ninety-five the earliest, J. the people such as E. Ludman makes the holographic filter of carrying of mm of thickness, angle Selection reaches 1.0mrad, there is good spatial filtering effect (J. E. Ludman, J. Riccobono, N. Reinhand, et al., Nonspatial filter for laser beams, 1995,8-th Laser Optics Conference, June 27 – July 1, St. Petersburg, Russia.).Utilize volume holographic device to carry out spatial filtering, light beam does not need focusing, beam collimation is good, structure is simple and cost is low, and can realize two-dimensional space filtering with two block holographic filters superpositions.But for holographic media material mainly pore glass photochromics or the photopolymer photosensitive material etc. of filter element, poor stability, filtering homogeneity are undesirable, and material thermal resistance is bad, high power laser light can not be born and irradiate.
Utilize Volume Bragg grating to make narrow band filter to have been reported, publication number is the Chinese invention patent " narrow-band optical filter " of CN 101614879, relate to a kind of narrow-band optical filter, be made up of one piece of transmission-type Volume Bragg grating and a blocks of reflecting Volume Bragg grating; Publication number is the Chinese invention patent " high-power laser diffraction type spatial filter " of CN1 01738739A, relates to a kind of high power diffraction type spatial filter, have employed separate type Volume Bragg grating or biplate integrated form optical grating construction.
In prior art, document " transmission-type volume phase grating is to the low pass spatial filtering of continuous laser beam " (Zheng Guangwei, what flame indigo plant waits people, " Acta Optica ", the 4th phase in 2009); " transmission-type body grating is to the research of Ultrashort Pulsed Gaussian Beams diffraction characteristic " (Zheng Guangwei, Liu Li etc., " Acta Optica ", the 1st phase in 2009); " preparation for the Volume Bragg grating of implementation space filtering " (Zheng Haobin, what flame indigo plant waits people, " photoelectric project ", 1st phase in 2009) report Volume Bragg grating and realize laser beam two-dimensional space low-pass filtering to the diffraction characteristic of laser with holography method recording body Bragg grating in photopolymer, described wave filter configuration meets the demand of narrow-band filtering, does not support that broad band laser exports.
Summary of the invention
The purpose of this utility model is, for the deficiency that Reflection Optical Thin Film filtering prior art exists, there is provided a kind of and there is the high feature of large optical bandwidth, the carrying of high laser power and filtered energy efficiency, and Wideband angle selecting optical filter system simple for production and preparation method thereof.
For achieving the above object, the technical scheme that the utility model adopts is: a kind of wideband angular selects optical filter, and its filtering system comprises binary phase diffraction grating and the Volume Bragg grating of time distribution of asymmetrical diffraction level; Its structure is: along the direction of propagation of the broadband light of parallel incidence, broadband light first incides front end binary phase diffraction grating, after time light splitting of asymmetrical diffraction level, enter in the Volume Bragg grating of respective stages time distribution respectively, rear end binary phase diffraction grating is incided after carrying out corresponding angle Selection by Volume Bragg grating again, will through the parallel output of filtered broadband light; The structure of described front-end and back-end binary phase diffraction grating is consistent, and the shape of its grating is rectangle grizzly bar, and grating diffration lighting level Ci Cong center increases successively to two side positions; Described Volume Bragg grating is placed from center to both sides from low to high successively by its screen periods, and Volume Bragg grating and binary phase diffraction grating central axis are symmetric.
The screen periods of described front-end and back-end binary phase diffraction grating is tens nanometers ~ several microns, and dutycycle is 0.1 ~ 0.9, and grating thickness is tens nanometers ~ several microns.The screen periods of described Volume Bragg grating is tens nanometers ~ several microns, and dutycycle is 1:1, and grating thickness is 1 millimeter ~ several millimeters.The number of described Volume Bragg grating is secondary corresponding with the non-zero order of diffraction of the binary phase diffraction grating time number order of diffraction.
In technical solutions of the utility model, binary raster is a kind of dispersion element, in very wide spectral range, there is very high dispersion resolution characteristic, and the symmetrical multiorder diffractive ability of binary raster, different spectral components always have the diffraction light of correspondence direction, and angle of diffraction corresponds to wavelength value, improves diffraction efficiency and capacity usage ratio greatly.Body grating selects to meet the incident light of Bragg condition, suppresses parasitic light, only under fixed wave length condition or narrow band light useful, there is good angle selective properties.Therefore, under binary raster and body grating Satisfying Matching Conditions, broadband light spatial filtering is realized.In the utility model, the shape of binary raster is rectangle, and material is SiO
2, MgF
2, one in the transparent optical medium material such as ZnS, ZnO.
