CN106569379A - Laser speckle-removing optical path, double-color laser light source, and three-color laser light source - Google Patents
Laser speckle-removing optical path, double-color laser light source, and three-color laser light source Download PDFInfo
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- CN106569379A CN106569379A CN201510643398.5A CN201510643398A CN106569379A CN 106569379 A CN106569379 A CN 106569379A CN 201510643398 A CN201510643398 A CN 201510643398A CN 106569379 A CN106569379 A CN 106569379A
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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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
Abstract
The invention discloses a laser speckle-removing optical path which can performs uniform shaping on a Gaussian laser beam by successively arranging a first taper mirror, a diffuser and a second taper mirror in a laser output optical path. In combination with the diffusion effect of the diffuser, the diversity of laser beam divergence angles is formed. The second taper mirror is used for collecting the divergent laser beam so as to ultimately form a light beam uniform distribution way of respective divergence angles near a 0-degree optical axis. The diversity of laser beam divergence angles may reduce the spatial coherence of the laser. Further, the uniform distribution of 0 degree and each divergence angle can prevent a case that the energy of a large-angle divergent beam is over high and thus causes light loss when the divergent beam enters a light collecting part, thereby being beneficial to improvement in the brightness of a laser light source. The technical scheme can take account of the laser speckle removing and the brightness enhancement of the laser light source. The present invention is applied to the 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 Sources.
Background technology
Laser is a kind of high brightness, and high directivity sends the light source of monochromatic coherent light beam, due to the plurality of advantages of laser, in recent years by gradually as light source applications in projection display technique field.The high coherence of laser brings speckle effect when laser projection shows, so-called speckle refers to coherent source when coarse object is irradiated, light after scattering, due to its wavelength it is identical, phase-constant, interference will in space be produced, some parts interfere mutually long in space, there is part to interfere cancellation, final result is that occur granular light and dark spot on screen, these unfocused spots are in flicker state in human eye, long-time viewing is also easy to produce dizziness sense of discomfort, more cause the deterioration of projected image quality, reduce the viewing experience of user.
In the LASER Light Source of practical application, LASER Light Source species is more, and speckle effect is also more serious.For the two-color laser light source of red blue laser constitution, human eye is higher than that, for blue laser, therefore the dissipation spot light path design of red laser light source is just particularly important for the sensitivity of red laser speckle effect.
There are various Speckles Techniques that disappear in prior art.A kind of technology is the display screen using vibration, by the vibration of screen weakening integral action of the speckle spot in human eye, but it is for large scale screen control and impracticable, and project at present also towards developing without screenization direction；A kind of technology is to utilize multimode fibre, the length between adjacent fiber is made more than the coherence length of light source, so as to reduce coherence, but the volume of optical fiber is big, light propagation path in a fiber is long, and luminous energy loss is also larger, does not apply to the LASER Light Source design of current miniaturization and highlighted requirement.And, also dissipation spot is carried out by arranging the diffusion sheet or diffusion sheet of motion in laser optical path in prior art, but effect is limited.
The content of the invention
The invention provides a kind of laser dissipation spot light path and two-color laser light source, three color LASER Light Sources, it is possible to increase the dissipation spot effect of laser, speckle effect during Multi Colour Lasers light source applications is solved the problems, such as.
The present invention is achieved by the following technical solutions：
Present invention firstly provides a kind of laser dissipation spot light path, including laser instrument, laser is sent, also include the first conical mirror set gradually along laser output light path, diffusion sheet, and the second conical mirror；
Wherein, the first conical mirror is used to carry out homogenizing shaping to laser beam, and diffusion sheet is used to be diffused the laser beam Jing after the first conical mirror homogenizes shaping, and the second conical mirror is used to being collected the laser beam after diffusion and secondary homogenizes.
Further, the first conical mirror, the second conical mirror are Conical Lenses.
Further, diffusion sheet does and rotates or translational motion.
Further, dissipation spot light path also includes shrink beam part, for laser beam to be carried out into incident first conical mirror after shrink beam.
Further, shrink beam part includes the telescopic system being made up of a piece of convex lens and a piece of concavees lens.
Further, the first conical mirror is oppositely arranged with the second conical mirror.
Present invention also offers a kind of two-color laser light source, including blue laser and red laser, blue laser and red laser are sent respectively；Fluorescent wheel, in being arranged at blue laser emitting light path, including phosphor region and transmission area, the phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, transmission area to be used to transmit the blue laser by blue laser,
Wherein, fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and closing light part is reached after blue laser and the collimated lens group of green fluorescence；
And, red laser reaches closing light part Jing after dissipation spot light path, at least provided with the first conical mirror in the dissipation spot light path, diffusion sheet, and second conical mirror, wherein, the first conical mirror is used to that laser beam to be carried out to homogenize shaping, diffusion sheet is used to be diffused the laser beam Jing after the first conical mirror homogenizes shaping, and the second conical mirror is used to be collected the laser beam after diffusion and secondary homogenize；
Export to light guide member after blue laser, green fluorescence and red laser ECDC light.
Further, the first conical mirror, the second conical mirror are Conical Lenses.
Further, diffusion sheet does and rotates or translational motion.
Further, closing light part is dichroscope.
Further, dissipation spot light path also includes shrink beam part, for the red laser light beam to be carried out into incident first conical mirror after shrink beam.
