CN1252529A - Holographic narrow-band band-elimination optical filter and its manufacture - Google Patents
Holographic narrow-band band-elimination optical filter and its manufacture Download PDFInfo
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Abstract
On the glass substrate, a medium layer, i. e., a dichromate gelatine layer with reflected holographic diffraction layer is painted. Over the dichromate gelatine layer, are painted epoxy resin layer and adhered packing glass. The present invention features that the reflected holographic diffraction layer made up by dichromate gelatine layer has refractivity modulated degree n/(z) and the variation of refractivity with spatial frequency is distributed according to a certain law. The narrow-band band-stop optical filter made based on the said distribution law has a semi-width below 10 nm and a optical density over 6D.
Description
The present invention relates to a kind of optical filter.
In the prior art, narrow-band band-elimination optical filter is studied in spectroscopy, particularly in the research of Raman spectrum important use is arranged.Its principal character be in certain spectral band a certain wavelength of elimination and near spectral line among a small circle, and the light of other wavelength is seen through with high as far as possible transmitance.Its main optical property index is represented with the optical density (OD) of centre wavelength and the half width of wavelength and transmitance relation.In many application of narrow-band band-elimination optical filter, particularly in the research of Raman spectrum, optical density (OD) is high more, and half width is narrow more, and then its performance is good more.Generally, the performance requirement of this optical filter be optical density (OD) greater than 4D, half width is less than 25 nanometers.The method for making of band resistance optical filter has many kinds, mainly contain dyestuff absorption, multilayer dielectric coating (interference filter) and reflection holography optical filter, wherein dyestuff is absorptive-type is difficult to reach the narrow-band band-elimination optical filter requirement, and interference filter is difficult to reach high optical density (OD), usually the optical density (OD) of (20nm) is 2D under narrow bandwidth, and the interference filter cost of manufacture is relatively high on the other hand.
In the reflection holography optical filter, utilizing reflection diffracting light promptly is bandpass filter, and utilizing transmitted light promptly is band resistance optical filter.The application of reflection holography optical filter is also embodied in logical and band resistance two aspects of band.The diffraction efficiency of existing arrowband bandpass filter is between 50% to 90%, and its transmitted light can not satisfy the requirement of high optical density (OD), and diffraction efficiency often has lobe to occur with the wavelength change curve, influences filtering performance; The transmitted light of broadband bandpass filter obviously is not suitable for the requirement of narrow-band band-elimination optical filter, and the situation of its manufacturing technology and narrow-band band-elimination optical filter is very different; The holographic laser protective glasses is and more approaching a kind of of narrow-band band-elimination optical filter, but laser light protective goggles generally has the protection angle requirement, and characteristic half width is everlasting more than the 35nm; What people were concerned about in other some reflection holography elements (as the holographic optical coupling mechanism in holographic head-up display, the night vision device etc.) is the optical imaging performance, and special spectral characteristic does not often take in manufacture craft.
Certain coverage diagram is relevant with the distribution of the index modulation of holographic recording medium, and the distribution of index modulation is relevant with the manufacture craft of reflection holography.Body holographic theory the earliest---uniform dielectric coupled wave theory and experimental result have than big-difference, and can not obtain narrow-band band-elimination optical filter by this theory.Carry out having of effective work on theoretical and technology at present: T.Kubota is (referring to T.Kubota, Controlof the reconstruction wavelength of Lippmann holograms recorded indichromated gelatin, Appl.Opt.1989,28 (10): 1845～1894) uniform dielectric coupled wave theory and experimental result are not inconsistent have carried out successful explanation, he thinks that the distribution at medium inner refractive index degree of modulation and fringe density is uneven, he utilizes the coupledwave equation of nonhomogeneous media to derive the Recatti equation of relevant diffraction efficiency, on the non-homogeneous model based of supposition, equation is carried out numerical solution obtained the diffraction efficiency notional result that conforms to substantially with experimental result.P.G.Boj is (referring to P.G.Boj, J.Crespo, and J.A.Quintana, Broadband reflection holograms in dichromatedgelatin, Appl.Opt., 1992,31 (17): 3302～3305) utilize the method for Kubota to set up themselves model, analyzed the experimental result of their broadband reflection holography, the photo that utilizes electron microscope to take has confirmed the heterogeneity of recording medium inside, this is a kind of broadband reflection holographic element, is not suitable for the narrow-band band-elimination optical filter of requirement of the present invention.Dahe Liu etc. are (referring to Daho Liu, Jing Zhou, Nonlinear analysis for reflection hologram, Optics Communication, 1994,107:471～479) also set up a kind of special non-homogeneous model, and analyzed the experimental result of their technology making, this is a kind of narrowband reflection bandpass filter, and its defective is that optical density (OD) is lower.Because the complicacy of (bichromate gelatin) treatment process, the experimental result that the different experiments chamber draws is had nothing in common with each other, and non-homogeneous model also has nothing in common with each other.