Existing technical scheme adopts blazed grating to be transferred to by dispersionless 0 grade of spectrum on more senior time.The cutting face of blazed grating is not parallel with grating face, has an angle (blazing angle), thus makes interference 0 grade of principal maximum between the very big and each groove face of the central authorities of single cutting face diffraction separately, shifts and focuses on certain one-level spectrally, realizing glittering of this grade of spectrum.Advantage is that certain diffraction efficiency of 1 grade is high, and particularly on the wavelength of its blazing angle, the most high energy of diffraction efficiency reaches 80% ~ 90%.Shortcoming is due to the flute profile characteristic of blazed grating, and high-diffraction efficiency only appears near blaze wavelength, and in its other diffraction bands, diffraction efficiency distribution is extremely uneven.
Principle of the present utility model is: angle, broadband is selected to comprise two pieces of binary phase diffraction grating and a block Bragg diffraction gratings in optical filter, when parallel input light is propagated in grating, the coupling of efficient diffraction occurs between the grating meeting certain structural parameters, and filtering does not meet the parasitic light implementation space filter function of diffraction conditions.Two pieces of binary phase diffraction grating structure parameters are consistent, one piece for dispersion one piece for compensation of dispersion, Volume Bragg grating has very high angle selective properties.Dispersion equation according to the incident binary raster of directional light:
; The Bragg condition of body grating:
; Wherein
with
be respectively the cycle of binary raster and body grating, λ is optical wavelength transmission, m=± 1, ± 2, ± 3 ... θ is binary raster secondary angle of diffraction not at the same level, i.e. Prague incident angle of body grating, sign represents the direction of diffraction up and down, and the diffraction light of same stages time has identical energy distribution; When satisfying condition:
time, namely when the binary raster cycle is the even multiples such as 2 times, 4 times of body grating cycle, after normal incidence light beam premenstrual end binary diffraction grating, the wavelength components of different order diffraction light beam is diffracted in different angles, and this angle just in time meets the Bragg condition of the incident body grating of each wavelength light beam, thus can by the efficient diffraction of body grating.This combined type invention structure makes optical grating diffraction bandwidth no longer be limited to the optical electivity restriction of Bragg grating, thus there is very wide output spectrum, the diffraction lights at different levels of binary raster are symmetrical and non-zero order diffraction light gross energy utilization factor is high, remain the angle selective properties that Bragg grating is good simultaneously, realize the function of wideband angular Choose filtering.In addition, the dispersion measure that front end binary phase grat is introduced can by rear end binary phase grat full remuneration, two pieces of binary phase grats have identical structural parameters, output beam can keep coaxial symport with normal incidence light beam, and can solve the space-time distortion that ultrashort pulse Bragg diffraction brings.Body grating filtering combines the concept of the corresponding different angle of divergence of Fourier optics medium spatial frequency, body grating, to the Bragg angle selectivity of incident light corresponding diffraction spatial domain selectivity, will realize high frequency signal filter function in " low-order mode deflection, high-order mode transmission " mode.The utility model adopts rigorous coupled wave approach method strictly to solve the relation of the structural parameters of binary phase diffraction grating, operation wavelength and diffraction efficiency at different levels; Adopt the structural parameters of Kogelnik coupled wave theory method Exact Solution body grating and the relation of Bragg diffraction efficiency.By the proportioning of design binary raster and cycle of body grating, thickness, duty when material, control operation wavelength and the spectrum width of incident light, realize any broadband light spatial filtering of number nanometer ~ hundred nanometer output function.
Compared with prior art, the utility model has following distinguishing feature:
1, binary phase diffraction grating and Volume Bragg grating combine and directly make the technical scheme being used for space optics wave filter by the utility model employing, achieve the effect of broadband light input filter, compared with traditional " 4f " spatial filter, there is the advantage that structure is simple and filtering consistance is good, and beam Propagation bore is used by binary phase diffraction grating and the parallel connection of multiple body grating device, easily meet heavy caliber light beam and high-diffraction efficiency transmission demand.