Further, the first conical mirror is oppositely arranged with second conical mirror.
Further, export to before light guide member after blue laser, green fluorescence and red laser ECDC light also through convergence part, for reducing the closing light after light beam the angle of divergence.
And, technical solution of the present invention additionally provides a kind of three colors LASER Light Source, including tri-color laser, sends three kinds of laser of red, green, blue, and above-mentioned three kinds of laser carries out dissipation spot after closing light through the laser dissipation spot light path of such scheme.
Technical solution of the present invention, at least with following Advantageous Effects or advantage：
The laser dissipation spot light path that technical solution of the present invention is provided, by arranging the first conical mirror in laser optical path, using conical mirror optical characteristics, the laser beam of Gaussian shaped profile can be broken up to form class Bessel type light beam, laser beam is carried out to homogenize shaping, change Gaussian-shaped beam energy and concentrate on 0 degree or the distribution mode near optical axis, 0 degree and the laser beam energy near optical axis are significantly weakened, and this segment beam angle is identical, phase place or constant phase difference, it is the main cause for causing laser spatial coherence strong, with tailing off for this segment beam, the spatial coherence degree of laser beam also weakens therewith, formed simultaneously and there is the relatively homogenized distribution of the energy of multiple dispersion angles and each dispersion angle, and the Energy distribution of whole laser beam is based on the beam energy of multiple dispersion angles.
And by being arranged on the first conical mirror after diffusion sheet, can to homogenizing after laser beam further spread, the light beam of the various dispersion angles of class Bessel type light beam can further be spread, increase the randomness of dispersion angle, strengthen degree of divergence, on the one hand the diversity of laser beam divergent angle degree can be collectively forming in combination with the effect of breaing up of first conical mirror to laser beam, and the diversity of dispersion angle can result in the light path difference of light transmission, different optical path differences causes different phase place changes, so as to phase place is identical or probability of phase difference constant is just substantially reduced, destroy one of condition for interfering, and then reduce laser beam degree of coherence and with speckle effect during LASER Light Source application.On the other hand, diffusion sheet is acted on the random distribution of dispersion angle, serves certain differentiation reduction for carrying out homogenized effect to each dispersion angle distribution, making the beam energy profiles versus of high dispersion angle and 0 degree.
And by arranging the second conical mirror, laser beam after diffusion is collected and secondary is homogenized, nearby the light beam of angle and the energy of the light beam with each dispersion angle are evenly distributed state to make to be distributed in 0 degree and optical axis, improve the uniform distribution of forces of whole laser beam light beam in all angles.On the one hand, there are multiple dispersion angles through secondary homogenized laser beam, the diversity principle of dispersion angle can be utilized to carry out dissipation spot, simultaneously, compared to the beam distribution of each angle after the first conical mirror, the energy proportion that will be distributed over 0 degree and the light beam near optical axis is lifted, beneficial to light treatment effeciency of raising laser beam when through optics, light loss when enabling in particular to prevent the energy proportion of wide-angle divergent beams too high and causing entry into light collecting part, so as to improve the brightness of LASER Light Source.
To sum up, the laser dissipation spot light path that technical solution of the present invention is provided carries out dissipation spot by using the combination of two panels conical mirror and diffusion sheet, the characteristics of gaussian laser type Energy distribution can fundamentally be changed, both the dispersion angle of laser beam had been increased, 0 degree and optical axis are nearby homogenized with the Energy distribution of the light beam of high dispersion angle again, the dissipation spot effect of laser and the luminance raising of LASER Light Source can be taken into account, with higher practical value.
Technical solution of the present invention additionally provides a kind of two-color laser light source, including blue laser light source and red laser light source, by carrying out dissipation spot using above-mentioned dissipation spot light path to red laser, red laser is enable the characteristics of the collective effect of two panels conical mirror and diffusion sheet fundamentally changes gaussian laser type Energy distribution, both the dispersion angle of laser beam had been increased, 0 degree and optical axis are nearby homogenized with the Energy distribution of the light beam of high dispersion angle again, dissipation spot can either be carried out to red laser light beam while also reducing the light loss in the communication process that may be brought due to the increase of the light beam ratio of the wide-angle angle of divergence, advantageously ensure that the brightness of red laser.Due to human eye it is more sensitive to the speckle effect of red laser, the speckle effect when degree of coherence for reducing red laser also just alleviates two-color laser light source applications, so as to reach the purpose to two-color laser light source dissipation spot, the light loss of red laser is reduced simultaneously, is also beneficial to lift the brightness of two-color laser light source.
And, in technical solution of the present invention, green fluorescence is inspired after blue laser incident fluorescence wheel, green fluorescence and blue laser are sequentially output by a fluorescence wheel component according to sequential, again closing light is carried out by a closing light part with the red laser Jing after dissipation spot, blue laser and green fluorescence, dissipation spot light path and combining and closing light part are few, and optics framework is succinct, and can provide the laser lighting light source of low speckle, high brightness.
The three color lasers that technical solution of the present invention is provided, light beam all the way is formed after the three colors LASER Light Source ECDC light, and the laser dissipation spot light path of the above-mentioned two panels conical mirrors of Jing and diffusion sheet composition, the mechanism of dissipation spot is combined with reference to above-mentioned conical mirror and diffusion sheet, the three color LASER Light Sources that technical solution of the present invention is provided can either effectively dissipate spot, the luminance loss of LASER Light Source can also be reduced, so as to provide the laser lighting light source of low speckle, high brightness.
