CN203606528U - Cubic prism bandpass filter without polarization - Google Patents
Cubic prism bandpass filter without polarization Download PDFInfo
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- CN203606528U CN203606528U CN201320751989.0U CN201320751989U CN203606528U CN 203606528 U CN203606528 U CN 203606528U CN 201320751989 U CN201320751989 U CN 201320751989U CN 203606528 U CN203606528 U CN 203606528U
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- catoptron
- bandpass filter
- refractive index
- polarization
- wall
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Abstract
The utility model discloses a cubic prism bandpass filter without polarization. The cubic prism bandpass filter is positioned between inclined surfaces of two isosceles right prisms forming a cubic prism, and comprises a first reflecting mirror, a first spacing layer, a second reflecting mirror, a second spacing layer, a third reflecting mirror, a third spacing layer, a fourth reflecting mirror, a fourth spacing layer, a fifth reflecting mirror, a fifth spacing layer and a sixth reflecting mirror which are sequentially arranged in order. The basic periodic structure of the first reflecting mirror is M2LM2H2; the basic periodic structures of the second and fourth reflecting mirrors are H1M1LM1; the basic periodic structures of the third and fifth reflecting mirrors are M1LM1H1; the basic periodic structure of the sixth reflecting mirror is H2M2LM2; H1 represents a first high refractive index film; H2 represents a second high refractive index film; M1 represents a first middle refractive index film; M2 represents a second middle refractive index film; L represents a low refractive index film; and the first spacing layer, the second spacing layer, the third spacing layer, the fourth spacing layer and the fifth spacing layer are low refractive index films. The cubic prism bandpass filter without polarization can be widely used in the fields of projection display and optical communication.
Description
Technical field
The utility model relates to a kind of block prism bandpass filter without polarization, belongs to optical field, can be widely used in optics, photoelectricity, laser device and technology, especially for the field such as Projection Display and optical communication.
Background technology
Existing bandpass filter is all alternately made up of high index of refraction (H) and two kinds of films of low-refraction (L), and its structure is: { [catoptron-wall-catoptron] L}
j, as { [(HL)
ih xL H (LH)
i] L}
j, in formula (HL)
ih, H (LH)
ibe catoptron, xL represents that order of interference is the low refractive index film wall of x, and i is the basic cycle number of catoptron, and j is the periodicity of bandpass filter, and last L is coupling layer or the antireflection layer of bandpass filter.Because the bandwidth of catoptron and reflectivity are to be determined by the ratio of the optical admittance of this bi-material, therefore the characteristic of bandpass filter mainly also depends on the ratio of the optical admittance of bi-material.But this changes than the incident angle with light not only, and can produce very large difference to s, two polarized components of p.From Film Optics, η
s=n cos θ, η
p=n/cos θ, θ is the refraction angle of light in rete, and the available law of sines is associated with incident angle, so,
η
Hs/η
Ls=cosθ
H/cosθ
L
η
Hp/η
Lp=cosθ
L/cosθ
H
For s, two kinds of polarized components of p, the ratio of the optical admittance of high and low refractive index bi-material can further be write as:
(η
H/η
L)
s/(η
H/η
L)
p=(cosθ
H)
2/(cosθ
L)
2
Due to (cos θ
h)
2/ (cos θ
l)
2always be greater than 1, and incident angle is larger, this ratio is larger.The reflection bandwidth of this explanation s polarization is always roomy than the zone of reflections of p polarization, and the reflectivity of s polarization is always high than the reflectivity of p polarization.This is a kind of intrinsic characteristic in the catoptron being alternately made up of high index of refraction and two kinds of films of low-refraction.
