WO2017059657A1 - 一种激光消散斑光路及双色激光光源、三色激光光源 - Google Patents

一种激光消散斑光路及双色激光光源、三色激光光源 Download PDF

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Publication number
WO2017059657A1
WO2017059657A1 PCT/CN2016/075920 CN2016075920W WO2017059657A1 WO 2017059657 A1 WO2017059657 A1 WO 2017059657A1 CN 2016075920 W CN2016075920 W CN 2016075920W WO 2017059657 A1 WO2017059657 A1 WO 2017059657A1
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Prior art keywords
laser
light
conical mirror
light source
color
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PCT/CN2016/075920
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English (en)
French (fr)
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 WO2017059657A1 publication Critical patent/WO2017059657A1/zh

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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 multi-color laser light source application.
  • the present invention firstly provides a laser dissipating spot light path, comprising a laser, emitting a laser, and further comprising a first conical mirror, a diffusion sheet and a second conical mirror arranged in sequence along the laser output optical path; wherein a conical mirror for homogenizing and shaping the laser beam, the diffusion sheet for diffusing the laser beam after being homogenized and shaped by the first conical mirror, the second conical mirror being used for diffusing The laser beam is collected and homogenized twice.
  • first conical mirror and the second conical mirror are both conical lenses.
  • the diffusion sheet performs a rotating or translational motion.
  • the laser dissipating spot light path further includes a constricting component for shrinking the laser beam and then entering the first conical mirror.
  • the beam reducing component comprises a telescope system consisting of a piece of convex lens and a piece of concave lens.
  • the first conical mirror is disposed opposite to the second conical mirror.
  • 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 exciting green fluorescence by a blue laser, and a transmissive region for transmitting the blue laser, wherein the fluorescent wheel sequentially outputs blue laser and green fluorescence according to the sequence.
  • the blue laser and the green fluorescent light are passed through the collimating lens group to reach the light combining member; and the red laser light reaches the light combining member through the dissipating optical path, and at least the first conical mirror, the diffusion sheet and the second cone are disposed in the dispersing optical path a first conical mirror for homogenizing and shaping the laser beam, the diffusion sheet for diffusing the laser beam that has been homogenized and shaped by the first conical mirror, the second cone
  • the mirror is used to collect and dim the diffused laser beam; the blue laser, the green fluorescent light and the red laser are combined and output to the light guiding member.
  • the first conical mirror and the second conical mirror are conical lenses.
  • 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 convoluting the red laser beam into the first conical mirror.
  • the first conical mirror is disposed opposite to the second conical mirror.
  • 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 divergence 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 dissipative spot light path can disperse a Gaussian-type distributed laser beam into a Bessel-like beam by using a first conical mirror in the laser beam path and utilizing the optical characteristics of the conical mirror.
  • the homogenization of the laser beam changes the distribution of the Gaussian beam energy at 0 degrees or near the optical axis.
  • the energy of the laser beam near 0 degree and the optical axis is greatly reduced, and the beam angle is the same, phase or
  • the constant phase difference is the main reason for the strong spatial coherence of the laser.
  • the spatial coherence of the laser beam is also reduced.
  • the same energy forms multiple divergence angles and divergence angles.
  • the relatively uniform distribution, as well as the energy distribution of the entire laser beam is dominated by beam energy at multiple divergence angles.
  • the laser beam that is homogenized can be further diffused, and the divergent angle beams of the Bezier-type beam can be further diffused to increase the divergence angle.
  • the randomness which enhances the degree of divergence, can be combined with the scattering effect of the first cone mirror on the laser beam to form a diversity of the divergence angle of the laser beam, and the diversity of the divergence angle can cause the optical path difference of the light transmission. Difference, 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 conditions of interference, which reduces the degree of coherence of the laser beam and the dispersion of the laser source. Spot effect.
  • the diffuser pair divergence angle The random distribution effect plays a certain role in homogenizing the divergence angle distribution, so that the difference between the large divergence angle and the 0 degree beam energy distribution is reduced.
  • the diffused laser beam is collected and secondarily homogenized, so that the energy of the beam distributed at an angle of 0 degrees and the optical axis and the beam having each divergence angle are uniformly distributed.
  • the state increases the uniform distribution of the beam of the entire laser beam at various angles.
  • the laser beam after the second homogenization has a plurality of divergence angles, and the divergence can be performed by the diversity principle of the divergence angle, and the beam distribution at each angle after passing through the first conical mirror will be compared.
  • the energy ratio of the light beam distributed around 0 degrees and near the optical axis is improved, which is beneficial to improve the light processing efficiency of the laser beam passing through the optical component, and in particular, can prevent the energy ratio of the large-angle diverging beam from being too high, thereby entering the light collecting member.
  • the light loss of the crucible increases the brightness of the laser source.
  • the laser dissipating spot light path performs the dissipating spot by using a combination of two conical mirrors and a diffusing film, and can fundamentally change the characteristics of the laser Gaussian energy distribution, thereby increasing the laser light.
  • the divergence angle of the beam is homogenized for the energy distribution of the beam at 0 degree and near the optical axis and at the large divergence angle, which can balance the dissipating effect of the laser and the brightness enhancement of the laser light source, and has a high practicality.
  • the technical solution of the present invention further provides a two-color laser light source, including a blue laser light source and a red laser light source, by using the above-mentioned dissipative spot light path for the red laser to dissipate the spot, so that the red laser can pass through two cone mirrors.
  • the interaction with the diffuser fundamentally changes the characteristics of the laser Gaussian energy distribution, which increases the divergence angle of the laser beam, and homogenizes the energy distribution of the beam at 0 degree and near the optical axis and at the large divergence angle.
  • the ability to dissipate the red laser beam while reducing the light loss during the propagation due to the increase in the proportion of the beam with a large angle of divergence is beneficial to ensure the brightness of the red laser. Since the human eye is more sensitive to the speckle effect of the red laser, reducing the degree of coherence of the red laser also reduces the speckle effect of the two-color laser source, thereby achieving the purpose of dissipating the speckle of the two-color laser source, and simultaneously reducing The light loss of the red laser is also beneficial to improve the brightness 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 outputted by a fluorescent wheel member according to the order, and then the red laser after the dissipative spot is used.
  • 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 combining light, and disperses the spot light path by the two cone mirrors and the diffusion sheet, and refers to the cone mirror.
  • the three-color laser light source provided by the technical solution of the present invention can effectively dissipate the speckle and reduce the brightness loss of the laser light source, thereby providing 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 first conical mirror in 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 showing energy distribution of a laser beam after passing through a second conical mirror in Embodiment 1 of the present invention.
  • FIG. 8 is a schematic structural diagram of a two-color laser light source according to 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 view of a three-color laser light source according to Embodiment 4 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 the effect of focusing convergence, but passes through the apex E of the cone. The emitted light diverges 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.
  • the first conical mirror 3, the diffusion sheet 4, and the second conical mirror 5 are sequentially disposed along the laser exiting optical path in the dissipating spot light path.
  • the first conical mirror 3 is used for homogenizing and shaping the laser beam
  • the diffusion sheet 4 is used for diffusing the laser beam after being homogenized and shaped by the first conical mirror
  • the second conical mirror is used for diffusion
  • the laser beam is collected and homogenized twice.
  • the diverging spot light path further includes a constricting member 2 for the laser beam for the large spot.
  • the beam is reduced to reduce the spot area so that the beam can pass through the subsequent optical component-cone mirror transmission, reducing the loss of light energy during transmission and improving the shaping efficiency of the laser beam by the cone.
  • the contracting member 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 first conical mirror 3 and the second conical mirror 5 may specifically be conical lenses, and the optical components have a circular cross section, and are convenient for receiving circular or elliptical or square laser spots. , and low processing costs
  • the first conical mirror disperses the laser beam, and the second conical mirror is diverged.
  • the beams are collected so that the first conical mirror and the second conical mirror are oppositely disposed.