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 is provided
Fig. 5 is the Laser beam energy distribution schematic diagram in the embodiment of the present invention 1 after the first conical mirror；
Fig. 6 is the Laser beam energy distribution schematic diagram in the embodiment of the present invention 1 after diffusion sheet；
Fig. 7 is the Laser beam energy distribution schematic diagram in the embodiment of the present invention 1 after the second conical mirror；
Fig. 8 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 2 is provided；
Fig. 9 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 3 is provided；
Figure 10 is the three color LASER Light Source structural representations that the embodiment of the present invention 4 is provided.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Before the specific embodiment of the invention is introduced, the optical characteristics of conical mirror is introduced first, conical mirror has a conical surface and a plane, and wherein light is incident from plane side, and can be used to produce can increase diameter but be consistent the non-diffraction annular beam of annular thickness with distance.As shown in figure 1, when parallel beam incident is to conical mirror plane side, effect of the refraction with focus convergence of the Jing conical surfaces, but the light through the E outgoing of conical surface summit dissipates to multiple directions, so as to beam energy be disperseed.Due to the optical effect that simultaneously there is convergence and diverging to light beam, the diamond crossing area of a light beam can be formed in the exit direction of conical mirror, dash area as shown in Figure 1, when in this region, when carrying out imaging than X/Y plane as shown in FIG. 1, it is observed that concentric multiple annular beams, as schematically shown in Figure 2.Wherein, the light beam positioned at internal layer or the beam energy near light beam ring center are weaker in multiple concentric annular light beams, and the light beam ring energy positioned at outer layer is stronger, illustrates the contrast situation of light beam ring energy intensity in figure with the shade of light beam ring.
Embodiment 1
The embodiment of the present invention 1 provides a kind of laser dissipation spot light path, as shown in figure 4, can be one or more groups of including laser instrument 1, sends laser, and the laser instrument can be blue laser or red laser or green laser, specifically not limit concrete color.
The first conical mirror 3, diffusion sheet 4, and the second conical mirror 5 are disposed with dissipation spot light path along laser emitting light path.Wherein, the first conical mirror 3 is used to that laser beam to be carried out to homogenize shaping, and diffusion sheet 4 is used to be diffused the laser beam Jing after the first conical mirror homogenizes shaping, and the second conical mirror is used to being collected the laser beam after diffusion and secondary homogenizes.
Specifically, the laser spot diameter sent due to laser instrument is about in 60mm or so, to improve the efficiency of transmission and shaping efficiency of laser beam, also include shrink beam part 2 in the dissipation spot light path, for the laser beam of large spot to be carried out into shrink beam, reduce facula area, so that light beam can all by the transmission in follow-up optics-conical mirror, loss of the luminous energy in transmitting procedure is reduced, and improves shaping efficiency of the conical mirror to laser beam.In embodiments of the present invention, shrink beam part 2 is located between laser instrument 1 and conical mirror 3.In being embodied as, as shown in figure 4, shrink beam part 2 can be the telescopic system of a piece of convex lens and a piece of concavees lens composition, the laser facula area after telescopic system reduces, the shrink beam of light beam is carried out such that it is able to be easily that conical mirror 3 is all received by next optical mirror slip.
In embodiments of the present invention, the first conical mirror 3 and the second conical mirror 5 can specifically be Conical Lenses, and its optics section is circle, be easy to receive circular oval or square laser facula, and processing cost is low.
In embodiment of the present invention scheme, because the effect of the first conical mirror and the second conical mirror is different, specifically, the first conical mirror is to break up laser beam, and the second conical mirror is that the light beam to dissipating is collected, therefore the first conical mirror and the second conical mirror are oppositely arranged.And, for the first conical mirror and the second conical mirror type selecting and be not specifically limited, can facet type greatly it is identical, it is also possible to it is different, depending on the shaping degree difference in light path to light beam.
As it was previously stated, according to the optical characteristics of conical mirror, when along lens plane to conical surface incident beam be Gaussian-shaped beam when, Gaussian laser light beam can be converted into class Bessel type light beam, the Energy distribution of laser beam is homogenized.Fig. 3 A illustrate the distribution schematic diagram of Gaussian-shaped beam, energy is concentrated near optical axis, the beam energy of the neighbouring angle of i.e. 0 degree and optical axis accounts for the overwhelming majority of whole laser beam, energy is more concentrated, and in same light source, the incident angle of light beam is identical, phase place or constant phase difference, and this is the main cause for causing laser spatial coherence strong.Fig. 3 B illustrate the schematic diagram of laser coherence light source hot spot, and spot center site color depth, optical energy density is big, therefore coherence is also most strong.