Because the bandpass filter of prior art is often required in directional light and the situation of vertical incidence, so there is no the problems referred to above, but along with the progress of technology, constantly occur bandpass filter among the flat board and block prism of 45 ° of incidents, particularly to block prism, because the incident angle on glass-rete interface is 45 °, the polarization effect of its 45 ° of incident angle on air-rete interface during than flat board can be many greatly, so fail so far to manufacture and design.For this problem is described, table 1 has calculated the refraction angle θ in two kinds of retes of high and low refractive index when incident angle is 45 °
h, θ
l, for convenience of comparing, in calculating, the refractive index of high refractive index layer all gets 2.43, and the refractive index of low-index film all gets 1.38.Can find out, in block prism, the refraction angle at glass-rete interface is far longer than the refraction angle at air-rete interface in flat board, and glass refraction is higher, and refraction angle is larger.And refraction angle is larger, represent (cos θ
h)
2/ (cos θ
l)
2ratio is larger, and polarization effect is more serious, and at this moment s, p polarization separation are larger.The basic reason place that Here it is applies there are no block prism bandpass filter so far.
Table 1
Same the in the situation that of 45 ° of incident angles, although plate bandpass filter polarization effect is less, but it can introduce larger imaging aberration, therefore must use block prism in some occasion, but the polarization effect of block prism cannot solve again, for this reason, designer have to first convert polarized light to natural light by a polarization conversion synthesis system, and then incides on the bandpass filter of block prism.For example, in projection display system, conventionally first natural light is decomposed into s, p polarized light, then p polarized light is converted to s polarized light, the last linearly polarized light that synthesizes again full s polarization with the s polarized light of another bundle unconverted, while using block prism like this, bandpass filter just can not produce s, p polarization separation certainly again.Problem is to do so not only because using polarization conversion synthesis system that cost is significantly improved, and causes beam quality variation, a large amount of optical energy loss.In Projection Display, after polarization conversion synthesis system, optical energy loss can be in 25% left and right.
Utility model content
The purpose of this utility model is the defect that overcomes above-mentioned prior art, in the situation that there is no polarization conversion synthesis system, provides a kind of block prism bandpass filter without polarization.
For achieving the above object, the utility model produces the basis of abnormal polarization separation reason in the time analyzing existing bandpass filter for block prism, a kind of new design is proposed, to reduce s, the p polarization separation in two transmission-reflection transition districts of block prism bandpass filter.In general, there are two problems in existing bandpass filter: first while being used for block prism, the catoptron of existing bandpass filter is two kinds of film materials of high and low refractive index for a Bian, cannot meet the optical admittance coupling in broadband to s, two polarized components of p simultaneously; Next is that existing bandpass filter is often used to directional light and vertical incidence, does not need to consider the transmission phasic difference of s, two polarized components of p while therefore design.For this reason, the utility model proposes new main design: adopt three kinds of materials to form the catoptron of block prism bandpass filter, and the order that the material that each catoptron is selected and material are arranged can be different, to meet the optical admittance coupling of broadband transmission band, make the optical admittance of the passband of whole optical filter s, two polarized components of p all equal the optical admittance of incident medium (glass) and outgoing medium (being also glass), its fundamental purpose is to improve the passband transmissivity of s, p polarized light simultaneously; The mirror structure that adopts different refractivity material to arrange forms Embedded multiple bandpass filter, to reduce the polarization transmission phasic difference of s, p on broadband passband, its fundamental purpose is that the s that makes various materials corresponding, the ratio of p optical admittance equal or close to 1, reduce s, the polarization separation of p polarized light in passband.
