CN203786406U - RGB three-color beam combiner - Google Patents
RGB three-color beam combiner Download PDFInfo
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- CN203786406U CN203786406U CN201320730920.XU CN201320730920U CN203786406U CN 203786406 U CN203786406 U CN 203786406U CN 201320730920 U CN201320730920 U CN 201320730920U CN 203786406 U CN203786406 U CN 203786406U
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- body phase
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Abstract
The utility model relates to an RGB three-color beam combiner. The beam combiner comprises two identical isosceles right-angled lenses, a transmission-body phase holographic grating G1 taking dichromate gelatin as a holographic recording medium, and a reflection-body phase holographic grating G2 taking dichromate gelatin as a holographic recording medium. The peak stripe surface of the transmission-body phase holographic grating G1 is perpendicular to the grating surface, and the peak stripe surface of the reflection-body phase holographic grating G2 is parallel to the grating surface. The bottom surfaces of the two isosceles right-angled lenses are disposed oppositely. The transmission-body phase holographic grating G1 and the reflection-body phase holographic grating G2 are disposed between the two bottom surfaces, and epoxy resin is used for binding and packaging. The beam combiner provided by the utility model is high in diffraction efficiency, is high in signal to noise ratio, is low in scattering, is low in absorption, is low in energy consumption of a light beam during beam combining, and can effectively improve the utilization rate of optical energy.
Description
Technical field
The utility model relates to a kind of RGB tri-coloured light bundling devices and preparation method thereof, belongs to information optics technical field.
Background technology
Body phase holographic grating (VPHG) has that diffraction efficiency is high, wavelength selectivity and the feature such as angular selectivity is strong, signal to noise ratio (S/N ratio) is high, scattering is low, it is low to absorb and cost of manufacture is cheap, in technical fields such as high resolution spectrometer device, wavelength-division multiplex and pulse compressions, has widespread use.
This century from the beginning of, along with the enhancement day by day to superlaser demand, developed to the theory of laser bundling device and experimental study.1999, Massachusetts Institute Technology's Lincoln laboratory has been invented a set of synthesizer, with plane grating, control the light beam that each device sends different wave length simultaneously, make each light beam near field and far field, realize stack (referring to document: Cook C C and Fan T Y Spectral beam combining of Yb-doped fiber lasers in an external cavity.OSA TOPS, Advanced solid lasers, 1 999,26:163-166.).2003, the people such as Igor V and Ciapurin were studied transmission-type body grating spectral beam combining scheme parameter optimization, and Gaussian beam has been carried out to analogue simulation, and to the diffraction characteristic of reflection-type body grating carried out analyzing (referring to document:
ciapurin I V Glebov L B, Smimov V I.Spectral combing of high-power fiber laser beams using Bragg grating in PTR glass.Proc.of SPIE, 2004,5335:116-124.
ciapurin I V, G1ebov L B.Modeling of Gaussian beam diffraction on vo1ume Bragg gratings in PTR glass [C], Proc. SPIE, 2005,5742:183-194.).2008, the people such as Andrusyak utilize four reflective Volume Bragg gratings (VBG) to realize the Spectral beam combining of Liao Wu road high power light pricker laser instrument (referring to document: Andrusyak O, Ciapurin I, Simirnov V, et al External and Common cavity high spectral Density Beam Combing of high Power Fiber Lasers[c] Proc.SPIE, 2008,6873:687314.).
In recent years, the domestic bundling device research of also having carried out successively for Spectral beam combining.2008, accounting for the people such as raw treasured, Zhao Shanghong is PTR(fotoceram to recording materials) the spectral beam combining of transmitting volume Bragg grating carried out correlative study (referring to document: the research based on transmitting volume Bragg grating spectral beam combining [J]. photoelectron laser, 2008,19 (3): 318-32l.); The people such as Pu Shibing, Jiang Zongfu has set up the physical model of a set of Spectral beam combining based on VBG, numerical simulation the laser of two-way He San road Gauss's line spectrum synthetic (referring to document: the numerical analysis of the Spectral beam combining based on Volume Bragg grating [J]. light laser and the particle beams, 2008,20 (5): 721-724.).2010, the people such as Liu Li, Tan Jichun designed 90 ° of configuration Bragg grating beam optical paths and carried out the laser of two bundle different wave lengths and bundle and two bundles wavelength laser of the same race and bundle experiment (referring to document: beam synthesizing technology research based on Volume Bragg grating and realization [J]-National University of Defense technology journal 2010,32 (2) .).In prior art, bundling device is generally used for the bundle that closes between the less high energy laser beam in wavelength interval.