  • the selection of the first conical mirror and the second conical mirror It is not specifically limited, and may be the same as the size or the shape, depending on the degree of shaping of the beam in the optical path.
  • 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 Bezier-like beam
  • the Bezier-type beam is a plurality of concentric beam rings, and different beam rings are in the process of transmission.
  • the difference in optical path difference and phase difference is larger than the coherence length (coherence length refers to the maximum optical path difference that the light source with a certain spectral width can interfere with), thereby reducing the distance between multiple beam rings to some extent.
  • the probability of interference 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 relative homogenization energy distribution of the 0 degree and multi-angle beams shown in Fig. 5, and the energy distribution of the entire laser beam is mainly the beam energy of multiple divergence angles.
  • Fig. 3A the original Gaussian beam energy distribution becomes the relative homogenization energy distribution of the 0 degree and multi-angle beams shown in Fig. 5
  • the energy distribution of the entire laser beam is mainly the beam energy of multiple divergence angles.
  • the energy intensity of the beam at a divergence angle of 0 degrees or near the optical axis becomes weaker, the ratio decreases, and a beam energy distribution curve of a plurality of divergence angles appears, and the beam of each divergence angle is in the entire beam.
  • the proportion of energy occupied increases, and the beam energy at each divergence angle is relatively uniform. That is, after passing through the first conical mirror 3, due to the divergence of the cone angle to the beam, the beam energy distribution at an angle of 0 degrees or near the optical axis is no longer too concentrated, but the energy of the portion of the beam is greatly weakened.
  • the energy ratio is drastically reduced, and the beam angle is the same, and the phase or phase difference is constant, which is the main reason for the strong spatial coherence of the laser.
  • the spatial coherence of the laser beam also decreases.
  • the same angle forms a beam with multiple divergence angles, and the difference in phase difference between the multiple divergence angle beams is enhanced, and the probability of interference is greatly reduced, so that the spatial coherence of the entire laser light source becomes weak.
  • the diffusion sheet 4 after the diffusion sheet 4 is located behind the first conical mirror 3, the diffusion of the Bessel-type beam emitted through the conical mirror 3 can enhance the effect of decoherence.
  • the diffusion sheet 4 is further provided after the first 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 first conical mirror 3, increasing the divergence angle of the laser beam and forming a plurality of divergence angles, and the diversity of the divergence angle can cause the optical path of the light transmission Poor, the optical path difference is the difference between the optical paths of the two beams reaching a certain point, and 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.
  • the optical path difference 2 ⁇ / ⁇ ⁇ optical path difference ( ⁇ is the wavelength in vacuum, in the present embodiment, the same laser, ⁇ is the same)
  • ⁇ 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 random distribution effect of the diffusion sheet 4 on the divergence angle plays a certain role in homogenizing the divergence angle distribution, so that the difference in the beam energy distribution contrast between the large divergence angle and the 0 degree is reduced.
  • FIG. 6 the energy distribution of the laser beam after passing through the diffusion sheet 4 is compared with FIG. 5 , and 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 light passing through each optical lens. Efficiency, especially for the collection of light rods in the rear-end optomechanical part.
  • the divergent light at a large angle far from the optical axis is lost because it is larger than the incident angle range, and cannot be completed. collect. 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 diffused laser beam also passes through the second conical mirror, and the beam is distributed at an angle of 0 degrees and the optical axis due to the second conical mirror collecting and secondary homogenizing of the diffused laser beam. And the energy of the beam with each divergence angle is uniformly distributed, which improves the uniform distribution of the beam of the entire laser beam at various angles.
  • FIG. 7 the energy distribution of the laser beam after passing through the second conical mirror, as compared with FIG. 5 and FIG. 6 , the optical energy of the laser beam at an angle of 0 degrees or near the optical axis increases, and the distribution ratio increases.
  • the beam of light whether it is a 0 degree optical axis or a divergent beam with multiple divergence angles, has a Gaussian distribution, but the energy of each beam is balanced and evenly distributed, so that the uniform distribution of the entire laser beam at various angles is improved.
  • the laser beam that has been subjected to the second homogenization has a plurality of divergence angles, and the divergence can be performed by the diversity principle of the divergence angle, similarly, after passing through the first conical mirror
  • the beam distribution at various angles increases the energy ratio of the beam distributed around 0 degrees and the optical axis, which is beneficial to improve the light processing efficiency of the laser beam passing through the optical component. This is because the general optical component is disposed at its center. It will try to be along the optical axis, so that most of the light can be processed through the optical components. For example, compared to 0 degrees, the light is incident on the convex lens along the optical axis.
  • the light with a divergence angle of 5 degrees may follow the edge of the convex lens. Incident, it may not be able to be normally concentrated due to processing of the edge of the convex lens or structural occlusion, resulting in a decrease in optical processing efficiency, and this measure of reducing the energy distribution of the large-angle divergent angle beam can especially prevent the energy ratio of the large-angle divergent beam from being excessive.
  • the incident angle of the rod is usually set to a specific range, and the range of the incident angle of the light rod is also related to the optical parameters of the lens, and the adjustable range is small.
  • the light beam with the angle of 0 degree and the angle near the optical axis and the light beam with multiple divergence angles are Gaussian, and are in a uniform state, which is beneficial to reduce the light loss and improve the brightness of the laser light source.
  • the divergence angle is large, causing the optical expansion amount to become large, which is not conducive to all entering the next optical.
  • Components, light converging components, such as convex lenses, can be placed in the optical path to converge the beam to meet the angle of incidence, especially for the range of incident angle of the light bar, to reduce the divergence angle of the laser beam after shaping, so that as many beams as possible Entering the light bar improves the light collection efficiency and helps to increase the brightness of the laser illumination source.
  • the diffusion beam and the second conical mirror cooperate to form a laser beam from a Gaussian type distribution in the vicinity of 0 degrees and the optical axis to a plurality of divergence angles.
  • a method of uniformly distributing the beams with multiple divergence angles and 0 degrees and angles near the optical axis which increases the divergence angle of the laser beam, and the energy distribution of the beam at 0 degree and near the optical axis and the large divergence angle.
  • Homogenization which can balance the dissipating effect of the laser and the brightness enhancement of the laser light source, has high practical value.
  • Embodiment 2 of the present invention provides a two-color laser light source, and the laser light-dissipating spot 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
  • the blue laser and the red laser may be one or more groups, respectively.
  • the arrangement may be arranged side by side or 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 optical path, including the fluorescent area. (not shown in the drawing) and a transmissive area (not shown), the fluorescent region is provided with a green phosphor for excitation by a blue laser to generate 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 excite the laser.
  • the spot of light is focused and reduced, and a small spot of high energy density is formed to hit 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 outside the phosphor layer.
  • the high transparent blue anti-green coating can be The green fluorescence is reflected and emitted from the back surface of the fluorescent wheel in the direction in which the blue laser light is incident, so that the fluorescent wheel 3 can sequentially output the blue laser light and the green fluorescent light in accordance with the order of the rotation.
  • 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 type of optical lenses used.
  • 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 the green fluorescent light reach the light combining member 4, and are combined with the red laser light.
  • the dissipative optical path is specifically set for the red laser optical path, and is used for the red
  • 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 sequentially passes through the ablation beam member 21 and then sequentially enters the first conical mirror 23, the diffusion sheet 24, and the second conical mirror 25, and passes through the first Conical mirror 23 on red
  • the homogenization of the Gaussian energy distribution of the color laser becomes a Bessel-like distribution. Since the energy distribution of the beam at an angle of 0 degrees or near the optical axis is no longer too concentrated, the energy of the part of the beam is greatly weakened, and the energy is weakened.
  • the ratio is sharply reduced, and the beam angle is the same, and the phase or phase difference is constant, which is the main reason for the strong spatial coherence of the laser.
  • the spatial coherence of the laser beam also decreases.