2, the utility model adopt binary phase diffraction grating and Volume Bragg grating co-ordinative construction, filter peak position and the adjustable arbitrarily spectral distribution of bandwidth is obtained by regulating cycle of grating layer, thickness and dutycycle, spectral bandwidth from a few nanometer to nanometer up to a hundred, the optional position that peak covers to near-infrared wavelength at visible ray.
3, the wideband angular that the utility model adopts selects optics filter construction all to adopt optical medium material to make, photosensitive refractive index glass is particularly adopted to make grating, it is a kind of position phase recording medium of physics and chemistry stable in properties, there is the spectral selectivity of mating very well with visible ray or near-infrared wavelength and the high feature of laser damage threshold, the optics load-bearing capacity of very big raising laser system, and device architecture is simple and easy to realize industrialization and apply.
Accompanying drawing explanation
Fig. 1 is that a kind of wideband angular that the utility model embodiment provides selects optics filter system structural profile schematic diagram;
Fig. 2 optical transmission spectra scatter chart that to be the lambda1-wavelength of the binary phase diffraction grating that the utility model embodiment 1 provides be within the scope of 750nm ~ 850nm;
Fig. 3 is that the transmitted light spectral corner of the Volume Bragg grating that the utility model embodiment 1 provides is selected and optical electivity scatter chart;
Fig. 4 transmitted light diffraction efficiency distribution curve map that to be the lambda1-wavelength of the Volume Bragg grating that the utility model embodiment 1 provides be within the scope of 750nm ~ 850nm.
Fig. 5 transmitted light diffraction efficiency distribution curve map that to be the lambda1-wavelength of angle, the broadband Choose filtering system that the present embodiment 1 provides be within the scope of 750nm ~ 850nm.
Fig. 6 is the change curve that in the broadband filter system that provides of the utility model embodiment, 0 and ± 1 order diffraction light transmission rate appear in diffraction grating;
Fig. 7 is the change curve that in the broadband filter system that provides of the utility model embodiment, 0, ± 1 and ± 2 order diffraction light transmission rates appear in diffraction grating;
Fig. 8 is the change curve that in the broadband filter system that provides of the utility model embodiment, 0, ± 1, ± 2 and ± 3 order diffraction light transmission rates appear in diffraction light;
In FIG, 11, front end binary phase diffraction grating; 12, rear end binary diffraction grating; 21a and 21b, ± body grating that 1 order diffraction is corresponding; 22a and 22b, ± body grating that 2 order diffractions are corresponding; 23a and 23b, ± body grating that 3 order diffractions are corresponding; The body grating that 24a and 24b, more senior diffraction are corresponding; 3, incident light; 4, diffraction light; 5, light is exported.
Embodiment
Below in conjunction with drawings and Examples, technical solutions of the utility model are further elaborated.
Embodiment 1
See accompanying drawing 1, it is that a kind of wideband angular that the present embodiment provides selects optics filter system structural profile schematic diagram.Parallel input light 3 forms multilevel first diffraction light 4 through first piece of binary phase diffraction grating 11 incidence, incide corresponding some Volume Bragg grating 21a and 21b respectively, 22a and 22b, in 23a and 23b, the diffraction lighting level Ci Cong center of binary phase diffraction grating increases successively to two side positions, Volume Bragg grating is placed from center to both sides from low to high successively by its screen periods, and Volume Bragg grating and binary phase diffraction grating central axis are symmetric; The second diffraction light after Volume Bragg grating transmission diffraction continues to enter second piece of binary phase diffraction grating 12, completes broadband light filtering, exports parallel output light 5.
In the present embodiment, binary diffraction grating is medium SiO
2, BK
7the upper direct etching of substrate etching, and plate MgF at substrate surface
2, the binary phase grat structure that etches of the transparent optical film material such as ZnS, ZnO carrying out; Volume Bragg grating is body diffraction optical device prepared by a kind of photaesthesia glass medium material.
Binary diffraction grating is a kind of dispersive optical element, diffraction grating material, shape, cycle, dutycycle and thickness, utilize rigorous coupled wave approach to calculate, and design according to the wavelength of incident light and the requirement of bandwidth, obtain the parameter that required broadband filter requires.