Summary of the invention
The deficiency that the utility model exists for prior art, provides a kind of simple in structure, and preparation cost is cheap, has beam energy loss little, the RGB tri-coloured light bundling devices that the efficiency of light energy utilization is high.
The technical scheme that realizes the utility model object is to provide a kind of RGB tri-coloured light bundling devices, the transmissive body phase holographic grating G1 that it comprises two identical isosceles right-angle prisms, the dichromated gelatin of take is holographic recording medium and reflecting body phase holographic grating G2; The peak value stripe surface of transmissive body phase holographic grating G1 is vertical with grating surface, and the peak value stripe surface of reflecting body phase holographic grating G2 is parallel with grating surface; Put in opposite directions the bottom surface of two isosceles right-angle prisms, places respectively transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2 between two bottom surfaces, by epoxy resin bonding, is encapsulated.
RGB tri-coloured light bundling devices described in technical solutions of the utility model, are placed in respectively by three λ/2 wave plates between each right angle face of laser instrument and isosceles right-angle prism.
The material of the isosceles right-angle prism that the utility model adopts is BK7 glass.In when bundle of closing that is applied to RGB tri-coloured light, their incident relation of RGB tri-coloured light is respectively: the light beam of RGB tri-coloured light with close Shu Guang an angle of 90 degrees each other, in RGB tri-coloured light, light beam passes through grating G1 and G2 with transmission form, in remaining two-beam, light beam incides G1, and after diffraction is by G1, G2 is passed through in transmission, another bundle incides G2, through diffraction, by G2, represents.
Compared with prior art, the beneficial effects of the utility model are:
1, the RGB tri-coloured light bundling device part preparations that the utility model provides are simple, and with low cost, can persistence.
2, the diffraction efficiency height of VPHG can reach 100% in theory, and signal to noise ratio (S/N ratio) is high, and scattering is low, absorb low, little for closing the beam energy loss of when bundle, can effectively improve the utilization factor of luminous energy.
If the RGB that 3, the utility model provides tri-coloured light bundling device parts increase λ/2 these bundling devices of wave plate, when being applicable to RGB tri-coloured light and being P polarized light, close bundle, at laser projection system, there is potential application foreground.
Accompanying drawing explanation
The structure of the RGB tri-coloured light bundling devices that Fig. 1 provides for the utility model embodiment 1 and use light path schematic diagram;
Fig. 2 is that in the utility model embodiment 1, ruddiness and blue light close bundle schematic diagram through transmissive body phase holographic grating G1;
Wavelength-diffraction efficiency (+1 grade) scatter chart of the transmissive body phase holographic grating G1 that Fig. 3 provides for the utility model embodiment 1;
The ruddiness that Fig. 4 provides for the utility model embodiment 1, blue light and green glow three beams combiner schematic diagram;
The diffraction efficiency curve figure of the reflecting body phase holographic grating G2 that Fig. 5 the utility model embodiment 1 provides;
The structure of the RGB tri-coloured light bundling devices that Fig. 6 provides for the utility model embodiment 2 and use light path schematic diagram;
Wavelength-diffraction efficiency (+1 grade) scatter chart of the transmissive body phase holographic grating G1 that Fig. 7 the utility model embodiment 2 provides;
Wavelength-diffraction efficiency (+1 grade) scatter chart of the reflecting body phase holographic grating G2 that Fig. 8 provides for the utility model embodiment 2;
The structure of the RGB tri-coloured light bundling devices that Fig. 9 provides for the utility model embodiment 3 and use light path schematic diagram;
Wavelength-diffraction efficiency (+1 grade) scatter chart of the transmissive body phase holographic grating G1 that Figure 10 the utility model embodiment 3 provides;
Wavelength-diffraction efficiency (+1 grade) scatter chart of the reflecting body phase holographic grating G2 that Figure 11 provides for the utility model embodiment 3.
