WO2017059656A1 - Chemin optique d'une tache laser dispersée - Google Patents

Chemin optique d'une tache laser dispersée Download PDF

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Publication number
WO2017059656A1
WO2017059656A1 PCT/CN2016/075911 CN2016075911W WO2017059656A1 WO 2017059656 A1 WO2017059656 A1 WO 2017059656A1 CN 2016075911 W CN2016075911 W CN 2016075911W WO 2017059656 A1 WO2017059656 A1 WO 2017059656A1
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WIPO (PCT)
Prior art keywords
laser
light
blue
red
mirror
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PCT/CN2016/075911
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English (en)
Chinese (zh)
Inventor
田有良
刘显荣
李巍
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海信集团有限公司
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Publication of WO2017059656A1 publication Critical patent/WO2017059656A1/fr

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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
    • 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

Definitions

  • Laser dissipating spot light path and two-color laser light source, three-color laser light source Laser dissipating spot light path and two-color laser light source, three-color laser light source
  • the present invention relates to the field of laser display technologies, and in particular, to a laser dissipating spot light path and a two-color, three-color laser light source.
  • Laser is a high-brightness, directional, light source that emits a monochromatic coherent beam. Due to its many advantages, laser has been used as a light source in projection display technology in recent years. The high coherence of the laser brings the speckle effect of the laser projection. The so-called speckle refers to the coherent light source illuminating the rough object. The scattered light, because of its same wavelength, the phase is constant, will be in space. Interference occurs, some parts of the space interfere with the constructive phase, and some of them interfere with the cancellation. The final result is a grainy bright and dark spot on the screen. These unfocused spots are flickering in the eyes of the human eye. Interviewing is prone to vertigo discomfort, which further degrades the quality of the projected image and reduces the user's viewing experience.
  • the more types of laser light sources the more severe the speckle effect.
  • the human eye is more sensitive to the red laser speckle effect than to the blue laser, so the red laser source's dissipative spot design is particularly important.
  • One technique is to use a vibrating display screen to reduce the integral effect of the speckle spots in the human eye through the vibration of the screen, but it is not practical for large-size screen control, and the projection is currently developing toward the screenless direction;
  • One technique is to use a multimode fiber so that the length between adjacent fibers is greater than the coherence length of the light source, thereby reducing coherence, but the volume of the fiber is large, the propagation path of light in the fiber is long, and the optical energy loss is also large. Not applicable to current laser light source designs for miniaturization and highlighting.
  • the scattering spot is also performed by providing a moving diffusion sheet or a diffusion sheet in the laser light path, but the effect is limited. technical problem
  • the invention provides a laser dissipating spot light path, a two-color laser light source and a three-color laser light source, which can improve the dissipating effect of the laser and solve the speckle effect problem of the laser light source application.
  • the present invention firstly provides a laser dissipating spot light path, comprising a laser, emitting a laser; at least a conical mirror and a diffusion sheet disposed behind the conical mirror, the laser sequentially passing through the conical mirror and the diffusion sheet
  • the cone mirror is configured to perform energy distribution homogenization on the laser beam
  • the diffusion sheet is configured to diffuse the laser beam after the energy distribution is homogenized.
  • the conical mirror is a conical lens.
  • the diffusion sheet performs a rotating or translational motion.
  • the laser dissipating spot light path further includes a constricting component for reducing the beam of the laser beam and then entering the conical mirror.
  • the laser dissipating spot light path further includes a collimating member for collimating the diffused light beam to form a parallel beam.
  • the beam reducing component comprises a telescope system consisting of a piece of convex lens and a piece of concave lens.
  • the collimating member includes a convex lens or a convex lens lens group.
  • the present invention also provides a two-color laser light source, including a blue laser and a red laser, respectively emitting a blue laser and a red laser; a fluorescent wheel disposed in the blue laser exiting optical path, including a fluorescent region and a transmissive region
  • the fluorescent region is provided with a green phosphor for excitation by a blue laser to generate green fluorescence, and the transmission region is for transmitting the blue laser; wherein the fluorescent wheel sequentially outputs blue laser and green fluorescence according to the order, blue
  • the color laser and the green fluorescent light are passed through the collimating lens group to reach the light combining member; and the red laser light passes through the dissipative light path to reach the light combining member, wherein the dispersing spot light path is provided with at least a conical mirror and placed behind the conical mirror
  • the diffuser is used to homogenize the red laser beam for energy distribution, and the diffuser is used to diffuse the red laser beam after the energy distribution is homogenized; blue laser, green The fluorescent and red laser light
  • the conical mirror is a conical lens.
