CN109031871A - A kind of laser light source and laser-projector - Google Patents
A kind of laser light source and laser-projector Download PDFInfo
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- CN109031871A CN109031871A CN201810928243.XA CN201810928243A CN109031871A CN 109031871 A CN109031871 A CN 109031871A CN 201810928243 A CN201810928243 A CN 201810928243A CN 109031871 A CN109031871 A CN 109031871A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
This application discloses a kind of laser light source and laser-projectors.The laser light source includes: at least two lasers, and at least two laser transmitting laser optical path in be arranged collimating components, balzed grating,.At least two lasers, for emitting the laser of at least two colors；The laser beam of at least two lasers transmitting is incident to collimating components, and is collimated after component is collimated and guides to the balzed grating,；Incident laser beam light combination is coaxial mixed light beam by balzed grating,.
Description
Technical field
This application involves optical technical field more particularly to a kind of laser light sources and laser-projector.
Background technique
In tricolor laser projector, the laser for needing noise spectra of semiconductor lasers to issue carries out light combination, the light after making light combination
Beam enters light component.
For tricolor laser projector, industry generallys use fiber coupling mode at present or space light combination mode realizes height
Bright light source.
Using fiber coupling mode, tricolor laser can be coupled into an optical fiber with a bank.Fig. 1 is shown
Using the schematic illustration of fiber coupling mode, shaping is carried out to the laser beam that laser issues first, then by a piece of non-
Spherical lens is a branch of by redgreenblue Laser synthesizing finally by optical-fiber bundling device by laser beam coupled into optical fibres.It is blue
Green laser is since laser light-emitting area is small, and each bank can be coupled into 200 microns of optical fiber, but red laser shines
Area is about bluish-green 10 times, and the light beam of bank is needed by depth shaping, and can only be coupled into 1 millimeter of optical fiber.
(85% or so coupling effect is preferably not higher than since visible light optical fiber transmission efficiency is not generally high on the market at present
Rate), it will increase fiber lengths to increase arrangement flexibility, and the increase of fiber lengths can further decrease fiber coupling effect
Rate causes the energy of the 15% to 20% of semiconductor laser to convert antibody Monoclonal ability and heat dissipation dress for waste heat, to optical fiber
It sets more demanding.
Space light combination spatially can carry out light combination realization to tricolor laser by dichroic piece.As shown in Fig. 2,
It is provided with the first eyeglass in the optical path of blue laser diode LD1, is provided with second in the optical path of green laser diode LD2
Eyeglass is provided with third eyeglass in the optical path of red laser diode LD3.First eyeglass, the second eyeglass and third eyeglass are equal
For dichroic piece, installed with 45 ° of reflection angles.The blue laser that blue laser diode LD1 is issued is through the first eyeglass and the
Two eyeglasses, by third lens reflecting to transmission-type focus lamp；The green laser that green laser diode LD2 is issued is successively by second
Transmission-type focus lamp is incident to after eyeglass and third lens reflecting；The red laser that red laser diode LD3 is issued is through the
Three eyeglasses are incident to transmission-type focus lamp.In this way, final tricolor semiconductor laser beam light combination, which enters optical tunnel, carries out even light.
In above-mentioned space light combination scheme, need to carry out light combination using dichroic piece.Dichroic piece is prepared by film plating process,
More demanding to coating process, dichroic chip size is bigger, and the difficulty of plated film also can be bigger.45 ° of reflection angles of dichroic piece
Location tolerance requires also more stringent, and otherwise each primary color laser can not carry out effective light combination, the optical axis center of each primary color laser without
Method is effectively overlapped, and the color uniformity of projected image is caused to be deteriorated.
Summary of the invention
The embodiment of the present application provides a kind of laser light source and laser-projector.
In a first aspect, providing a kind of laser light source, which includes: at least two lasers, and it is described extremely
Lack the collimating components being arranged in the laser optical path of two lasers transmitting, balzed grating,.Wherein, at least two laser,
For emitting the laser of at least two colors；The laser beam of at least two lasers transmitting is incident to collimating components, and
It guides after being collimated by the collimating components to the balzed grating,；Incident laser beam light combination is by the balzed grating,
Coaxial mixed light beam.