Embodiment
Below in conjunction with drawings and Examples, technical solutions of the utility model are further elaborated.
Embodiment 1
Referring to accompanying drawing 1, it is the structure of the RGB tri-coloured light bundling devices that provide of the present embodiment and uses light path schematic diagram; In the present embodiment, RGB tri-coloured light wavelength are respectively ruddiness λ
r=635nm, green glow λ
g=532nm, blue light λ
b=473nm, carries out the design of Structural Parameters of transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2.RGB tri-coloured light bundling devices comprise by two identical isosceles right-angle prism P1 and P2, transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2.Grating G1 and the G2 non-inclination peak value stripe surface grating for obtaining with symmetrical light path record, the peak value stripe surface of grating G1 is vertical with grating surface, and the peak value stripe surface of grating G2 is parallel with grating surface.Put in opposite directions the bottom surface of two identical isosceles right-angle prisms, places respectively transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2 therebetween, with epoxy resin bonding, encapsulates.RGB tri-coloured light (be s polarized light, vibration plane is perpendicular to the plane of incidence) are normally incident in respectively on three right angle faces of two isosceles right-angle prisms with the angle of 90 ° each other.(wavelength is λ to ruddiness
r) and blue light (wavelength is λ
b) through transmissive body phase holographic grating G1, now G1 is to λ
rdiffraction efficiency maximum and to λ
bdiffraction efficiency minimum, and due to λ
rincident angle on G1 and angle of diffraction are Mirror Symmetry with respect to peak value stripe surface, and λ
bmainly with transmission form through G1, so after G1 λ
rwith λ
bexit direction consistent, enter reflecting body phase holographic grating G2 after closing bundle.The λ of G2 to this incident
rand λ
bdiffraction efficiency all minimum, and (wavelength is λ to green glow
g) diffraction efficiency maximum, and due to λ
gincident angle on G2 and angle of diffraction are also Mirror Symmetry with respect to peak value stripe surface, and λ
rand λ
bmainly with transmission form through G2, so after G2 λ
rand λ
bwith λ
gexit direction consistent.Finally, the vertical outgoing from a right angle face of isosceles right-angle prism P2 in the same direction of RGB tri-coloured light, thus realize the beam function that closes of RGB tri-coloured light.
If RGB tri-coloured light are p polarized light (being that vibration plane is parallel to the plane of incidence), can before each coloured light enters isosceles right-angle prism, first by λ/2 wave plate, be converted into s polarized light, and then close bundle.
Grating G1 and G2 all adopt dichromated gelatin (DCG, refractive index n
2=1.52) as holographic recording medium, and be non-inclination striped concave grating.According to optical wavelength of all kinds, light beam incident and exit direction, require to determine respectively the empty frequency of grating G1 and G2.Adopt Kogelnik coupled wave theory and G-solver software (theoretical based on rigorous coupled wave) respectively the refractive index modulation degree Δ n of grating G1 and G2 and the thick d of glue to be optimized and to be chosen, to reach diffraction of light efficiency of all kinds requirement.In bundling device, prism material used is that (refractive index is n to BK7 glass
1=1.5168).
The design procedure of body phase holographic grating bundling device is as follows:
1, the optimal design of the definite and diffraction efficiency of transmissive body phase grating G1 parameter
Referring to accompanying drawing 2, it closes bundle schematic diagram for ruddiness in the present embodiment and blue light pass through transmissive body phase holographic grating G1; λ
rmainly with+1 diffraction, pass through grating G1 and λ
bmainly with 0 grade of transmission by grating G1, and close bundle and incide G2.For meeting the parameter of this condition grating G1, by formula (1) and (2), draw space frequency f.Within refractive index modulation degree Δ n is controlled at 0.02～0.04 scope, by formula (3), (4) and (5) and G-solver software, draw grating medium refraction index degree of modulation Δ n
1=0.02, recording medium thickness d
1=11.4um.