  • the diffusion sheet performs a rotating or translational motion.
  • the light combining member is a dichroic mirror.
  • the dissipating spot light path further includes a constricting component for reducing the red laser beam and then entering the conical mirror.
  • the dissipating spot light path further includes a collimating member for collimating the diffused red laser beam to form a parallel beam.
  • the blue laser light, the green fluorescent light, and the red laser light are combined by the light and outputted to the light guiding member before passing through the converging member for reducing the diffusion angle of the combined light beam.
  • the technical solution of the present invention further provides a three-color laser light source, including a three-color laser, emitting red
  • the laser dissipative spot light path of the above scheme is used to dissipate the spots.
  • the laser dissipating spot light path can disperse a Gaussian-type distributed laser beam into a Bessel-type beam by using a conical mirror in the laser beam path, and using the optical characteristics thereof, Homogenization shaping, from the energy distribution pattern concentrated at the 0 degree optical axis and the nearby divergence angle to a distribution pattern with multiple divergence angles and relatively uniform energy at each divergence angle, greatly weakens the vicinity of the 0 degree optical axis
  • the portion of the beam that causes the laser coherence is strong, and the diffusion beam disposed behind the conical mirror can further diffuse the laser beam after the energy distribution is homogenized, thereby diverging the various types of Bessel-type beams.
  • the angle beam is further diffused, enhancing the random distribution of divergence and divergence angle, and achieving the purpose of diverging the angle of the laser beam, and the diversity of the divergence angle can cause the difference of the optical path difference of the light transmission, and the difference of the optical path lengths Different phase changes, so the probability of the same phase or constant phase difference is greatly reduced , destroying one of the conditions for interference, thus reducing the degree of coherence of the laser and the speckle effect of the laser light source application, and achieving the purpose of dissipating the plaque.
  • the technical solution of the present invention can eliminate the speckle by using a combination of a conical mirror and a diffusion sheet, and can fundamentally change the characteristics of the laser Gaussian energy distribution, thereby effectively eliminating the coherence of the Gaussian distributed beam itself, and the optical path.
  • the number of optical components used in the system is small, and the optical structure is simple, which is convenient for popularization and application.
  • the technical solution of the present invention further provides a two-color laser light source, including a blue laser and a red laser, by using the above-mentioned dissipating spot light path to dissipate the red laser, so that the red laser can pass through the cone mirror and the diffusion sheet.
  • the synergistic effect is to achieve the purpose of omnidirectional laser beam angle, thereby destroying the interference condition with constant phase or phase difference, and reducing the coherence of the red laser beam. Since the human eye is more sensitive to the speckle effect of the red laser, the red laser is reduced. The degree of coherence also reduces the speckle effect of the two-color laser source application, and achieves the purpose of dissipating the speckle of the two-color laser source.
  • the blue laser is excited to emit green fluorescence after being incident on the fluorescent wheel, and the green fluorescent light and the blue laser light are sequentially output by a fluorescent wheel member according to the order, and then the red laser after the dissipative spot is
  • the blue laser and the green fluorescent light are combined by a light combining member, which eliminates the spot light path and the combined light combining and combining components, has a simple optical structure, and can provide a laser light source with low speckle and high brightness.
  • the three-color laser laser provided by the technical solution of the present invention forms a light beam after being combined, and a laser dissipative spot light path formed by a cone mirror and a diffusion sheet, based on the above-mentioned cone mirror and diffusion sheet
  • the three-color laser light source provided by the technical solution of the present invention can effectively dissipate the plaque and provide a low speckle, high-brightness laser illumination source.
  • FIG. 1 is a schematic diagram of optical path propagation of a conical mirror of the prior art
  • FIG. 2 is a schematic diagram of a bessel-like beam spot distribution
  • FIG. 3A is a schematic diagram of a Gaussian beam distribution in the prior art
  • FIG. 3B is a schematic diagram of a Gaussian beam spot distribution
  • FIG. 4 is a schematic diagram of a laser dissipating spot light path according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of energy distribution of a laser beam after passing through a conical mirror according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of energy distribution of a laser beam after passing through a diffusion sheet according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic diagram of a laser dissipating spot light path according to Embodiment 2 of the present invention.
  • Embodiment 8 is a schematic diagram of energy distribution of a laser beam in Embodiment 2 of the present invention.
  • FIG. 9 is a schematic structural diagram of a two-color laser light source according to Embodiment 3 of the present invention.
  • FIG. 10 is a schematic structural diagram of a two-color laser light source according to Embodiment 4 of the present invention.
  • Embodiments of the invention are a schematic structural diagram of a three-color laser light source according to Embodiment 5 of the present invention.