According to above-described embodiment, balzed grating, is set in laser optical path, swashing for different colours is realized by balzed grating,
The light combination of light light beam, compared with using 3 dichroic pieces in the prior art, the element that the embodiment of the present application uses is single, skill
Art realization is simple and easy, and balzed grating, is easy extensive manufacture and duplication, can reduce cost.
In one possible implementation, the blaze angle of the balzed grating, at least two laser emit
Relationship between the incidence angle and the angle of diffraction of laser beam are as follows: n λ=d (sin α ± sin β).Wherein, α is entering for laser beam
Firing angle, α=β+θ, β are the angle of diffraction of laser beam, and θ is the blaze angle of balzed grating, and d is grating constant, and n is spectrum progression, λ
For the wavelength of laser beam.
According to above-described embodiment, it can be based on grating principle, incidence angle or the position of laser are set, effectively closed with realizing
Light.
In one possible implementation, the balzed grating, is reflective balzed grating, or transmission-type balzed grating,.
Optionally, the transmission-type balzed grating, includes gradual period bending-type balzed grating,.
According to above-described embodiment, when using reflective balzed grating, it is made since reflective balzed grating, is generally metal,
Its back side can form preferable heat dissipation area, be easy and fast to take away the waste heat of a small amount of system laser energy production of balzed grating,.
In addition, grating coupling light combination efficiency can also be made to reach 90% or more, and each primary colours semiconductor swashs using reflective balzed grating,
The coaxial light combination precision of light device is available to be effectively ensured.
In one possible implementation, when the balzed grating, is gradual period bending-type balzed grating, according to sharp
The sequence of optical wavelength from small to large, for emitting laser and the gradual change week of corresponding laser at least two laser
The distance between phase bending-type balzed grating, is sequentially increased.
According to above-described embodiment, when using easy period bending-type balzed grating, by with optical maser wavelength from small to large
Sequentially, the position that laser is arranged is for emitting between the laser of corresponding laser and gradual period bending-type balzed grating,
Distance is sequentially increased, so that the focal position of each laser is in the same plane, realizes effective light combination.
In one possible implementation, when the balzed grating, is gradual period bending-type balzed grating, the standard
Straight member is achromatic lens.
According to above-described embodiment, when using easy period bending-type balzed grating, use achromatic lens that can make respectively
The focal position of laser in the same plane, realizes effective light combination.
In one possible implementation, the collimating components are reflective focus lamp or transmission-type focus lamp.
In one possible implementation, at least two laser, comprising: the laser for transmitting red laser beam
Device, for emitting the laser of green laser, for emitting the laser of blue laser.
Second aspect provides a kind of laser-projector, which includes ray machine, camera lens and such as above-mentioned first party
Laser light source described in any one of face；The laser light source provides illumination for the ray machine, the ray machine to light beam of light source into
Row modulation, and export to the camera lens and be imaged, projection to projection medium forms projected picture.
Detailed description of the invention
The space light combination structural schematic diagram of Fig. 1 tricolor semiconductor laser in the prior art；
Fig. 2 is a kind of structural schematic diagram of laser light source provided by the embodiments of the present application；
Fig. 3 is reflecting grating microstructure schematic diagram in the embodiment of the present application；
Fig. 4, Fig. 5, Fig. 6 are respectively the structural schematic diagram for the laser light source that the application other embodiments provide；
Fig. 7 A and Fig. 7 B are respectively the light combination principle signal of the gradual period bending-type balzed grating, in the embodiment of the present application
Figure；
Fig. 8, Fig. 9 are respectively the schematic diagram for applying the laser light source of gradual period bending-type balzed grating,；
Figure 10 is the structural schematic diagram of laser-projector provided by the embodiments of the present application.
Specific embodiment
The embodiment of the present application uses balzed grating, is divided principle using balzed grating, to realize different semiconductor lasers
Effective light combination.