The object of the present invention is to provide a kind of optical density (OD) greater than 4D, bandwidth holographic narrow-band band-elimination optical filter and manufacture craft thereof less than 20 nanometers.
Technical scheme of the present invention is: a kind of holographic narrow-band band-elimination optical filter, be coated with one deck dielectric layer on the glass substrate, this dielectric layer is the (bichromate gelatin) layer that has write down the interference fringe that is parallel to the dielectric layer surface, be coated with epoxy resin layer on the described (bichromate gelatin) layer, be adhesively fixed with mounting glass on the described epoxy resin layer, the refractive index modulation degree n1 (z) of the reflection holography diffracting layer of being made by the (bichromate gelatin) layer, the change G (z) of variations in refractive index spatial frequency distribute by following formula:
Wherein: T is a thickness of dielectric layers, the z axle is parallel with the dielectric layer normal direction, get z=0 at the interface at dielectric layer and glass substrate, get z=T at the interface at dielectric layer and epoxy resin layer, refractive index modulation degree when n1 is z=T, the ratio of refractive index modulation degree when p is z=0 and n1, empty when G0 is z=0 frequently with respect to average empty variation frequently, Δ G is empty average relatively frequently empty maximum variable quantity frequently; R and s represent the power that n1 (z) and G (z) change with z respectively.
For refractive index modulation degree n1 (z), the change G (z) of variations in refractive index spatial frequency that reaches the above-mentioned reflection holography diffracting layer of being made by the (bichromate gelatin) layer distributes by described formula, the manufacture craft of described holographic narrow-band band-elimination optical filter comprises the following steps:
(1), preparation (bichromate gelatin) liquid;
(2), upward painting photosensitive liquid at glass substrate [2], dry under the condition of Celsius temperature 15-25 degree behind the levelling, form dielectric layer;
(3), under dark room conditions, dielectric layer is carried out holographic recording:
A: regulate the beam intensity ratio of two bundle coherent lights, making two-beam is 1 in the beam intensity ratio of (bichromate gelatin) and air contacting surface by force;
B: overexposure on described (bichromate gelatin) layer, exposure are that every square centimeter of 100-250 milli is burnt;
(4), in the darkroom, the dichromic acid gelatin layer is carried out photographic fixing post bake and development;
(5), the dielectric layer after will dewatering is used hot blast drying rapidly;
(6), the mounting glassy layer is glued on the (bichromate gelatin), make described (bichromate gelatin) layer and air insulated with epoxy resin.
Utilization of the present invention is similar to the theoretical method of Kubota and has designed the interior refractive index modulation degree distribution of reflection holography recording medium, utilize the gelatine bichromate holographic recording material to invent the treatment process that adapts with it for realizing this distribution, this invention has the following advantages:
(1) refractive index modulation degree of the index modulation layer of the present invention's design distributes and can eliminate the lobe effect of spectral pattern, be complementary with technology of the present invention, the half width of the narrow-band band-elimination optical filter of making by this regularity of distribution is below 10nm, and optical density can reach more than the 6D.
(2) treatment process that adapts with the distribution of the present invention design is simple and easy to do, and success ratio is higher, and the control peak wavelength is accurate.