Volume Bragg grating is a kind of wavelength chooses and angle Selection element, the material of body grating, shape, cycle, dutycycle and thickness, Kogelnik coupled wave theory is utilized to carry out theoretical analysis and calculation, and require to design according to not at the same level light operation wavelength of the first diffraction light, obtain the wideband filtered characteristic requirements of broadband filter system.In the present embodiment, binary diffraction grating is etched by silica glass material to form, and the method for employing can be hologram recording method; Volume Bragg grating is prepared from by one photic temperature-sensitive refractive index glass material, and the method for employing can be that ultraviolet interferes exposure and micritization heat treatment method.
In the present embodiment, concrete step is: first determine that the wavelength of the incident light λ of broadband filter system is 750nm ~ 850nm, bandwidth is 100nm, and diffraction efficiency is greater than 90%; Again according to this target call of wave filter, determine the preparation parameter of binary phase diffraction grating and body grating respectively.
See accompanying drawing 2, it is binary diffraction grating diffration spectral transmittance curve map in angle, the broadband selective filter system that provides of the present embodiment.According to the target call of broadband filter, the material of selected binary diffraction grating is SiO
2glass medium and the order of diffraction time are ± 1, ± 2 and ± 3, utilize rigorous coupled wave approach and formula
, be 750nm ~ 850nm according to lambda1-wavelength, bandwidth is the condition that 100nm and diffraction efficiency are greater than 90%, obtains the binary diffraction screen periods 2.5 μm that the present embodiment provides, dutycycle 0.5, grating thickness 2.3 μm.Can be seen by Fig. 2, be in 750nm ~ 850nm at incident light, between non-zero order diffraction light transmission rate summation remains on 92.7% ~ 95.1% (curve 1); Accordingly ± 1 order diffraction light is between in whole spectral range, transmitance remains on 40% ~ 44.9% respectively (curve 2); Accordingly ± 2 order diffraction light are between in whole spectral range, transmitance remains on 1.9% ~ 5.1% respectively (curve 3); Accordingly ± 3 order diffraction light are between in whole spectral range, transmitance remains on 0.2% ~ 2.5% respectively (curve 4).
See accompanying drawing 3, it is the diffraction optical transmission spectra curve map that the present embodiment provides Volume Bragg grating in the selective filter of angle, broadband.According to the target call of broadband filter and the cycle of binary diffraction grating set and non-zero order time number, determine cycle and the number of Volume Bragg grating in the present embodiment, cycle is three pairs of Volume Bragg gratings of 1.25 μm, 0.625 μm and 0.417 μm respectively, three pairs of Volume Bragg gratings can be prepare on six blocks of photic temperature-sensitive refractive index glass materials respectively, also can be the body grating structures preparing three pairs of different cycles on one block of photic temperature-sensitive refractive index glass material.Can be seen by Fig. 3, the Volume Bragg grating that the present embodiment provides 1.25 μm, fotoceram matrix refractive index 1.49, refractive index modulation degree 130ppm, grating thickness 3.0mm, setting lambda1-wavelength 808nm, corresponding Bragg angle is 18.86 degree.Peak value diffraction efficiency reaches 99.9%, and the full widths at half maximum degree of wavelength chooses is 1.21nm, and corresponding angle Selection is 0.51mrad.Volume Bragg grating has high-sensitive angle selective properties.Result of calculation also shows, cycle of body grating be 0.625 μm and 0.417 μm time, the corresponding peak value diffraction efficiency of body grating reaches more than 99%.
See accompanying drawing 4, it is that the present embodiment provides the diffraction efficiency curve of the Volume Bragg grating in the selective filter of angle, broadband within the scope of bandwidth 100nm.The body grating parameter that the present embodiment provides is consistent with the parameter in accompanying drawing 3.Can be seen by Fig. 4, be within the scope of 750 ~ 850nm in incident light spectrum, transmission diffraction efficiency remains between 99.1% ~ 99.9%.
See accompanying drawing 5, it is the diffraction efficiency curve that the present embodiment provides angle, broadband Choose filtering system.Consistent with in accompanying drawing 2 of the binary phase diffraction grating parameter that the present embodiment provides, consistent with in accompanying drawing 3 of the body grating parameter provided.Can be seen by Fig. 5, the filtering system that the present embodiment provides is when lambda1-wavelength is 750 ~ 850nm, bandwidth 100nm scope, and the diffraction efficiency of system reaches 92% ~ 95%, meets the target call of wideband filtered default.