(1)
(2)
=3378 lp/mm 。
Incident light meets Bragg condition and is incident to non-inclination striped concave grating and can obtains:
(3)
(4)
(5)
In formula, λ
rfor incident red light wavelength, θ
1and θ
2be respectively incident light wave and diffraction light wave in grating medium, Δ n is DCG medium refraction index degree of modulation, and d is grating thickness,
for the Polarization Dependent Loss of blue light,
off-Bragg vector for blue light.Result of calculation obtains the present embodiment transmissive body phase grating G1 parameter: f=3378 lp/mm, Δ n=0.02, d=11.4um.
Referring to accompanying drawing 3, it is wavelength-diffraction efficiency (+1 grade) distribution curve (f=3378 lp/mm, Δ n=0.02, d=11.4um) of the present embodiment transmissive body phase holographic grating G1; As seen from Figure 3, for the frequency body phase holographic grating of high-altitude, the diffraction efficiency curve being calculated by Kogelnik coupled wave theory and G-solver software (theoretical based on rigorous coupled wave) is consistent.Transmissive body phase holographic grating G1 is at λ
r=635nm place diffraction efficiency approaches 100%, and at λ
b=473nm place diffraction efficiency is close to 0, and therefore, in grating G1, Red and blue light passes through with the form of 1 order diffraction and 0 order diffraction (being transmission) respectively.And due to Red and blue light with 90 ° of angle outgoing each other the surface to grating G1, and incident angle and the angle of diffraction of ruddiness in G1 medium is Mirror Symmetry with respect to peak value stripe surface, therefore, Red and blue light is consistent in the exit direction on grating G1 surface, to close the form of bundle, is incident to grating G2.
2, the parameter of reflecting body phase grating G2 is determined and the optimal design of diffraction efficiency
Referring to accompanying drawing 4, the ruddiness that it provides for the present embodiment, blue light and green glow three beams combiner schematic diagram; λ
rand λ
bmainly with transmission form, pass through grating G2, and λ
gwith diffraction form, by grating G2, finally realize the bundle that closes of RGB tri-coloured light.For meeting the parameter of this condition grating G2, by formula (6) and (7), determine space frequency
=4049 lp/mm, within refractive index modulation degree Δ n is controlled at 0.02～0.04 scope, determine grating medium refraction index degree of modulation Δ n by formula (8) and G-solver software
2=0.03, grating dielectric thickness d
2=24um.
(6)
(7)
= 4049 lp/mm 。
（8）
In formula: Δ n is DCG medium refraction index degree of modulation,
for the cycle of grating G2, d is grating thickness, θ
4for the angle of incident light wave and normal,
for the Polarization Dependent Loss of green glow,
for green glow off-Bragg vector.Result of calculation obtains the parameter of reflecting body phase grating G2:
=4049 lp/mm, Δ n
2=0.03, grating dielectric thickness d
2=24um.
Referring to accompanying drawing 5, the diffraction efficiency curve figure of the reflecting body phase holographic grating G2 that it provides for the present embodiment; Grating G2 is at λ
gthe diffraction efficiency at=532nm place is 100%, at λ
r=635nm place and λ
b=473nm place diffraction efficiency is close to 0.Therefore, in grating G2, Red and blue light passes through with the form of 0 order diffraction (being transmission), and green glow passes through with the form of 1 order diffraction, and due to λ
gincident angle on G2 and angle of diffraction are also Mirror Symmetry with respect to peak value stripe surface, therefore, three coloured light exit direction on grating G2 is consistent, final vertical outgoing from a right angle face of isosceles right-angle prism P2 in the same direction, thus realize the beam function that closes of RGB tri-coloured light.