The invention will be further described below in conjunction with drawings and Examples:
Accompanying drawing 1 is a product structure cut-open view of the present invention; Wherein:
[1], (bichromate gelatin) layer; [2], glass substrate; [3], epoxy resin layer; [4], mounting glass;
Accompanying drawing 2 is the recording beam path figure of holographic filter;
Accompanying drawing 3 is the measurement index path of reflection holography;
Diffraction efficiency empirical curve when accompanying drawing 4 is T=20 μ m and its corresponding theory curve, solid line wherein is an empirical curve, dotted line is a theoretical curve;
Diffraction efficiency empirical curve when accompanying drawing 5 is T=30 μ m and its corresponding theory curve, solid line wherein is an empirical curve, dotted line is a theoretical curve;
Diffraction efficiency empirical curve when accompanying drawing 6 is T=40 μ m and its corresponding theory curve, solid line wherein is an empirical curve, dotted line is a theoretical curve;
Accompanying drawing 7 has provided the diffraction efficiency curve of p=1;
Accompanying drawing 8 has provided the diffraction efficiency curve of p=0.5;
Accompanying drawing 9 has provided the diffraction efficiency curve of p=0.1;
Accompanying drawing 10 has provided the graph of a relation of peak value diffraction efficiency and bondline thickness T;
Accompanying drawing 11 has provided the graph of a relation of peak value diffraction efficiency and largest refractive index degree of modulation n1;
Accompanying drawing 12 has provided the graph of a relation of half width Δ λ h and bondline thickness T;
Accompanying drawing 13 has provided the graph of a relation of half width Δ λ h and largest refractive index degree of modulation n1;
When accompanying drawing 14 has provided r=1 wait η line (η=0.9999) and etc. Δ λ h line (Δ λ h=20nm) graph of a relation;
When accompanying drawing 15 has provided r=2 wait η line (η=0.9999) and etc. Δ λ h line (Δ λ h=20nm) graph of a relation;
When accompanying drawing 16 has provided r=3 wait η line (η=0.9999) and etc. Δ λ h line (Δ λ h=20nm) graph of a relation;
Accompanying drawing 17 has provided the family curve of the embodiment one of refractive index modulation degree distribution and fringe density distribution design;
Accompanying drawing 18 has provided the family curve of the embodiment two of refractive index modulation degree distribution and fringe density distribution design;
Embodiment: referring to accompanying drawing 1, a kind of holographic narrow-band band-elimination optical filter, glass substrate is coated with one deck dielectric layer on [2], this dielectric layer is the (bichromate gelatin) layer [1] that has write down the interference fringe that is parallel to the dielectric layer surface, be coated with epoxy resin layer [3] on the described (bichromate gelatin) layer [1], be adhesively fixed with mounting glass [4] on the described epoxy resin layer [3], the refractive index modulation degree n1 (z) of the reflection holography diffracting layer of being made by (bichromate gelatin) layer [1], the change G (z) of variations in refractive index spatial frequency distribute by following formula:
Wherein: T is a thickness of dielectric layers, the z axle is parallel with the dielectric layer normal direction, get z=0 at the interface at dielectric layer and glass substrate [2], get z=T at the interface at dielectric layer and epoxy resin layer [3], refractive index modulation degree when n1 is z=T, the ratio of refractive index modulation degree when p is z=0 and n1, empty when G0 is z=0 frequently with respect to average empty variation frequently, Δ G is empty average relatively frequently empty maximum variable quantity frequently; R and s represent the power that n1 (z) and G (z) change with z respectively.
For the change G (z) that satisfies described refractive index modulation degree n1 (z), variations in refractive index spatial frequency distributes by above-mentioned formula, the manufacture craft of holographic narrow-band band-elimination optical filter comprises the following steps:
(1), preparation (bichromate gelatin) liquid:
A: gelatin is put into deionized water soak, until the complete imbibition of gelatin;
B: whisking gelatin under the condition of Celsius temperature 70-80 degree forms gelatin solution until dissolving fully;
C: in the gelatin solution of Celsius temperature 49-51 degree, add ammonium dichromate solution, make (bichromate gelatin) sensitization liquid;
D: the filtrator with 0.2 micron pore size filters described sensitization liquid, and eliminates the bubble in the described sensitization liquid;
(2), the glass substrate [2] of Celsius temperature 65-75 degree is positioned on the levelling bench, more described sensitization liquid is poured on the glass substrate [2], smoothens, dry under the condition of Celsius temperature 15-25 degree behind the natural levelling, form dielectric layer;
(3), under dark room conditions, dielectric layer is carried out holographic recording:
A: regulate the beam intensity ratio of two bundle coherent lights, making two-beam is 1 in the beam intensity ratio of (bichromate gelatin) and air contacting surface by force;
B: excessive exposure on described (bichromate gelatin) layer, exposure are that every square centimeter of 100-250 milli is burnt;
(4), in the darkroom, the dichromic acid gelatin layer is carried out photographic fixing and development;
(5), the dielectric layer hot blast drying after will dewatering;
(6), mounting glassy layer [4] is glued on the (bichromate gelatin), make described (bichromate gelatin) layer and air insulated with epoxy resin.
