WO2018134064A1 - Agencement optique de concentration de faisceau - Google Patents

Agencement optique de concentration de faisceau Download PDF

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Publication number
WO2018134064A1
WO2018134064A1 PCT/EP2018/050307 EP2018050307W WO2018134064A1 WO 2018134064 A1 WO2018134064 A1 WO 2018134064A1 EP 2018050307 W EP2018050307 W EP 2018050307W WO 2018134064 A1 WO2018134064 A1 WO 2018134064A1
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WO
WIPO (PCT)
Prior art keywords
optical
light
optics
emitters
merging
Prior art date
Application number
PCT/EP2018/050307
Other languages
German (de)
English (en)
Inventor
Reinhold Fiess
Stefanie Mayer
Annette Frederiksen
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018134064A1 publication Critical patent/WO2018134064A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1086—Beam splitting or combining systems operating by diffraction only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
    • G02B5/188—Plurality of such optical elements formed in or on a supporting substrate
    • G02B5/1885—Arranged as a periodic array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/804—Optical devices
    • F05B2270/8042—Lidar systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G01S7/4815—Constructional features, e.g. arrangements of optical elements of transmitters alone using multiple transmitters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms

Definitions

  • the present invention relates to an optical arrangement for
  • a scanning device which comprises a plurality of semiconductor lasers which emit a plurality of laser beams.
  • the laser beams are converted by a Kolimationslinse into parallel beams.
  • the device in this variant further comprises an optical system for merging the laser beams, which focuses the parallel laser beams on a common point.
  • the plurality of semiconductor lasers is positioned so that the emitted laser beams are focused on a common point.
  • the device in this variant further comprises a plurality of optical systems for combining the laser beams, which are positioned to the respectively corresponding semiconductor laser, that the
  • Laser beams can be focused in the common point.
  • the device further comprises a deflection optics, by means of which the laser beams are deflected and scanned.
  • the LED lamp in particular LED headlights, with an active light source of a plurality of identically or differently colored LEDs, which are arranged on a flat or curved surface or board are known.
  • the LED light also includes an optical system.
  • the optical system has a collimating optics, the individual lenses are arranged at a small distance above the emitting surfaces of the LEDs and collects the light emitted by the LEDs light, bundles and directs to a surface.
  • the optical system further comprises a mixing optics which picks up the light directed and focused into a surface and mixes them with respect to color and / or brightness.
  • the optical system furthermore has field optics which receive the light emitted by the mixing optics and radiate them into the far field with a predetermined light distribution.
  • the present invention is based on an optical arrangement for
  • the optical arrangement has at least one optical path with at least two emitters for emitting light, at least one collimating optics and at least one
  • the collimation optics is designed as a holographic optical element.
  • the beam-combining optical system is also designed as a holographic optical element.
  • light is represented according to the beam optics as a light beam.
  • the terms light and light beam are used synonymously.
  • An emitter may have a narrow spectral bandwidth.
  • the at least two emitters may be formed as emitter matrix or as an arrangement of a plurality of individual emitters.
  • An emitter can be understood as a laser emitter.
  • a laser emitter can emit laser light.
  • the at least two laser emitters can be designed as a laser matrix or as an arrangement of a plurality of individual laser diodes.
  • An emitter can also be understood to mean a light-emitting diode.
  • a light-emitting diode may preferably be spectrally narrow-band.
  • a Spectral narrow-band light-emitting diode may for example be a superluminescent diode.
  • a holographic optical element can be understood as an optical element which has been produced by means of holographic methods.
  • a holographic method may be, for example, holographic printing.
  • a holographic printer can be used.
  • the holographic optical elements of the optical arrangement can be inexpensively multiplied, for example by means of optical replication methods (for example contact copies).
  • holographic optical elements in the invention are superimposed.
  • the resulting interference pattern can be recorded in a photosensitive layer as a grid structure.
  • Light incident on a holographic optical element may be deflected by the recorded grating structure.
  • Glass lenses, prisms, beam splitter mirrors or microlenses have a smaller thickness.
  • the optical arrangement for beam merging can be very compact.
  • the optical arrangement for beam merging may be smaller than when using conventional optical elements.
  • Beam quality is necessary.
  • the high power can be realized in the optical arrangement by combining the light from the at least two emitters.
  • high beam quality for example, a small divergence of the converged light beam can be understood.
