CN106569378B - A kind of laser dissipation spot light path and two-color laser light source, three color laser light sources - Google Patents
A kind of laser dissipation spot light path and two-color laser light source, three color laser light sources Download PDFInfo
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- CN106569378B CN106569378B CN201510643217.9A CN201510643217A CN106569378B CN 106569378 B CN106569378 B CN 106569378B CN 201510643217 A CN201510643217 A CN 201510643217A CN 106569378 B CN106569378 B CN 106569378B
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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
- G02B27/48—Laser speckle optics
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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
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Abstract
The invention discloses a kind of laser dissipation spot light paths, by the way that conical mirror and diffusion sheet are arranged in laser output light path, Gaussian laser light beam is carried out to homogenize shaping, it substantially reduces and nearby causes the stronger beam section of laser coherence positioned at 0 degree of optical axis, and combine the diffusion of diffusion sheet, the diversity for forming laser beam divergent angle degree, further decreases the spatial coherence of laser, solves speckle issue when laser light source application.The present invention is applied to technical field of laser display.
Description
Technical field
The present invention relates to technical field of laser display more particularly to a kind of laser dissipation spot light path and double-colored, three color laser
Light source.
Background technology
Laser is a kind of high brightness, and high directivity sends out the light source of monochromatic coherent light beam, due to the plurality of advantages of laser,
Gradually it is used as light source applications in projection display technique field in recent years.When the high coherence of laser brings laser projection display
Speckle effect, so-called speckle refers to coherent source when irradiating coarse object, the light after scattering, due to its wavelength phase
Together, phase-constant, will generate interference in space, some parts, which interfere, in space mutually grows, and has part to interfere phase
Disappear, final the result is that occurring granular light and dark spot on the screen, these unfocused spots are in human eye
In flicker state, viewing for a long time is also easy to produce dizziness sense of discomfort, more causes the deterioration of projected image quality, reduce user's
Viewing experience.
In the laser light source of practical application, laser light source type is more, and speckle effect is also more serious.For red blue laser
The two-color laser light source of device composition, human eye are higher than for blue laser the sensitivity of red laser speckle effect, because
The dissipation spot light path design of this red laser light source is just particularly important.
A variety of Speckles Techniques that disappear exist in the prior art.A kind of technology is to pass through the vibration of screen using the display screen of vibration
Weaken integral action of the speckle spot in human eye, but it is for large scale screen control and impracticable, and at present
Also direction develops without screenization direction for projection；A kind of technology is to utilize multimode fibre, and the length between adjacent fiber is made to be more than light source
Coherence length, to reduce coherence, but the volume of optical fiber is big, and the propagation path of light in a fiber is long, luminous energy loss
It is larger, it is not suitable for current miniaturization and highlighted desired laser light source design.And in the prior art also by laser optical path
The diffusion sheet or diffusion sheet of middle setting movement carry out dissipation spot, but effect is limited.
Invention content
The present invention provides a kind of laser dissipation spot light paths and two-color laser light source, three color laser light sources, can improve sharp
The dissipation spot effect of light solves the problems, such as speckle effect when laser light source application.
The present invention is achieved by the following technical solutions：
Present invention firstly provides a kind of laser dissipation spot light paths, including laser, send out laser, and be also at least arranged
Have conical mirror, and be placed in the diffusion sheet after conical mirror, laser passes sequentially through conical mirror and diffusion sheet, wherein conical mirror for pair
The laser beam carries out Energy distribution and homogenizes, and diffusion sheet is used to expand carrying out the laser beam after Energy distribution homogenizes
It dissipates.
Further, which is Conical Lenses.
Further, which does rotation or translational motion.
Further, which further includes shrink beam component, is used for incident taper after laser beam progress shrink beam
Mirror.
Further, which further includes collimating components, for the light beam dissipated after diffusion to be carried out collimation shape
At collimated light beam.
Further, which includes the telescopic system being made of a piece of convex lens and a piece of concavees lens.
Further, which includes convex lens or convex lens microscope group.
The present invention also provides a kind of two-color laser light sources, including blue laser and red laser, send out indigo plant respectively
Color laser and red laser；Fluorescent wheel is set in blue laser emitting light path, including phosphor region and transmission area, the phosphor region
It is provided with green emitting phosphor, green fluorescence is generated for being excited by blue laser, transmission area is used to transmit the blue laser,
Wherein, fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and blue laser and green fluorescence are through standard
Closing light component is reached after straight lens group；
And red laser reaches closing light component after dissipation spot light path, at least provided with taper in the dissipation spot light path
Mirror, and it is placed in the diffusion sheet after conical mirror, wherein conical mirror is used to homogenize red laser light beam progress Energy distribution, spreads
Red laser light beam after piece is used to homogenize the progress Energy distribution is diffused；
Blue laser, green fluorescence and red laser export after closing light to light guide member.
Further, conical mirror is Conical Lenses.
Further, diffusion sheet does rotation or translational motion.
Further, closing light component is dichroscope.
Further, dissipation spot light path further includes shrink beam component, for entering pencil after red laser light beam is carried out shrink beam
Shape mirror.
Further, dissipation spot light path further includes collimating components, for carrying out the red laser light beam dissipated after diffusion
Collimation forms collimated light beam.
Further, blue laser, green fluorescence and red laser also pass through before being exported after closing light to light guide member
Component is assembled, the angle of flare for reducing light beam after the closing light.
And technical solution of the present invention additionally provides a kind of three color laser light sources, including tri-color laser, send out it is red, green,
Blue three kinds of laser, above-mentioned three kinds of laser carry out dissipation spot after closing light by the laser dissipation spot light path of said program.