The present embodiment provides a kind of novel RGB tri-coloured light bundling device parts that transmission and reflecting body phase holographic grating be core devices of take.Take DCG as holographic recording medium, according to bragg condition, determine the frequently empty of two gratings, adopt Kogelnik coupled wave theory and G-solver software to be optimized design to the diffraction efficiency of transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2, obtained G1 at ruddiness λ
rthe diffraction efficiency at=635nm place reaches 100%, at blue light λ
b=473nm place diffraction efficiency approaches 0, and G2 is at ruddiness λ
gthe diffraction efficiency at=532nm place reaches 100%, at ruddiness λ
r=635nm and blue light λ
bthe diffraction efficiency at=473nm place approaches 0 result.This two grating and two isosceles right-angle prisms is combined, when RGB tri-coloured light (are s polarized light, be that vibration plane is perpendicular to the plane of incidence) while being normally incident in respectively three right angle faces of two isosceles right-angle prisms with the angle of 90 ° each other, the vertical outgoing from a right angle face of isosceles right-angle prism in the same direction of final RGB tri-coloured light, thus realize the beam function that closes of RGB tri-coloured light.
Can be by increasing λ/2 wave plate, when being also applicable to RGB tri-coloured light and being p polarized light (being that vibration plane is parallel to the plane of incidence), this bundling device closes bundle.Because body phase holographic grating has, diffraction efficiency is high, signal to noise ratio (S/N ratio) is high, scattering is low and absorb the performances such as low, and the novel bundling device that the utility model provides is conducive to improve the utilization factor of luminous energy, at laser projection system, has potential application foreground.
Embodiment 2
Referring to accompanying drawing 6, it is the structure of the body phase holographic grating bundling device that provides of the present embodiment and uses light path schematic diagram; In the present embodiment, their incident relation of RGB tri-coloured light is respectively:
Grating G1: (wavelength is λ to ruddiness
r) and green glow (wavelength is λ
g) through transmissive body phase holographic grating G1, now G1 is to λ
gdiffraction efficiency maximum and to λ
rdiffraction efficiency minimum.
Grating G2: (wavelength is λ to ruddiness
r), (wavelength is λ to green glow
g) and blue light (wavelength X
b) through reflecting body phase holographic grating G2, the now λ of G2 to this incident
rand λ
gdiffraction efficiency all minimum, and (wavelength is λ to blue light
b) diffraction efficiency maximum.
1, grating G1 parameter determines
Referring to accompanying drawing 7, it is wavelength-diffraction efficiency (+1 grade) distribution curve of the present embodiment transmissive body phase holographic grating G1; Fig. 7 is known, and transmissive body phase holographic grating G1 is at λ
g=532nm place diffraction efficiency approaches 100%, and at λ
r=635nm place diffraction efficiency is close to 0, and therefore, in grating G1, green glow and ruddiness pass through with the form of 1 order diffraction and 0 order diffraction (being transmission) respectively.And due to green glow and ruddiness with 90 ° of angle outgoing each other the surface to grating G1, and incident angle and the angle of diffraction of green glow in G1 medium is Mirror Symmetry with respect to peak value stripe surface, therefore, green glow is consistent in the exit direction on grating G1 surface with ruddiness, to close the form of bundle, is incident to grating G2.By the method for embodiment 1, draw G1 parameter: f=4040 lp/mm, Δ n=0.02, d=9.5um.
2, grating G2 parameter determines
Referring to accompanying drawing 8, it is wavelength-diffraction efficiency (+1 grade) distribution curve of the present embodiment reflecting body phase holographic grating G2; In grating G2, ruddiness and green glow pass through with the form of 0 order diffraction (being transmission), and blue light passes through with the form of 1 order diffraction, and due to λ
bincident angle on G2 and angle of diffraction are also Mirror Symmetry with respect to peak value stripe surface, therefore, three coloured light exit direction on grating G2 is consistent, final vertical outgoing from a right angle face of isosceles right-angle prism P2 in the same direction, thus realize the beam function that closes of RGB tri-coloured light.By the method for embodiment 1, draw G2 parameter: f=4554 lp/mm, d=20um, Δ n=0.03.
Embodiment 3
Referring to accompanying drawing 9, it is the structure of the body phase holographic grating bundling device that provides of the present embodiment and uses light path schematic diagram; In the present embodiment, their incident relation of RGB tri-coloured light is respectively:
Grating G1: (wavelength is λ to blue light
b) and green glow (wavelength is λ
g) through transmissive body phase holographic grating G1, now G1 is to λ
bdiffraction efficiency maximum and to λ
gdiffraction efficiency minimum.