  • the optical characteristics of a conical mirror having a tapered surface and a flat surface, wherein the light is incident from one side of the plane can be used to generate a diameter that can be increased with distance.
  • a non-diffractive annular beam of uniform annular thickness is maintained.
  • the conical refraction has a focus convergence effect, but the light emitted through the apex E of the cone diverge in multiple directions, thereby dispersing the beam energy. .
  • a diamond-shaped intersection of the beam is formed in the exit direction of the conical mirror, as shown in the shaded portion of FIG. 1, in this region, for example, as shown in FIG.
  • the XY plane is imaged and observed, and a plurality of concentric annular beams can be observed, as illustrated in FIG. Among them, the light beam located in the inner layer or the light beam near the center of the beam ring is weaker in the plurality of concentric annular beams, and the beam energy in the outer layer is stronger.
  • the color intensity of the beam ring is used to illustrate the energy intensity of the beam ring. The contrast.
  • Embodiment 1 of the present invention provides a laser dissipating spot light path. As shown in FIG. 4, the laser 1 is included, and one or more groups may be used to emit laser light.
  • the laser may be a blue laser or a red laser or green.
  • the laser is not specifically limited to a specific color.
  • a cone mirror 3 and a diffusion sheet 4 placed behind the cone mirror are provided in the dissipating spot light path, and the conical mirror 3 and the diffusion sheet 4 are combined as a core component of the dissipating spot.
  • the conical mirror is used for homogenizing the energy distribution of the incident laser beam, changing the energy distribution type of the laser Gaussian beam
  • the diffusion sheet is used for diffusing the laser beam after the energy distribution is homogenized, further increasing the laser beam The divergence of the beam enhances the divergence angle.
  • the diverging spot light path further includes a constricting member 2 for the laser beam for the large spot. Reduce the beam size and reduce the spot area so that the beam can pass through the subsequent optics - cone
  • the transmission in the mirror reduces the loss of light energy during transmission and improves the shaping efficiency of the laser beam by the cone.
  • the constricted component 2 is located between the laser 1 and the conical mirror 3.
  • the contracting member 2 may be a telescope system consisting of a convex lens and a concave lens. The laser spot area after the telescope system is reduced, and the beam is contracted, so that it can be easily lowered. An optical lens, that is, a conical mirror 3, is all received.
  • the conical mirror 3 may specifically be a conical lens, and the optical component has a circular cross section, which is convenient for receiving circular or elliptical or square laser spots, and has low processing cost.
  • Fig. 3A shows a schematic diagram of the distribution of a Gaussian beam, the energy is concentrated near the optical axis, that is, the energy of the beam at an angle of 0 degrees and the vicinity of the optical axis occupies most of the entire laser beam, and the energy is concentrated, and in the same light source, the beam The incident angle is the same, and the phase or phase difference is constant, which is the main reason for the strong coherence of the laser space.
  • Fig. 3B is a schematic view showing the spot of the laser coherent light source. The center of the spot is dark in color and the light energy density is large, so the coherence is also the strongest.
  • the Gaussian-type beam is scattered to form a Bessel-like beam
  • the Bezier-type beam is a plurality of concentric beam rings
  • different beam rings are in the transmission process.
  • the difference between the optical path difference and the phase difference is larger than the coherence length (the coherence length refers to the maximum optical path difference in which the light source with a certain spectral width can interfere), thereby reducing the plurality of beam rings to some extent. The probability of interference between them.
  • the conical lens breaks the beam partially passing through the apex of the cone of the conical mirror, increasing the angle of the divergence angle of the beam and increasing the diversity of the divergence angle.
  • the laser beam becomes a Bessel-like beam loop distribution
  • its energy distribution also changes, as shown in Figure 5.
  • the vertical axis represents the intensity of the energy distribution of the beam
  • the horizontal axis represents the divergence angle formed by the optical axis of 0 degrees or the degree of divergence of the beam.
  • the original Gaussian beam energy distribution becomes the multi-angle beam energy distribution mode shown in Fig. 5.
  • the energy intensity of the beam at the angle of divergence at 0 degrees or near the optical axis in Figure 5 is sharply weakened, and the ratio is greatly reduced.
  • the incident angle of the beam is the same, the phase or phase difference is constant, and the vibration direction is the same.
  • the figure also shows the beam energy distribution curves of multiple divergence angles, and the proportion of the energy of the divergence angle beams in the whole beam increases, and The beam energy at each divergence angle is relatively uniform.