Technical solution of the present invention, at least have the advantages that following advantageous effects or：
The laser dissipation spot light path that technical solution of the present invention provides utilizes it by the way that conical mirror is arranged in laser optical path
Optical characteristics can break up the laser beam of Gaussian shaped profile to form class Bessel type light beam, even to the carry out of laser beam
Change shaping, becomes having multiple dispersion angles and each from the Energy distribution mode for concentrating on 0 degree of optical axis and neighbouring dispersion angle
The relatively homogenized distribution mode of the energy of dispersion angle substantially reduces and nearby causes laser coherence stronger positioned at 0 degree of optical axis
Beam section, and the diffusion sheet by being arranged after conical mirror, the laser beam after capable of being homogenized to carrying out Energy distribution
Further spread, so as to which the light beam of the various dispersion angles of class Bessel type light beam is further spread, enhancing hair
The random distribution of degree and dispersion angle is dissipated, reaching jointly makes the multifarious purpose of laser beam divergent angle degree, and dispersion angle
Diversity can result in the light path difference of light transmission, different optical path differences leads to different phase changes, to phase
Identical or phase difference constant probability just substantially reduces, and destroys one of the condition interfered, therefore alleviate the phase of laser
Speckle effect when dry degree and laser light source are applied, has achieved the purpose that dissipation spot.
Technical solution of the present invention carries out dissipation spot by using the combination of conical mirror and diffusion sheet, can fundamentally change
The characteristics of becoming gaussian laser type Energy distribution, to effectively eliminate the coherence that Gaussian shaped profile light beam itself has, and light path
Used in optical component quantity it is few, optics framework is simple, easy to utilize.
Technical solution of the present invention additionally provides a kind of two-color laser light source, including blue laser and red laser, by right
Red laser carries out dissipation spot using above-mentioned dissipation spot light path, enables red laser by the common of conical mirror and diffusion sheet
Effect, which reaches, makes the multifarious purpose of laser beam angle, to destroy the interference condition of phase or constant phase difference, mitigates red
The degree of coherence of color laser beam reduces the phase of red laser since human eye is more sensitive to the speckle effect of red laser
Dry degree also just alleviates speckle effect when two-color laser light source applications, achievees the purpose that two-color laser light source dissipation spot.
And in technical solution of the present invention, green fluorescence, green fluorescence and indigo plant are inspired after blue laser incident fluorescence wheel
Color laser is sequentially output by a fluorescence wheel component according to sequential, then with red laser, the blue laser and green after dissipation spot
Color fluorescence carries out closing light, dissipation spot light path and combining by a closing light component and closing light component is few, and optics framework is succinct, and energy
The laser lighting light source of low speckle, high brightness is enough provided.
The three color lasers that technical solution of the present invention provides, the three colors laser light source form light beam all the way after closing light,
And the laser dissipation spot light path formed by conical mirror and diffusion sheet, the work of dissipation spot is combined based on above-mentioned conical mirror and diffusion sheet
With process, three color laser light sources that technical solution of the present invention provides can effectively dissipate spot, provide the laser of low speckle, high brightness
Lighting source.
Description of the drawings
Fig. 1 is prior art conical mirror paths schematic diagram；
Fig. 2 is class bessel beam hot spot distribution schematic diagram；
Fig. 3 A are prior art Gaussian-shaped beam distribution schematic diagram；
Fig. 3 B are Gaussian-shaped beam hot spot distribution schematic diagram；
Fig. 4 is the laser dissipation spot light path schematic diagram that the embodiment of the present invention 1 provides
Fig. 5 is to pass through Laser beam energy distribution schematic diagram after conical mirror in the embodiment of the present invention 1；
Fig. 6 is to pass through Laser beam energy distribution schematic diagram after diffusion sheet in the embodiment of the present invention 1；
Fig. 7 is the laser dissipation spot light path schematic diagram that the embodiment of the present invention 2 provides；
Fig. 8 is Laser beam energy distribution schematic diagram in the embodiment of the present invention 2；
Fig. 9 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 3 provides；
Figure 10 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 4 provides；
Figure 11 is the three color laser light source structural schematic diagrams that the embodiment of the present invention 5 provides.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
Before introducing the specific embodiment of the invention, the optical characteristics of conical mirror is introduced first, and conical mirror has one
From plane side incidence, can be used for generating can be as distance increases diameter but keeps for a conical surface and a plane, wherein light
The non-diffraction annular beam of consistent annular thickness.As shown in Figure 1, when parallel beam incident to conical mirror plane side, through cone
Face refraction has the function of focus convergence, but the light for passing through conical surface vertex E outgoing is dissipated to multiple directions, thus by light beam
Energy is disperseed.Due to having the optical effect of convergence and diverging to light beam simultaneously, can be formed in the exit direction of conical mirror
The diamond crossing area of one light beam, dash area as shown in Figure 1, when in this region, than X/Y plane as shown in FIG. 1 into
When row imaging, it is observed that concentric multiple annular beams, as schematically shown in Figure 2.Wherein, in multiple concentric annular light beams
Beam energy positioned at the light beam of internal layer or by dipped beam ring center is weaker, and the light beam ring energy for being located at outer layer is stronger, is used in figure
The shade of light beam ring illustrates the comparative situation of light beam ring energy intensity.
Embodiment 1
The embodiment of the present invention 1 provides a kind of laser dissipation spot light path, can be one as shown in figure 4, including laser 1
Group is multigroup, sends out laser, which can be blue laser or red laser or green laser, not specific limit
Fixed specific color.