Specifically, in Multiplexing apparatus provided by the embodiments of the present application include at least two lasers, and it is described at least
Two lasers transmitting laser optical path in be arranged collimating components, balzed grating,.Wherein, at least two laser is used
In the laser for emitting at least two colors；The laser beam of at least two laser transmitting is incident to collimating components, and by
The collimating components guide after being collimated to the balzed grating,；Incident laser beam light combination is total by the balzed grating,
Axis mixed light beam.The coaxial mixed light beam can be incident to the light component, and the light component is to incident coaxial mixed light
The even light of Shu Jinhang.
In Multiplexing apparatus provided by the embodiments of the present application, the element for carrying out light combination is balzed grating, with use 3 two
It is compared to color chips, the element that the embodiment of the present application uses is single.And balzed grating, is easy extensive manufacture and duplication, can reduce
Cost.
Balzed grating, (blazed grating) be it is a kind of particular diffraction order not Chan Sheng maximum diffraction efficiency it is specific
Diffraction grating structure.When the wire casing section of grating ruling toothing, the light energy of grating is just concentrated in a predetermined direction,
On the i.e. a certain order of spectrum.When from this orientation detection, the maximum intensity of spectrum, this phenomenon is known as glittering (blaze), this light
Grid are known as balzed grating,.
In the balzed grating, being carved into this way, the groove face for playing diffraction is a smooth plane, the surface of it and grating
The angle for being in is known as blaze angle (blaze angle).Wavelength corresponding to maximum light intensity, referred to as blaze wavelength (blaze
wavelength).By blaze angle, grating can be made to be suitable for certain first-order spectrum of a certain specific band.
Balzed grating, can be divided into reflective balzed grating, and transmission-type balzed grating, can also include gradual period bending-type
Balzed grating, will not enumerate herein.
Relationship according to grating beam splitting principle, between the blaze angle of balzed grating, the incidence angle of laser beam and the angle of diffraction
Are as follows:
N λ=d (sin α ± sin β) ... ... ... ... ... ... ... [1]
By taking reflective balzed grating, as an example, as shown in figure 3, α is the incidence angle (positive value) of laser beam, α=β+θ, β are sharp
The angle of diffraction of light light beam, θ are the blaze angle (generally 10 ° or so) of reflective balzed grating, and d is grating constant, and n is the order of spectrum
Number, λ are the wavelength of laser beam.
Below for being applied to the Multiplexing apparatus of tricolor laser projector, the embodiment of the present application is carried out in conjunction with attached drawing
Detailed description.
It referring to fig. 4, is a kind of structural schematic diagram of Multiplexing apparatus 300 provided by the embodiments of the present application.
As shown, including first laser device 301, second laser 302 and third laser 303 in Multiplexing apparatus 300.
Wherein, first laser device 301 emits blue laser, and second laser 302 emits green laser, and third laser 303 emits red
Color laser.First laser device 301, second laser 302 and third laser 303 can be semiconductor laser,
The blue laser beams 10 that first laser device 301 emits, the green laser beam 20 that second laser 302 emits,
The red laser light beam 30 that third laser 303 emits, is incident on reflective focus lamp 304 respectively.
Optionally, first laser device 301 can also be replaced by the laser of one group of transmitting blue laser, second laser 302
It can also be replaced by the laser of one group of transmitting green laser, third laser 303 can also be by the laser generation of one group of transmitting feux rouges
It replaces.
Incident laser beam is reflexed to reflective balzed grating, 305 by reflective focus lamp 304.Wherein, reflective poly-
Burnt mirror 304 has collimating effect.Normal daylight is diverging, that is, starting can be mutually from increasingly after two adjacent light are propagated
Far, collimation is exactly the light that the light of transmitting is become to collimation (close to parallel).Based on reflective focus lamp 304, first can be made
Laser 301 emits blue laser beams 10 and becomes collimated light beam after the reflection of reflective focus lamp 304, so that second laser
The green laser beam 20 of 302 transmittings becomes collimated light beam after the reflection of reflective focus lamp 304, so that third laser 303
The red laser light beam 30 of transmitting becomes collimated light beam after the reflection of reflective focus lamp 304.