Embodiment 2
In angle, the broadband selective filter that the present embodiment provides, binary diffraction grating diffration level time is 0 and ± 1 grade, and its structure is as embodiment 1.See accompanying drawing 6, it is that in angle, the broadband selective filter that provides of the present embodiment, 0 and the transmittance curve figure that changes with grating thickness of ± 1 order diffraction light appear in binary diffraction grating.Can be seen by Fig. 6, the binary diffraction screen periods that the present embodiment provides 1.0 μm, dutycycle 0.45, lambda1-wavelength is 808nm.Diffraction light transmitance at different levels presents cycle variation law with grating thickness change.Grating thickness within the scope of 0.02 μm ~ 4.0 μm, total transmitance of transmitted light remain on 0.94 ~ 0.96 between (curve 1); Grating thickness is respectively 0.72 μm, 2.2 μm and 3.64 μm time, the zero level transmitted light not possessing dispersive power accordingly occurs that minimum value is respectively 13.9%, 14.5% and 15.3%(curve 2); Accordingly ± 1 order diffraction light transmission rate maximal value is 41%(curve 3); The maximal value of corresponding non-zero order diffraction light summation is 82%(curve 4).
Embodiment 3
The present embodiment to provide in the selective filter of angle, broadband binary diffraction grating diffration level time to be 0, ± 1 and ± 2 grades, its structure is as embodiment 1.See accompanying drawing 7, it is that the present embodiment provides binary diffraction grating appearance 0 in the selective filter of angle, the broadband, ± 1 transmittance curve figure changed with grating thickness with ± 2 order diffraction light.Can be seen by Fig. 7, the binary diffraction screen periods that the present embodiment provides 1.25 μm, dutycycle 0.45, lambda1-wavelength is 808nm.Diffraction light transmitance at different levels presents cycle variation law with grating thickness change.Grating thickness within the scope of 0.02 μm ~ 4.0 μm, total transmitance of transmitted light remain on 0.953 ~ 0.98 between (curve 1); Grating thickness is respectively 0.82 μm and 2.46 μm, the zero level transmitted light not possessing dispersive power accordingly occur minimum value be respectively 4.3% and 3.8%(curve 2); Accordingly ± 1 order diffraction light transmission rate maximal value be respectively 44.1% and 43.65%(curve 3); Accordingly ± 2 order diffraction light transmission rate maximal values are 2.55%(curve 4); The maximal value of corresponding non-zero order diffraction light summation be respectively 93.22% and 92.3%(curve 5).
Embodiment 4
In angle, the broadband selective filter that the present embodiment provides, binary diffraction grating diffration level time is 0, ± 1 and ± 2 grades, its structure is as embodiment 1.See accompanying drawing 8, it is that the present embodiment provides binary diffraction grating appearance 0 in the selective filter of angle, the broadband, ± 1 transmittance curve figure changed with grating thickness with ± 2 order diffraction light.Can be seen by Fig. 8, the binary diffraction screen periods that the present embodiment provides 2.5 μm, dutycycle 0.5, lambda1-wavelength is 808nm.Diffraction light transmitance at different levels changes with grating thickness.Grating thickness within the scope of 0.02 μm ~ 4.0 μm, total transmitance of transmitted light remain on 0.958 ~ 0.97 between (curve 1); When grating thickness is respectively 0.84 μm and 2.34 μm, the zero level transmitted light not possessing dispersive power accordingly occur minimum value be respectively 2.5% and 0.2%(curve 2); Accordingly ± 1 order diffraction light transmission rate maximal value be respectively 37.89% and 45%(curve 3); Accordingly ± 2 order diffraction light transmission rate maximal values be respectively 4% and 1.52%(curve 4); Accordingly ± 3 order diffraction light transmission rate maximal values be respectively 4.4% and 1.03%(curve 5); The maximal value of corresponding non-zero order diffraction light summation be respectively 92.54% and 95.1%(curve 6).Visible, the binary raster diffraction gross energy with more senior diffraction is higher.