  • the ⁇ forms a beam with multiple divergence angles, and the difference in phase difference between the multiple divergence angle beams is enhanced, and the probability of interference is greatly reduced.
  • the diffusion sheet 24 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 first conical mirror 23, increasing the divergence of the laser beam and forming a plurality of divergence angles, and the diversity of the divergence angle can bring about the destruction of the phase difference. Constant interference conditions allow the red laser to act as a dissipative spot.
  • the energy of the beam distributed at an angle of 0 degrees and the optical axis and the beam having each divergence angle are uniform
  • the distribution state increases the uniform distribution of the beam of the entire laser beam at various angles. Therefore, the laser beam that has been subjected to the secondary homogenization has a plurality of divergence angles, and the divergence can be performed by utilizing the diversity principle of the divergence angle, and the light loss which may be caused by the beam of the large divergence angle during the light transmission can be reduced. Conducive to improve the brightness of the red laser.
  • the 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.
  • the second focus lens 26 is disposed to focus 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 member can be omitted.
  • the problem of the speckle of the red laser is more necessary.
  • the coherence of the red laser can be alleviated, thereby reducing the red laser.
  • the light source and the two-color laser source apply the speckle effect of the crucible to achieve the purpose of dissipating the speckle, and the same can reduce the light loss of the red laser, achieving the dual purpose of dissipating the speckle and improving the brightness of the laser source.
  • the laser scatter spot light path uses a combination of a double cone mirror and a diffusion sheet to perform scatter, by changing the laser
  • the distribution of beam energy increasing the diversity of beam divergence angles to destroy coherent conditions, can fundamentally change the coherence characteristics of the laser Gaussian distribution itself, effectively reduce the spatial coherence of the laser beam, and reduce the dissipative process.
  • the light loss of the laser is a combination of a double cone mirror and a diffusion sheet to perform scatter, by changing the laser
  • the distribution of beam energy increasing the diversity of beam divergence angles to destroy coherent conditions, can fundamentally change the coherence characteristics of the laser Gaussian distribution itself, effectively reduce the spatial coherence of the laser beam, and reduce the dissipative process.
  • the light loss of the laser is a combination of a double cone mirror and a diffusion sheet to perform scatter, by changing the laser
  • the distribution of beam energy increasing the diversity of beam divergence angles to destroy coherent conditions, can fundamentally change the coherence characteristics of the laser Gaussian distribution itself, effectively reduce
  • the two-color laser light source architecture provided by the embodiment of the present invention adds a dissipative component to the red laser optical path, and dissipates the scatter spot before the merging, and uses a transmissive type for the blue laser and the green fluorescent light.
  • 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. 8, 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.
  • a collimating lens group 28 is provided.
  • the blue laser light passes through the collimating 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 member 25 shown in FIG. 9 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 can be used. After the dissipative spot light path, the red laser light reaches the light combining member 4, and reaches the focus lens through the transmission of the light combining member 4 to perform divergence. The corner is reduced.