4 groups of the diffusion sheet 4 for being provided with conical mirror 3 in dissipation spot light path and being placed in after conical mirror, conical mirror 3 and diffusion sheet
It is combined into the core component of dissipation spot.Wherein, conical mirror is used to carry out Energy distribution to incident laser beam to homogenize, and changes laser
Gaussian-shaped beam energy distribution pattern, the laser beam after diffusion sheet is used to homogenize above-mentioned carry out Energy distribution are diffused,
Further function as the degree of divergence for increasing laser beam, enhancing dispersion angle diversification.
Specifically, the laser spot diameter sent out due to laser is about in 60mm or so, to improve the transmission of laser beam
Efficiency and shaping efficiency further include shrink beam component 2 in the dissipation spot light path, for the laser beam of large spot to contract
Beam reduces facula area, so that light beam can reduce luminous energy all by the transmission in subsequent optical component-conical mirror
Loss in transmission process, and improve shaping efficiency of the conical mirror to laser beam.In embodiments of the present invention, shrink beam component
2 between laser 1 and conical mirror 3.In specific implementation, as shown in figure 4, shrink beam component 2 can be a piece of convex lens and
The telescopic system of a piece of concavees lens composition, the laser facula area after telescopic system reduce, and have carried out the contracting of light beam
Beam, so as to easily all be received by next optical mirror slip, that is, conical mirror 3.
In embodiments of the present invention, conical mirror 3 is specifically as follows Conical Lenses, and optical component section is circle, is convenient for
Round or ellipse or rectangular laser facula are received, and processing cost is low.
Wherein, as previously mentioned, according to the optical characteristics of conical mirror 3, when along lens plane to conical surface incident beam be height
When this type light beam, Gaussian laser light beam can be converted to class Bessel type light beam, laser beam is carried out to homogenize shaping.Figure
3A illustrates that the distribution schematic diagram of Gaussian-shaped beam, energy concentrate near optical axis, i.e., the light beam energy of the neighbouring angle of 0 degree and optical axis
Amount accounts for the overwhelming majority of entire laser beam, and energy is more concentrated, and in same light source, the incident angle of light beam is identical,
Phase or constant phase difference, this is the main reason for causing laser spatial coherence strong.Fig. 3 B illustrate laser coherence light source light
The schematic diagram of spot, spot center site color is deep, and optical energy density is big, therefore coherence is also most strong.
When laser beam passes through conical mirror or Conical Lenses, the light beam of Gaussian shaped profile is broken up to form class Bessel type
Light beam, class Bessel type light beam are multiple homocentric pencil of rays rings, and optical path difference and phase difference of the different light beam rings in transmission process are poor
It is anisotropic larger, it has been more than coherence length（Coherence length refers to the maximum light path that there is the light source of certain spectrum width can interfere
Difference）, to reduce the probability interfered between multiple light beam rings to a certain extent.And Conical Lenses is by part
It is broken up by the light beam on conical mirror cone angle vertex, increases the angle of the angle of divergence of light beam, also increase the various of dispersion angle
Property.As laser beam becomes the distribution of class Bessel type light beam ring, Energy distribution also changes therewith, as shown in Figure 5.Wherein,
The longitudinal axis represents the Energy distribution intensity of light beam, and horizontal axis represents the degree of divergence of the dispersion angle or light beam that are formed with 0 degree of optical axis.It is right
Than Fig. 3 A it is found that the beam energy distribution of former Gaussian becomes multi-angle beam energy distribution mode shown in fig. 5.Wherein,
Energy intensity in Fig. 5 near 0 degree or optical axis shared by the light beam of the angle angle of divergence drastically dies down, and ratio is greatly reduced, and
This segment beam incidence angle is identical, and phase or constant phase difference, direction of vibration is identical, is the master for causing laser spatial coherence strong
Reason is wanted, by substantially weakening the energy proportion of this segment beam, can effectively reduce the spatial coherence of laser.Meanwhile scheming
In be also shown the beam energy distribution curve of a plurality of dispersion angle, the light beam of each dispersion angle is shared in entire light beam
Energy proportion increases, and the beam energy of each dispersion angle homogenizes distribution relatively.It is, after conical mirror, due to cone angle
To the disperse function of light beam, the beam energy of angle is distributed and no longer excessively concentrates but broken up, shape near 0 degree or optical axis
At the light beam of more dispersion angles, the phase difference otherness enhancing between multiple scattered angle light beam, the probability interfered drops significantly
It is low, to but also the spatial coherence of entire laser light source dies down.
In embodiments of the present invention, after diffusion sheet 4 is located at conical mirror 3, for the class Bessel type to being emitted through conical mirror 3
Light beam is diffused, and plays the effect of enhancing eliminating coherence.This is because although class Bessel type light beam has multiple homocentric pencils of rays
Ring, the distance between light beam ring have been more than the coherence length of light beam, are unfavorable for interfering between the light beam of each light beam ring, but
It is between the light beam in each light beam ring still within the scope of coherence length, to still have stronger coherence.Therefore, exist
In the present embodiment, diffusion sheet 4 is additionally provided with after conical mirror 3.Preferably, diffusion sheet 4 is the diffusion sheet of movement, can be rotation
Movement, can also be translational motion, since the diffusion sheet of movement can increase the degree of divergence and dispersion angle to laser beam
Random distribution, increase the random space phase of laser beam, compared to the diffusion sheet of fixed setting, dissipation spot is better.
The diffusion sheet of movement needs to drive by driving device, and driving device can utilize the prior art to realize, in this hair
It does not elaborate in bright embodiment.