When laser beam is through the first conical mirror, the light beam of Gaussian shaped profile is broken up to form class Bessel type light beam, class Bessel type light beam is multiple homocentric pencil of rays rings, and optical path difference and phase difference otherness of the different light beam rings in transmitting procedure is larger, has exceeded coherence length（Coherence length refers to the maximum optical path difference that the light source with certain spectrum width can be interfered）, so as to reduce the probability for interfering between multiple smooth beam rings to a certain extent.And, Conical Lenses breaks up part by the light beam on conical mirror cone angle summit, increases the angle of the angle of divergence of light beam, also increases the diversity of dispersion angle.As laser beam becomes the distribution of class Bessel type light beam ring, its Energy distribution also changes therewith, as shown in Figure 5.Wherein, the longitudinal axis represents the Energy distribution intensity of light beam, and transverse axis represents the degree of divergence of the dispersion angle or light beam formed with 0 degree of optical axis.Comparison diagram 3A understands that the beam energy distribution of former Gaussian becomes 0 degree and the relatively homogenized Energy distribution of multi-angle light beam shown in Fig. 5, and the Energy distribution of whole laser beam is based on the beam energy of multiple dispersion angles,.And, energy intensity in Fig. 5 near 0 degree or optical axis shared by the light beam at angular dispersed angle dies down, ratio is reduced, occur in that the beam energy distribution curve of multiple dispersion angles, the shared energy proportion in whole light beam of the light beam of each dispersion angle increases, and the beam energy of each dispersion angle homogenizes distribution relatively.Namely, after the first conical mirror 3, due to disperse function of the cone angle to light beam, the beam energy distribution of angle near 0 degree or optical axis is no longer excessively concentrated, but the energy of the segment beam is significantly slackened, energy proportion is drastically reduced, and this segment beam angle is identical, phase place or constant phase difference, it is the main cause for causing laser spatial coherence strong, with tailing off for this segment beam, the spatial coherence degree of laser beam also weakens therewith, the light beam of many dispersion angles is formed simultaneously, and dissipate the enhancing of the phase difference otherness between angular light beam more, the probability for interfering is substantially reduced, so as to the spatial coherence of whole LASER Light Source dies down.
In embodiments of the present invention, diffusion sheet 4 is located at after the first conical mirror 3, and for being diffused to the class Bessel type light beam of the outgoing of Jing conical mirrors 3, can play strengthens the effect of eliminating coherence.This is because, although class Bessel type light beam has multiple homocentric pencil of rays rings, the distance between light beam ring has exceeded the coherence length of light beam, it is unfavorable for being interfered between the light beam of each light beam ring, but between the light beam in each light beam ring still within the scope of coherence length, so as to still have stronger coherence.Therefore, in the present embodiment, it is additionally provided with diffusion sheet 4 after the first conical mirror 3.Preferably, diffusion sheet 4 is the diffusion sheet of motion, it can be rotary motion, it can also be translational motion, because the diffusion sheet for moving can increase the random distribution of the degree of divergence to laser beam and dispersion angle, increase the random space phase of laser beam, compared to the diffusion sheet being fixedly installed, dissipation spot is better.
The diffusion sheet of motion needs to be driven by driving means, and driving means can be realized using prior art, do not elaborated in embodiments of the present invention.
Diffusion sheet 4 is in motion process, play a part of uniform diffusion, therefore, it is possible to be spread respectively to each light beam ring of class Bessel type light beam, further increase the angle of divergence of each light beam ring light and the randomness of dispersion angle, by with the first conical mirror 3 to gaussian laser type light beam to break up effect superimposed, increased the dispersion angle of laser beam, and form multiple dispersion angles, and the diversity of dispersion angle can result in the optical path difference of light transmission, so-called optical path difference refers to that two-beam reaches the difference of the light path of certain point, is the amount for showing interference fringe property.In embodiments of the present invention, the two-beam of the different dispersion angles that same light source sends, in same Propagation, its optical path difference simply can be derived by by geometric path difference.For example, the light of 0 degree of light and 5 degree of dispersion angles reaches same optical mirror slip（It is regarded as same point）When, the geometric path that 5 degree of light is experienced more than 0 degree of light, so as to have certain optical path difference, according to phase difference=2 π/λ × optical path difference（λ is the wavelength in vacuum, is laser of the same race in the present embodiment, and λ is identical）, different optical path differences causes different phase place changes, so as to phase place is identical or probability of phase difference constant is just substantially reduced, one of condition of interference is destroyed, so as to the speckle effect when degree of coherence and the LASER Light Source application that alleviate laser.
Meanwhile, diffusion sheet 4 is acted on the random distribution of dispersion angle, serves certain differentiation reduction for carrying out homogenized effect to each dispersion angle distribution, making the beam energy profiles versus of high dispersion angle and 0 degree.Laser beam energy distribution schematic diagram after diffusion sheet 4 as shown in Figure 6, contrast Fig. 5 understands that the beam energy of both sides dispersion angle decreases, and the beam energy near 0 degree of optical axis has been lifted.In practical application, expect that the light energy near optical axis is stronger, it is easy to improve optical efficiency of the light beam in by each optical mirror slip, the optical wand for being particularly advantageous for rear end x ray machine part is collected, the restriction of ranges of incidence angles when collecting light beam due to optical wand, can be because being lost more than ranges of incidence angles for the diverging light for deviateing optical axis wide-angle farther out, it is impossible to complete to collect.Therefore by the diffusion homogenization again of diffusion sheet in technical solution of the present invention, by the Energy distribution for weakening high dispersion angle light beam to a certain extent, so as to reduce into light loss during optical wand, beneficial to raising light-source brightness, by the lifting to beam energy near 0 degree of optical axis, light beam is improved by optical efficiency during optical mirror slip, while indirectly beneficial to the brightness for improving light source.