  • the collimating optics designed as a holographic optical element and the beam combining optics formed as a holographic optical element can allow a higher beam quality of the merged light beam than conventional optical elements.
  • Holographic optical elements can be adapted in their manufacture very precisely to the overall appearance of an optical system.
  • the holographic optical elements of the beam combining optical arrangement can be adapted so that an optical system having the beam combining optical arrangement can be very efficient. Compared to optical systems with conventional optical elements, when using the optical arrangement for
  • the optical arrangement for beam convergence can be particularly advantageous for scanning systems in which a light beam, in particular a
  • the deflection unit may be
  • Arrangement for beam merging of the merged laser beam with substantially less losses are directed through a micromirror.
  • the aperture of the deflection unit may be small.
  • a corresponding micromirror may be small (for example, ⁇ 3 mm).
  • the collimating optics is formed as an arrangement of at least two spatially separated, holographic optical structures.
  • each of the at least two holographic optical structures is assigned in each case to an emitter.
  • Each of the at least two holographic optical structures is configured to collimate light from the associated emitter along a respective deflection direction.
  • Each of the at least two holographic optical structures is designed to deflect light from the associated emitter in such a way by a predetermined deflection angle that it is collimated along each deflection direction.
  • Each of the at least two holographic optical structures may in particular be designed to collimate light from the associated emitter along a respective deflection direction in such a way that it impinges on the beam merging optical system at a respectively predetermined angle of incidence.
  • the at least two holographic optical structures may in particular be designed such that the difference between the angles of incidence of the light from the at least two emitters on the beam merging optical system exceeds a predetermined value.
  • the difference of the angles of incidence may for example be greater than 5 °.
  • the advantage of this embodiment is that the light from each of the at least two emitters can be deflected in such a way that it strikes the beam merging optics largely loss-free.
  • beam merging optics may have several different ones
  • the optical cross-coupling of different holograms of the beam-combining optical system can be kept low.
  • the collimating optics is designed as a volume hologram.
  • the lattice structure, which causes the collimation function, is recorded in the volume of the photosensitive layer during manufacture.
  • Volume holograms can be cheaper in their production than
  • optical elements be conventional optical elements.
  • various optical functions such as reflection, transmission or
  • the beam-combining optical system is designed to emit the light from the
  • Deflection directions of the at least two holographic optical structures merge into a common emission direction.
  • Beam merging optics combine the light into a merged light beam.
  • the beam combining optics redirects the light to a converged light beam.
  • the deflection of the light from the deflecting directions of the at least two holographic optical structures of the collimating optics to form a combined light beam takes place here by means of the beam merging optics in an angle-dependent manner.
  • Each of the light beams collimated along one deflection direction can strike the beam combining optical system at a predetermined angle of incidence.
  • each of the light beams collimated along one deflection direction can be deflected by a respective predetermined deflection angle such that the merged light can propagate along a common optical axis. For this, the
  • Beam merging optics for example, several different
  • Holograms each having different angle dependence.
  • a corresponding angle dependence may e.g. be adjusted by the thickness of the holographic material.
  • the advantage of this embodiment is that a subsequent beam shaping in the far field is possible due to the high beam quality of the merged light beam.
  • the merged light beam can be focused, for example, in the far field.
  • the resolution in the far field can be increased.
  • the at least two emitters, the collimating optics and the beam merging optics are arranged relative to one another such that the difference in the angle of incidence of the light from the at least two emitters on the beam merging optics exceeds a predetermined value.
  • the difference of the angles of incidence of the light from the at least two emitters on the beam merger optics is sufficiently high. Sufficiently high can mean that unwanted interactions of the light from the different deflection directions when passing through the beam-combining optical system are largely avoided can be.
  • the optical cross-coupling of different holograms of the beam combining optics can be kept low.
  • the beam merging optics is designed as a volume hologram.
  • the lattice structure causing the beam-combining optics is recorded in the volume of the photosensitive layer during manufacture.
  • the beam-combining optical system is designed as a multiplex hologram.
  • the advantage of this embodiment is that several optical functions can be present in direct proximity to each other. Several layers can be arranged directly above one another, which have mutually different grating structures recorded by means of holographic methods.
  • the at least two emitters are electrically controllable independently of one another.