Specifically, technical solution adopted in the utility model is:
Without a block prism bandpass filter for polarization, it is arranged between the inclined-plane of two isosceles right-angle prisms that form block prism, and this bandpass filter is by the first catoptron R
1, the first wall S
1, the second catoptron R
2, the second wall S
2, the 3rd catoptron R
3, the 3rd wall S
3, the 4th catoptron R
4, the 4th wall S
4, the 5th catoptron R
5, the 5th wall S
5, the 6th catoptron R
6be arranged in order in order composition, wherein, the first catoptron R
1the structure of basic cycle be (M
2lM
2h
2), the second catoptron R
2with the 4th catoptron R
4the structure of basic cycle be (H
1m
1lM
1), the 3rd catoptron R
3with the 5th catoptron R
5the structure of basic cycle be (M
1lM
1h
1), the 6th catoptron R
6the structure of basic cycle be (H
2m
2lM
2), H
1represent the first high refractive index film, H
2represent the second high refractive index film, M
1represent the first middle refractive index film, M
2represent the second middle refractive index film, L represents low refractive index film; The first catoptron R
1, the second catoptron R
2, the 3rd catoptron R
3, the 4th catoptron R
4, the 5th catoptron R
5with the 6th catoptron R
6basic cycle number be to be more than or equal to 1 positive integer; The first wall S
1, the second wall S
2, the 3rd wall S
3, the 4th wall S
4, the 5th wall S
5for low refractive index film L; The periodicity of described bandpass filter is to be more than or equal to 1 positive integer.
Preferably, the first catoptron R described in the utility model
1, the second catoptron R
2, the 3rd catoptron R
3, the 4th catoptron R
4, the 5th catoptron R
5with the 6th catoptron R
6basic cycle number be respectively 1～6.
Preferably, the periodicity of bandpass filter described in the utility model is 1～3.
Utilize above-mentioned design proposal of the present utility model, in the situation that not using polarization conversion synthesis system, just can provide a kind of block prism bandpass filter without polarization.
Compared with prior art, the beneficial effects of the utility model are:
Used bandpass filter can not be used for the situation of light oblique incidence, when light is when in air, in (corresponding to flat board) or glass, (corresponding to block prism) oblique incidence (modal is 45 ° of incidents) is to bandpass filter, because very big-difference certainly will occur in itself in the optical admittance of s polarized light and p polarized light, thereby the transmission that causes bandpass filter divides light curve to produce very large s, p polarization separation and lose the function of bandpass filter, particularly in block prism bandpass filter, the p polarized light transmission band of optical filter can become non-constant width, and s polarized light transmission band can become very narrow, this is impossible actually to use in the system such as Projection Display and optical communication.
The utility model has directly designed the bandpass filter of block prism, understands after this design concept, and the dull and stereotyped bandpass filter when oblique incidence of design light is just easy.The utility model adopts three kinds of materials of high, medium and low refractive index to form the catoptron of block prism bandpass filter, and the order that the material that each catoptron is selected and material are arranged can be different, meeting the optical admittance coupling of optical filter s, p polarized light on whole broadband transmission band, improve the passband transmissivity of s, p polarized light; The mirror structure that simultaneously adopts different refractivity material to arrange forms Embedded multiple bandpass filter, to reduce s, the phasic difference of p polarization transmission of broadband transmission band, has reduced s, the polarization separation of p polarized light in passband.These important breakthrough not only make refractive index that block prism bandpass filter goes for prism from 1.52 until 1.75, and can obtain excellent filter performance: s, the p polarized light average transmittance of optical filter transmission band all can reach 99% left and right, this is mainly owing to the coupling of optical admittance; In bandpass filter shortwave transmission-reflection transition district and long wave transmission-reflection transition district, transmissivity is that the s at 50% place, the wavelength separated of p polarized light all can be less than 2nm, and optimum reaches 0.2nm, and this is reducing owing to s, the phasic difference of p polarized light transmission mainly.This has brought subversive progress for design optics, photoelectricity, laser system and instrument, particularly in the field such as Projection Display and optical communication not only cost-saved, reduce volume and weight, and can significantly improve optical property.
Prior art is not also recognized the method for direct design block prism bandpass filter, but adopts the method such as polarization conversion synthesis system to avoid this difficult problem; Prior art is also never recognized the catoptron that adopts three kinds of materials to form bandpass filter, can realize the s in bandpass filter broadband, the optical admittance coupling of p polarized light, increases the transmissivity of optical filter transmission band; Prior art more never recognizes that the mirror structure that adopts different refractivity material to arrange forms Embedded multiple bandpass filter and can reduce the polarization transmission phasic difference in broadband transmission band, eliminates or reduces s, the polarization separation of p polarized light in passband.