Reflective balzed grating, 305 focuses incident laser beam light combination by transmission-type after coaxial mixed light beam 40
Mirror 306 is incident to even smooth component 307.Wherein, reflective balzed grating, 305 can be by incident blue laser beams, green
Laser beam and red laser light beam carry out light combination, obtain coaxial mixed white light light beam.
The incident coaxial mixed light beam 40 of 307 pairs of even smooth component carries out even light.Optionally, even smooth component 307 can be even
Light optical wand is also possible to fly's-eye lens or microlens array.
(dmd chip is used in single digital light processing (digital light processing, DLP) system
DLP system, wherein DMD is the english abbreviation of Digital Micro-mirror Device, i.e. digital micromirror elements) in, it should
Coaxial mixed light beam can be used as the use of timesharing colour mixture light.In 3DLP system (using the DLP system of three dmd chips),
The coaxial mixed light can be used as the spacing color mixed light of middle conduct and use.Coaxial mixed light beam is by transmission-type focus lamp to match
The angle incidence of the etendue of DMD enters light component, and the ray machine of laser-projector is eventually entered by the light beam of even light
Middle formation color image.
According to formula (1) it is found that for identical spectrum progression n, in order to make the laser beam of different wave length spread out with identical
Firing angle is emitted to form light combination, then the laser beam of respective wavelength can be determined according to the wavelength X of laser beam, blaze angle θ
Incident angle α, and then can determine the position of corresponding laser or the Laser emission angle of corresponding laser.
It is concentrated on first-order spectrum with the light energy of reflective balzed grating, i.e., reflective balzed grating, is suitable for laser-based
It is blue since blue laser wavelength is short for first-order spectrum in general section of color (spectrum progression n=± 1 i.e. in formula (1))
The incident angle α of color laser is small, red laser wavelength longest, therefore the incident angle α of red laser is big, and the incidence angle of green laser is situated between
Between the incidence angle of blue laser and the incidence angle of red laser.
For example, in the case where grating d is 10 μm~50 μm.Red laser incident angle α is 5 °~10 °, and green laser enters
Firing angle is 8 °~12 ° bigger than red laser incidence angle, and blue laser incidence angle is 8 °~12 ° bigger than green laser incidence angle.
According to the incidence angle of blue laser, green laser and red laser, the laser emitting of corresponding laser can be determined
The position of angle or laser.This way it is possible to realize the light combination of tricolor semiconductor laser beam acts on.By balzed grating,
The light combination efficiency that can make first-order spectrum is more than 90%, while the semiconductor laser beam of each primary colours can be with identical diffraction
Angle beta outgoing.
Reflective balzed grating, is typically constructed of metal, and the back side can form preferable heat dissipation area, is easy and fast to band
Walk the waste heat of a small amount of system laser energy production of balzed grating,.In addition, grating can also be made to couple using reflective balzed grating,
Light combination efficiency reaches 90% or more, and the coaxial light combination precision of each primary colours semiconductor laser available is effectively ensured.
In a further embodiment, the reflective focus lamp in Multiplexing apparatus 300 can be transmitted formula focus lamp substitution, this is thoroughly
Formula focus lamp is penetrated with collimating effect.Correspondingly, the laser that first laser device, second laser and third laser emit enters
Firing angle degree is also adaptively adjusted, so that the laser beam of these lasers transmitting is incident to the transmission-type focus lamp, and by this
Transmission-type focus lamp is transmitted through reflective balzed grating,.Fig. 5 schematically illustrate include above-mentioned transmission-type focus lamp conjunction
Electro-optical device 400.
As shown in figure 5, first laser device 401 emits blue laser beams, second laser 402 emits green laser light
Beam, 403 transmitting red laser beam light beam of third laser.The laser beam of these lasers transmitting is incident to the focusing of the first transmission-type
Mirror 404, and reflective balzed grating, 405 is transmitted through after being collimated by the first transmission-type focus lamp.Reflective balzed grating, 405
It is to be incident to even smooth component 407 after coaxial mixed light beam by incident laser beam light combination.407 pairs of even smooth component is incident
Coaxial mixed light beam carries out even light.