  • the advantage of this embodiment is that the optical
  • Arrangement can find use in optical systems where the eye safety of relevance. These can be optical systems used, for example, in road traffic. Due to the possibility of electrically controlling the at least two emitters independently of one another, the eye safety of the optical arrangement, and thus, for example, of the optical system, can be adjusted as required.
  • the eye safety of the optical arrangement and thus, for example, of the optical system, can be adjusted as required.
  • only all of the at least two emitters can be electrically actuated at a specific minimum speed of the motor vehicle. It is possible to connect all of the at least two emitters only at a certain minimum speed.
  • the optical arrangement has a first optical path with at least two emitters for emitting light, at least one first collimating optics and at least one first beam merger optics for merging the light along a radiation direction of the first optical path.
  • the optical arrangement has at least one second optical path with at least two second emitters for emitting light, at least one second collimating optics and at least one second
  • Beam merging optics for merging the light along a radiation direction of the at least second optical path.
  • the optical arrangement further comprises at least third beam combining optics for merging the light from the emission direction of the first optical path and from the emission direction of the at least second optical path.
  • the advantage of this embodiment is that a converged light beam can be realized with even higher power. Also in this embodiment of the invention, the merged light beam has a high beam quality.
  • the optical arrangement for beam convergence can also be very compact in this embodiment.
  • the optical arrangement for beam convergence can also be very compact in this embodiment.
  • Beam merging may be smaller than when using conventional optical elements.
  • the wavelength of the light emitted by the at least two first emitters of the wavelength of the at least two second emitters is provided that the wavelength of the light emitted by the at least two first emitters of the wavelength of the at least two second emitters
  • the advantage of this embodiment is that the merged light beam can have different wavelengths.
  • Laser headlight or in an LED headlight is used.
  • Receivers are positioned on a common optical axis) as well as biaxial (transmitter and receiver are not positioned on a common optical axis) systems can be realized. Because the optical arrangement for beam convergence can be very compact and the merged light beam can have a high power and high beam quality, are also biaxial lidar systems with small
  • Figure 1 shows a first embodiment of an optical arrangement for
  • Figure 2 is a plan view of an emitter matrix and a collimating optics
  • Figure 3 shows a second embodiment of an optical arrangement for
  • Figure 4 shows a third embodiment of an optical arrangement for
  • Figure 1 shows an example of a first embodiment of the invention. Shown is the optical arrangement 100, which has the optical path 103.
  • the optical path 103 has the emitters 101.
  • the emitters can be, for example, laser emitters or spectrally narrow-band light-emitting diodes.
  • the emitters 101-a to 101-e are part of one
  • Each of the emitters 101 may emit light 102 each. This is exemplified for the emitters 101-a, 101-c and 101-d. Emitter 101-a emits light 102-a. Emitter 101-c emits light 102-c. The emitter 101-d emits light 102-d. By means of a control device, not shown here, it may be possible for the emitters 101-a to 101-e to be independent of one another
  • the light 102-a to 102-e emitted by the emitters 101-a to 101-e strikes the collimating optics 104 of the optical path 103.
  • the collimating optic 104 is formed as a holographic optical element. Here is the
  • Collimation optics 104 in particular as an arrangement of the spatially separated, holographic optical structures 105-a to 105-e formed.
  • Each of the holographic optical structures 105-a to 105-e is assigned to an emitter 101-a to 101-e, respectively. This assignment is shown in more detail in FIG. 2 described below.
  • Each of the holographic optical structures 105-a to 105-e may be the light
  • holographic optical structures 105-a, 105-c and 105-d directs the light 102-a out of the
  • Light 102-a is collimated along the deflection direction 106-a as it passes through the holographic optical structure 105-a.
  • the light beam 109-a can strike the beam merging optical system 107 of the optical path 103 at a predetermined angle of incidence.
  • the emitter 101-c and the holographic optical structure 105-c are in the optical axis of the example
  • the holographic optical structures 105-c need not deflect the light 102-c as much as possible.
  • the light 102-c is collimated along the deflection direction 106-c as it passes through the holographic optical structure 105-c.
  • the light beam 109-c can be incident on the beam-combining optical system at a predetermined angle of incidence
  • the holographic optical structure 105-d deflects the light 102-d from the associated emitter 101-d by a predetermined deflection angle.
  • the light 102-d is collimated along the deflection direction 106-d as it passes through the holographic optical structure 105-d.
  • the light beam 109-d at a predetermined angle of incidence on the
  • Beam collimating optics 107 meet.