Diffusion sheet 4 during the motion, plays the role of uniformly spreading, therefore can be to each of class Bessel type light beam
Light beam ring is spread respectively, further increases the angle of divergence of each light beam ring light and the randomness of dispersion angle, by with
Conical mirror 3 breaks up that effect is superimposed, and reaching makes the multifarious purpose of laser beam divergent angle degree to gaussian laser type light beam, and
The diversity of dispersion angle can result in light transmission optical path difference, so-called optical path difference refer to two-beam reach certain point light path it
Difference is the amount for showing interference fringe property.In embodiments of the present invention, two beams of the different dispersion angles that same light source is sent out
Light, in same Propagation, optical path difference can be simply derived by by geometric path difference.For example, 0 degree of light and 5
The light for spending dispersion angle reaches same optical mirror slip（It is regarded as same point）When, the geometric path that 5 degree of light are undergone is more than 0 degree
Light, to have certain optical path difference, according to phase difference=2 π/λ × optical path difference（λ is the wavelength in vacuum, in this implementation
It is laser of the same race in example, λ is identical）, different optical path differences leads to different phase changes, to which phase is identical or difference is permanent
Fixed probability just substantially reduces, and destroys one of condition of interference, and the degree of coherence and laser light source to alleviate laser are answered
The speckle effect of used time.
Simultaneously as the STOCHASTIC DIFFUSION of diffusion sheet, can carry out random redistribution, to class shellfish plug to dispersion angle
The light beam and the light beam near 0 degree of optical axis of the wide-angle angle of divergence in your type distribution are homogenized again, and wide-angle is made to dissipate
The beam energy at angle reduces, and the beam energy near 0 degree of optical axis is suitably enhanced, and improve entire light beam homogenizes journey
Degree.Laser beam energy distribution schematic diagram after diffusion sheet 4 as shown in fig. 6, comparison diagram 5 it is found that both sides dispersion angle
Beam energy decreases, and the beam energy near 0 degree of optical axis is promoted.In practice, it is desirable near optical axis
Light energy it is stronger, convenient for improve light beam by the optical efficiency in each optical mirror slip, be particularly advantageous for rear end x ray machine part
Optical wand collect, due to the restriction of ranges of incidence angles when optical wand collects light beam, for deviateing the diverging of optical axis wide-angle farther out
Light can not be completed to collect because being lost more than ranges of incidence angles.Therefore pass through diffusion sheet in technical solution of the present invention
Homogenization is spread again, by weakening the Energy distribution of high dispersion angle light beam to a certain extent, to reduce into light
Light loss when stick is conducive to improve light-source brightness, by the promotion to beam energy near 0 degree of optical axis, improves light beam and passes through optics
Optical efficiency when eyeglass, while being conducive to improve the brightness of light source indirectly.
After diffusion sheet 4, due to the collective effect of conical mirror and diffusion sheet, at this time the etendue quantitative change of laser beam
Greatly, light beam is in divergent state, is unfavorable for fully entering next optical component, be easy to cause light loss of energy, is needed to being in hair
The laser beam of bulk state is collimated or is assembled, and becomes parallel or less parallel light beam could be utilized again.
Further, the embodiment of the invention also includes collimating components 5, for after conical mirror and diffusion sheet shaping diffusion
Laser beam collimated, form parallel or less parallel light beam to reduce dispersion angle, meet entering for next optical component
Penetrate angle requirement.Specifically, collimating components be a piece of convex lens or two panels convex lens group at convex lens microscope group, can be to hair
Scattered light beam plays the role of collimation or convergence.
In practical application, laser beam can carry out closing light by the processing of dissipation spot enters light guide member, as previously mentioned, logical
Often be optical wand, optical wand have certain incident angle range, dispersion angle be more than the incident angle range light beam will be unable into
Enter optical wand, causes the waste of luminous energy.If therefore collimating components 5 are insufficient to the collimating effect of light beam, multi-disc convex lens can be used
The laser beam of diverging is collimated or is assembled simultaneously, reduces the dispersion angle of light beam, to meet the incidence of light guide member
Angle requirement improves the light collection efficiency of light guide member, to improve the brightness of laser lighting light source.
To sum up, the laser dissipation spot light path that the embodiment of the present invention 1 provides, first with conical mirror swashing Gaussian shaped profile
Light light beam is broken up to form class Bessel type light beam, carries out homogenizing shaping to laser beam, from concentrate on 0 degree of optical axis and nearby diverging
The Energy distribution mode of angle becomes having the relatively homogenized distribution mode of the energy of multiple dispersion angles and each dispersion angle,
It substantially reduces and nearby causes the stronger beam section of laser coherence positioned at 0 degree of optical axis, effectively reduce the sky of laser beam
Between coherence, and the diffusion sheet by being arranged after conical mirror, laser beam after capable of being homogenized to carrying out Energy distribution into
Row further diffusion, so as to which the light beam of the various dispersion angles of class Bessel type light beam is further spread, enhancing diverging
Degree, reaching jointly makes the multifarious purpose of laser beam divergent angle degree, and the diversity of dispersion angle can result in light biography
Defeated light path difference, different optical path differences lead to different phase changes, destroy the condition interfered, therefore alleviate sharp
Speckle effect when degree of coherence and the laser light source application of light, has achieved the purpose that dissipation spot.
The embodiment of the present invention 1 carries out dissipation spot by using the combination of conical mirror and diffusion sheet, can fundamentally change
The characteristics of becoming gaussian laser type Energy distribution, what the laser beam itself so as to relatively effectively eliminate Gaussian shaped profile had
Coherence, the optical component quantity used in light path is few, and optics framework is simple, easy to utilize.