Described technology of in the darkroom dichromic acid gelatin layer being carried out photographic fixing and development comprises:
A: the water with Celsius temperature 15-25 degree washes described dielectric layer, then the described dielectric layer of flushing in deionized water;
B: photographic fixing post bake: described dielectric layer was immersed in the F5 stop bath post bake 1-5 minute, again with the water flushing of temperature 15-25 degree;
C: develop for the first time: described dielectric layer immerses that concentration is 50%, Celsius temperature is in the isopropyl alcohol of 23-27 degree, dewaters 2-5 minute;
D: second development: described dielectric layer immerses that concentration is 70%, Celsius temperature is in the isopropyl alcohol of 23-27 degree, dewaters 25 minutes;
E: develop for the third time: it is that 90-100%, Celsius temperature are in the isopropyl alcohol of 23-27 degree that described dielectric layer immerses concentration, dewaters 2-5 minute.
The concentration of described gelatin solution is to contain 5-6 gram gelatin in per 100 ml deionized water; Add the 14-17 ml concn in described per 100 milliliters of gelatin solutions and be 5% dichromic acid by solution.
Referring to accompanying drawing 2 dielectric layer is carried out holographic recording optical path figure, wherein: B.S. is a beam splitter, and M1 and M2 are catoptrons, and SF1 and SF2 are spatial filters, L1 and L2 are collimation lens, DCG is a (bichromate gelatin) record dry plate.Recording laser is the laser of the 488nm of Argon ion laser, and interference fringe is parallel to dielectric surface.
The measurement light path of reflection holography as shown in Figure 3, whole optical path place one the rotation optical bench on.White point light source S is incident to testing element HOE behind lens L3 collimation, HOE is placed in the rotating shaft of rotation optical bench, diffraction light is assembled to the incidence window of integrating sphere I S through L4, another window of integrating sphere I S meets monochromator M and photomultiplier PMT, amplifier A amplifies photomultiplier tube signal, computing machine C control monochromator M scanning and the signal of exporting by A/D plate reception amplifier A.During measurement, earlier HOE is removed, make two arms of optical bench in alignment, the spectral signal of testing light source, and then measure diffracted signal by Fig. 3.Computing machine obtains diffraction efficiency with the wavelength change curve with diffracted signal and light signal after relatively.Adopting integrating sphere in this light path is in order to reduce in twice signal measurement because the errors that the light path difference is brought.
If T is a dielectric thickness, z axle and medium method be to parallel, gelatin and glass get z=0 at the interface, get z=T at the interface at gelatin and air.Can be obtained by experimental result: refractive index modulation degree n1 (z) increases with z is dull; Empty relative variation G (z)=[f (z)-f0]/f0 frequently reduces with the z dullness, and wherein f0 is the mean space frequency, and f (z) is frequently empty for the z place.Document [1] (T.Kubota, Control of the reconstructionwavelength of Lippmann holograms recorded in dichromated gelatin, Appl.Opt.1989,1845～1894) and document [2] (P.G.Boj 28 (10):, J.Crespo, and J.A.Quintana, Broadband reflection holograms in dichromated gelatin, Appl.Opt., 1992,31 (17): 3302～3305) second derivative that draws n1 (z) is less than zero, and promptly curve is to recessed.And theory of the present invention and experiment analysis results be the second derivative of n1 (z) greater than zero, promptly curve is to fovea superior.Can get following non-homogeneous model according to above main points:
Wherein n1 is the refractive index modulation degree of z=T face, and p is the refractive index modulation degree of z=0 face and the ratio of n1; G0 is empty frequently with respect to average empty variation frequently on the z=0 face, and Δ G is empty average relatively frequently empty maximum variable quantity frequently; R and s represent the power that n1 (z) and G (z) change with z respectively, the non-homogeneous characteristic of reflection medium, and they are relevant with thickness of dielectric layers and treatment process.
Accompanying drawing 4, accompanying drawing 5, accompanying drawing 6 have provided diffraction efficiency empirical curve and its corresponding theory curve of T=20 μ m, 30 μ m and 40 μ m respectively, λ in accompanying drawing 4, accompanying drawing 5, the accompanying drawing 6 is to be the lambda1-wavelength of unit with the nanometer, η is a diffraction efficiency, solid line among the figure is an empirical curve, and dotted line is a theoretical curve.Because reflection, absorption, the scattering of glass and gelatin are influential to diffraction efficiency, so should revise in proportion theoretical diffraction efficiency by empirical curve during Theoretical Calculation.The parameter of above-mentioned (1) formula and above-mentioned (2) formula is taken as respectively: accompanying drawing 4:n1=0.043, p=0.15, G0=0.008, Δ G=0.01, r=2, s=1; Accompanying drawing 5:n1=0.043, p=0.05, G0=0.008, Δ G=0.01, r=3, s=1; Accompanying drawing 6, n1=0.045, p=0.05, G0=0.008, Δ G=0.01, r=3, s=1.