Wherein, first laser device 401, second laser 402, third laser 403, reflective balzed grating, 405, second
Transmission-type focus lamp 406, light component 407, it is identical as the function of corresponding component in Multiplexing apparatus 200, it is not repeated herein.
According to grating beam splitting principle, between the blaze angle of reflective balzed grating, the incidence angle of laser beam and the angle of diffraction
Relationship meet aforementioned formula (1).According to formula (1) it is found that for identical spectrum progression n, in order to make the laser of different wave length
Light beam is emitted with the identical angle of diffraction to form light combination, then can determine corresponding wave according to the wavelength X of laser beam, blaze angle θ
The incident angle α of long laser beam, and then can determine the position of corresponding laser or the laser emission angle of corresponding laser
Degree.
In a further embodiment, the reflective balzed grating, in Multiplexing apparatus 200 or Multiplexing apparatus 400 can be transmitted formula
Balzed grating, substitution changes accordingly, due to the optical path of laser beam, and the position for the associated components being arranged in the optical path also needs
It is adaptively adjusted, so that the laser beam of laser transmitting is collimated to be incident to the transmission-type balzed grating,.
Fig. 6 schematically illustrate include transmission-type balzed grating, Multiplexing apparatus 500.
As shown in fig. 6, first laser device 501 emits blue laser beams, second laser 502 emits green laser light
Beam, 503 transmitting red laser beam light beam of third laser.The laser beam of these lasers transmitting is incident to the focusing of the first transmission-type
Mirror 504, and transmission-type balzed grating, 505 is transmitted through after being collimated by the first transmission-type focus lamp 504.Transmission-type balzed grating,
Incident laser beam light combination is to be incident to even smooth component through the second transmission-type focus lamp 506 after coaxial mixed light beam by 505
507.The incident coaxial mixed light beam of 507 pairs of even smooth component carries out even light.
Wherein, first laser device 501, second laser 502, third laser 503, the second transmission-type focus lamp 506,
Light component 507, it is identical as the function of corresponding component in Multiplexing apparatus 400, it is not repeated herein.
According to grating beam splitting principle, between the blaze angle of reflective balzed grating, the incidence angle of laser beam and the angle of diffraction
Relationship meet aforementioned formula (1).According to formula (1) it is found that for identical spectrum progression n, in order to make the laser of different wave length
Light beam is emitted with the identical angle of diffraction to form light combination, then can determine corresponding wave according to the wavelength X of laser beam, blaze angle θ
The incident angle α of long laser beam, and then can determine the position of corresponding laser or the laser emission angle of corresponding laser
Degree.
Transmission-type grating may include gradual period bending-type balzed grating,.Fig. 7 A and Fig. 7 B are bent to gradual period respectively
The light path principle of formula balzed grating, is illustrated.The thickness of some gradual period bending-type balzed grating,s used in reality is variation
(similar lens), and grating space gradually becomes smaller to centre from both sides, principle is equivalent are as follows: a uniform grating is convex plus one
Lens.
Fig. 7 A shows a kind of light combination principle of gradual period bending-type balzed grating, which glares
The incidence surface of grid is curved surface, if as shown, object point A sending is blue laser, by the sudden strain of a muscle of gradual period bending-type
Picture point A1 is imaged on after credit grating；If what object point A was issued is green laser, since its wavelength is greater than blue laser, then it is passed through
Picture point A2 is imaged on after crossing gradual period bending-type balzed grating,；If what object point A was issued is red laser, since its wavelength is big
In green laser, then it is imaged on picture point A3 after gradual period bending-type balzed grating,.As can be seen that due to different colours
Laser wavelength it is different, the distance between corresponding picture point and gradual period bending-type balzed grating, be not no when identical for object point position
Together, wherein from small to large according to wavelength, distance is also from being short to long (distance z1, z2, z3 in such as figure).It is reversible according to optical path
Blue laser can be arranged in position A1, by green laser setting in position A2, red laser setting is existed by principle
Position A3, in this way, tricolor laser light beam can be in position A light combination.