Embodiment 2
In the embodiment of the present invention 2 from embodiment 1 unlike, shrink beam component 2 can also use a piece of big convex lens
Mirror, and the vertex of conical mirror 3 is located at one times of focal position of a piece of convex lens, as shown in Figure 7.
As shown in Figure 1, the cone angle apex of conical mirror to the refraction action of light clearly, the light projected by the vertex
In divergent state.When the vertex of conical mirror 3 is located at one times of focal position of convex lens, more planoconvex lens meeting can be made
Light after poly- is broken up, convenient for for height by the vertex of conical mirror 3 so as to carry out stronger degree to more light beams
The laser beam of this type is changed to class Bessel type beam distribution, is carried out to the beam energy of dispersion angle near 0 degree and optical axis
The degree disperseed and slackened is stronger, and degree enhancing is homogenized to beam energy distribution.Beam energy distribution signal as shown in Figure 8
Figure, the longitudinal axis represent the Energy distribution intensity of light beam, and horizontal axis represents the diverging journey of the dispersion angle or light beam that are formed with 0 degree of optical axis
Degree.Comparison diagram 5 and Fig. 7 it is found that in the figure 7 the high dispersion angle far from optical axis beam energy ratio improve, 0 degree and optical axis it is attached
The beam energy intensity of part dispersion angle further decreases, to same incident angle, same phase, the light of same direction of vibration
Beam energy etc. reduces degree more very compared to embodiment 1, is more conducive to the eliminating coherence or dissipation spot of laser.
It is same as Example 1, in the embodiment of the present invention 2, diffusion sheet 4 is also equipped with behind conical mirror 3, diffusion sheet is excellent
Selection of land is the diffusion sheet of movement, and each light beam ring that can be directed to class Bessel type light beam is further spread, enhancing diverging
The diversity of angle further decreases the spatial coherence of laser beam, and laser coherence and laser light source are reduced to reach
Using when speckle effect purpose.
Embodiment 3
The embodiment of the present invention 3 provides a kind of two-color laser light source, by laser dissipation spot light path application described in embodiment 1
Into two-color laser light source framework.Specifically, as shown in figure 9, two-color laser light source includes blue laser 11 and red laser
Device 12, sends out blue laser and red laser respectively, and blue laser and red laser can be respectively one group or multigroup,
The two can also be arranged vertically setting with arranged in parallel, can consider closing light light path volume, heat dissipation knot in the specific implementation
The complexity of structure is selected；And fluorescent wheel 3, it is set in blue laser emitting light path, including phosphor region（In figure not
It shows）And transmission area（It is not shown in figure）, phosphor region is provided with green emitting phosphor, for being excited generation green glimmering by blue laser
Light, transmission area is for transmiting the blue laser.
For blue laser light path, blue laser 11 sends out blue laser, according to rotation sequential, a part of blue laser
The fluorescent powder area of incident fluorescence wheel 3, excitation fluorescent wheel generate the green light of one of three primary colours, and a part of blue laser is from fluorescent wheel
Transmission area passes through, and generates the blue light of one of three primary colours.
As described in example 1 above, the laser facula area sent out from laser is larger, swashs to fluorescence to improve laser
Efficiency is sent out, and improves efficiency of transmission of the laser in optical component, needs to be focused the laser facula that laser is sent out
It reduces, the hot spot for forming small high-energy density is got on the fluorescent powder of fluorescent wheel 3.Therefore, the indigo plant that blue laser 11 is sent out
Color laser needs to be focused by the first focus lens group 27, forms small laser facula.First focus lens group 27 can be with
Including two panels convex lens, as shown in Figure 9.In this two panels convex lens, the convex lens type close to laser setting is larger, for complete
The hot spot that the reception laser in face is directly sent out, the convex lens type close to fluorescent wheel setting is smaller, for convex through first
Hot spot secondary focusing after lens focus, accelerates the diminution of facula area.And in another kind is implemented, the first condenser lens
Group 27 can also include a telescopic system being made of convex lens and concavees lens and a piece of convex lens, first to laser light
Shu Jinhang shrink beams, then be focused.
In embodiments of the present invention, in order to simplify the combining of blue laser and green fluorescence, optical axis conversion eyeglass is reduced
Use, using transmission-type fluorescent wheel, the fluorescent powder setting of fluorescent wheel 3 on the transparent substrate or by fluorescent powder and inorganic material,
For example fluorescent powder plate body is made in ceramics, mixed sintering, the plate body is transparent, and light can allow for pass through.And on the outside of phosphor powder layer
Equipped with high thoroughly blue anti-green plated film, since the exit direction for the fluorescence being excited is along all directions, when part-green fluorescence
Along when being emitted towards fluorescent wheel front, blue anti-green plated film can be such that green fluorescence is reflected and along blue laser incidence to the height thoroughly
Direction from the fluorescent wheel back side be emitted, to, fluorescent wheel 3 can be sequentially output blue laser in rotary course according to sequential
And green fluorescence.
Compared to reflection-type fluorescent wheel, the circuit design of blue laser is omitted, circuit design generally includes condenser lens,
Plane mirror etc., therefore save the usage quantity and type of optical mirror slip.
Due to through fluorescent wheel 3 outgoing after blue laser and green fluorescence dispersion angle it is larger, also set at 3 back side of fluorescent wheel
It is equipped with collimation lens set 28, carries out being collimated into parallel or less parallel light beam for blue laser and the green fluorescence to diverging defeated
Go out.Collimation lens set 28 generally includes two panels convex lens, can also be a piece of hypersphere lens.