  • 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.
  • the accumulation of heat significantly affects the conversion efficiency of fluorescence and has a certain influence on the brightness of the light source.
  • Embodiment 4 of the present invention provides a three-color laser light source which can be used to dissipate the scatter spot based on the astigmatism light path described in Embodiment 1.
  • an exemplary three-color laser light source structure is proposed. As shown in FIG. 10, the three-color lasers 11, 12, and 13 respectively emit red, blue, and green lasers. The three-color lasers are combined by the two dichroic films 21 and 22, respectively. In this example, only one type of light combining is given, and 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 ablation member 23, specifically, may be a piece of convex lens and A telescope system consisting of a concave lens reduces the beam area so that the spot can pass through the rear tapered mirror member, improving optical processing efficiency.
  • the light source structure diagram of the example of the present invention other optical components, such as a converging member, after passing through the second conical mirror are not shown, and are used to satisfy a large divergence angle after diffusion through the diffusion sheet.
  • the rear end light collecting member - the incident angle ⁇ of the light bar is added. If the divergence angle of the laser combined light beam satisfies the incident angle requirement of the light bar, it can be directly entered into 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 performed by using the first conical mirror. Change, homogenize and shape the Gaussian beam, and change the original energy concentration distribution into a distribution with a certain divergence angle and relatively uniform divergence angle energy, which greatly reduces the laser coherence near the 0 degree optical axis.
  • the stronger beam portion, and the diffusion effect of the diffusion sheet is used to further increase the divergence degree and the divergence angle of each laser combining light beam, and superimpose the scattering effect of the laser Gaussian beam by the first conical mirror.
  • the second cone mirror is used to collect the laser beam after the diffusion and the second homogenization shaping effect, so that the light beam distributed at an angle of 0 degrees and the optical axis can have various divergence.
  • the energy of the angle beam is evenly distributed, which improves the uniform distribution of the beam of the entire laser beam at various angles.
  • the degree of cloth can not only realize the diversity of the reflection angle of the laser beam, but also reduce the light loss during the light treatment caused by the excessive energy ratio of the large-angle divergent beam, and ensure the brightness of the laser source.
  • the three-color laser light source provided by Embodiment 4 of the present invention can not only have a good dissipating effect, but also has a high brightness and has high practical value.

Abstract

一种激光消散斑光路，通过在激光输出光路中依次设置第一锥形镜（3, 23）、扩散片（4, 24）和第二锥形镜（5, 25），能够对高斯型激光光束进行匀化整形，结合扩散片（4, 24）的扩散作用，形成激光光束发散角度的多样性，并利用第二锥形镜（5, 25）对发散的激光光束进行收集，最终形成0度光轴附近和各个发散角度的光束匀化分布的方式，通过光束发散角度多样性能够降低激光的空间相干性，同时，0度和各个发散角度的匀化分布能够防止大角度发散光束的能量比例过高而造成进入光收集部件时的光损，利于提高激光光源亮度，该激光消散斑光路能够兼顾激光的消散斑和激光光源的亮度提升。应用于激光显示技术领域。

Description

一种激光消散斑光路及双色激光光源、 三色激光光源
[0001] 相关申请的交叉引用
[0002] 本申请要求于 2015年 10月 8日提交中国专利局、 申请号为 201510643398.5、 发明 名称为 "一种激光消散斑光路及双色激光光源、 三色激光光源 "的中国专利申请的 优先权， 其全部内容通过引用结合在本申请中。
技术领域
[0003] 本发明涉及激光显示技术领域， 尤其涉及一种激光消散斑光路及双色、 三色激 光光源。
背景技术