Grating G2: blue light (wavelength X
b), (wavelength is λ to green glow
g) and ruddiness (wavelength is λ
r) through reflecting body phase holographic grating G2, the now λ of G2 to this incident
band λ
gdiffraction efficiency all minimum, and (wavelength is λ to ruddiness
r) diffraction efficiency maximum.
1, grating G1 parameter determines
Referring to accompanying drawing 10, it is wavelength-diffraction efficiency (+1 grade) distribution curve of the present embodiment transmissive body phase holographic grating G1; As shown in Figure 12, transmissive body phase holographic grating G1 is at λ
b=473nm place diffraction efficiency approaches 100%, and at λ
g=532nm place diffraction efficiency is close to 0, and therefore, in grating G1, blue light and green glow pass through with the form of 1 order diffraction and 0 order diffraction (being transmission) respectively.And due to blue light and green glow with 90 ° of angle outgoing each other the surface to grating G1, and incident angle and the angle of diffraction of green glow in G1 medium is Mirror Symmetry with respect to peak value stripe surface, therefore, blue light is consistent in the exit direction on grating G1 surface with green glow, to close the form of bundle, is incident to grating G2.By embodiment 1 method, obtain G1 parameter: f=4543 lp/mm, Δ n=0.02, d=8.5 um.
2, grating G2 parameter determines
Referring to accompanying drawing 11, it is wavelength-diffraction efficiency (+1 grade) distribution curve of the present embodiment reflecting body phase holographic grating G2.In grating G2, blue light and green glow pass through with the form of 0 order diffraction (being transmission), and ruddiness passes through with the form of 1 order diffraction, and due to λ
rincident angle on G2 and angle of diffraction are also Mirror Symmetry with respect to peak value stripe surface, therefore, three coloured light exit direction on grating G2 is consistent, final vertical outgoing from a right angle face of isosceles right-angle prism P2 in the same direction, thus realize the beam function that closes of RGB tri-coloured light.By embodiment 1 method, draw G2 parameter: f=3392 lp/mm, d=30um, Δ n=0.03.
Claims (2)
1. RGB tri-coloured light bundling devices, is characterized in that: the transmissive body phase holographic grating G1 that it comprises two identical isosceles right-angle prisms, the dichromated gelatin of take is holographic recording medium and reflecting body phase holographic grating G2; The peak value stripe surface of transmissive body phase holographic grating G1 is vertical with grating surface, and the peak value stripe surface of reflecting body phase holographic grating G2 is parallel with grating surface; Put in opposite directions the bottom surface of two isosceles right-angle prisms, places respectively transmissive body phase holographic grating G1 and reflecting body phase holographic grating G2 between two bottom surfaces, by epoxy resin bonding, is encapsulated.
2. a kind of RGB tri-coloured light bundling devices according to claim 1, is characterized in that: by three
wave plate is placed in respectively between each right angle face of laser instrument and isosceles right-angle prism.
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| CN201320730920.XU CN203786406U (en) | 2013-11-19 | 2013-11-19 | RGB three-color beam combiner |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018064949A1 (en) * | 2016-10-09 | 2018-04-12 | 山东大学 | Composite material-encapsulated fiber grating sensor and manufacturing method therefor |
| CN110989182A (en) * | 2019-11-29 | 2020-04-10 | 中国科学院长春光学精密机械与物理研究所 | Beam combination light source device |
-
2013
- 2013-11-19 CN CN201320730920.XU patent/CN203786406U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018064949A1 (en) * | 2016-10-09 | 2018-04-12 | 山东大学 | Composite material-encapsulated fiber grating sensor and manufacturing method therefor |
| US10399286B2 (en) | 2016-10-09 | 2019-09-03 | Shandong University | Composite material packaged fiber grating sensor and manufacturing method thereof |
| CN110989182A (en) * | 2019-11-29 | 2020-04-10 | 中国科学院长春光学精密机械与物理研究所 | Beam combination light source device |
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Granted publication date: 20140820 Termination date: 20171119 |