  • Structures 105-a to 105-e may in this case be designed in particular such that the deflection directions 106-a to 106-e are so different from one another
  • the holographic optical structures 105-a to 105-e can in this case be designed in particular such that the difference between the angles of incidence of the light beams 109-a to 109-e on the beam-combining optical system 107 is a predetermined one
  • the difference of the angles of incidence may for example be greater than 5 °.
  • the beam-combining optic 107 of the optical path 103 merges the light (s) 109-a to 109-e from the deflection directions 106-a to 106-e.
  • This can be realized, for example, in that the beam merging optics 107 has a plurality of different holograms, each having a different angular dependence.
  • corresponding angle dependence may e.g. be adjusted by the thickness of the holographic material of the holograms (see Figure 5).
  • each of the light beams 109-a to 109-e can be deflected by means of the beam-combining optical system 107 by a deflection angle that differs from each other depending on the respective angle of incidence.
  • the light from the deflection direction 106-a to 106-e can thereby be brought together along a common optical axis 108 as a light beam 110.
  • the light beam 110 may be emitted along the emission direction 108 of the optical path 103 from the optical arrangement 100.
  • the collimation optics 104 may be formed as a volume hologram.
  • the beam merging optics 107 may be formed as a volume hologram. Volume holograms can enable very high deflection angles and very short focal lengths. As a result, the optical arrangement 100 for beam convergence can be very compact.
  • FIG. 2 shows, by way of example, a top view of emitter 101 and one
  • Collimation optics 104 This may, for example, each be a section of an emitter matrix and a collimation optics 104.
  • the smaller circles represent the emitters 101. These can each have, for example, a diameter of 150 ⁇ m.
  • the larger circles drawn around the smaller circles represent the holographic optical structures 105.
  • the distance between two emitters 101 is marked by the bracket 201.
  • the distance 201 may be, for example, about 500 ⁇ .
  • the length or width of the collimating optics 104 is marked by the bracket 202.
  • the length 202 or the width 202 of the collimation optics 104 may be 1.5 mm, for example.
  • the diameter of the collimating optics 104 is marked by the bracket 203.
  • the differences in the angles of incidence of the collimated light beams on the beam merging optics 107 can be sufficiently high.
  • the emitters 101 are detected behind the holographic optical structures 105.
  • the holographic optical structure 105-a is assigned to the emitter 101-a.
  • the holographic optical structure 105-b is assigned to the emitter 101-b.
  • the holographic optical structure 105-c is assigned to the emitter 101-c.
  • Figure 3 shows an example of a second embodiment of the invention. Shown is the optical arrangement 300 for beam combining, which has two optical paths.
  • the first optical path 303-1 has the optical emitters 101-la to 101-le for emitting the light 102-la to 102-le, the first collimating optical system 104-1 and the first beam merging optical system 107-1 for converging the light along the first one Radiation direction 108-1 of the first optical path 303-1.
  • the second optical path 303-2 has the optical emitters 101-2a to 101-2e for emitting the light 102-2a to 102-2e, the second collimating optical 104-2 and the second one
  • Beam merging optics 107-2 for merging the light along the radiation direction 108-2 of the second optical path 303-2.
  • Wavelength ⁇ -1 of the light 102-la to 102-le emitted from the emitters 101-la to 101-le may be from the wavelength ⁇ -2 of the light 102-2a to 102 emitted from the emitters 101-2a to 101-2e -2e different.
  • the Wavelengths ⁇ -l and ⁇ -2 may also be at least nearly identical to each other in a further embodiment.
  • Components of the second optical path 303-2 respectively correspond to the features and functions of the respective comparable optical
  • the light beam 110-1 is radiated along the emission direction 108-1 of the first optical path 303-1 through the operation of the first beam merging optical system 107-1 of the first optical path 303-1.
  • the beam merging optical system 107-2 of the second optical path 303-2 the light beam 110-2 is radiated along the radiation direction 108-2 of the second optical path 303-2.
  • the optical arrangement 300 has a third beam merging optical system 301.
  • the beam merging optics 301 may be formed as a holographic optical element.
  • the features and operation of the third beam merging optics 301 are comparable to those of FIG.