Laser beam after diffusion also passes through the second conical mirror, due to collection and secondary homogenization of second conical mirror to the laser beam after diffusion, nearby the light beam of angle and the energy of the light beam with each dispersion angle are evenly distributed state to make to be distributed in 0 degree and optical axis, improve the uniform distribution of forces of whole laser beam light beam in all angles.The Laser beam energy distribution schematic diagram after the second conical mirror as shown in Figure 7, by contrasting with Fig. 5 and Fig. 6, laser beam light energy of angle near 0 degree or optical axis increases, distribution proportion is improved, the light beam of all angles, it is in each balancing energy between Gaussian Profile, but each light beam that either 0 degree of optical axis still has the divergent beams of various dispersion angles, it is evenly distributed, so as to even distribution of the whole laser beam in all angles is improved.
Based on this distribution，On the one hand，There are multiple dispersion angles through secondary homogenized laser beam，The diversity principle of dispersion angle can be utilized to carry out dissipation spot，Simultaneously，Compared to the beam distribution of each angle after the first conical mirror，The energy proportion that will be distributed over 0 degree and the light beam near optical axis is lifted，Beneficial to light treatment effeciency of raising laser beam when through optics，This can be tried one's best along optical axis because general optics arranges Shi Qi centers，So most of light can be by optics normally through process，Such as，Light compared to 0 degree is along optical axis incidence convex lens，Dispersion angle is that 5 degree of light may be incident along the marginal portion of convex lens，The processing or structure for being likely due to meniscus edge is blocked reason and can not normally be assembled，Cause the decline of optical treatment efficiency，And this measure for reducing the distribution of wide-angle angle of divergence beam energy enables in particular to prevent the energy proportion of wide-angle divergent beams too high and light loss when causing entry into light collecting part，When LASER Light Source provides illumination for x ray machine part，The incident angle of optical wand has been normally set up a concrete scope，And the incident angle range of optical wand is also relevant with the optical parametric of camera lens，Adjustable range is less，If for the beam section that the energy of laser beam is concentrated mainly on high dispersion angle，Lose so for dispersion angle cannot propagate into optical wand more than the light of optical wand incidence angle，If the energy proportion of this segment beam is larger，Necessarily cause increasing for light loss situation，Therefore through the secondary homogenization of the second conical mirror，The light beam for enabling to the light beam of angle and many dispersion angles near 0 degree and optical axis is in each Gaussian Profile，And in uniform state，Advantageously reduce the brightness that light loss improves LASER Light Source.
In being embodied as, if laser beam is after the dissipation spot of above-mentioned first conical mirror, diffusion sheet and the second conical mirror is processed, the angle of divergence is larger, cause etendue quantitative change big and be unfavorable for fully entering next optics, light can be set in light path and assemble part, such as convex lens, line convergence is entered to light beam, reach incident angle requirement, in particular for the requirement of optical wand incident angle range, reduce the angle of divergence of laser beam after shaping, light beam as much as possible is entered in optical wand, light collection efficiency is improved, beneficial to the brightness for improving laser lighting light source.
To sum up, above-mentioned first conical mirrors of Jing, distribution mode of the laser beam after diffusion sheet and the second conical mirror collective effect from Gaussian integrated distribution near 0 degree and optical axis is changed into multiple angles of divergence, and with the mode of the homogenizer distribution of angle near multiple angles of divergence and 0 degree and optical axis, both the dispersion angle of laser beam had been increased, 0 degree and optical axis are nearby homogenized with the Energy distribution of the light beam of high dispersion angle again, the dissipation spot effect of laser and the luminance raising of LASER Light Source can be taken into account, with higher practical value.
Embodiment 2
The embodiment of the present invention 2 provides a kind of two-color laser light source, and the laser dissipation spot light path described in embodiment 1 is applied in two-color laser light source framework.
Specifically, as shown in Figure 7, two-color laser light source includes blue laser 11 and red laser 12, blue laser and red laser are sent respectively, blue laser and red laser can be respectively one group or multigroup, both can be with arranged in parallel, it is also possible to setting arranged vertically, and closing light light path volume, the complexity of radiator structure can be considered in the specific implementation to be selected；And fluorescent wheel 3, in being arranged at blue laser emitting light path, including phosphor region（Not shown in figure）And transmission area（Not shown in figure）, phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, transmission area to be used to transmit the blue laser by blue laser.
For blue laser light path, blue laser 11 sends blue laser, according to rotation sequential, the fluorescent material area of a part of blue laser incident fluorescence wheel 3, excite fluorescent wheel to produce the green glow of one of three primary colours, a part of blue laser is passed through from the transmission area of fluorescent wheel, produce the blue light of one of three primary colours.
As described in example 1 above, the laser facula area sent from laser instrument is larger, in order to improve launching efficiency of the laser to fluorescence, and efficiency of transmission of the raising laser in optics, need to be focused the laser facula that laser instrument sends diminution, the hot spot for forming little high-energy-density is got on the fluorescent material of fluorescent wheel 3.Therefore, the blue laser that blue laser 11 sends needs to be focused through the first focus lens group 27, forms little laser facula.First focus lens group 27 can include two panels convex lens, as shown in Figure 8.In this two panels convex lens, the convex lens type arranged near laser instrument is larger, and for comprehensively receiving the hot spot that laser instrument directly sends, the convex lens type arranged near fluorescent wheel is less, for to the hot spot secondary focusing Jing after first piece convex lens focus, accelerating the diminution of facula area.And, in another kind of enforcement, the first focus lens group 27 can also include a telescopic system being made up of convex lens and concavees lens, and a piece of convex lens, first carry out shrink beam to laser beam, then be focused.