  • the energy distribution of the beam at an angle of 0 degrees or near the optical axis is no longer concentrated but is broken up, forming a beam with multiple divergence angles, multiple divergence angles
  • the difference in phase difference between the beams is enhanced, and the probability of interference is greatly reduced, thereby also making the spatial coherence of the entire laser source weak.
  • the diffusion sheet 4 is located behind the conical mirror 3 for diffusing the Bessel-type beam emitted through the conical mirror 3 to enhance the effect of decoherence. This is because, although the Bezier-type beam has multiple concentric beam rings, the distance between the beam rings exceeds the coherence length of the beam, which is not conducive to interference between the beams of the respective beam rings, but within each beam ring. The beams are still within the coherence length range and still have strong coherence characteristics. Therefore, in the present embodiment, the diffusion sheet 4 is further provided after the conical mirror 3.
  • the diffusion sheet 4 is a moving diffusion sheet, which may be a rotary motion or a translational motion, because the moving diffusion sheet can increase the random distribution of the divergence and the divergence angle of the laser beam, and increase the randomness of the laser beam.
  • the spatial phase is better than the fixed placement of the diffuser.
  • the moving diffusion sheet needs to be driven by a driving device, and the driving device can be implemented by using the prior art, which will not be described in detail in the embodiment of the present invention.
  • the diffusion sheet 4 plays a role of uniform diffusion during the movement, so that the respective beam loops of the Bezier-type beam can be separately diffused, and the divergence angle and the divergence angle of each beam ring are further increased.
  • Sexuality by superimposing the scattering effect of the laser Gaussian beam with the conical mirror 3, the purpose of diverging the angle of the laser beam is achieved, and the diversity of the divergence angle can cause the optical path difference of the light transmission, the so-called optical path difference It is the difference between the optical paths of two beams reaching a point, which is the amount indicating the nature of the interference fringes.
  • two beams of different divergence angles emitted by the same light source are propagated in the same medium, and the optical path difference can be simply derived from the geometric path difference. For example, 0-degree light and 5-degree divergence angles of light reach the same optical lens (considered as the same point).
  • phase Difference 2 ⁇ / ⁇ ⁇ optical path difference ( ⁇ is the wavelength in vacuum, in the present embodiment, the same laser, ⁇ is the same), different optical path differences lead to different phase changes, so the phase is the same or the phase difference is constant
  • the probability is greatly reduced, which destroys one of the conditions of interference, thereby reducing the degree of coherence of the laser and the speckle effect of the laser source application.
  • the divergence angle can be randomly redistributed, thereby
  • the beam with a large angle of divergence in the Bessel-type distribution, and the beam near the 0-degree optical axis are again homogenized, so that the energy of the beam with a large angle of divergence is reduced, and the energy of the beam near the 0-degree optical axis is appropriately enhanced.
  • the energy distribution of the laser beam after passing through the diffuser 4 is shown in Fig. 6. As can be seen from Fig. 5, the beam energy at the diverging angles on both sides is reduced, and the energy of the beam near the 0-degree optical axis is improved.
  • the light energy near the optical axis is strong, which is convenient for improving the optical efficiency of the light beam passing through each optical lens, especially for the light bar collection of the rear end optical machine portion, due to the incident angle range of the light beam collecting beam ⁇
  • the limitation is that the divergent light at a large angle far from the optical axis is lost because it is larger than the incident angle range, and the collection cannot be completed. Therefore, in the technical solution of the present invention, by the re-diffusion homogenization of the diffusion sheet, by reducing the energy distribution of the large divergence angle beam to a certain extent, the light loss entering the light rod ⁇ is reduced, and the brightness of the light source is improved, and the light is 0°.
  • the increase of the beam energy near the axis improves the optical efficiency of the beam passing through the optical lens, and indirectly helps to increase the brightness of the light source.
  • the embodiment of the present invention further includes a collimating component 5 for collimating the laser beam that has been shaped and diffused by the conical mirror and the diffusion sheet, to reduce the divergence angle to form a parallel or nearly parallel beam, and satisfy the following The angle of incidence of an optical component.
  • the collimating member is a convex lens group composed of a convex lens or two convex lenses, which can collimate or converge the diverging beam.
  • the laser beam passes through the dissipative spot processing to combine light into the light guiding member.
  • it is usually a light bar, and the light bar has a certain range of incident angles, and the divergence angle exceeds the incident angle range.
  • the beam will not enter the light bar, causing a waste of light energy. Therefore, if the collimating component 5 has insufficient collimation effect on the light beam, a plurality of convex lenses can be used to collimate or converge the diverging laser beam, and the divergence angle of the beam is reduced, thereby meeting the incident angle requirement of the light guiding member, and improving the guiding.