  • the third beam merging optics 301 carries the light (s)
  • Beam merging optics 107-1 or the beam merging optics 107-2 this can be realized, for example, that the Beam merging optical system 301 has a plurality of different holograms each having different angle dependencies. Dependent on the angle of incidence, the light beams 110-1 and 110-2 can, depending on their respective angles of incidence, be applied to the beam-combining optical system 301 by means of the beam-combining optical system 301, each being different from one another
  • Deflection angle are deflected.
  • the light from the emission direction 108-1 of the first optical path 303-1 and out of the emission direction 108-2 of the second optical path 303-2 can thereby be brought together as a light ray 111 along a common optical axis 302.
  • the light beam 111 can be emitted along the emission direction 302 of the optical arrangement 300.
  • Paths 303-2 may be formed such that the deflection direction 108-1 of the first optical path 303-1 and the deflection direction 108-2 of the second optical path 303-2 are different from each other such that the light beams 110-1 are out of the first optical path 303 -1 and the light beams 110-2 from the second optical path 303-2 with mutually different angles of incidence on the beam merger optics 301 hit.
  • beam merging optics 107-1 of the first optical path 303-1 and the holograms of the beam merging optics 107-2 of the second optical path 303-2 may be configured such that the difference in the incident angles of the light beams 110-1 and 110-2 is a predetermined value exceeds.
  • the difference of the angles of incidence may for example be greater than 5 °.
  • the first collimation optics 104-1 may be formed as a volume hologram.
  • the second collimation optics 104-2 may be formed as a volume hologram.
  • the first beam merging optics 107-1 may be referred to as
  • Volume hologram be formed.
  • the second beam merging optics 107-2 may be formed as a volume hologram.
  • the third beam merging optics 107-2 may be formed as a volume hologram.
  • Beam merging optics 301 may be formed as a volume hologram. Volume holograms can be very high deflection angles and very short Allow focal lengths. As a result, the optical arrangement 300 for beam convergence can be very compact.
  • Figure 4 shows an example of a third embodiment of the invention. Shown is the optical arrangement 400 for beam combining, which has three optical paths.
  • the first optical path 303-1 has the optical emitters 101-la to 101-le for emitting the light 102-la to 102-le, the first collimating optical system 104-1 and the first beam merging optical system 107-1 for converging the light along the first one Radiation direction 108-1 of the first optical path 303-1.
  • the second optical path 303-2 has the optical emitters 101-2a to 101-2e for emitting the light 102-2a to 102-2e, the second collimating optical 104-2 and the second one
  • the third optical path 303-3 comprises the optical emitters 101-3a to 101-3e
  • the wavelength ⁇ -1 of the light 102-la to 102-le emitted by the emitters 101-la to 101-le of the first optical path 303-1 may differ from the wavelength ⁇ -2 of the emitter 101-2a to 101- 2e of the second optical path 303-2 emitted light 102-2a to 102-2e differ.
  • the wavelength ⁇ -1 of the light 102-la to 102-le emitted by the emitters 101-la to 101-le of the first optical path 303-1 may be from the wavelength ⁇ -3 of the emitters 101-3a to 101 -3e of the third optical path 303-3 emitted light 102-3a to 102-3e differ.
  • the wavelength ⁇ -2 of the light 102-2a to 102-2e emitted by the emitters 101-2a to 101-2e of the second optical path 303-2 may differ from the wavelength ⁇ -3 of the light emitted by the emitters 101-3a to 101-2e. 3e of the third optical path 303-3 emitted light 102-3a to 102-3e differ.
  • the wavelengths ⁇ -l and ⁇ -2 may also be at least nearly identical to each other in a further embodiment.
  • the wavelengths ⁇ -1 and ⁇ -3 can also be at least nearly identical to one another.
  • the wavelengths ⁇ -2 and ⁇ -3 may also be at least nearly identical to each other.
  • the Wavelengths ⁇ -1 and ⁇ -2 and ⁇ -3 may also be at least nearly identical to each other.
  • the optical arrangement 400 also has a third beam merging optical system 301.
  • the only difference from the third beam merging optics 301 of the optical arrangement 300 is that the third beam merging optics 301 of the optical arrangement 400 receive the light (s) 110-1 from the radiation direction 108-1 of the first optical path 303-1 and the light or light beam , the light beams 110-2 from the emission direction 108-2 of the second optical path 303-2 and also the light or the light rays 110-3 from the emission direction 108-3 merges.