Accompanying drawing explanation
Fig. 1 is the principle of work schematic diagram of the utility model block prism bandpass filter.
Fig. 2 is that s, p polarization and the average transmission of existing bandpass filter divides light curve.
Fig. 3 is s, the p polarization phasic difference curve of existing bandpass filter.
Fig. 4 is the basic cycle structural representation of bandpass filter of the present utility model.
Fig. 5 is the thickness of every tunic and the corresponding relation figure of refractive index of bandpass filter of the present utility model.
Fig. 6 is that s, p polarization and the average transmission of the bandpass filter shown in Fig. 5 divides light curve.
Fig. 7 is s, the p polarization phasic difference curve of the bandpass filter shown in Fig. 5.
Fig. 8 is that s, p polarization and the average transmission that the bandpass filter shown in Fig. 6 reduces after transmission band half-breadth divides light curve.
Fig. 9 is that s, p polarization and the average transmission after the bandpass filter broadening transmission band half-breadth shown in Fig. 6 divides light curve.
Figure 10 is that s, p polarization and the average transmission of the utility model bandpass filter in the time of Refractive Index of Glass Prism 1.75 divides light curve.
Embodiment
Fig. 1 is the principle of work schematic diagram of the utility model block prism bandpass filter.Bandpass filter 2 is sandwiched in and forms between the isosceles right-angle prism 1 of block prism and the inclined-plane of isosceles right-angle prism 3; As preferred implementation, the refractive index of isosceles right-angle prism can be selected arbitrarily as required between 1.52～1.75, and considers cost and glass quality, and it is 1.52 K that thumping majority situation is selected refractive index
9glass.Incident light incident on the air-glass surface of one of them right angle face of isosceles right-angle prism 1, incident angle is 0 °, enter after glass, incident angle on glass-rete interface is 45 °, after bandpass filter, transmitted spectrum is by one of them right angle face outgoing of isosceles right-angle prism 3, after reflectance spectrum is reflected by bandpass filter, by another right angle face outgoing of isosceles right-angle prism 1.
Fig. 2 is that s, p polarization and the average transmission of existing bandpass filter divides light curve.This bandpass filter is alternately made up of high index of refraction (H) and two kinds of films of low-refraction (L), and its structure is: { [(HL)
2h2LH (LH)
2] L}
4, the refractive index of H, L is respectively 2.43 and 1.38, totally 48 tunics.In the time of vertical incidence, slightly can obtain good optical property through thickness optimization: transmission band half-breadth 10nm, average transmittance 99%.It's a pity, after this optical filter is plated on block prism inclined-plane, due to s, p polarization separation, performance obviously worsens, although H, the thickness of the each tunic of L has re-started repeatedly to be optimized, but result still as shown in Figure 2: p polarized light half-breadth is increased to 39nm from 10nm, and s polarized light half-breadth is reduced to 1.5nm from 10nm, due to average transmittance Tav=(Ts+Tp)/2, therefore make average transmittance curve produce very large step, lost the function of bandpass filter.Analyze the reason that it significantly worsens at block prism performance, mainly contain: the one, existing bandpass filter is two kinds of film materials of high and low refractive index for a Bian, cannot meet the optical admittance coupling in broadband to s, two polarized components of p simultaneously; The 2nd, existing bandpass filter, because be often used to directional light and vertical incidence, is not considered the transmission phasic difference of s, two polarized components of p while therefore design.Fig. 3 is s, the p polarization transmission phasic difference curve of now using bandpass filter shown in Fig. 2, can find out, s, the phasic difference of p polarization transmission not only produce very great fluctuation process in passband district, and its mean value can reach 180 ° of left and right, cause s, the transmissivity of two polarized components of p in passband to produce abnormal polarization separation.