Fig. 7 B shows the light combination principle of another gradual period bending-type balzed grating, gradual period bending-type glittering
The light-emitting surface of grating is curved surface.As shown, the green laser that object point A is issued, then it glares by gradual period bending-type
Picture point A ' is imaged on after grid；The red laser that object point B is issued, since its wavelength is greater than green laser, then it passes through gradual period
Picture point B ' is imaged on after bending-type balzed grating,；What object point C was issued is blue laser, since its wavelength is less than green laser, then
It is imaged on picture point C ' after gradual period bending-type balzed grating,.As can be seen that the wavelength of the laser due to different colours
Difference, object point position when identical corresponding picture point it is different from the distance between gradual period bending-type balzed grating, wherein according to
From small to large, distance is also from being short to long (distance z1, z2, z3 in such as figure) for wavelength.
When being managed using Fig. 7 B primitive, in order to reach coaxial white light purpose, tri-color laser green laser, red laser
Device, blue laser are respectively arranged at A, and tri- positions B, C, (three kinds of colors are not because refractive index difference can for colour cast in order to prevent
Converge to same point on optical axis), an achromatic lens can be increased behind grating, so that the light beam of three primary colours focuses
Point is overlapped, and achievees the effect that mixed white light not colour cast.
Based on the light combination principle of above-mentioned gradual period bending-type balzed grating, Fig. 8, Fig. 9 respectively illustrate one kind and include
The schematic diagram of the Multiplexing apparatus of gradual period bending-type balzed grating,.
In Multiplexing apparatus 600 as shown in Figure 8, first laser device 601 emits blue laser beams, second laser 602
Emit green laser beam, 603 transmitting red laser beam light beam of third laser.The laser beam of these lasers transmitting is incident to
Incident laser beam light combination is coaxial by gradual period bending-type balzed grating, 604, gradual period bending-type balzed grating, 604
Even smooth component 607 is incident to through transmission-type focus lamp 605 after mixed light beam.The incident coaxial mixed light beam of 606 pairs of even smooth component
Carry out even light.
Wherein, the incidence surface of gradual period bending-type balzed grating, 604 is curved surface.It is curved based on gradual period shown in Fig. 7 A
The light combination principle of musical form balzed grating, according to the structure of the gradual period bending-type balzed grating, and the laser of different colours
Wavelength, emit the first laser device of blue laser and being closer for gradual period bending-type balzed grating, 604, transmitting is red
The third laser of laser farther out, emits the second laser of green laser at a distance from gradual period bending-type balzed grating, 604
Device falls between at a distance from gradual period bending-type balzed grating, 604, so that the three colors laser is bent through gradual period
Same plane can be focused on after formula balzed grating, 604.
Optionally, first laser device 601, second laser 602, third laser 603 may be alternatively provided as and gradual period
The distance of bending-type balzed grating, 604 is identical, and transmission-type focus lamp 605 can be replaced with achromatic lens, so that first
The laser beam that laser 601, second laser 602, third laser 603 emit is through gradual period bending-type balzed grating,
It can be focused in the same plane after 604.
Optionally, pass through setting first laser device 601, second laser 602, the position of third laser 603 or transmitting
Angle, so that the incidence angle of the laser of these lasers transmitting is within the scope of 10 °.
Wherein, first laser device 601, second laser 602, third laser 603, transmission-type focus lamp 605, light portion
Part 606, it is identical as the function of corresponding component in Multiplexing apparatus 400, it is not repeated herein.
In Multiplexing apparatus 700 as shown in Figure 9, first laser device 701 emits blue laser beams, and second laser 702 is sent out
Penetrate green laser beam, 703 transmitting red laser beam light beam of third laser.The laser beam of these lasers transmitting is incident to gradually
Incident laser beam light combination is coaxial mixed by variable period bending-type balzed grating, 704, gradual period bending-type balzed grating, 704
Even smooth component 707 is incident to after light combination beam.The incident coaxial mixed light beam of 706 pairs of even smooth component carries out even light.