  • the third beam-combining optical system 301 of the optical arrangement 400 reference is made to the description of the beam-combining optical system 301 of the optical arrangement 300 in FIG. 3.
  • Path 303-2 and also the holograms of the beam merging optics 107-3 of the further optical path 303-3 be formed such that the deflection direction 108-1 of the first optical path 303-1 and the deflection direction 108-2 of the second optical path 303-3 2 and also the deflection direction 108-3 of the further optical path 303-3 differ from one another such that the
  • beam converging optics 107-3 of the further optical path 303-3 may in particular be designed such that the difference between the angles of incidence of the light beams 110-1 and 110-2 and 110-3 is a predetermined one Value exceeds.
  • the difference of the angles of incidence may for example be greater than 5 °.
  • the first collimation optics 104-1 may be formed as a volume hologram.
  • the second collimation optics 104-2 may be formed as a volume hologram.
  • the further collimation optics 104-2 can be designed as a volume hologram.
  • the first beam merging optics 107-1 may be formed as a volume hologram.
  • the second beam merging optics 107-2 may be formed as a volume hologram.
  • Beam merging optics 107-3 may be formed as a volume hologram.
  • the third beam merging optics 301 may be formed as a volume hologram.
  • Volume holograms can enable very high deflection angles and very short focal lengths. As a result, the optical arrangement 400 for beam merging can be very compact.
  • FIG. 5 shows by way of example the angular dependence of a holographic optical element.
  • the angle dependence results from the production
  • holographic optical elements by holographic methods.
  • an interference pattern or a grating structure is formed in this photosensitive layer, and thus also a so-called
  • the deflection efficiency U is plotted against the deviation from the dashed line reconstruction angle R of a holographic optical element.
  • Light incident on the holographic optical element may be deflected by the lattice structure of the holographic optical element.
  • the light is deflected efficiently, which strikes the holographic optical element at a predetermined angle of incidence range. This in the example by the
  • Reconstruction angle R be in which the deflection efficiency U is sufficiently high.
  • the deflection efficiency U for light which is in the range of +/- 2 ° deviation from the reconstruction angle R on the holographic optical element hits, still high enough to redirect the light efficiently.
  • Light whose angle of incidence is outside the predetermined angle of incidence range can no longer be deflected efficiently by the holographic optical element and instead is transmitted without deflection.

Abstract

La présente invention concerne un agencement optique pour la concentration d'un faisceau. Ledit agencement comprend au moins un chemin optique avec deux émetteurs pour émettre de la lumière, au moins une optique de collimation et au moins une optique de concentration de faisceau. Le cœur de l'invention repose en ce que l'optique de collimation est formée en tant qu'élément optique de type holographique et en ce que l'optique de concentration de faisceau est formée en tant qu'élément optique de type holographique.
PCT/EP2018/050307 2017-01-18 2018-01-08 Agencement optique de concentration de faisceau WO2018134064A1 (fr)

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DE102017200709.5A DE102017200709A1 (de) 2017-01-18 2017-01-18 Optische Anordnung zur Strahlzusammenführung

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DE102018212516B4 (de) * 2018-07-26 2023-02-02 Robert Bosch Gmbh LIDAR-Sensor und Verfahren zur optischen Erfassung eines Sichtfeldes
DE102019207706B4 (de) 2019-05-27 2023-04-20 Audi Ag Fahrzeugscheinwerfer sowie Kraftfahrzeug mit einem Fahrzeugscheinwerfer

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EP0116896A2 (fr) * 1983-02-16 1984-08-29 Hitachi, Ltd. Procédé de fabrication d'une lentille holographique et outillage optique comprenant une telle lentille holographique
EP0159023A2 (fr) 1984-04-17 1985-10-23 Fuji Photo Film Co., Ltd. Dispositif de balayage optique
US5319496A (en) * 1992-11-18 1994-06-07 Photonics Research Incorporated Optical beam delivery system
WO2002023281A1 (fr) * 2000-09-14 2002-03-21 John Donoghue Systeme permettant de combiner plusieurs lasers de faible puissance
JP2002202414A (ja) * 2000-10-26 2002-07-19 Ricoh Co Ltd ビーム変換素子、該ビーム変換素子を用いた照明光学系、露光装置、レーザ加工機及び投射装置
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WO2011020920A1 (fr) 2009-08-20 2011-02-24 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Lampe à led, en particulier phare à led

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