From finding out that with upper curve theoretical curve does not have secondary peak substantially, coincide better with empirical curve, and see that from selected parameter the decay of refractive index modulation degree in medium is very fast, and the thick more decay of medium is fast more, be that T is big more, the also corresponding increase of r, in the medium to diffraction efficiency contribution bigger only at dielectric surface.Situation lower curve in the narrowband reflection holography is symmetrical substantially, and the variation of fringe density is very little.
The key property of narrow-band band-elimination optical filter is low peak transmitance and narrow bandwidth, can draw peak transmittance from diffraction efficiency from principle of complementarity when theory is calculated.Below analyze the heteropical relation of bandwidth, diffraction efficiency and medium theoretically.
(1) lobe of diffraction efficiency curve.Accompanying drawing 7, accompanying drawing 8, accompanying drawing 9 have provided the diffraction efficiency curve of p=1, P=0.5, P=0.1 respectively, wherein, and n1=0.03, T=20 μ m, G0=0, Δ G=0, r=1, λ in accompanying drawing 7, accompanying drawing 8, the accompanying drawing 9 is to be the lambda1-wavelength of unit with the nanometer, the η diffraction efficiency, lobe reduces when accompanying drawing finds out that p reduces, and lobe disappears substantially during p=0.1, and p=0.1 is also identical substantially with empirical curve, so be representative value with p=0.1 in the following Theoretical Calculation.Under other r values, similar results is arranged also.
In (4), get the representative value of the empirical curve of accompanying drawing 4, accompanying drawing 5, accompanying drawing 6: G0=0, Δ G=0 and p=0.1 in following calculating (2).
(2) peak value diffraction efficiency.Shown in accompanying drawing 10 and accompanying drawing 11, r is the power that n1 (z) changes with z to the relation of peak value diffraction efficiency and (bichromate gelatin) layer thickness T (the μ m of unit) and largest refractive index degree of modulation n1 respectively.Obviously, the relation of η and T and n1 is the monotone increasing relation, and under the identical condition of other conditions, r is big more, and η is more little.
(3) half width of diffraction efficiency curve is referring to accompanying drawing 12 and accompanying drawing 13.The relation of half width Δ λ h and (bichromate gelatin) layer thickness T (the μ m of unit) and largest refractive index degree of modulation n1 is shown in accompanying drawing 12 and accompanying drawing 13, and the r in the accompanying drawing is the power that n1 (z) changes with z.Shown the variation relation of Δ λ h (nm of unit) with T in the accompanying drawing 12, though this relation is not strict monotonic relationshi, the half width in monotony interval changes little, can regard monotone increasing as generally.It should be noted that especially nonhomogeneous media and uniform dielectric have a great difference here, Δ λ h is with the T monotone decreasing during r=0, and r＞0 an o'clock Δ λ h increases progressively with T.Accompanying drawing 13 shows Δ λ h with the n1 monotone increasing, and reduces with the increase of r.
(4) diffraction efficiency and bandwidth, referring to accompanying drawing 14, accompanying drawing 15, accompanying drawing 16, half width is Δ λ h, the (bichromate gelatin) layer thickness is T (the μ m of unit), the largest refractive index degree of modulation is n1, the peak value diffraction efficiency is η, and significant theoretical analysis is half width Δ λ h (nm of unit) under the more same peak value diffraction efficiency or the peak value diffraction efficiency under the same half width.Accompanying drawing 14, accompanying drawing 15, accompanying drawing 16 provided respectively under r=1,2,3 situations etc. η line (η=0.9999) and etc. Δ λ h line (Δ λ h=20nm), the power that to be n1 (z) change with z of r wherein.Obviously analyze the monotonicity obtain as can be known by above (2) and (3), n1 and T are above waiting η line during value, diffraction efficiency is all greater than 0.9999, the value half width is all less than 20nm below waiting Δ λ h line, between these two lines value can satisfy simultaneously peak transmittance less than 10-4 and half width less than 20nm.Comparative drawings figs 14, accompanying drawing 15, accompanying drawing 16 3 sets of curves find out that r is more little, and two pairing T of line intersection point are more little, and the area of two line encirclements is big more.