  • the light collection efficiency of the optical component increases the brightness of the laser illumination source.
  • the laser dissipating spot light path provided by Embodiment 1 of the present invention firstly uses a conical mirror to break up a Gaussian-type distributed laser beam to form a Bessel-type beam, and homogenizes the laser beam from the concentration.
  • the energy distribution pattern of the optical axis and the nearby divergence angle becomes a distribution pattern having a plurality of divergence angles and relatively uniform energy of the divergence angles, and the beam portion having a strong laser coherence near the optical axis of 0 degrees is greatly weakened, and is effective.
  • the spatial coherence of the laser beam is reduced, and the diffusion beam disposed behind the conical mirror can further diffuse the laser beam after the energy distribution is homogenized, so that various divergence angles of the Bessel-type beam can be obtained.
  • the beam further diffuses, enhances the degree of divergence, and achieves the purpose of diverging the angle of the laser beam.
  • the diversity of the divergence angle can cause the difference of the optical path difference of the light transmission. Different optical path differences lead to different phase changes, and the destruction occurs.
  • the conditions of interference thus reducing the degree of coherence of the laser and the speckle effect of the laser source application, achieve the purpose of dissipating the plaque.
  • Embodiment 1 of the present invention performs the dissipation speckle by using a combination of a conical mirror and a diffusion sheet, and can fundamentally change the characteristics of the laser Gaussian-type energy distribution, thereby effectively eliminating the Gaussian-type distribution of the laser beam itself.
  • the coherence, the number of optical components used in the optical path is small, the optical structure is simple, and it is easy to popularize and apply.
  • the constricted component 2 can also adopt a large convex lens, and the apex of the conical mirror 3 is located at a focal length of the convex lens of the one piece, as shown in the figure. 7 is shown.
  • the refraction of light at the apex of the cone angle of the conical mirror is very obvious, and the light emitted from the vertex is in a divergent state.
  • the apex of the conical mirror 3 is located at a focal length position of the convex lens, more rays condensed by the convex lens can pass through the apex of the conical mirror 3, so that more beams can be scattered more strongly.
  • the energy distribution of the beam the vertical axis represents the energy distribution intensity of the beam
  • the horizontal axis represents the divergence angle formed by the optical axis of 0 degrees or the degree of divergence of the beam. Comparing Fig. 5 and Fig. 7, it can be seen that the proportion of the beam energy at the large divergence angle away from the optical axis in Fig. 7 is increased, and the energy intensity of the beam at 0 degree and the divergence angle of the optical axis attachment is further reduced, so that the same incident angle, the same phase, and the same vibration The reduction of the beam energy in the direction and the like is even more inferior to that in Embodiment 1, which is more advantageous for the decoherence or dissipation of the laser.
  • the diffuser 3 is also provided with a diffusion sheet 4, which is preferably a moving diffusion sheet, which can be used for each type of Bessel-type beam.
  • a diffusion sheet 4 which is preferably a moving diffusion sheet, which can be used for each type of Bessel-type beam. Beam loop for further Diffusion, enhance the diversity of the divergence angle, further reduce the spatial coherence of the laser beam, thereby achieving the purpose of reducing the laser coherence and the speckle effect of the laser source.
  • Embodiment 3 of the present invention provides a two-color laser light source, and the laser light-scattering light path described in Embodiment 1 is applied to a two-color laser light source architecture.
  • the two-color laser light source includes a blue laser 11 and a red laser 12, respectively emitting a blue laser and a red laser, and the blue laser and the red laser may be one or more groups, respectively, and the two may be juxtaposed.
  • the arrangement may also be arranged vertically.
  • the volume of the combined optical path and the complexity of the heat dissipation structure may be comprehensively selected; and the fluorescent wheel 3 is disposed in the blue laser exiting light path, including the fluorescent region (in the figure) Not shown) and a transmissive region (not shown), the fluorescent region is provided with a green phosphor for excitation by a blue laser to produce green fluorescence, and a transmissive region for transmitting the blue laser.
  • the blue laser 11 emits a blue laser light, and according to the rotation sequence, a part of the blue laser light is incident on the phosphor region of the fluorescent wheel 3, and the fluorescent wheel is excited to generate green light of one of the three primary colors, part of the blue light.
  • the color laser passes through the transmission region of the fluorescent wheel to produce blue light of one of the three primary colors.
  • the laser spot area emitted from the laser is large, in order to improve the excitation efficiency of the laser to the fluorescence, and to improve the transmission efficiency of the laser in the optical component, it is necessary to focus the laser spot emitted by the laser. Zooming out, a small spot of high energy density is formed and hits the phosphor of the fluorescent wheel 3. Therefore, the blue laser light emitted from the blue laser 11 needs to be focused by the first focus lens group 27 to form a small laser spot.