For overcoming the problems referred to above, the utility model proposes the catoptron that adopts three kinds of materials of high, medium and low refractive index to form block prism bandpass filter, and the order that the material that each catoptron is selected and material are arranged can be different, to meet the optical admittance coupling of broadband transmission band, make the optical admittance of whole bandpass filter s, p polarized light equal the optical admittance of incident medium (glass) and outgoing medium (being also glass), improve the passband transmissivity of s, p polarized light; The mirror structure that adopts different refractivity material to arrange forms Embedded multiple bandpass filter, to reduce s, the phasic difference of p polarization transmission of broadband transmission band, make the s that various materials are corresponding, the ratio of p optical admittance equal or close to 1, reduce s, the polarization separation of p polarized light in passband.Fig. 4 is the basic cycle structural representation of bandpass filter of the present utility model, and as shown in Figure 4, all catoptrons are (from R
1to R
6) all formed wherein catoptron R by three kinds of materials
1and R
6by H
2, M
2with tri-kinds of material compositions of L, catoptron R
2, R
3, R
4and R
5by H
1, M
1with tri-kinds of material compositions of L; And the basic cycle of catoptron has the structure that different refractivity material is arranged, wherein catoptron R
1basic cycle be (M
2lM
2h
2), catoptron R
2and R
4basic cycle be (H
1m
1lM
1), catoptron R
3and R
5basic cycle be (M
1lM
1h
1), catoptron R
6basic cycle be (H
2m
2lM
2).Utilize above-mentioned mirror structure to form Embedded multiple bandpass filter, wherein all walls are low refractive index film L, have so just formed the basic cycle structure of the bandpass filter of the present utility model shown in Fig. 4: the first catoptron R
1the-the first wall S
1the-the second catoptron R
2the-the second wall S
2-tri-catoptron R
3-tri-wall S
3-tetra-catoptron R
4-tetra-wall S
4-five catoptron R
5-five wall S
5-six catoptron R
6, i.e. (M
2lM
2h
2) x
1l (H
1m
1lM
1) x
2l (M
1lM
1h
1) x
3l (H
1m
1lM
1) x
4l (M
1lM
1h
1) x
5l (H
2m
2lM
2), wherein x
1, x
2, x
3, x
4and x
5be respectively the first wall S accordingly
1, the second wall S
2, the 3rd wall S
3, the 4th wall S
4with the 5th wall S
5order of interference.X
1, x
2, x
3, x
4and x
5span be 2～6, x
1, x
2, x
3, x
4and x
5can be the same or different.Because those skilled in the art often call single chamber bandpass filter " catoptron-wall-catoptron " structure, therefore can be the 3rd catoptron R in above-mentioned basic cycle structure
3-tri-wall S
3-tetra-catoptron R
4regard first single chamber bandpass filter of embedding as: (M
1lM
1h
1) x
3l (H
1m
1lM
1), according to Film Optics, in bandpass filter centre wavelength, due to x
3l is the thickness of half-wave multiple, all cancellations of single chamber bandpass filter of this first embedding, and remaining structure is: (M
2lM
2h
2) x
1l (H
1m
1lM
1) x
2lx
4l (M
1lM
1h
1) x
5l (H
2m
2lM
2), so the second catoptron R
2the-the second wall S
2with the 4th wall S
4-five catoptron R
5second the single chamber bandpass filter embedding: (H
1m
1lM
1) (x
2+ x
4) L (M
1lM
1h
1), same, in bandpass filter centre wavelength, single chamber bandpass filter all cancellations again of this second embedding, finally the first remaining catoptron R
1the-the first wall S
1with the 5th wall S
5-six catoptron R
6outmost the 3rd single chamber bandpass filter: (M
2lM
2h
2) (x
1+ x
5) L (H
2m
2lM
2).Above-mentioned this triple single chambeies bandpass filter is embedded in and comes together to form bandpass filter of the present utility model, because the mirror structure in each chamber is different, and time also difference to some extent of interval level, makes the s of optical filter broadband transmission band, the phasic difference of p polarization transmission fully be regulated and suppress.Above-mentioned basic cycle structure can further expand, and to obtain the bandpass filter without polarization of different qualities requirement, is write as general formula and is:
wherein i
1, i
2, i
3, i
4, i
5and i
6respectively the first catoptron R
1, the second catoptron R
2, the 3rd catoptron R
3, the 4th catoptron R
4, the 5th catoptron R
5with the 6th catoptron R
6basic cycle number, the value of the basic cycle number of each catoptron is preferably respectively 1～6; J is the periodicity of bandpass filter, and the periodicity j of bandpass filter is more than or equal to 1 positive integer, and j is preferably 1～3.