By above empirical curve and theoretical model as can be known, improve the narrow-band-filter piece performance and can not only consider that from increasing the (bichromate gelatin) layer thickness increase of thickness might not improve filter performance, and increase the thick meeting of glue and bring difficulty for coating and processing.If can make the r value of glue-line less on the technology, so just can under less thickness, obtain the optical filter of high-level efficiency narrow bandwidth.
It below is the example of several refractive index modulation degree distributions and fringe density distribution design
Embodiment one: get n1=0.016, and p=0.1, r=1, T=80 μ m, G0=0, Δ G=0, λ are to be the lambda1-wavelength of unit with the nanometer, and the peak value diffraction efficiency is η, and the optical density (OD) that obtains is greater than 6D, and half width is less than 9nm, and the theoretical characteristics curve is seen accompanying drawing 17.
Embodiment two: get n1=0.037, p=0.1, r=3, T=50 μ m, G0=0, Δ G=0, λ are to be the lambda1-wavelength of unit with the nanometer, and the peak value diffraction efficiency is η, the optical density (OD) that obtains is greater than 4D, half width is less than 20nm, and the theoretical characteristics curve is seen accompanying drawing 18, tests resulting family curve and the theoretical characteristics curve is identical substantially.
By above distribution design as can be known, the key of realization narrow-band band-elimination optical filter optical property is how to realize the non-uniform Distribution of refractive index modulation degree by designing requirement on technology.(bichromate gelatin) refractive index modulation degree after the aftertreatment distributes relevant with many factors, these factors mainly contain: the pre-hardening degree of (bichromate gelatin), the contrast distribution of the interference fringe that writes down in the (bichromate gelatin), the exposure of (bichromate gelatin), the aftertreatment of (bichromate gelatin).(bichromate gelatin) pre-hardening wherein and aftertreatment are again with all multifactor relevant.Since (bichromate gelatin) prepare the multifactor complicacy that is mutually related with aftertreatment, the making of (bichromate gelatin) holographic optical elements (HOE) is difficult in and obtains the on all four optical element of performance under the certain process conditions, has only the element making that just can finish batch by continuous adjusting process parameter.It is considered herein that following factor is the key factor of making narrow-band band-elimination optical filter:
(1) coating temperature and pre-hardening.Baking temperature when the pre-hardening of (bichromate gelatin) and (bichromate gelatin) coating has confidential relation, and the hardenability of the general low more (bichromate gelatin) of baking temperature is high more, and identical with treatment conditions as later exposure, the refractive index modulation degree of gelatin is more little so.Compare with other pre-hardening methods of (bichromate gelatin), as baking and pre-exposure before exposing, the control baking temperature is more effective, convenient and have a better repeatability.The pre-hardening degree of certain (bichromate gelatin) cooperates the non-uniform Distribution situation that can effectively control refractive index modulation degree with other technologies of back, and r value and pre-hardening in the theory design have sizable relation.
(2) control of fringe contrast.By above Design Theory as can be known, the highest in gelatin surface refractive index degree of modulation, though this phenomenon has many factors to cause, the contrast of interference fringe has considerable influence during exposure to this.In the present invention, press the transmitance of (bichromate gelatin) to employing laser, the beam intensity ratio of two bundle coherent lights in the light path shown in the control accompanying drawing 2, the beam intensity ratio that makes (bichromate gelatin) and air contacting surface is 1.
(3) light exposure control.Sclerosis before exposure and the gelatin aftertreatment is relevant with final refractive index modulation degree, also is the heteropical importance of control refractive index modulation degree.Adopt than controlling heterogeneity as a factor among the present invention by big 2 to the 3 times metering method that exposes completely of the common exposure of Calculation of Sensitivity.
(4) the mutual coordination control of pre-hardening and photographic fixing post bake.Can control the heterogeneity of refractive index modulation degree and refractive index modulation degree effectively with F5 stop bath post bake gelatin, this post bake effect is relevant with the pre-hardening of (bichromate gelatin).Coordination between the two is except that outside the Pass having with refractive index modulation degree n1, and is importantly relevant with the p in the theoretical relationship, so aftertreatment and prevulcanized coordination control also are the key factors of making narrow-band band-elimination optical filter.