  • the first focusing lens group 27 may include two convex lenses as shown in FIG.
  • the convex lens surface set close to the laser is larger, and is used for comprehensively receiving the spot directly emitted by the laser, and the convex lens surface disposed close to the fluorescent wheel is small, and is used for focusing the spot after being focused by the first convex lens. Secondary focus, speed up the reduction of the spot area.
  • the first focusing lens group 27 may also include a telescope system consisting of a convex lens and a concave lens, and a convex lens that first shrinks the laser beam and then focuses.
  • the transmissive fluorescent wheel is used, and the phosphor of the fluorescent wheel 3 is disposed on the transparent substrate or by fluorescence.
  • Powder and inorganic materials, such as ceramics, are mixed and sintered to form a phosphor plate that is transparent and allows light to pass through.
  • a high transparent blue anti-green coating is arranged on the outside of the phosphor layer, due to the exiting side of the excited fluorescence The direction is along all directions.
  • the high transparent blue anti-green coating can cause the green fluorescent light to be reflected and emerge from the back side of the fluorescent wheel in the direction in which the blue laser is incident, thereby During the rotation of the fluorescent wheel 3, the blue laser light and the green fluorescent light can be sequentially output in accordance with the order.
  • the circuit design of the blue laser is omitted, and the circuit design usually includes a focusing lens, a plane mirror, etc., thereby saving the number and kind of use of the optical lens.
  • a collimating lens group 28 is disposed on the back of the fluorescent wheel 3 for collimating the diverging blue laser and the green fluorescent light. Parallel or nearly parallel beam output.
  • the collimating lens group 28 typically includes two convex lenses or a piece of hyperspherical lens.
  • the collimated blue laser light and green fluorescent light reach the light combining member 4, and are combined with the red laser light.
  • the dissipative spot light path is specifically set for the red laser optical path, and is used for the red color.
  • the laser dissipative spot treatment reduces the effect of the use of the red laser on the speckle degradation of the entire two-color laser source.
  • the red laser light is sequentially incident on the conical mirror 23 and the diffusion sheet 24 through the constricting member 21, wherein the conical mirror 23 and the diffusion sheet 24 are dissipated.
  • the core component of the plaque through the conical mirror to the homogenization shaping of the red laser Gaussian distribution, becomes a Bessel-like distribution, forming a plurality of beam loops, and the original relatively concentrated beam is broken up and greatly weakened.
  • the portion of the beam that is located near the 0 degree optical axis to cause laser coherence is effective, which effectively reduces the spatial coherence of the laser beam.
  • the distance between the scattered beam rings increases beyond the coherence length, thus reducing the beam ring.
  • the laser acts to dissipate the plaque.
  • the disperse optical path structure of the red laser can also adopt the optical structure provided by Embodiment 2, that is, the red laser sequentially passes through a convex lens, and the conical mirror is disposed at a focal length of the convex lens.
  • the diffuser after the conical mirror, the conical mirror and the diffuser have the same functions as those of the optical structure in Embodiment 1, and will not be described here.
  • the difference is that the conical mirror is disposed at the focal length of the convex lens. , can make more light scatter through the apex of the cone mirror cone angle, but it may also cause a cone mirror The light energy is more, so the temperature is higher, and the heat dissipation performance of the system needs to be improved.
  • the red laser After the red laser passes through the dissipating spot, it also passes through the second focusing lens 25 to collimate the light beam diverged by the diffusing film 24, otherwise the optical spread of the diffused divergence beam becomes large, and the next optical component cannot be completely entered. Causes loss during the transmission of light energy.
  • the collimated red laser light also reaches the light combining member 4, and is combined with the blue laser light and the green fluorescent light.
  • the light combining member 4 is specifically a piece of dichroic mirror, which is capable of transmitting red light and reflecting blue light and green light by coating.
  • the red laser, the blue laser, and the green fluorescent light are combined to reach the light guiding member 5, and light collection is performed to provide illumination for the projection device optical machine.
  • the light guiding member is usually a light rod.
  • the light bar is used to modulate the three primary colors of the light source output to the DMD chip of the optical machine for modulation, and project it onto the screen to form an image. Since the light bar has a certain range of incident angles, the light beam whose divergence angle exceeds the incident angle range will not enter the light bar, resulting in waste of light energy. Therefore, the three primary color lights usually pass through the focusing lens before reaching the light guiding member to reduce Divergence angle.
  • a third focus lens 26 is provided for focusing the three primary colors, so that more light beams can satisfy the incident angle range of the light guiding member 5, and the brightness of the light source is improved.