Collimated blue laser and green fluorescence reach closing light component 4, and closing light is carried out with red laser.
For red laser light path, blue is swashed since human eye is more than the speckle effect sensitivity that red laser generates
Light, in embodiments of the present invention, it is provided with dissipation spot light path specifically for red laser light path, for dissipating to red laser
Spot processing, mitigates the influence deteriorated for entire two-color laser light source speckle due to the use of red laser.
Specifically, can refer in embodiment 1 dissipation spot light path setting, red laser successively after shrink beam component 21 successively
Incident conical mirror 23 and diffusion sheet 24, wherein the core component of conical mirror 23 and diffusion sheet 24 as dissipation spot passes through conical mirror
Shaping operation is homogenized to red laser Gaussian shaped profile, becomes the distribution of class Bessel type, multiple light beam rings is formed, to original phase
The light beam of integrated distribution is broken up, substantially reduces and nearby causes the stronger light beam of laser coherence positioned at 0 degree of optical axis
Part effectively reduces the spatial coherence of laser beam, and the distance between each light beam ring after breaing up increases, and has been more than phase
Dry length, thus the coherence between light beam ring is reduced, and the diffusion of the diffusion sheet through movement, inside light beam ring
Light carries out the random distribution of further diffusion and dispersion angle, and light beam is reduced by way of increasing space random phase
The probability of interference, so as to play the role of dissipation spot to red laser.
In the present invention is embodied, the dissipation spot light channel structure of red laser can also use embodiment 2 to be provided
Optics framework, i.e. red laser pass through a piece of convex lens successively, and the conical mirror at one times of focal position of convex lens is arranged, and
Diffusion sheet after conical mirror, conical mirror and diffusion sheet are identical as using optics framework role in embodiment 1, herein no longer
It repeats, unlike, conical mirror is set to one times of focal position of convex lens, and more light can be made to pass through conical mirror cone angle
Vertex diverging is projected, it is also possible to causing the luminous energy that conical mirror is born more, to which temperature is higher, needs dissipating for raising system
Hot property.
Red laser also passes through the second condenser lens 25 after dissipation spot, to the light beam that is dissipated after diffusion sheet 24 into
Row collimation can not cause luminous energy otherwise since the beam optical propagation of diffusion diverging becomes larger completely into next optical component
Loss in transmission process.
Collimated red laser also reaches closing light component 4, and closing light is carried out with blue laser and green fluorescence.
In embodiments of the present invention, closing light component 4 is specially that a piece of dichroscope is transmissive to feux rouges simultaneously by plated film
Reflect blue light and green light.
Red laser, blue laser and green fluorescence reach light guide member 5 after closing light, light collection are carried out, to be throwing
Shadow equipment ray machine provides illumination.Light guide member is usually optical wand.A part of the optical wand as ray machine is used for light source part sequential
The dmd chip that the three primary colours light of output is conducted to ray machine is modulated, and is projected to and formed image on screen.Since optical wand has
Certain incident angle range, dispersion angle are more than that the light beam of the incident angle range will be unable to enter optical wand, cause luminous energy
Waste, therefore three primary colours light usually also passes through condenser lens before reaching light guide member, to reduce dispersion angle.
In embodiments of the present invention, tertiary focusing lens 26 are provided with for being focused to three primary colours closing light, are made more
Light beam disclosure satisfy that the incident angle range of light guide member 5, improve light-source brightness.
In embodiments of the present invention, red laser 12 and blue laser 11 are to be set up in parallel, and before combining, are needed
Optical axis direction conversion is carried out to one of light path, to enable blue laser and red laser with orthogonal optical axis side
To by a piece of dichroscope, to transmit all the way, the mode reflected all the way carries out closing light.Therefore it is arranged in red laser light path
Speculum 22, speculum 22 can be plane mirror.If red laser 12 and blue laser 11 are to be vertically arranged,
Then two-way laser propagation direction is mutually perpendicular to, then need not carry out the conversion of optical axis direction, it is convenient to omit reflection mirror component makes
With.
Since human eye is more sensitive compared to blue laser for the speckle effect of red laser, swash double-colored
It is just more necessary for the speckle issue that disappears of red laser in radiant.In embodiments of the present invention, by red laser
Conical mirror and diffusion chip part, the dissipation spot process as described in embodiment 1 or embodiment 2, first with cone are set in light path
Shape mirror is changed the regularity of distribution of the red laser light beam of Gaussian, and light beam is carried out to homogenize shaping, will original energy quantity set
In distribution mode become to have certain dispersion angle and each relatively homogenized distribution mode of dispersion angle energy, substantially weaken
It is located at 0 degree optical axis and nearby causes laser coherence stronger beam section, and utilizes the diffusion of diffusion sheet, further increasing
The degree of divergence and dispersion angle random distribution for adding each light beam, by breaing up effect phase to gaussian laser type light beam with conical mirror
Superposition, may ultimately reach makes the multifarious purpose of beam divergence angle, and the diversity of dispersion angle can result in light transmission
Optical path difference, different optical path differences lead to different phase changes, to which phase is identical or the probability of phase difference constant just drops significantly
It is low, one of condition of interference is destroyed, to further mitigate the coherence of red laser, and then mitigates red laser light source
With speckle effect when two-color laser light source applications.
In compared with the prior art, using the scheme of random phase device or optical fiber dissipation spot, the embodiment of the present invention provides
Laser dissipation spot light path carry out dissipation spot using the combination of conical mirror and diffusion sheet, pass through change laser beam energy point
Cloth rule increases the diversity of beam divergence angle to destroy coherent condition, can fundamentally change the distribution of gaussian laser type
The coherence itself brought effectively reduces the spatial coherence of laser beam.And used optical component quantity is few,
And it is small shared by optical component, optics framework is simple, easy to utilize.