According to above-mentioned design concept, the K that refractive index is 1.52
9(M on glass prism
2lM
2h
2)
22L (H
1m
1lM
1)
32L (M
1lM
1h
1)
42L (H
1m
1lM
1)
42L (M
1lM
1h
1)
32L (H
2m
2lM
2)
2film structure, slightly through thickness optimization, obtains the thickness of every tunic and the corresponding relation of refractive index of a kind of bandpass filter of the present utility model shown in Fig. 5 with the commercial film design software of TFCal.In the structure shown in Fig. 5,5 kinds of materials for bandpass filter Bian: the first high refractive index film H
1refractive index be 2.43, the second high refractive index film H
2refractive index be 2.31, the first middle refractive index film M
1refractive index be 1.593, the second middle refractive index film M
2refractive index be 1.537, the refractive index of low refractive index film L is 1.38, totally 77 layers of total rete numbers.The thickness of each rete is followed successively by 130.82, 176.86, 107.93, 71.58, 82.19, 336.26, 98.31, 30.94, 344.44, 64.47, 118.27, 165.61, 127.46, 66.07, 116.81, 167.45, 126.98, 65.89, 122.07, 229.24, 59.18, 331.9, 122.3, 169.75, 108.05, 69.03, 127.96, 165.21, 121.57, 65.63, 123.56, 165.04, 122.38, 65.59, 124.96, 165.79, 124.34, 60.9, 327.81, 59.24, 126.66, 164.58, 125.9, 65.47, 121.63, 165.03, 123.58, 65.43, 120.96, 165.19, 124.09, 65.85, 119.34, 165.18, 122.28, 401.25, 51.74, 181.16, 122.79, 65.77, 113.74, 169.64, 123.72, 65.4, 107.46, 166.56, 124.72, 69.52, 325.77, 98.14, 143.48, 162.55, 82.69, 53.13, 162.75, 134.95, 140.46, unit is nm.Fig. 6 is that s, p polarization and the average transmission of the bandpass filter shown in Fig. 5 divides light curve, in transmission-reflection transition district, transmissivity is 50% place, average transmitted light half-breadth is 34nm, p polarized light half-breadth is 35.8nm, s polarized light half-breadth is 32.8nm, s, p polarization separation that its medium short wave transmission-reflection transition district transmissivity is 50% place are 1.3nm, long wave transmission-reflection transition district transmissivity is that s, the p polarization separation at 50% place is 1.7nm, and the average transmittance of passband wavelength zone 556nm～584nm is 98.6%.Fig. 7 is s, the p polarization transmission phasic difference curve of the bandpass filter shown in Fig. 5, can find out, s, the phasic difference of p polarization transmission are not only fluctuateed very little in passband district, and its value is also very little, its medium short wave 556nm place is 43 °, long wave 583nm place is-45 °, and the s of whole passband, p polarization transmission phasic difference absolute value are all less than 45 °.It should be noted that at the wavelength 569nm s of place, p polarization transmission phasic difference curve and jump to 360 ° from 0 °, its meaning is the region that is less than 569nm at passband medium wavelength, phasic difference be on the occasion of, p polarization position is greater than s polarization position phase mutually; And be greater than the region of 569nm at passband medium wavelength, and phasic difference is negative value, p polarization position is less than s polarization position phase mutually.Because s, the p polarization transmission phasic difference absolute value of passband are all less than 45 °, therefore it is very little to make s, p polarization optical transmission divide light curve to separate.