  • the red laser 12 and the blue laser 11 are arranged side by side, and before the combining, the optical axis direction conversion of one of the optical paths is required, so that the blue laser and the red laser can be perpendicular to each other.
  • the direction of the optical axis is transmitted through one dichroic mirror in one way, and the light is combined in one way. Therefore, a mirror 22 is provided in the red laser beam path, and the mirror 22 can be a plane mirror. If the red laser 12 and the blue laser 11 are vertically disposed, the two laser propagation directions are perpendicular to each other, and the optical axis direction conversion is not required, and the use of the mirror component can be omitted.
  • the speckle effect of the human eye on the red laser is more sensitive than the blue laser, in the two-color laser source, the problem of the dissipating spot of the red laser is more necessary.
  • the Gaussian red laser is firstly used by the conical mirror.
  • the distribution law of the beam is changed, the beam is homogenized and shaped, and the distribution pattern of the original energy concentration becomes a distribution pattern with a certain divergence angle and the relative divergence angle energy is relatively homogenized, which greatly reduces the vicinity of the optical axis at 0 degree.
  • the part of the beam with strong laser coherence, and the diffusion of the diffuser is used to further increase the divergence of each beam.
  • the degree and divergence angle are randomly distributed.
  • the diversity of the divergence angle can cause the optical path difference of the light transmission. Different optical path differences lead to different phase changes, so the probability of the same phase or constant phase difference is greatly reduced, which destroys one of the interference conditions, thereby further reducing the coherence of the red laser, thereby reducing the red laser source and the two-color laser source. Apply the speckle effect of sputum.
  • the laser dissipating spot light path uses a combination of a conical mirror and a diffusing plate to perform the dissipating spot, by changing the laser beam.
  • the law of energy distribution increasing the diversity of the beam divergence angle to destroy the coherent conditions, can fundamentally change the coherence characteristics of the laser Gaussian distribution itself, and effectively reduce the spatial coherence of the laser beam.
  • the number of optical components used is small, and the optical components occupy a small volume, and the optical structure is simple, which is convenient for popularization and application.
  • the two-color laser light source architecture provided by the embodiment of the present invention adds a dissipating spot component to the red laser optical path, and dissipates the speckle before the combining, for the blue laser and the green fluorescent, by using a transmissive type.
  • the fluorescent wheel members are outputted in the same direction, and the three arrive at the same light combining member to perform light combining output to form three primary colors.
  • the light source architecture not only solves the speckle effect problem of the red laser, but also provides a high-quality laser illumination source, and also uses three optical components to combine and combine the three primary colors.
  • the light source structure is simple, the volume is small, and the laser is convenient. Miniaturization of equipment.
  • the fluorescent wheel 3 is a reflective fluorescent wheel. As shown in FIG. 10, the fluorescent light generated by the reflective fluorescent wheel is reflected by the aluminum substrate toward the blue light. The incident direction of the color laser is emitted in the opposite direction, and the light combining member 4 is placed in front of the fluorescent wheel 3.
  • the collimator lens group 28 In order to collimate the transmitted blue laser light and the reflected fluorescence, it is necessary to provide the collimator lens group 28 on both the front and back sides of the fluorescent wheel 3.
  • the blue laser light passes through the collimator lens group 28 on the back side of the fluorescent wheel, and then passes through a relay circuit, including a relay lens and a plane mirror, and the optical component 25 shown in FIG. 10 returns to the light combining member 4.
  • the light combining member 4 is a dichroic mirror, and through the coating, the blue-transparent red-green color is selected.
  • the blue laser light can be allowed to be transmitted first and irradiated to the surface of the fluorescent wheel, the green fluorescent powder is excited to emit green fluorescence, and the green fluorescent light is specularly reflected by the non-fluorescent region, and reaches the light combining member 4 in a direction opposite to the incident of the blue laser light. Reflected through the dichroic mirror.
  • the disperse spot light path disclosed in Embodiment 1, or Embodiment 2 can be used. After the dissipative spot light path, the red laser light reaches the light combining member 4, and the transmission effect of the light combining member 4 is performed. The focus lens is reached to reduce the divergence angle.
  • the process of dissipating the optical path of the red laser is also the same as that of Embodiment 1 or Embodiment 2, and the same content will not be described again.
  • the reflective fluorescent wheel needs to be designed for the blue laser, the conversion effect of the fluorescence is relatively high, because the current transmissive fluorescent wheel is in the process of fluorescence excitation.
  • Embodiment 5 of the present invention provides a specific three-color laser light source architecture, which can perform the scatter spot based on the scatter spot light path described in Embodiment 1 or 2.