See table 1, it is the diffraction light transmitance at different levels of three kinds of time diffraction lights not at the same level and the result of calculation of non-zero order diffraction summation in the binary phase diffraction grating that provides of embodiment 2,3 and 4.Can be seen by form 1, there is more senior time diffraction light in binary phase diffraction grating, Zero-order diffractive light transmission rate is lower, and screen periods corresponding to more senior diffraction light is larger, is more beneficial to the preparation of binary raster and body grating device.
Table 1
。
Claims (4)
1. wideband angular selects an optical filter, it is characterized in that its filtering system comprises binary phase diffraction grating and the Volume Bragg grating of time distribution of asymmetrical diffraction level; Its structure is: along the direction of propagation of the broadband light of parallel incidence, broadband light first incides front end binary phase diffraction grating, after time light splitting of asymmetrical diffraction level, enter in the Volume Bragg grating of respective stages time distribution respectively, rear end binary phase diffraction grating is incided after carrying out corresponding angle Selection by Volume Bragg grating again, will through the parallel output of filtered broadband light; The structure of described front-end and back-end binary phase diffraction grating is consistent, and the shape of its grating is rectangle grizzly bar, and grating diffration lighting level Ci Cong center increases successively to two side positions; Described Volume Bragg grating is placed from center to both sides from low to high successively by its screen periods, and Volume Bragg grating and binary phase diffraction grating central axis are symmetric.
2. a kind of wideband angular according to claim 1 selects optical filter, it is characterized in that: the screen periods of described front-end and back-end binary phase diffraction grating is tens nanometers ~ several microns, dutycycle is 0.1 ~ 0.9, and grating thickness is tens nanometers ~ several microns.
3. a kind of wideband angular according to claim 1 selects optical filter, it is characterized in that: the screen periods of described Volume Bragg grating is tens nanometers ~ several microns, and dutycycle is 1:1, and grating thickness is 1 millimeter ~ several millimeters.
4. a kind of wideband angular according to claim 1 selects optical filter, it is characterized in that: the number of described Volume Bragg grating is secondary corresponding with the non-zero order of diffraction of the binary phase diffraction grating time number order of diffraction.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104570378A (en) * | 2015-01-12 | 2015-04-29 | 苏州大学 | Broadband angle selection optical fiber and preparation method thereof |
| CN105425330A (en) * | 2015-12-17 | 2016-03-23 | 苏州大学 | Wave-front correction structure based on volume holographic device |
| CN106772754A (en) * | 2016-12-21 | 2017-05-31 | 南开大学 | Terahertz polarization conversion and the one-way transmission device of two-layered medium metal grating structure |
| CN110780452A (en) * | 2019-11-18 | 2020-02-11 | 北京华捷艾米科技有限公司 | Diffraction optical assembly with adjustable diffraction light spot pattern, projection device and diffraction method |
| CN112485802A (en) * | 2020-11-24 | 2021-03-12 | 中国科学院光电技术研究所 | Method for matching transmitting and receiving wavelengths of laser radar |
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2015
- 2015-01-12 CN CN201520018178.9U patent/CN204360027U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570378A (en) * | 2015-01-12 | 2015-04-29 | 苏州大学 | Broadband angle selection optical fiber and preparation method thereof |
| CN104570378B (en) * | 2015-01-12 | 2017-02-22 | 苏州大学 | Broadband angle selection optical fiber and preparation method thereof |
| CN105425330A (en) * | 2015-12-17 | 2016-03-23 | 苏州大学 | Wave-front correction structure based on volume holographic device |
| CN106772754A (en) * | 2016-12-21 | 2017-05-31 | 南开大学 | Terahertz polarization conversion and the one-way transmission device of two-layered medium metal grating structure |
| CN106772754B (en) * | 2016-12-21 | 2019-03-05 | 南开大学 | The conversion of two-layered medium-metal grating structure terahertz polarization and one-way transmission device |
| CN110780452A (en) * | 2019-11-18 | 2020-02-11 | 北京华捷艾米科技有限公司 | Diffraction optical assembly with adjustable diffraction light spot pattern, projection device and diffraction method |
| CN110780452B (en) * | 2019-11-18 | 2021-09-21 | 北京华捷艾米科技有限公司 | Diffraction optical assembly with adjustable diffraction light spot pattern, projection device and diffraction method |
| CN112485802A (en) * | 2020-11-24 | 2021-03-12 | 中国科学院光电技术研究所 | Method for matching transmitting and receiving wavelengths of laser radar |
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