In embodiments of the present invention, in order to simplify the combining of blue laser and green fluorescence, reduce the use that optical axis changes eyeglass, using transmission-type fluorescent wheel, the fluorescent material of fluorescent wheel 3 is arranged on the transparent substrate or by fluorescent material and inorganic material, such as ceramics, and mixed sintering makes fluorescent material plate body, the plate body is transparent, can allow for light and passes through.And it is provided with high thoroughly blue anti-green plated film on the outside of phosphor powder layer, because the exit direction of the fluorescence being excited is along all directions, when part-green fluorescence is along when the outgoing of fluorescent wheel front, thoroughly blue anti-green plated film is reflected can green fluorescence and along the incident direction of blue laser from the outgoing of the fluorescent wheel back side to the height, so as to, fluorescent wheel 3 can be sequentially output blue laser and green fluorescence in rotary course according to sequential.
Compared to reflection-type fluorescent wheel, the loop design of blue laser is eliminated, loop design generally includes condenser lens, plane mirror etc., therefore saves the usage quantity and species of optical mirror slip.
Because the blue laser and green fluorescence dispersion angle Jing after the outgoing of fluorescent wheel 3 is larger, collimation lens set 28 is additionally provided with the back side of fluorescent wheel 3, for carrying out being collimated into the output of parallel or less parallel light beam to the blue laser for dissipating and green fluorescence.Collimation lens set 28 generally includes two panels convex lens, or a piece of hypersphere lens.
Collimated blue laser and green fluorescence reaches closing light part 4, and with red laser closing light is carried out.
For red laser light path, because the speckle effect sensitivity that human eye is produced to red laser is more than to blue laser, in embodiments of the present invention, it is specifically designed for red laser light path and is provided with dissipation spot light path, for to the process of red laser dissipation spot, mitigating because the use of red laser is for the impact that whole two-color laser light source speckle is deteriorated.
Specifically，The dissipation spot light path referred in embodiment 1 is arranged，Red laser incident first conical mirror 23 successively Jing after shrink beam part 21 successively，Diffusion sheet 24，And second conical mirror 25，By homogenization of first conical mirror 23 to red laser Gaussian Energy distribution，Become the distribution of class Bessel type，Because the beam energy distribution of angle is no longer excessively concentrated near 0 degree or optical axis，The energy of the segment beam is significantly slackened，Energy proportion is drastically reduced，And this segment beam angle is identical，Phase place or constant phase difference，It is the main cause for causing laser spatial coherence strong，With tailing off for this segment beam，The spatial coherence degree of laser beam also weakens therewith，The light beam of many dispersion angles is formed simultaneously，And dissipate the enhancing of the phase difference otherness between angular light beam more，The probability for interfering is substantially reduced.Simultaneously, diffusion sheet 24 is in motion process, play a part of uniform diffusion, therefore, it is possible to be spread respectively to each light beam ring of class Bessel type light beam, further increase the angle of divergence of each light beam ring light and the randomness of dispersion angle, by with the first conical mirror 23 to gaussian laser type light beam to break up effect superimposed, increased the degree of divergence of laser beam, and form multiple dispersion angles, and the diversity of dispersion angle can bring the interference condition of destruction constant phase difference such that it is able to play a part of dissipation spot to red laser.
And, due to the collection and secondary homogenization of the laser beam after the 25 pairs of diffusions of the second conical mirror, nearby the light beam of angle and the energy of the light beam with each dispersion angle are evenly distributed state to make to be distributed in 0 degree and optical axis, improve the uniform distribution of forces of whole laser beam light beam in all angles.So as to have multiple dispersion angles through secondary homogenized laser beam, the diversity principle of dispersion angle can be utilized to carry out dissipation spot, meanwhile, it is capable to the light loss that the light beam for reducing high dispersion angle is likely to result in optical transmission process, is conducive to improving the brightness of red laser.
Red laser also reaches closing light part 4 Jing after dissipation spot, and with blue laser and green fluorescence closing light is carried out.
In embodiments of the present invention, closing light part 4 is specially a piece of dichroscope, by plated film, is transmissive to ruddiness and reflects blue light and green glow.
Light guide member 5 is reached after red laser, blue laser and green fluorescence ECDC light, light collection is carried out, to provide illumination for projector equipment ray machine.Light guide member is usually optical wand.Used as a part for ray machine, the dmd chip for the three primary colours light of light source part sequential export to be conducted to ray machine is modulated optical wand, and projects to and formed on screen image.Because optical wand has certain incident angle range, dispersion angle exceedes the light beam of the incident angle range and will be unable to enter optical wand, causes the waste of luminous energy, therefore three primary colours light is usual also through condenser lens before light guide member is reached, to reduce dispersion angle.
In embodiments of the present invention, being provided with the second condenser lens 26 is used to be focused three primary colours closing light, makes more light beams disclosure satisfy that the incident angle range of light guide member 5, improves light-source brightness.