The average transmitted light curve of the bandpass filter shown in Fig. 6 shows, structure shown in Fig. 5 can obtain the bandpass filter of half-breadth 34nm, but in some applications, require the half-breadth of transmission band less, and in other application, require the half-breadth of transmission band larger, for this reason, can count i by the basic cycle that regulates each catoptron
1, i
2, i
3, i
4, i
5and i
6, the periodicity j of bandpass filter and the order of interference x of each wall
1, x
2, x
3, x
4and x
5realize.If the K shown in Fig. 5
9film structure on glass prism suitably increases the basic cycle number of catoptron, as (M
2lM
2h
2)
22L (H
1m
1lM
1)
42L (M
1lM
1h
1)
52L (H
1m
1lM
1)
52L (M
1lM
1h
1)
42L (H
2m
2lM
2)
2, then slightly make thickness optimization with the commercial film design software of TFCal equally, in the time using identical material, at this moment total rete number is increased to 93 layers.Shown in Fig. 8, be that s, p polarization and the average transmission that this bandpass filter reduces after transmission band half-breadth divides light curve.As can be seen from Figure 8, in transmission-reflection transition district, transmissivity is 50% place, average transmitted light half-breadth is reduced to 23nm, p polarized light half-breadth is 25.2nm, s polarized light half-breadth is 22.4nm, s, p polarization separation that its medium short wave transmission-reflection transition district transmissivity is 50% place are 1.3nm, and long wave transmission-reflection transition district transmissivity is that s, the p polarization separation at 50% place is 1.5nm, and the average transmittance of passband wavelength zone 560nm～579nm is 99.3%.If also will further reduce half-breadth, the level time that also can continue to increase the basic cycle number of catoptron and improve wall.On the contrary, if the K shown in Fig. 5
9film structure on glass prism suitably reduces the basic cycle number of catoptron: { [(M
2lM
2h
2) 2L (H
1m
1lM
1)
22L (M
1lM
1h
1)
32L (H
1m
1lM
1)
32L (M
1lM
1h
1)
22L (H
2m
2lM
2)] L}
2the half-breadth of bandpass filter can broadening, at this moment, owing to having reduced the basic cycle number of catoptron, the cut-off degree of echo area declines, so need to increase the periodicity j (=2) of bandpass filter, then makes thickness optimization with the commercial film design software of TFCal equally, in the time using identical material, total rete number becomes 100 layers.Shown in Fig. 9, be that s after this bandpass filter broadening transmission band half-breadth, p polarization and average transmission divide light curve.As can be seen from Figure 9, in transmission-reflection transition district, transmissivity is 50% place, average transmitted light half-breadth is increased to 53nm, p polarized light half-breadth is 53nm, s polarized light half-breadth is 52.4nm, s, p polarization separation that its medium short wave transmission-reflection transition district transmissivity is 50% place are 0.3nm, and long wave transmission-reflection transition district transmissivity is that s, the p polarization separation at 50% place is also 0.3nm, and the average transmittance of passband wavelength zone 546nm～594nm is 99.4%.