(5) spatial frequency variation of the index distribution in theoretical relational expression part is smaller to the performance impact of optical filter, this variation often influences is characteristic symmetry and peak wavelength is slightly changed, symmetry is little to the performance impact of optical filter, and the variation of peak wavelength can be corrected by light path.Empty frequently variation that refractive index distributes do not have technology controlling and process among the present invention.
With two peak wavelength differences shown in the accompanying drawing 1 is that 0 to 2 nanometer, half width difference are that the narrow-band band-elimination optical filter gelatin surface of 0 to 3 nanometer glues together relatively, and available can better narrow-band band-elimination optical filter.
Claims (7)
1, a kind of holographic narrow-band band-elimination optical filter, glass substrate is coated with one deck dielectric layer on [2], this dielectric layer is the (bichromate gelatin) layer [1] that has write down the interference fringe that is parallel to the dielectric layer surface, be coated with epoxy resin layer [3] on the described (bichromate gelatin) layer [1], be adhesively fixed with mounting glass [4] on the described epoxy resin layer [3], it is characterized in that: the refractive index modulation degree n1 (z) of the reflection holography diffracting layer of being made by (bichromate gelatin) layer [1], the change G (z) of variations in refractive index spatial frequency distribute by following formula:
Wherein: T is a thickness of dielectric layers, the z axle is parallel with the dielectric layer normal direction, get z=0 at the interface at dielectric layer and glass substrate [2], get z=T at the interface at dielectric layer and epoxy resin layer [3], refractive index modulation degree when n1 is z=T, the ratio of refractive index modulation degree when p is z=0 and n1, empty when G0 is z=0 frequently with respect to average empty variation frequently, Δ G is empty average relatively frequently empty maximum variable quantity frequently; R and s represent the power that n1 (z) and G (z) change with z respectively.
2, holographic narrow-band band-elimination optical filter according to claim 1 is characterized in that: with two peak wavelength differences is that 0 to 2 nanometer, half width difference are that the holographic narrow-band band-elimination optical filter gelatin surface of 0 to 3 nanometer glues together relatively.
3, a kind of manufacture craft that is used for holographic narrow-band band-elimination optical filter, it is characterized in that: it comprises the following steps:
(1), preparation is as the (bichromate gelatin) liquid of sensitization liquid;
(2), described sensitization liquid is coated on the glass substrate [2], dry under the condition of Celsius temperature 15-25 degree behind the levelling, form dielectric layer;
(3), under dark room conditions, dielectric layer is carried out holographic recording:
A: regulate the beam intensity ratio of two bundle coherent lights, making two-beam is 1 in the beam intensity ratio of (bichromate gelatin) and air contacting surface by force;
B: excessive exposure on described (bichromate gelatin) layer, exposure are that every square centimeter of 100-250 milli is burnt;
(4), in the darkroom, the dichromic acid gelatin layer is carried out photographic fixing post bake and development;
(5), the dielectric layer hot blast drying after will dewatering:
(6), mounting glassy layer [4] is glued on the (bichromate gelatin), make described (bichromate gelatin) layer and air insulated with epoxy resin.
4, the manufacture craft of holographic narrow-band band-elimination optical filter according to claim 3 is characterized in that: the technology of in the darkroom dichromic acid gelatin layer being carried out photographic fixing post bake and development comprises:
A: the water with Celsius temperature 15-25 degree washes described dielectric layer, then the described dielectric layer of flushing in deionized water;
B: photographic fixing post bake: described dielectric layer was immersed in the F5 stop bath post bake 1-5 minute, again with the water flushing of temperature 15-25 degree;
C: develop for the first time: described dielectric layer immerses that concentration is 50%, Celsius temperature is in the isopropyl alcohol of 23-27 degree, dewaters 2-5 minute;
D: second development: described dielectric layer immerses that concentration is 70%, Celsius temperature is in the isopropyl alcohol of 23-27 degree, dewaters 2-5 minute;
E: develop for the third time: it is that 90-100%, Celsius temperature are in the isopropyl alcohol of 23-27 degree that described dielectric layer immerses concentration, dewaters 2-5 minute.