In embodiments of the present invention, red laser 12 and blue laser 11 are to be set up in parallel, before combining, needs carry out optical axis direction conversion to one of light path, to enable blue laser and red laser with orthogonal optical axis direction through a piece of dichroscope to transmit all the way, the mode for reflecting all the way carries out closing light.Therefore speculum 22 is provided with red laser light path, speculum 22 can be plane mirror.If red laser 12 and blue laser 11 are to be vertically arranged, 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 the use of reflection mirror component.
Due to human eye it is more sensitive compared to blue laser for the speckle effect of red laser, therefore, it is just more necessary for the speckle issue that disappears of red laser in two-color laser light source.In embodiments of the present invention, by arranging biconial mirror and diffusion chip part in the light path of red laser, dissipation spot process as described in example 1 above, the coherence of red laser can both be alleviated, and then speckle effect when mitigation red laser light source and two-color laser light source applications, the purpose of dissipation spot is realized, while the light loss of red laser can be reduced, dissipation spot is realized and is improved the dual purpose of LASER Light Source brightness.
Compared in prior art, using random phase device or the scheme of optical fiber dissipation spot, laser dissipation spot light path provided in an embodiment of the present invention carries out dissipation spot using the combination of biconial mirror and diffusion sheet, by the regularity of distribution for changing laser beam energy, increase the diversity of beam divergence angle destroying coherent condition, the coherence that gaussian laser type distribution brings in itself can fundamentally be changed, effectively reduce the spatial coherence of laser beam, and reduce the light loss of the laser during dissipation spot.
Simultaneously, two-color laser light source framework provided in an embodiment of the present invention, to increased dissipation spot part in red laser light path, dissipation spot had been carried out before closing light, to blue laser and green fluorescence, realize exporting in the same direction by using a transmission-type fluorescence wheel component, three reaches same closing light part and carries out closing light output, forms three primary colours.The light source framework had both solved the problems, such as the speckle effect of red laser, can provide high-quality laser lighting light source, while also realizing combining and the closing light of three primary colours using less optics, light source framework is simple, and small volume is easy to the miniaturization of laser equipment.
Embodiment 3
The embodiment of the present invention 3 is unlike embodiment 2, fluorescent wheel 3 is reflective fluorescent wheel, as shown in figure 8, the fluorescence that reflective fluorescent wheel is excited to produce is projected by the reflex of aluminium base towards the direction relative with blue laser incident direction, closing light part 4 is placed in before fluorescent wheel 3.
In order to collimate to the fluorescence of the blue laser for transmiting and reflection, the front and back in fluorescent wheel 3 is needed to be provided with collimation lens set 28.Wherein blue laser will also be through relaying loop after the collimation lens set 28 at the fluorescent wheel back side, including the part such as relay lens and plane mirror, and optics 25 as shown in Figure 9 is back to closing light part 4.Closing light part 4 is a dichroscope, by plated film, realizes blue thoroughly red anti-green selection index system thoroughly.Therefore, can allow for blue laser and first transmit and be irradiated to fluorescence wheel surface, excite green emitting phosphor to send green fluorescence, the mirror-reflection in green fluorescence Jing non-fluorescence area, closing light part 4 is reached along with the incident relative direction of blue laser, Jing dichroscopes are reflected away.
For red laser light path, the dissipation spot light path disclosed in embodiment 1 can be adopted in the same manner, after dissipation spot light path, red laser reaches closing light part 4, and by the transmission of closing light part 4 diminution for carrying out the angle of divergence is applied to up to condenser lens.
In embodiments of the present invention, also with embodiment 1, its same section content is repeated no more again the dissipation spot light path mechanism and beneficial effect of red laser.
And, from unlike transmission-type fluorescent wheel, although reflective fluorescent wheel needs to carry out loop design for blue laser, but the conversion effect of fluorescence is of a relatively high, this is because during at present transmission-type fluorescent wheel is due to fluorescence excitation, heat accumulation has significantly affected the conversion efficiency of fluorescence, and light-source brightness is had a certain impact.
Above-mentioned embodiment, those skilled in the art can be selected according to the radiating of light-source system, Structural Design Requirement.
Embodiment 4
The embodiment of the present invention 4 provides a kind of three colors LASER Light Source, and the dissipation spot light path that can be based on described in embodiment 1 carries out dissipation spot.
Below as a example by based on embodiment 1, propose a kind of three color LASER Light Source structural representations of example, as shown in Figure 10, tri-color laser 11,12,13 send respectively redness, blue and green laser, wherein, tri-color laser passes through respectively two panels dichroic piece 21,22 carry out closing light, a kind of light combination mode is only provided in this example, it is also possible to using other closing light elements such as closing light mirror, do not limit and this.
Dichroic piece 21 realizes that red laser is transmitted by plated film, blue laser reflects, and dichroic piece 22 realizes the transmission of red laser and blue laser, the reflection of green laser, so as to the laser of three tunnel colors is formed output light all the way by the light combination process for passing through two panels dichroic piece by plated film.
Output light all the way after the closing light passes through first shrink beam part 23, specifically, can be the telescopic system that is made up of a piece of convex lens and a piece of concavees lens, carry out the diminution of beam area, so that hot spot all by taper mirror element below can improve optical treatment efficiency.
The closing light of three color laser carries out dissipation spot by the first conical mirror 3, the conical mirror 5 of diffusion sheet 4 and second, and its mechanism and beneficial effect are same as Example 1, will not be described here.