Above examples of implementation are all that refractive index is 1.52 K
9glass prism design, in fact, according to principle of the present utility model, the same glass prism applicable to high index of refraction.As an example, be on 1.75 glass prism if the film system on the glass prism of the refractive index 1.52 shown in Fig. 8 is plated to refractive index, that is: (M
2lM
2h
2)
22L (H
1m
1lM
1)
42L (M
1lM
1h
1)
52L (H
1m
1lM
1)
52L (M
1lM
1h
1)
42L (H
2m
2lM
2)
2, make thickness optimization with the commercial film design software of TFCal equally, in the time using identical material, film is that total number of plies only needs 69 layers, just can obtain good performance.Figure 10 is that the utility model Refractive Index of Glass Prism is s, p polarization and the average transmission minute light curve of 1.75 o'clock bandpass filters.As can be seen from Figure 10, in transmission-reflection transition district, transmissivity is 50% place, average transmitted light half-breadth is 18.3nm, p polarized light half-breadth is 18.5nm, s polarized light half-breadth is 18.1nm, s, p polarization separation that its medium short wave transmission-reflection transition district transmissivity is 50% place are 0.2nm, and long wave transmission-reflection transition district transmissivity is that s, the p polarization separation at 50% place is also 0.2nm, and the average transmittance of passband wavelength zone 561nm～577nm is 98.8%.Obviously, the s of this bandpass filter passband, p polarization separation are very little.
When light has obtained very low s, the phasic difference of p polarization transmission and very little s, p polarization separation of the present utility model during with 45° angle oblique incidence on without glass-optical filter interface of polarization block prism bandpass filter equally, thereby not only can be used for the field such as Projection Display and optical communication, and can be widely used in various optics, photoelectricity, laser device and technology.
Claims (3)
1. the block prism bandpass filter without polarization, it is characterized in that: described bandpass filter is between the inclined-plane of two isosceles right-angle prisms of composition block prism, described bandpass filter is arranged in order and forms in order by the first catoptron, the first wall, the second catoptron, the second wall, the 3rd catoptron, the 3rd wall, the 4th catoptron, the 4th wall, the 5th catoptron, the 5th wall, the 6th catoptron, wherein, the basic cycle structure of the first catoptron is M
2lM
2h
2, the basic cycle structure of the second catoptron and the 4th catoptron is H
1m
1lM
1, the basic cycle structure of the 3rd catoptron and the 5th catoptron is M
1lM
1h
1, the basic cycle structure of the 6th catoptron is H
2m
2lM
2, wherein, H
1represent the first high refractive index film, H
2represent the second high refractive index film, M
1represent the first middle refractive index film, M
2represent the second middle refractive index film, L represents low refractive index film; The basic cycle number of described the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron, the 5th catoptron and the 6th catoptron is respectively the positive integer that is more than or equal to 1; The first wall, the second wall, the 3rd wall, the 4th wall, the 5th wall are low refractive index film; The periodicity of described bandpass filter is to be more than or equal to 1 positive integer.
2. the block prism bandpass filter without polarization according to claim 1, is characterized in that: the periodicity of described bandpass filter is 1～3.
3. the block prism bandpass filter without polarization according to claim 1, is characterized in that: the basic cycle number of described the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron, the 5th catoptron and the 6th catoptron is respectively 1～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320751989.0U CN203606528U (en) | 2013-11-25 | 2013-11-25 | Cubic prism bandpass filter without polarization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320751989.0U CN203606528U (en) | 2013-11-25 | 2013-11-25 | Cubic prism bandpass filter without polarization |
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| Publication Number | Publication Date |
|---|---|
| CN203606528U true CN203606528U (en) | 2014-05-21 |
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ID=50719193
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576229A (en) * | 2013-11-25 | 2014-02-12 | 杭州科汀光学技术有限公司 | Cubic prism bandpass filter without polarization |
| CN110989064A (en) * | 2019-11-21 | 2020-04-10 | 天津津航技术物理研究所 | Method for regulating and controlling bandwidth of narrow-band filtering film |
-
2013
- 2013-11-25 CN CN201320751989.0U patent/CN203606528U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576229A (en) * | 2013-11-25 | 2014-02-12 | 杭州科汀光学技术有限公司 | Cubic prism bandpass filter without polarization |
| CN110989064A (en) * | 2019-11-21 | 2020-04-10 | 天津津航技术物理研究所 | Method for regulating and controlling bandwidth of narrow-band filtering film |
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