[0004] 激光是一种高亮度， 方向性强， 发出单色相干光束的光源， 由于激光的诸多优 点， 近年来被逐渐作为光源应用于投影显示技术领域。 激光的高相干性带来了 激光投影显示吋的散斑效应， 所谓散斑是指相干光源在照射粗糙的物体吋， 散 射后的的光， 由于其波长相同， 相位恒定， 就会在空间中产生干涉， 空间中有 些部分发生干涉相长,有部分发生干涉相消,最终的结果是在屏幕上出现颗粒状 的明暗相间的斑点， 这些未聚焦的斑点在人眼看来处于闪烁状态,长吋间观看易 产生眩晕不适感， 更造成投影图像质量的劣化， 降低用户的观看体验。
[0005] 在实际应用的激光光源中， 激光光源种类越多， 散斑效应也越严重。 对于红蓝 激光器组成的双色激光光源， 人眼对于红色激光散斑效应的敏感程度高于对于 蓝色激光的， 因此红色激光光源的消散斑光路设计就显得尤为重要。
[0006] 现有技术中存在多种消散斑技术。 一种技术是采用振动的显示屏， 通过屏的振 动来减弱散斑斑点在人眼内的积分作用， 但是对于大尺寸屏幕控制来说并不实 用， 并且目前投影也朝向无屏化方向发展； 一种技术是利用多模光纤， 使相邻 光纤之间的长度大于光源的相干长度， 从而降低相干性， 但是光纤的体积大， 光在光纤中的传播路径长， 光能损耗也较大， 不适用当前小型化和高亮要求的 激光光源设计。 以及， 现有技术中还通过在激光光路中设置运动的散射片或者 扩散片进行消散斑， 但是效果有限。 技术问题
[0007] 本发明提供了一种激光消散斑光路和双色激光光源、 三色激光光源， 能够提高 激光的消散斑效果， 解决多色激光光源应用吋的散斑效应问题。
问题的解决方案
技术解决方案
[0008] 本发明是通过以下技术方案实现的：
[0009] 本发明首先提供了一种激光消散斑光路， 包括激光器， 发出激光， 还包括沿激 光输出光路依次设置的第一锥形镜、 扩散片以及第二锥形镜； 其中， 所述第一 锥形镜用于对激光光束进行匀化整形， 所述扩散片用于对经第一锥形镜匀化整 形后的激光光束进行扩散， 所述第二锥形镜用于对扩散后的激光光束进行收集 并二次匀化。
[0010] 进一步地， 所述第一锥形镜、 第二锥形镜均为圆锥透镜。
[0011] 进一步地， 所述扩散片做旋转或者平动运动。
[0012] 进一步地， 所述激光消散斑光路还包括缩束部件， 用于将激光光束进行缩束后 射入第一锥形镜。
[0013] 进一步地， 所述缩束部件包括由一片凸透镜和一片凹透镜组成的望远镜系统。
[0014] 进一步地， 所述第一锥形镜与第二锥形镜相对设置。
[0015] 本发明还提供了一种双色激光光源， 包括蓝色激光器和红色激光器， 分别发出 蓝色激光和红色激光； 荧光轮， 设置于蓝色激光出射光路中， 包括荧光区和透 射区， 该荧光区设置有绿色荧光粉， 用于受蓝色激光激发产生绿色荧光， 透射 区用于透射所述蓝色激光， 其中， 所述荧光轮根据吋序依次输出蓝色激光和绿 色荧光， 蓝色激光和绿色荧光经准直透镜组后到达合光部件； 以及， 红色激光 经消散斑光路后到达合光部件， 该消散斑光路中至少设置第一锥形镜、 扩散片 以及第二锥形镜， 其中， 所述第一锥形镜用于对激光光束进行匀化整形， 所述 扩散片用于对经第一锥形镜匀化整形后的激光光束进行扩散， 所述第二锥形镜 用于对扩散后的激光光束进行收集并二次匀化； 蓝色激光、 绿色荧光和红色激 光经合光后输出至导光部件。
[0016] 进一步地， 所述第一锥形镜、 第二锥形镜为圆锥透镜。 [0017] 进一步地， 所述扩散片做旋转或者平动运动。
[0018] 进一步地， 所述合光部件为二向色镜。
[0019] 进一步地， 所述消散斑光路还包括缩束部件， 用于将所述红色激光光束进行缩 束后入射所述第一锥形镜。
[0020] 进一步地， 所述第一锥形镜与所述第二锥形镜相对设置。
[0021] 进一步地， 所述蓝色激光、 绿色荧光和红色激光经合光后输出至导光部件之前 还经过会聚部件， 用于缩小所述合光后光束的发散角。
[0022] 以及， 本发明技术方案还提供了一种三色激光光源， 包括三色激光器， 发出红
、 绿、 蓝三种激光， 所述三种激光经过合光后经过上述方案的激光消散斑光路 进行消散斑。
发明的有益效果
有益效果
[0023] 本发明技术方案， 至少具有如下有益技术效果或者优点：
[0024] 本发明技术方案提供的激光消散斑光路， 通过在激光光路中设置第一锥形镜， 利用锥形镜光学特性， 能够将高斯型分布的激光光束打散形成类贝塞尔型光束 ， 对激光光束进行匀化整形， 改变了高斯型光束能量集中在 0度或光轴附近的分 布方式， 对 0度及光轴附近的激光光束能量大幅减弱， 而这部分光束角度相同， 相位或者相位差恒定， 是造成激光空间相干性强的主要原因， 随着这部分光束 的变少， 激光光束的空间相干性程度也随之减弱， 同吋形成具有多个发散角度 且各个发散角度的能量相对匀化的分布， 以及整个激光光束的能量分布以多个 发散角度的光束能量为主。
[0025] 以及通过设置在第一锥形镜后的扩散片， 能够对进行匀化后的激光光束进一步 扩散， 可以将类贝塞尔型光束的各种发散角度的光束进一步扩散， 增加发散角 度的随机性， 增强发散程度， 一方面能够与第一锥形镜对激光光束的打散作用 相结合共同形成激光光束发散角度的多样性， 而发散角度的多样性能够造成光 线传输的光程差差异， 不同的光程差导致不同的相位变化， 从而相位相同或者 相差恒定的概率就大大降低， 破坏了发生干涉的条件之一， 进而降低了激光光 束的相干程度和和激光光源应用吋的散斑效应。 另一方面， 扩散片对发散角度 的随机分布作用， 起到了一定的对各个发散角度分布进行匀化的作用， 使大发 散角度和 0度的光束能量分布对比的差异化减小。
[0026] 并且通过设置第二锥形镜， 对扩散后的激光光束进行收集并二次匀化， 使分布 在 0度及光轴附近角度的光束以及具有各个发散角度的光束的能量呈均匀分布状 态， 提高了整个激光光束在各个角度上光束的均匀分布程度。 一方面， 经过二 次匀化的激光光束具有多个发散角度， 能够利用发散角度的多样性原理进行消 散斑， 同吋， 相比于经过第一锥形镜后的各角度的光束分布， 将分布在 0度及光 轴附近的光束的能量比例进行了提升， 利于提高激光光束在穿过光学部件吋的 光处理效率， 尤其能够防止大角度发散光束的能量比例过高而造成进入光收集 部件吋的光损， 从而提高了激光光源的亮度。
[0027] 综上， 本发明技术方案提供的激光消散斑光路通过使用两片锥形镜和扩散片的 组合来进行消散斑， 能够从根本上改变激光高斯型能量分布的特点， 既增加了 激光光束的发散角度， 又对 0度及光轴附近与大发散角度的光束的能量分布进行 了匀化， 能够兼顾激光的消散斑效果和激光光源的亮度提升， 具有较高的实用
[0028] 本发明技术方案还提供了一种双色激光光源， 包括蓝色激光光源和红色激光光 源， 通过对红色激光采用上述的消散斑光路进行消散斑， 使红色激光能够经过 两片锥形镜和扩散片的共同作用从根本上改变激光高斯型能量分布的特点， 既 增加了激光光束的发散角度， 又对 0度及光轴附近与大发散角度的光束的能量分 布进行了匀化， 既能够对红色激光光束进行消散斑同吋还减少了由于大角度发 散角的光束比例的增加而可能带来的传播过程中的光损， 有利于保证红色激光 的亮度。 由于人眼对红色激光的散斑效应更为敏感， 降低了红色激光的相干程 度也就减轻了双色激光光源应用吋的散斑效应， 从而达到对双色激光光源消散 斑的目的， 同吋减小了红色激光的光损， 也有利于提升双色激光光源的亮度。
[0029] 以及， 本发明技术方案中， 蓝色激光入射荧光轮后激发出绿色荧光， 绿色荧光 和蓝色激光由一个荧光轮部件根据吋序依次输出， 再与经消散斑后的红色激光 、 蓝色激光和绿色荧光通过一个合光部件进行合光， 消散斑光路及合路和合光 部件少， 光学架构简洁， 并能够提供低散斑、 高亮度的激光照明光源。 [0030] 本发明技术方案提供的三色激光激光， 该三色激光光源经合光后形成一路光束 ， 并经上述两片锥形镜和扩散片组成的激光消散斑光路， 参考上述锥形镜和扩 散片组合消散斑的作用过程， 本发明技术方案提供的三色激光光源既能够有效 消散斑， 还能够减小激光光源的亮度损失， 从而提供低散斑、 高亮度的激光照 明光源。
对附图的简要说明
附图说明
[0031] 图 1为现有技术锥形镜光路传播示意图；
[0032] 图 2为类贝塞尔光束光斑分布示意图；
[0033] 图 3A为现有技术高斯型光束分布示意图；
[0034] 图 3B为高斯型光束光斑分布示意图；
[0035] 图 4为本发明实施例 1提供的激光消散斑光路示意图
[0036] 图 5为本发明实施例 1中经过第一锥形镜后的激光光束能量分布示意图；
[0037] 图 6为本发明实施例 1中经过扩散片后的激光光束能量分布示意图；
[0038] 图 7为本发明实施例 1中经过第二锥形镜后的激光光束能量分布示意图；
[0039] 图 8为本发明实施例 2提供的双色激光光源结构示意图；
[0040] 图 9为本发明实施例 3提供的双色激光光源结构示意图；
[0041] 图 10为本发明实施例 4提供的三色激光光源结构示意图。
本发明的实施方式
[0042] 为了使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明作 进一步地详细描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不 是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创 造性劳动前提下所获得的所有其它实施例， 都属于本发明保护的范围。