And, other opticses not shown in the light-source structure figure of example of the present invention after the second conical mirror, part is such as assembled, for larger when the light dispersion angle Jing after diffusion sheet diffusion and be added when being unsatisfactory for the incident angle of rear end light collecting part-optical wand.If laser light beam of light combination dispersion angle meets optical wand incident angle requirement, can be without part to be assembled, 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 the first conical mirror pairing ray laser light beam in the embodiment of the present invention，Gaussian-shaped beam is carried out to homogenize shaping，The distribution mode that original energy is concentrated is become with the relatively homogenized distribution mode of certain dispersion angle and each dispersion angle energy，Significantly reduce and the stronger beam section of laser coherence is caused near 0 degree of optical axis，And using the diffusion of diffusion sheet，Further increase the degree of divergence and dispersion angle random distribution of each laser light beam of light combination，By with the first conical mirror to gaussian laser type light beam to break up effect superimposed，Can reach makes the multifarious purpose of beam divergence angle，Simultaneously using the second conical mirror is to the collection of laser beam after diffusion and secondary homogenizes shaping operation，0 degree and optical axis can be made to be distributed in, and nearby the light beam of angle and the energy of the light beam with each dispersion angle are evenly distributed state，Improve the uniform distribution of forces of whole laser beam light beam in all angles，Both the diversity of laser beam reflection angle had been realized，The energy proportion that can reduce wide-angle divergent beams again is too high and light loss in the light processing procedure that causes，Ensure that the brightness of LASER Light Source.
Therefore, the three color LASER Light Sources that the embodiment of the present invention 4 is provided can either have good dissipation spot effect, while also there is higher brightness, with higher practical value.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creative concept, then other change and modification can be made to these embodiments.So, claims are intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art the present invention can be carried out it is various change and modification without departing from the spirit and scope of the present invention.So, if these modifications of the present invention and modification belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprising these changes and modification.
Claims (14)
1. a kind of laser dissipation spot light path, including laser instrument, sends laser, it is characterised in that also include the first conical mirror set gradually along laser output light path, diffusion sheet, and the second conical mirror；
First conical mirror is used to that laser beam to be carried out to homogenize shaping,
The diffusion sheet is used to be diffused the laser beam Jing after the first conical mirror homogenizes shaping,
Second conical mirror is used to be collected the laser beam after diffusion and secondary homogenize.
2. dissipation spot light path according to claim 1, it is characterised in that first conical mirror, the second conical mirror are Conical Lenses.
3. dissipation spot light path according to claim 1 and 2, it is characterised in that the diffusion sheet does and rotates or translational motion.
4. dissipation spot light path according to claim 1, it is characterised in that the dissipation spot light path also includes shrink beam part, for the laser beam to be carried out into incident first conical mirror after shrink beam.
5. dissipation spot light path according to claim 4, it is characterised in that the shrink beam part includes the telescopic system being made up of a piece of convex lens and a piece of concavees lens.
6. dissipation spot light path according to claim 1, it is characterised in that first conical mirror is oppositely arranged with the second conical mirror.
7. a kind of two-color laser light source, including blue laser and red laser, send respectively blue laser and red laser；Fluorescent wheel, in being arranged at blue laser emitting light path, including phosphor region and transmission area, the phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, the transmission area to be used to transmit the blue laser by the blue laser, it is characterised in that
The fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and closing light part is reached after the blue laser and the collimated lens group of green fluorescence；
The red laser reaches the closing light part Jing after dissipation spot light path, at least provided with the first conical mirror in the dissipation spot light path, diffusion sheet, and the second conical mirror,
Wherein described first conical mirror is used to that laser beam to be carried out to homogenize shaping,
The diffusion sheet is used to be diffused the laser beam Jing after the first shaping is homogenized,
Second conical mirror is used to enter line convergence shaping to the laser beam after diffusion；
Export to light guide member after the blue laser, green fluorescence and red laser ECDC light.
8. LASER Light Source according to claim 7, it is characterised in that first conical mirror, the second conical mirror are Conical Lenses.
9. the LASER Light Source according to claim 7 or 8, it is characterised in that the diffusion sheet does and rotates or translational motion.
10. LASER Light Source according to claim 7, it is characterised in that the closing light part is dichroscope.
11. LASER Light Sources according to claim 7, it is characterised in that the dissipation spot light path also includes shrink beam part, for the red laser light beam to be carried out into incident first conical mirror after shrink beam.
12. dissipation spot light paths according to claim 7, it is characterised in that first conical mirror is oppositely arranged with second conical mirror.
13. dissipation spot light paths according to claim 7, it is characterised in that export to before light guide member after the blue laser, green fluorescence and red laser ECDC light also through convergence part, for reducing the closing light after light beam the angle of divergence.
A kind of 14. three colors LASER Light Sources, including tri-color laser, send respectively the color laser of red, green, blue three, it is characterised in that after the tri-color laser ECDC light, and the laser dissipation spot light path described in Jing claims 1-6 carries out dissipation spot.
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| CN201510643398.5A CN106569379B (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/CN2016/075920 WO2017059657A1 (en) | 2015-10-08 | 2016-03-09 | Laser dispersed spot optical path, two-color laser light source and three color laser light source |
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| WO2017059657A1 (en) | 2017-04-13 |
| CN106569379B (en) | 2018-09-21 |
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