Meanwhile two-color laser light source framework provided in an embodiment of the present invention, to increasing dissipation spot in red laser light path
Component has carried out dissipation spot before closing light, to blue laser and green fluorescence, by using a transmission-type fluorescence wheel component
Realization exports in the same direction, and three reaches same closing light component and carries out closing light output, forms three primary colours.The light source framework both solved
It has determined the speckle effect problem of red laser, the laser lighting light source of high quality can be provided, while also using less optics
Component realizes combining and the closing light of three primary colours, and light source framework is simple, small, is convenient for the miniaturization of laser equipment.
Embodiment 4
The embodiment of the present invention 4 from embodiment 3 unlike, fluorescent wheel 3 be reflective fluorescent wheel, as shown in Figure 10, instead
The formula fluorescent wheel of penetrating is excited reflex direction with blue laser incident direction opposite direction of the fluorescence generated by aluminum substrate
It projects, closing light component 4 is placed in before fluorescent wheel 3.
In order to which the fluorescence of blue laser and reflection to transmission collimates, need the front and back in fluorescent wheel 3 equal
It is provided with collimation lens set 28.Wherein blue laser will also pass through after the collimation lens set 28 at the fluorescent wheel back side and relay back
Road, including the components such as relay lens and plane mirror, optical component 25 as shown in Figure 10 are back to closing light component 4.Closing light
Component 4 is a dichroscope, by plated film, realizes blue thoroughly red anti-green selection index system thoroughly.Therefore, it is possible to allow blue laser first
Fluorescence wheel surface is transmitted and is irradiated to, excitation green emitting phosphor sends out green fluorescence, and minute surface of the green fluorescence through non-fluorescence area is anti-
It penetrates, reaches closing light component 4 along the direction opposite with blue laser incidence, reflected away through dichroscope.
For red laser light path, the dissipation spot light path disclosed in embodiment 1 or embodiment 2 similarly may be used, pass through
After dissipation spot light path, red laser reaches closing light component 4, and reaching condenser lens by the transmission effect of closing light component 4 is sent out
Dissipate the diminution at angle.
In embodiments of the present invention, the dissipation spot light path mechanism of red laser is also with embodiment 1 or embodiment 2,
Identical content repeats no more again.
And unlike transmission-type fluorescent wheel, although reflective fluorescent wheel needs to carry out circuit for blue laser
Design, but the conversion effect of fluorescence is relatively high, this is because during transmission-type fluorescent wheel is due to fluorescence excitation at present, heat
Amount builds up detail, and radiating efficiency affects the transfer efficiency of fluorescence.
The above embodiment, those skilled in the art can be selected according to the heat dissipation of light-source system, Structural Design Requirement
It selects.
Embodiment 5
The embodiment of the present invention 5 provides a kind of specifically three color laser light source framework, can be based on institute in embodiment 1 or 2
The dissipation spot light path stated carries out dissipation spot.
Below for being based on embodiment 1, it is proposed that a kind of exemplary three colors laser light source structural schematic diagram, such as Figure 11 institutes
Show, tri-color laser 11,12,13 sends out red, blue and green laser respectively, wherein tri-color laser passes through two panels respectively
Dichroic piece 21,22 carries out closing light, and a kind of light combination mode is only provided in this example, can also use other closing lights such as closing light mirror member
Part, not limit and this.
Dichroic piece 21 realizes that red laser transmission, blue laser reflection and dichroic piece 22 pass through plating by plated film
Film realizes the transmission of red laser and blue laser, the reflection of green laser, to pass through the light combination process of two panels dichroic piece
The laser of three tunnel colors is formed into output light all the way.
Output light all the way after the closing light is first by shrink beam component 23, can be by a piece of convex lens and one specifically
The telescopic system of piece concavees lens composition, carries out the diminution of beam area, so that hot spot can all pass through subsequent conical mirror 3
Component improves optical treatment efficiency.
The closing light of three color laser carries out dissipation spot, mechanism and embodiment 1 by conical mirror 3 and the combination of diffusion sheet 4
It is identical.Details are not described herein.
And other optical components after diffusion sheet are not shown in figure in the exemplary light-source structure of the present invention, such as
Component is assembled, it is larger for the light dispersion angle after being spread through diffusion sheet and be unsatisfactory for entering for rear end light collecting part-optical wand
It is added when firing angle is spent.If laser light beam of light combination dispersion angle meets optical wand incident angle requirement, meeting can not be added
Poly- component, such as convex lens or convex lens group, are directly entered optical wand.
It should be noted that the speckle issue of three color laser is even more serious compared to one-wavelength laser or two-color laser light source,
Therefore it is changed using the regularity of distribution of conical mirror pairing ray laser light beam in the embodiment of the present invention, Gaussian-shaped beam is carried out
Shaping is homogenized, becomes to have certain dispersion angle and each dispersion angle energy relatively even the distribution mode that original energy is concentrated
The distribution mode of change substantially reduces and nearby causes the stronger beam section of laser coherence positioned at 0 degree of optical axis, and utilizes diffusion
The diffusion of piece further increases the degree of divergence and dispersion angle random distribution of each laser light beam of light combination, by with taper
Mirror breaks up that effect is superimposed, and may ultimately reach makes the multifarious purpose of beam divergence angle to gaussian laser type light beam, diverging
The diversity of angle can result in the optical path difference of light transmission, and different optical path differences leads to different phase changes, destroys interference
Condition, to further mitigate the coherence of laser light source, said program imitates the speckle that three color laser light sources are applied
Should have and improve significantly.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God 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 (15)
1. a kind of laser dissipation spot light path, including laser, send out laser, which is characterized in that in the dissipation spot light path at least
It is provided with conical mirror, and is placed in the diffusion sheet after conical mirror,
The laser is transmitted through the conical mirror and diffusion sheet successively,
Wherein, the conical mirror is used to the laser beam break up homogenizing shaping,
The diffusion sheet is used to be diffused the laser beam homogenized after shaping.