[0043] 在介绍本发明具体实施例之前， 首先介绍一下锥形镜的光学特性， 锥形镜具有 一个锥面和一个平面， 其中光线从平面一侧入射， 可用于产生可随着距离增加 直径、 但又保持一致环形厚度的非衍射环形光束。 如图 1所示， 当平行光束入射 至锥形镜平面一侧吋， 经锥面折射具有聚焦收敛的作用， 但是经过锥面顶点 E出 射的光线向多个方向发散， 从而将光束能量进行分散。 由于同吋对光束具有收 敛和发散的光学效果， 在锥形镜的出射方向会形成一个光束的菱形交叉区， 如 图 1所示的阴影部分， 当在此区域， 比如在图 1中所示的 XY平面进行成像观察吋 ， 可以观察到同心的多个环状光束， 如图 2所示意。 其中， 多个同心环状光束中 位于内层的光束或靠近光束环中心的光束能量较弱， 位于外层的光束环能量较 强， 图中用光束环的颜色深浅来示例说明光束环能量强度的对比情况。
[0044] 实施例 1
[0045] 本发明实施例 1提供了一种激光消散斑光路， 如图 4所示， 包括激光器 1， 可以 为一组或多组， 发出激光， 该激光器可以为蓝色激光器或红色激光器或绿色激 光器， 并不具体限定具体颜色。
[0046] 在消散斑光路中沿激光出射光路依次设置有第一锥形镜 3， 扩散片 4， 以及第二 锥形镜 5。 其中， 第一锥形镜 3用于对激光光束进行匀化整形， 扩散片 4用于对经 第一锥形镜匀化整形后的激光光束进行扩散， 第二锥形镜用于对扩散后的激光 光束进行收集并二次匀化。
[0047] 具体地， 由于激光器发出的激光光斑直径约在 60mm左右， 为提高激光光束的 传输效率和整形效率， 在该消散斑光路中还包括缩束部件 2， 用于将大光斑的激 光光束进行缩束， 减小光斑面积， 以使得光束能够全部通过后续的光学部件-锥 形镜中的传输， 减少光能在传输过程中的损失， 并提高锥形镜对激光光束的整 形效率。 在本发明实施例中， 缩束部件 2位于激光器 1和锥形镜 3之间。 在具体实 施中， 如图 4所示， 缩束部件 2可以是一片凸透镜和一片凹透镜组成的望远镜系 统， 经过望远镜系统后的激光光斑面积缩小， 进行了光束的缩束， 从而能够容 易地被下一光学镜片即锥形镜 3全部接收。
[0048] 在本发明实施例中， 第一锥形镜 3和第二锥形镜 5具体可以均为圆锥透镜， 其光 学部件截面为圆形， 便于接收圆形或椭圆形或方形的激光光斑， 且加工成本低
[0049] 在本发明实施例方案中， 由于第一锥形镜和第二锥形镜的作用不同， 具体地， 第一锥形镜是将激光光束打散， 第二锥形镜是对发散的光束进行收集， 因此第 一锥形镜和第二锥形镜相对设置。 以及， 对于第一锥形镜和第二锥形镜的选型 并不做具体限定， 可以大小面型相同， 也可以不同， 根据光路中对光束的整形 程度不同而定。
[0050] 如前所述， 根据锥形镜的光学特性， 当沿着透镜平面向锥面入射光束为高斯型 光束吋， 能够将高斯型激光光束转化为类贝塞尔型光束， 对激光光束的能量分 布进行匀化。 图 3A表示了高斯型光束的分布示意图， 能量集中在光轴附近， 即 0 度及光轴附近角度的光束能量占整个激光光束的绝大部分， 能量较为集中， 而 在同一种光源中， 光束的入射角度相同， 相位或相位差恒定， 这是造成激光空 间相干性强的主要原因。 图 3B表示了激光相干光源光斑的示意图， 光斑中心部 位颜色深， 光能量密度大， 因此相干性也最强。
[0051] 当激光光束经过第一锥形镜吋， 高斯型分布的光束被打散形成类贝塞尔型光束 ， 类贝塞尔型光束为多个同心光束环， 不同光束环在传输过程中的光程差和相 位差差异性较大， 超过了相干长度 （相干长度是指具有一定谱宽的光源能够发 生干涉的最大光程差） ， 从而在一定程度上降低了多个光束环之间的发生干涉 的概率。 以及， 圆锥透镜将部分通过锥形镜锥角顶点的光束打散， 增大了光束 的发散角的角度， 也增加了发散角度的多样性。 随着激光光束变成类贝塞尔型 光束环分布， 其能量分布也随之变化， 如图 5所示。 其中， 纵轴代表光束的能量 分布强度， 横轴代表与 0度光轴形成的发散角度或光束的发散程度。 对比图 3A可 知， 原高斯型的光束能量分布变成了图 5所示的 0度及多角度光束相对匀化的能 量分布， 以及整个激光光束的能量分布以多个发散角度的光束能量为主。 以及 ， 图 5中在 0度或者光轴附近角度发散角的光束所占的能量强度变弱， 比例减少 ， 出现了多个发散角度的光束能量分布曲线， 各个发散角度的光束在整个光束 中所占的能量比例增加， 且各发散角度的光束能量相对匀化分布。 也就是， 经 过第一锥形镜 3后， 由于锥角对光束的发散作用， 处于 0度或光轴附近角度的光 束能量分布不再过于集中， 而是对该部分光束的能量进行大幅消弱， 能量比例 急剧降低， 而这部分光束角度相同， 相位或者相位差恒定， 是造成激光空间相 干性强的主要原因， 随着这部分光束的变少， 激光光束的空间相干性程度也随 之减弱， 同吋形成多发散角度的光束， 而多发散角度光束之间的相位差差异性 增强， 发生干涉的概率大大降低， 从而整个激光光源的空间相干性变弱。 [0052] 在本发明实施例中， 扩散片 4位于第一锥形镜 3后， 用于对经锥形镜 3出射的类 贝塞尔型光束进行扩散， 能够起到增强消相干的效果。 这是因为， 虽然类贝塞 尔型光束具有多个同心光束环， 光束环之间的距离超过了光束的相干长度， 不 利于各个光束环的光束之间发生干涉， 但是每个光束环内的光束之间仍在相干 长度范围之内， 从而仍具有较强的相干特性。 因此， 在本实施例中， 在第一锥 形镜 3后还设置有扩散片 4。 优选地， 扩散片 4为运动的扩散片， 可以是旋转运动 ， 也可以是平动运动， 由于运动的扩散片能够增大对激光光束的发散程度和发 散角度的随机分布， 增加激光光束的随机空间相位， 相比于固定设置的扩散片 ， 消散斑效果更佳。
[0053] 运动的扩散片需要通过驱动装置驱动， 驱动装置可以利用现有技术实现， 在本 发明实施例中不做详细说明。
[0054] 扩散片 4在运动过程中， 起到均匀扩散的作用， 因此能够对类贝塞尔型光束的 各个光束环进行分别扩散， 进一步增大各个光束环光的发散角以及发散角度的 随机性， 通过与第一锥形镜 3对激光高斯型光束的打散效果相叠加， 增加了激光 光束的发散角度， 并形成多个发散角度， 而发散角度的多样性能够造成光线传 输的光程差， 所谓光程差是指两束光到达某点的光程之差值， 是表明干涉条纹 性质的量。 在本发明实施例中， 同一光源发出的不同发散角度的两束光， 在同 一介质中传播， 其光程差可简单的由几何路径差推导得到。 举例来说， 0度光线 和 5度发散角度的光线到达同一光学镜片 （视作同一点） 吋， 5度光线所经历的 几何路径大于 0度光线的， 从而具有一定的光程差， 根据相位差 =2π/λ χ光程差 （ λ为真空中的波长， 在本实施例中， 为同种激光， λ相同） ， 不同的光程差导致不 同的相位变化， 从而相位相同或者相差恒定的概率就大大降低， 破坏了干涉的 条件之一， 从而减轻了激光的相干程度和激光光源应用吋的散斑效应。
[0055] 同吋， 扩散片 4对发散角度的随机分布作用， 起到了一定的对各个发散角度分 布进行匀化的作用， 使大发散角度和 0度的光束能量分布对比的差异化减小。 如 图 6所示的经过扩散片 4后的激光光束能量分布示意图， 对比图 5可知， 两侧发散 角度的光束能量有所降低， 0度光轴附近的光束能量有所提升。 在实际应用吋， 期望靠近光轴附近的光能量较强， 便于提高光束在通过各个光学镜片中的光学 效率， 尤其利于后端光机部分的光棒收集， 由于光棒收集光束吋入射角范围的 限定， 对于偏离光轴较远的大角度的发散光会因为大于入射角范围被损失掉， 无法完成收集。 因此本发明技术方案中通过扩散片的再次扩散匀化作用， 通过 在一定程度上减弱大发散角度光束的能量分布， 从而减少进入光棒吋的光损， 利于提高光源亮度， 通过对 0度光轴附近光束能量的提升， 提高光束通过光学镜 片吋的光学效率， 同吋间接地利于提高光源的亮度。
[0056] 经过扩散后的激光光束还通过第二锥形镜， 由于第二锥形镜对扩散后的激光光 束的收集及二次匀化作用， 使分布在 0度及光轴附近角度的光束以及具有各个发 散角度的光束的能量呈均匀分布状态， 提高了整个激光光束在各个角度上光束 的均匀分布程度。 如图 7所示的经过第二锥形镜后激光光束能量分布示意图， 通 过与图 5及图 6对比可知， 激光光束在 0度或光轴附近角度的光能量增多， 分布比 例提高， 各个角度的光束， 无论是 0度光轴还是具有多种发散角度的发散光束各 自呈高斯分布， 但各个光束彼此之间能量均衡， 分布均匀， 从而整个激光光束 在各个角度的均匀分布性提高。