Optionally, achromatic lens is provided with before gradual period bending-type balzed grating, 704 and even smooth component 706
705。
Wherein, the light-emitting surface of gradual period bending-type balzed grating, 704 is curved surface.It is curved based on gradual period shown in Fig. 7 B
The light combination principle of musical form balzed grating, according to the structure of the gradual period bending-type balzed grating, and the laser of different colours
Wavelength, when first laser device, second laser and third laser are generally aligned in the same plane (i.e. with gradual period bending-type dodge
Shine grating 704 distance it is identical), laser beam the focal position after gradual period bending-type balzed grating, 704 not
Together, specifically, if along optic path direction, on optical axis, blue laser is assembled at first, and followed by green laser and red swash
Light.By the way that achromatic lens 705 is arranged after gradual period bending-type balzed grating, 704, each color laser beam can be made
Focal position in one plane.
Optionally, first laser device 701, second laser 702, third laser 703 may be alternatively provided as and gradual period
The distance of bending-type balzed grating, 704 is not identical, and the first laser device and gradual period bending-type for emitting blue laser glare
Grid 604 are closer, the third laser of transmitting red laser beam at a distance from gradual period bending-type balzed grating, 604 compared with
Far, the second laser for emitting green laser falls between at a distance from gradual period bending-type balzed grating, 604, so that
The laser beam that first laser device 601, second laser 602, third laser 603 emit is obtained to glitter through gradual period bending-type
It can be focused in the same plane after grating 604.
Optionally, pass through setting first laser device 701, second laser 702, the position of third laser 703 or transmitting
Angle, so that the incidence angle of the laser of these lasers transmitting is within the scope of 10 °.
Wherein, first laser device 701, second laser 702, third laser 703, transmission-type focus lamp 705, light portion
Part 706, it is identical as the function of corresponding component in Multiplexing apparatus 600, it is not repeated herein.
The embodiment of the present application also provides the structures of laser-projector.As shown in Figure 10, which may include
Ray machine 820, camera lens 830 and the laser light source 810 as described in previous embodiment, laser light source 810 are that ray machine 820 provides photograph
Bright, ray machine 820 is modulated light beam of light source, and exports to camera lens 830 and be imaged, and projection is formed to projection medium 840 and thrown
Shadow picture.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of laser light source characterized by comprising at least two lasers, and sent out at least two laser
The collimating components that are arranged in the laser optical path penetrated, balzed grating,；
At least two laser, for emitting the laser of at least two colors；
The laser beam of at least two laser transmitting is incident to collimating components, and after being collimated by the collimating components
It guides to the balzed grating,；
Incident laser beam light combination is coaxial mixed light beam by the balzed grating,.
2. laser light source as described in claim 1, which is characterized in that the blaze angle of the balzed grating, described at least two
Relationship between the incidence angle and the angle of diffraction of the laser beam of laser transmitting are as follows:
N λ=d (sin α ± sin β)
Wherein, α is the incidence angle of laser beam, and α=β+θ, β are the angle of diffraction of laser beam, and θ is the blaze angle of balzed grating, d
For grating constant, n is spectrum progression, and λ is the wavelength of laser beam.
3. laser light source as described in claim 1, which is characterized in that the balzed grating, is reflective balzed grating, or transmission
Formula balzed grating,.
4. laser light source as claimed in claim 3, which is characterized in that the transmission-type balzed grating, includes gradual period bending
Formula balzed grating,.
5. laser light source as claimed in claim 4, which is characterized in that according to the sequence of optical maser wavelength from small to large, it is described extremely
Lack the distance between laser and the gradual period bending-type balzed grating, in two lasers for emitting corresponding laser
It is sequentially increased.
6. laser light source as claimed in claim 4, which is characterized in that the collimating components are achromatic lens.
7. laser light source as described in claim 1, which is characterized in that the collimating components are reflective focus lamp or transmission-type
Focus lamp.
8. the laser light source as described in any one of claims 1 to 7, which is characterized in that at least two laser, packet
It includes:
For the laser of transmitting red laser beam, for emitting the laser of green laser, for emitting the laser of blue laser
Device.
9. a kind of laser-projector, which is characterized in that including ray machine, camera lens and as described in any item of the claim 1 to 8
Laser light source；
The laser light source provides illumination for the ray machine, and the ray machine is modulated light beam of light source, and exports to the mirror
Head is imaged, and projection to projection medium forms projected picture.
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