5, the manufacture craft of holographic narrow-band band-elimination optical filter according to claim 3 is characterized in that: preparation (bichromate gelatin) liquid comprises the steps:
A: gelatin is put into deionized water soak, until the complete imbibition of gelatin;
B: whisking gelatin under the condition of Celsius temperature 70-80 degree forms gelatin solution until dissolving fully;
C: in the gelatin solution of Celsius temperature 49-51 degree, add ammonium dichromate solution, make (bichromate gelatin) sensitization liquid;
D: the filtrator with 0.2 micron pore size filters described sensitization liquid, and eliminates the bubble in the described sensitization liquid;
6, the manufacture craft of holographic narrow-band band-elimination optical filter according to claim 5 is characterized in that: the concentration of described gelatin solution is to contain 5-6 gram gelatin in per 100 ml deionized water; Add the 14-17 ml concn in described per 100 milliliters of gelatin solutions and be 5% dichromic acid by solution.
7, the manufacture craft of holographic narrow-band band-elimination optical filter according to claim 3, it is characterized in that: described sensitization liquid is being coated in described glass substrate [2] operation, glass substrate [2] heated to Celsius temperature 65-75 degree, be positioned on the levelling bench, again described sensitization liquid is poured on the glass substrate [2], smoothens, natural levelling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN99116873A CN1096617C (en) | 1999-09-13 | 1999-09-13 | Holographic narrow-band band-elimination optical filter and its manufacture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99116873A CN1096617C (en) | 1999-09-13 | 1999-09-13 | Holographic narrow-band band-elimination optical filter and its manufacture |
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| Publication Number | Publication Date |
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| CN1252529A true CN1252529A (en) | 2000-05-10 |
| CN1096617C CN1096617C (en) | 2002-12-18 |
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| CN (1) | CN1096617C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124045A (en) * | 2013-01-18 | 2013-05-29 | 西安卓铭光电科技有限公司 | Semiconductor laser and narrow-band high-reflectivity film |
| CN103217274A (en) * | 2013-04-16 | 2013-07-24 | 北极光电(深圳)有限公司 | Method for detection and judgment of optical characteristic qualified region of deformed thin film filter |
| CN103327226A (en) * | 2013-06-17 | 2013-09-25 | 南昌欧菲光电技术有限公司 | Optical filter, manufacturing method thereof and mobile phone camera shooting module set comprising optical filter |
| CN106024837A (en) * | 2016-06-08 | 2016-10-12 | 京东方科技集团股份有限公司 | Display substrate and display apparatus |
| CN107329200A (en) * | 2017-09-01 | 2017-11-07 | 佛山科学技术学院 | A kind of holographic anti-blue light film and preparation method thereof |
| CN109959995A (en) * | 2017-12-14 | 2019-07-02 | 惠州海格光学技术有限公司 | Novel filter cradle fits process |
| CN110337583A (en) * | 2017-05-02 | 2019-10-15 | 林平 | A kind of sample bearing device for infrared spectrometry |
| CN114675362A (en) * | 2022-04-01 | 2022-06-28 | 深圳市锐欧光学股份有限公司 | Surface protection coating method for optical glass |
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1999
- 1999-09-13 CN CN99116873A patent/CN1096617C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124045A (en) * | 2013-01-18 | 2013-05-29 | 西安卓铭光电科技有限公司 | Semiconductor laser and narrow-band high-reflectivity film |
| CN103217274A (en) * | 2013-04-16 | 2013-07-24 | 北极光电(深圳)有限公司 | Method for detection and judgment of optical characteristic qualified region of deformed thin film filter |
| CN103327226A (en) * | 2013-06-17 | 2013-09-25 | 南昌欧菲光电技术有限公司 | Optical filter, manufacturing method thereof and mobile phone camera shooting module set comprising optical filter |
| CN106024837A (en) * | 2016-06-08 | 2016-10-12 | 京东方科技集团股份有限公司 | Display substrate and display apparatus |
| CN106024837B (en) * | 2016-06-08 | 2019-08-02 | 京东方科技集团股份有限公司 | Display base plate and display device |
| CN110337583A (en) * | 2017-05-02 | 2019-10-15 | 林平 | A kind of sample bearing device for infrared spectrometry |
| CN107329200A (en) * | 2017-09-01 | 2017-11-07 | 佛山科学技术学院 | A kind of holographic anti-blue light film and preparation method thereof |
| CN109959995A (en) * | 2017-12-14 | 2019-07-02 | 惠州海格光学技术有限公司 | Novel filter cradle fits process |
| CN114675362A (en) * | 2022-04-01 | 2022-06-28 | 深圳市锐欧光学股份有限公司 | Surface protection coating method for optical glass |
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| Publication number | Publication date |
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| CN1096617C (en) | 2002-12-18 |
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