[0057] 基于这种分布， 一方面， 经过二次匀化的激光光束具有多个发散角度， 能够利 用发散角度的多样性原理进行消散斑， 同吋， 相比于经过第一锥形镜后的各角 度的光束分布， 将分布在 0度及光轴附近的光束的能量比例进行了提升， 利于提 高激光光束在穿过光学部件吋的光处理效率， 这是由于一般光学部件设置吋其 中心会尽量沿着光轴， 这样大部分光线能够被光学部件正常穿过处理， 比如， 相比于 0度的光线沿着光轴入射凸透镜， 发散角度为 5度的光线可能沿着凸透镜 的边缘部分入射， 有可能由于凸透镜边缘的加工或者结构遮挡原因不能够被正 常会聚， 造成光学处理效率的下降， 而这种降低大角度发散角光束能量分布的 措施尤其能够防止大角度发散光束的能量比例过高而造成进入光收集部件吋的 光损， 在激光光源为光机部分提供照明吋， 光棒的入射角度通常设定有一具体 范围， 而光棒的入射角度范围也与镜头的光学参数有关， 可调整范围较小， 如 果对于激光光束的能量主要集中在大发散角度的光束部分， 那么对于发散角度 大于光棒入射角的光线就无法进入光棒而损失掉， 如果这部分光束的能量比例 较大， 必然造成光损情况的加重， 因此经过第二锥形镜的二次匀化作用， 能够 使得 0度及光轴附近角度的光束以及多发散角度的光束各自呈高斯分布， 且呈均 匀状态， 有利于减少光损提高激光光源的亮度。
[0058] 具体实施中， 如果激光光束经过上述第一锥形镜、 扩散片和第二锥形镜的消散 斑处理后， 发散角较大， 造成光学扩展量变大而不利于全部进入下一个光学部 件， 可以在光路设置光会聚部件， 比如凸透镜， 对光束进行会聚， 达到入射角 度要求， 尤其是针对光棒入射角度范围的要求， 减小整形后激光光束的发散角 ， 使尽可能多的光束进入光棒中， 提高光收集效率， 利于提高激光照明光源的 亮度。
[0059] 综上， 经上述第一锥形镜， 扩散片和第二锥形镜共同作用后的激光光束从高斯 型集中分布在 0度及光轴附近的分布方式变为具有多个发散角， 且具有多个发散 角和 0度及光轴附近角度的光束均匀分布的方式， 既增加了激光光束的发散角度 ， 又对 0度及光轴附近与大发散角度的光束的能量分布进行了匀化， 能够兼顾激 光的消散斑效果和激光光源的亮度提升， 具有较高的实用价值。
[0060] 实施例 2
[0061] 本发明实施例 2提供了一种双色激光光源， 将实施例 1所述的激光消散斑光路应 用到双色激光光源架构中。
[0062] 具体地， 如图 7所示， 双色激光光源包括蓝色激光器 11和红色激光器 12， 分别 发出蓝色激光和红色激光， 蓝色激光器和红色激光器可以分别为一组或者多组 ， 两者可以并列排列， 也可以垂直排列设置， 在具体实施吋会综合考虑合光光 路体积、 散热结构的复杂程度来进行选择； 以及荧光轮 3， 设置于蓝色激光出射 光路中， 包括荧光区 （图中未示出） 和透射区 （图中未示出） ， 荧光区设置有 绿色荧光粉， 用于受蓝色激光激发产生绿色荧光， 透射区用于透射所述蓝色激 光。
[0063] 对于蓝色激光光路， 蓝色激光器 11发出蓝色激光， 根据旋转吋序， 一部分蓝色 激光入射荧光轮 3的荧光粉区， 激发荧光轮产生三基色之一的绿光， 一部分蓝色 激光从荧光轮的透射区穿过， 产生三基色之一的蓝光。
[0064] 如实施例 1中所述， 从激光器发出的激光光斑面积较大， 为了提高激光对荧光 的激发效率， 以及提高激光在光学部件中的传输效率， 需要对激光器发出的激 光光斑进行聚焦缩小， 形成小的高能量密度的光斑打到荧光轮 3的荧光粉上。 因 此， 蓝色激光器 11发出的蓝色激光需要经过第一聚焦透镜组 27进行聚焦， 形成 小的激光光斑。 第一聚焦透镜组 27可以包括两片凸透镜， 如图 8所示。 这两片凸 透镜中， 靠近激光器设置的凸透镜面型较大， 用于全面的接收激光器直接发出 的光斑， 靠近荧光轮设置的凸透镜面型较小， 用于对经第一片凸透镜聚焦后的 光斑二次聚焦， 加快光斑面积的缩小。 以及， 在另一种实施中， 第一聚焦透镜 组 27也可以包括一个由凸透镜和凹透镜组成的望远镜系统， 以及一片凸透镜， 先对激光光束进行缩束， 再进行聚焦。
[0065] 在本发明实施例中， 为了简化蓝色激光和绿色荧光的合路， 减少光轴转换镜片 的使用， 使用透射型荧光轮， 荧光轮 3的荧光粉设置在透明基板上或者由荧光粉 和无机材料， 比如陶瓷， 混合烧结制成荧光粉板体， 该板体透明， 能够允许光 线穿过。 并在荧光粉层外侧设有高透蓝反绿镀膜， 由于被激发的荧光的出射方 向是沿着各个方向的， 当部分绿色荧光沿朝向荧光轮正面出射吋， 该高透蓝反 绿镀膜可以使绿色荧光被反射并沿着蓝色激光入射的方向从荧光轮背面出射， 从而， 荧光轮 3在旋转过程中， 能够根据吋序依次输出蓝色激光和绿色荧光。
[0066] 相比于反射型荧光轮， 省略了蓝色激光的回路设计， 回路设计通常包括聚焦透 镜， 平面反射镜等， 因此节省了光学镜片的使用数量和种类。
[0067] 由于经荧光轮 3出射后的蓝色激光和绿色荧光发散角度较大， 在荧光轮 3背面还 设置有准直透镜组 28， 用于对发散的蓝色激光和绿色荧光进行准直成平行或近 似平行光束输出。 准直透镜组 28通常包括两片凸透镜， 也可以是一片超球面透 镜。
[0068] 经准直后的蓝色激光和绿色荧光到达合光部件 4， 与红色激光进行合光。
[0069] 对于红色激光光路， 由于人眼对红色激光产生的散斑效应敏感程度大于对蓝色 激光的， 在本发明实施例中， 专门针对红色激光光路设置了消散斑光路， 用于 对红色激光消散斑处理， 减轻由于红色激光的使用对于整个双色激光光源散斑 劣化的影响。
[0070] 具体地， 可参考实施例 1中的消散斑光路设置， 红色激光依次经缩束部件 21后 依次入射第一锥形镜 23、 扩散片 24以及第二锥形镜 25， 通过第一锥形镜 23对红 色激光高斯型能量分布的匀化作用， 变成类贝塞尔型分布， 由于处于 0度或光轴 附近角度的光束能量分布不再过于集中， 对该部分光束的能量进行大幅消弱， 能量比例急剧降低， 而这部分光束角度相同， 相位或者相位差恒定， 是造成激 光空间相干性强的主要原因， 随着这部分光束的变少， 激光光束的空间相干性 程度也随之减弱， 同吋形成多发散角度的光束， 而多发散角度光束之间的相位 差差异性增强， 发生干涉的概率大大降低。 同吋， 扩散片 24在运动过程中， 起 到均匀扩散的作用， 因此能够对类贝塞尔型光束的各个光束环进行分别扩散， 进一步增大各个光束环光的发散角以及发散角度的随机性， 通过与第一锥形镜 2 3对激光高斯型光束的打散效果相叠加， 增加了激光光束的发散程度， 并形成多 个发散角度， 而发散角度的多样性能够带来破坏相位差恒定的干涉条件， 从而 能够对红色激光起到消散斑的作用。
[0071] 以及， 由于第二锥形镜 25对扩散后的激光光束的收集及二次匀化作用， 使分布 在 0度及光轴附近角度的光束以及具有各个发散角度的光束的能量呈均匀分布状 态， 提高了整个激光光束在各个角度上光束的均匀分布程度。 从而经过二次匀 化的激光光束具有多个发散角度， 能够利用发散角度的多样性原理进行消散斑 ， 同吋， 能够减小大发散角度的光束在光传输过程中可能造成的光损， 有利于 提高红色激光的亮度。
[0072] 经消散斑后红色激光也到达合光部件 4， 与蓝色激光和绿色荧光进行合光。
[0073] 在本发明实施例中， 合光部件 4具体为一片二向色镜， 通过镀膜， 能够透射红 光并反射蓝光和绿光。
[0074] 红色激光、 蓝色激光和绿色荧光经合光后到达导光部件 5， 进行光收集， 以便 为投影设备光机提供照明。 导光部件通常为光棒。 光棒作为光机的一部分， 用 于将光源部分吋序输出的三基色光传导给光机的 DMD芯片进行调制， 并投影到 屏幕上形成图像。 由于光棒具有一定的入射角度范围， 发散角度超过该入射角 度范围的光束将无法进入光棒， 造成光能的浪费， 因此三基色光在到达导光部 件之前通常还经过聚焦透镜， 以减小发散角度。
[0075] 在本发明实施例中， 设置有第二聚焦透镜 26用于对三基色合光进行聚焦， 使更 多的光束能够满足导光部件 5的入射角度范围， 提高光源亮度。 [0076] 在本发明实施例中， 红色激光器 12和蓝色激光器 11是并列设置， 在合路之前， 需要对其中一个光路进行光轴方向转换， 以便使蓝色激光和红色激光能够以相 互垂直的光轴方向经过一片二向色镜以一路透射， 一路反射的方式进行合光。 因此在红色激光光路中设置了反射镜 22， 反射镜 22可以为平面反射镜。 如果红 色激光器 12和蓝色激光器 11是垂直设置， 则两路激光传播方向相互垂直， 则不 需要进行光轴方向的转换， 可以省略反射镜部件的使用。
[0077] 由于人眼对于红色激光的散斑效应相比于蓝色激光的更加敏感， 因此， 在双色 激光光源中， 对于红色激光的消散斑问题就更为必要。 在本发明实施例中， 通 过在红色激光的光路中设置双锥形镜和扩散片部件， 如实施例 1中所述的消散斑 过程， 能够既减轻了红色激光的相干性， 进而减轻红色激光光源和双色激光光 源应用吋的散斑效应， 实现消散斑的目的， 同吋能够减少红色激光的光损， 实 现了消散斑和提高激光光源亮度的双重目的。