2. dissipation spot light path according to claim 1, which is characterized in that the conical mirror is Conical Lenses.
3. dissipation spot light path according to claim 1 or 2, which is characterized in that the diffusion sheet does rotation or translation fortune
It is dynamic.
4. dissipation spot light path according to claim 1, which is characterized in that the dissipation spot light path further includes shrink beam component,
For the laser beam to be carried out the incident conical mirror after shrink beam.
5. dissipation spot light path according to claim 1, which is characterized in that the dissipation spot light path further includes collimating components,
Collimated light beam is formed for the light beam dissipated after diffusion to be carried out collimation.
6. dissipation spot light path according to claim 4, which is characterized in that the shrink beam component include by a piece of convex lens and
The telescopic system of a piece of concavees lens composition.
7. dissipation spot light path according to claim 5, which is characterized in that the collimating components include convex lens or convex lens
Mirror microscope group.
8. a kind of two-color laser light source, including blue laser and red laser, send out blue laser and red laser respectively；
Fluorescent wheel is set in blue laser emitting light path, including phosphor region and transmission area, and the phosphor region is provided with green fluorescence
Powder generates green fluorescence for being excited by the blue laser, and for transmiting the blue laser, feature exists the transmission area
In,
The fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and the blue laser and green fluorescence are collimated
Closing light component is reached after lens group；
The red laser reaches the closing light component after dissipation spot light path, at least provided with taper in the dissipation spot light path
Mirror, and it is placed in the diffusion sheet after conical mirror,
Wherein, the conical mirror is used to homogenize red laser light beam progress Energy distribution, and the diffusion sheet is used for institute
The red laser light beam after Energy distribution homogenizes is stated to be diffused；
The blue laser, green fluorescence and red laser export after closing light to light guide member.
9. laser light source according to claim 8, which is characterized in that the conical mirror is Conical Lenses.
10. laser light source according to claim 8 or claim 9, which is characterized in that the diffusion sheet does rotation or translation fortune
It is dynamic.
11. laser light source according to claim 8, which is characterized in that the closing light component is dichroscope.
12. laser light source according to claim 8, which is characterized in that the dissipation spot light path further includes shrink beam component, is used
The incident conical mirror after the red laser light beam to be carried out to shrink beam.
13. laser light source according to claim 8, which is characterized in that the dissipation spot light path further includes collimating components, is used
The red laser light beam dissipated after by diffusion carries out collimation and forms collimated light beam.
14. laser light source according to claim 11, which is characterized in that the blue laser, green fluorescence and red swash
Light exported after closing light to before light guide member also by assembling component, the angle of flare for reducing light beam after the closing light.
15. a kind of three color laser light sources, including tri-color laser, send out three color laser of red, green, blue, which is characterized in that institute respectively
Tri-color laser is stated after closing light, dissipation spot is carried out through claim 1-7 any one of them laser dissipation spot light paths.
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| CN201510643217.9A CN106569378B (en) | 2015-10-08 | 2015-10-08 | A kind of laser dissipation spot light path and two-color laser light source, three color laser light sources |
| PCT/CN2016/075911 WO2017059656A1 (en) | 2015-10-08 | 2016-03-09 | Laser dispersed spot optical path |
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| CN108919595B (en) * | 2018-06-19 | 2021-04-30 | 青岛海信激光显示股份有限公司 | Three-color laser light source and laser projection television |
| CN109270704B (en) * | 2018-11-21 | 2020-10-23 | 四川长虹电器股份有限公司 | Dynamic light source system for laser speckle elimination |
| CN110031979A (en) * | 2019-05-21 | 2019-07-19 | 中国工程物理研究院流体物理研究所 | Light spot homogenizing expands method and device |
| CN112255871B (en) | 2019-07-02 | 2023-08-04 | 深圳光峰科技股份有限公司 | Light source device, projection apparatus and 3D apparatus including the same |
| CN110673431A (en) * | 2019-10-18 | 2020-01-10 | 成都航天科工微电子系统研究院有限公司 | Light path system of high lumen light engine |
| CN110632817A (en) * | 2019-10-21 | 2019-12-31 | 山西傲维光视光电科技有限公司 | Laser light source system capable of adjusting speckle contrast |
| CN111203651B (en) * | 2020-01-15 | 2021-06-22 | 北京理工大学 | Method for processing and calculating hologram in transparent material by space shaping femtosecond laser |
| CN113960866B (en) * | 2020-07-21 | 2023-08-08 | 青岛海信激光显示股份有限公司 | Laser light source and laser projection device |
| CN112731750B (en) * | 2020-12-31 | 2022-11-04 | 杭州中科极光科技有限公司 | Laser light source and laser display system |
| CN114721161B (en) * | 2021-01-05 | 2024-04-05 | 台达电子工业股份有限公司 | Laser spot eliminating device and operation method thereof |
| CN115388348A (en) * | 2021-05-19 | 2022-11-25 | 深圳市绎立锐光科技开发有限公司 | Lighting device |
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| CN106569378A (en) | 2017-04-19 |
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