  • the three-color lasers 11, 12, 13 respectively emit red, blue and green lasers, wherein the three-color lasers are combined by two dichroic films 21, 22, respectively, only one of which is given in this example.
  • other light combining elements such as a light combining mirror may be used, and the present invention is not limited thereto.
  • the dichroic sheet 21 realizes red laser transmission by coating, blue laser reflection, and the dichroic film 22 realizes transmission of red laser and blue laser by coating, reflection of green laser, and thus through two dichroism
  • the combined light processing of the sheet forms a three-way color laser to form one output light.
  • the combined output light of the combined light first passes through the constricting member 23, specifically, a telescope system consisting of a convex lens and a concave lens, and the beam area is reduced so that the spot can pass through the rear tapered portion.
  • Mirror 3 components for improved optical processing efficiency.
  • the combined light of the three-color laser is combined with the diffuser 3 and the diffuser 4 to perform the scatter, and the action process and the embodiment thereof
  • the collection component - the incident angle ⁇ of the light bar is added. If the laser beam splitting angle satisfies the incident angle of the light rod If required, it is possible to directly enter the light bar without adding a converging member such as a convex lens or a convex lens group.
  • the distribution law of the combined laser beam is changed by using a conical mirror.
  • the Gaussian beam is homogenized and shaped, and the distribution pattern of the original energy concentration becomes a distribution pattern with a certain divergence angle and the relative divergence angle energy is relatively homogenized, which greatly weakens the laser coherence near the 0 degree optical axis.
  • the beam portion, and the diffusion of the diffusion sheet further increases the divergence degree and the divergence angle of each laser beam, and superimposes the scattering effect of the laser Gaussian beam with the cone mirror, and finally the beam can be achieved.
  • the diversity of divergence angles can cause the optical path difference of light transmission, different optical path differences lead to different phase changes, and the conditions of interference are destroyed, thereby further reducing the coherence of the laser light source.
  • the speckle effect of the three-color laser source application has a significant improvement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

La présente invention a trait à un chemin d'optique d'une tache laser dispersée. Grâce à l'utilisation d'une lentille conique (3, 23) et d'un élément de diffusion (4, 24), sur un chemin optique de trajectoire de sortie de laser, la présente invention permet l'homogénéisation et la formation d'un faisceau laser gaussien, ce qui affaiblit considérablement une partie de faisceau ayant un axe optique proche de 0 degré qui provoque une cohérence de faisceau laser élevée, et, en association avec un effet de diffusion d'un élément de diffusion (4, 24), une diversité d'angles de divergence de faisceau est formée, ce qui réduit davantage la cohérence d'espace laser et résout le problème de la granularité lors de l'utilisation d'une source de lumière laser. La présente invention se rapporte au domaine technique de l'affichage laser.
PCT/CN2016/075911 2015-10-08 2016-03-09 Chemin optique d'une tache laser dispersée WO2017059656A1 (fr)

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CN201510643217.9A CN106569378B (zh) 2015-10-08 2015-10-08 一种激光消散斑光路及双色激光光源、三色激光光源
CN201510643217.9 2015-10-08

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CN108919595B (zh) * 2018-06-19 2021-04-30 青岛海信激光显示股份有限公司 一种三色激光光源和激光投影电视
CN109270704B (zh) * 2018-11-21 2020-10-23 四川长虹电器股份有限公司 一种动态的用于激光消散斑的光源系统
CN110031979A (zh) * 2019-05-21 2019-07-19 中国工程物理研究院流体物理研究所 光斑匀化扩束方法及装置
CN112255871B (zh) 2019-07-02 2023-08-04 深圳光峰科技股份有限公司 光源装置，包括该光源装置的放映设备和3d设备
CN110673431A (zh) * 2019-10-18 2020-01-10 成都航天科工微电子系统研究院有限公司 一种高流明光引擎的光路系统
CN111203651B (zh) * 2020-01-15 2021-06-22 北京理工大学 空间整形飞秒激光在透明材料内部加工计算全息图的方法
CN113960866B (zh) * 2020-07-21 2023-08-08 青岛海信激光显示股份有限公司 激光光源及激光投影设备
CN112731750B (zh) * 2020-12-31 2022-11-04 杭州中科极光科技有限公司 一种激光光源及激光显示系统
CN114721161B (zh) * 2021-01-05 2024-04-05 台达电子工业股份有限公司 激光光斑消除装置及其操作方法
CN115388348A (zh) * 2021-05-19 2022-11-25 深圳市绎立锐光科技开发有限公司 照明装置

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