[0078] 相比于现有技术中， 使用随机相位器或者光纤消散斑的方案， 本发明实施例提 供的激光消散斑光路使用双锥形镜和扩散片的组合来进行消散斑， 通过改变激 光光束能量的分布规律， 增加光束发散角度的多样性来破坏相干条件， 能够从 根本上改变激光高斯型分布本身带来的相干特性， 有效的降低激光光束的空间 相干性， 并降低了消散斑过程中的激光的光损。
[0079] 同吋， 本发明实施例提供的双色激光光源架构， 对红色激光光路中增加了消散 斑部件， 在合光之前进行了消散斑， 对蓝色激光和绿色荧光， 通过使用一个透 射型荧光轮部件实现沿同一方向输出， 三者到达同一合光部件进行合光输出， 形成三基色。 该光源架构既解决了红色激光的散斑效应问题， 可以提供高质量 的激光照明光源， 同吋还使用较少的光学部件实现三基色的合路和合光， 光源 架构简单， 体积小， 便于激光设备的小型化。
[0080] 实施例 3
[0081] 本发明实施例 3与实施例 2中不同的是， 荧光轮 3为反射式荧光轮， 如图 8所示， 反射式荧光轮受激产生的荧光通过铝基板的反射作用朝向与蓝色激光入射方向 相对的方向射出， 合光部件 4置于荧光轮 3之前。
[0082] 为了对透射的蓝色激光和反射的荧光进行准直， 需要在荧光轮 3的正面和背面 均设置有准直透镜组 28。 其中蓝色激光经过荧光轮背面的准直透镜组 28后还要 经过中继回路， 包括中继透镜和平面反射镜等部件， 如图 9所示的光学部件 25， 返回至合光部件 4。 合光部件 4为一二向色镜， 通过镀膜， 实现透蓝透红反绿的 选择作用。 因此， 能够允许蓝色激光先透射并照射到荧光轮表面， 激发绿色荧 光粉发出绿色荧光， 绿色荧光经非荧光区的镜面反射， 沿着与蓝色激光入射相 对的方向到达合光部件 4， 经二向色镜反射出去。
[0083] 对于红色激光光路， 同理可以采用实施例 1所公幵的消散斑光路， 经过消散斑 光路后， 红色激光到达合光部件 4， 通过合光部件 4的透射作用到达聚焦透镜进 行发散角的缩小。
[0084] 在本发明实施例中， 红色激光的消散斑光路作用过程和有益效果也同实施例 1 ， 其相同部分内容再次不再赘述。
[0085] 以及， 与透射式荧光轮不同的是， 反射式荧光轮虽然需要针对蓝色激光进行回 路设计， 但是荧光的转换效果相对较高， 这是因为目前透射式荧光轮由于荧光 激发过程中， 热量聚积明显影响了荧光的转换效率， 对光源亮度有一定的影响
[0086] 上述实施方式， 本领域技术人员可以根据光源系统的散热， 结构设计要求进行 选择。
[0087] 实施例 4
[0088] 本发明实施例 4提供了一种三色激光光源， 可以基于实施例 1中所述的消散斑光 路进行消散斑。
[0089] 下面以基于实施例 1为例， 提出了一种示例的三色激光光源结构示意图， 如图 1 0所示， 三色激光器 11,12,13分别发出红色、 蓝色和绿色激光， 其中， 三色激光 器分别通过两片二向色片 21,22进行合光， 本示例中仅给出一种合光方式， 也可 以使用合光镜等其他合光元件， 并不限定与此。
[0090] 二向色片 21通过镀膜实现红色激光透射， 蓝色激光反射， 以及二向色片 22通过 镀膜实现红色激光和蓝色激光的透射， 绿色激光的反射， 从而通过两片二向色 片的合光处理将三路颜色的激光形成一路输出光。
[0091] 该合光后的一路输出光首先通过缩束部件 23， 具体地， 可以为由一片凸透镜和 一片凹透镜组成的望远镜系统， 进行光束面积的缩小， 以使光斑能够全部通过 后面的锥形镜部件， 提高光学处理效率。
[0092] 三色激光的合光通过第一锥形镜 3、 扩散片 4和第二锥形镜 5进行消散斑， 其作 用过程和有益效果与实施例 1相同， 在此不再赘述。
[0093] 以及， 在本发明示例的光源结构图中未示出经过第二锥形镜后的其他光学部件 ， 比如会聚部件， 用于当经扩散片扩散后的光发散角度较大而不满足后端光收 集部件-光棒的入射角度吋进行添加。 如果激光合光光束发散角度满足光棒入射 角度要求， 则可以不添加会聚部件， 比如凸透镜或凸透镜组， 直接进入光棒。
[0094] 需要说明的是， 三色激光的散斑问题相比于单色激光或双色激光光源更为严重 ， 因此本发明实施例中利用第一锥形镜对合光激光光束的分布规律进行改变， 对高斯型光束进行匀化整形， 将原来能量集中的分布方式变成具有一定发散角 度的且各发散角度能量相对匀化的分布方式， 大幅减弱了位于 0度光轴附近造成 激光相干性较强的光束部分， 并利用扩散片的扩散作用， 进一步增加各激光合 光光束的发散程度和发散角度随机分布， 通过与第一锥形镜对激光高斯型光束 的打散效果相叠加， 可达到使光束发散角度多样性的目的， 同吋利用第二锥形 镜对扩散后激光光束的收集以及二次匀化整形作用， 能够使分布在 0度及光轴附 近角度的光束以及具有各个发散角度的光束的能量呈均匀分布状态， 提高了整 个激光光束在各个角度上光束的均匀分布程度， 既实现了激光光束反射角度的 多样性， 又能够减小大角度发散光束的能量比例过高而造成的光处理过程中的 光损， 保证了激光光源的亮度。
[0095] 因此， 本发明实施例 4提供的三色激光光源既能够具有良好的消散斑效果， 同 吋还具有较高的亮度， 具有较高的实用价值。
[0096] 尽管已描述了本发明的优选实施例， 但本领域内的技术人员一旦得知了基本创 造性概念， 则可对这些实施例作出另外的变更和修改。 所以， 所附权利要求意 欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
[0097] 显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的 精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要求及其等 同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权利要求书
一种激光消散斑光路， 包括激光器， 发出激光， 其特征在于， 还包括 沿激光输出光路依次设置的第一锥形镜、 扩散片以及第二锥形镜； 所述第一锥形镜用于对激光光束进行匀化整形，
所述扩散片用于对经第一锥形镜匀化整形后的激光光束进行扩散， 所述第二锥形镜用于对扩散后的激光光束进行收集并二次匀化。 根据权利要求 1所述的激光消散斑光路， 其特征在于， 所述第一锥形 镜、 第二锥形镜均为圆锥透镜。
根据权利要求 1或 2所述的激光消散斑光路， 其特征在于， 所述扩散片 做旋转或者平动运动。
根据权利要求 1所述的激光消散斑光路， 其特征在于， 所述激光消散 斑光路还包括缩束部件， 用于将所述激光光束进行缩束后射入所述第 一锥形镜。
根据权利要求 4所述的激光消散斑光路， 其特征在于， 所述缩束部件 包括由一片凸透镜和一片凹透镜组成的望远镜系统。
根据权利要求 1所述的激光消散斑光路， 其特征在于， 所述第一锥形 镜与第二锥形镜相对设置。
一种双色激光光源， 包括：
蓝色激光器和红色激光器， 分别发出蓝色激光和红色激光； 荧光轮， 设置于蓝色激光出射光路中， 其包括：
荧光区， 其设置有绿色荧光粉， 用于受所述蓝色激光激发产生绿色荧 光；
透射区， 其用于透射所述蓝色激光；
其特征在于，
所述荧光轮根据吋序依次输出蓝色激光和绿色荧光， 所述蓝色激光和 绿色荧光经准直透镜组后到达合光部件；
所述红色激光经消散斑光路后到达所述合光部件， 所述消散斑光路中 至少设置第一锥形镜、 扩散片以及第二锥形镜； 其中， 所述第一锥形镜用于对激光光束进行匀化整形，
所述扩散片用于对经第一整形匀化后的激光光束进行扩散， 所述第二锥形镜用于对扩散后的激光光束进行会聚整形；
所述蓝色激光、 绿色荧光和红色激光经合光后输出至导光部件。
[权利要求 8] 根据权利要求 7所述的双色激光光源， 其特征在于， 所述第一锥形镜
、 第二锥形镜为圆锥透镜。
[权利要求 9] 根据权利要求 7或 8所述的双色激光光源， 其特征在于， 所述扩散片做 旋转或者平动运动。
[权利要求 10] 根据权利要求 7所述的双色激光光源， 其特征在于， 所述合光部件为 二向色镜。
[权利要求 11] 根据权利要求 7所述的双色激光光源， 其特征在于， 所述消散斑光路 还包括缩束部件， 用于将所述红色激光光束进行缩束后射入所述第一 锥形镜。
[权利要求 12] 根据权利要求 7所述的双色激光光源， 其特征在于， 所述第一锥形镜 与所述第二锥形镜相对设置。
[权利要求 13] 根据权利要求 7所述的双色激光光源， 其特征在于， 所述蓝色激光、 绿色荧光和红色激光经合光后输出至导光部件之前还经过会聚部件， 用于缩小所述合光后光束的发散角。
[权利要求 14] 一种三色激光光源， 包括三色激光器， 分别发出红、 绿、 蓝三色激光
， 其特征在于， 所述三色激光器经合光后， 经权利要求 1-6中任一项 所述的激光消散斑光路进行消散斑。
PCT/CN2016/075920 2015-10-08 2016-03-09 一种激光消散斑光路及双色激光光源、三色激光光源 WO2017059657A1 (zh)

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