WO2002063399A9 - Appareil et procede de formation d'hologrammes - Google Patents

Appareil et procede de formation d'hologrammes

Info

Publication number
WO2002063399A9
WO2002063399A9 PCT/JP2002/001092 JP0201092W WO02063399A9 WO 2002063399 A9 WO2002063399 A9 WO 2002063399A9 JP 0201092 W JP0201092 W JP 0201092W WO 02063399 A9 WO02063399 A9 WO 02063399A9
Authority
WO
WIPO (PCT)
Prior art keywords
light
light source
photosensitive material
hologram
output
Prior art date
Application number
PCT/JP2002/001092
Other languages
English (en)
Japanese (ja)
Other versions
WO2002063399A1 (fr
Inventor
Tamiki Takemori
Kenji Kon
Original Assignee
Artnow Ltd
Hamamatsu Photonics Kk
Tamiki Takemori
Kenji Kon
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 Artnow Ltd, Hamamatsu Photonics Kk, Tamiki Takemori, Kenji Kon filed Critical Artnow Ltd
Publication of WO2002063399A1 publication Critical patent/WO2002063399A1/fr
Publication of WO2002063399A9 publication Critical patent/WO2002063399A9/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/268—Holographic stereogram
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/268—Holographic stereogram
    • G03H2001/2695—Dedicated printer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/33—Pulsed light beam

Definitions

  • the present invention relates to an apparatus and method for recording an element hologram by interfering object light and reference light in each of a plurality of local regions on a photosensitive material to create a hologram on the photosensitive material.
  • a holographic stereogram which is a type of hologram, captures a subject as a normal photograph from various directions, spatially modulates the laser light with these normal photographs, and uses the modulated laser light as object light to produce a single hologram.
  • An element hologram is recorded in a local area of a hologram photosensitive material, and such an element hologram is recorded for each local area.
  • Such holographic stereograms are one-dimensional and two-dimensional.
  • the Lippmann-type holographic stereogram created by recording the elementary hologram by the object light and the reference light being incident on the light-sensitive material from different sides is similar to the one where the illumination light is incident on the photosensitive material during reproduction.
  • FIG. 11 is an explanatory diagram of a conventional hologram creation technique described in these documents.
  • the laser light output from the laser light source 111 is split into two by the half mirror 112, and one of the split laser light is split into the mirror 113 and the lens system 114.
  • the spatial light modulator 115 are sequentially passed to the spatial light modulator 115, and the laser light modulated by the spatial light modulator 115 is made into the photosensitive material 117 via the lens 116 as object light as object light.
  • the laser beam split into two by the half mirror 1 1 2 The other is used as reference light and is incident on the photosensitive material 117 from behind via the mirror 118.
  • the object hologram and the reference light that have entered the photosensitive material 117 interfere with each other to record an element hologram.
  • the image presented to the spatial light modulator 1 15 is changed, and the photosensitive material 1 17 is moved, and the element holo-lam is sequentially recorded in each of a plurality of local regions on the photosensitive material 1 17.
  • object illumination light is generated from each element hologram on the photosensitive material 117 by irradiating the illumination light in the same direction as the incident direction of the reference light, and a reproduced image is formed on the illumination light incident side.
  • the object light and reference light do not enter the photosensitive material 117 while the image presented to the spatial light modulator 115 is changed and the photosensitive material 117 is moving. You need to do that. Therefore, in the hologram creation technology described in Document 2, a He-Ne laser light source is used as the laser light source 111, and the laser light (object light, reference light) output from the laser light source 111 is used. An ultrasonic deflection element is used as a shutter mechanism for controlling transmission / blocking of light.
  • Gas laser light sources such as He-Ne laser light source and Ar laser light source are excellent in the wavelength of output laser light and the stability of coherence.
  • the gas laser light source has a problem that it is large, and since the on / off of the laser light output cannot be controlled by the drive circuit, a shutter mechanism is required for this control. Required.
  • a mechanical shutter or an ultrasonic deflection element can be used as the shutter mechanism. Since mechanical shirts generate vibration, it is necessary to take measures against this vibration when creating holograms. For example, swing the holding mechanism that holds the photosensitive material. A holding mechanism or mechanism that holds the photosensitive material so that movement is not transmitted:
  • an ultrasonic deflecting element can generate a periodic refractive index distribution in an optical crystal by propagating ultrasonic waves in the optical crystal, and can perform laser diffraction by this periodic refractive index distribution. Therefore, it is possible to control the Z blocking of the transmission of the laser beam at a very high speed. Also, the ultrasonic deflection element is suitable in that it does not generate vibration. However, ultrasonic deflection elements are expensive.
  • an object of the present invention is to provide an apparatus and a method for producing a mouthgram which is small in size, inexpensive, and free from vibration problems. I do.
  • a hologram forming apparatus is an apparatus that forms an hologram on a photosensitive material by recording an elementary hologram by interfering object light and reference light in each of a plurality of local regions on the photosensitive material.
  • a light source that repeatedly outputs pulsed coherent light by pulse current driving;
  • a light branching unit that splits the coherent light output from the light source into two;
  • One of the branched coherent lights is spatially modulated, and the modulated coherent light is incident on a local region on the photosensitive material as object light.
  • a reference light optical system that causes the other coherent light beam to enter a local area as reference light, and (5) the object light optical system, the reference light optical system, and the photosensitive material in a direction parallel to the surface of the photosensitive material.
  • Moving means for relatively moving
  • (6) light source Movement control means for controlling movement by the movement means so that the object light and the reference light are incident on a local region where the element hologram is to be formed next in the photosensitive material during a period in which no light is output. It is characterized by having.
  • a method for forming a hologram on a photosensitive material by interfering object light and reference light in each of a plurality of local regions on a photosensitive material and recording an elemental mouth porum dram according to the present invention is provided.
  • the other two coherent lights are branched.
  • the object light and the reference light enter the local area where the element hologram is to be formed next in the photosensitive material during the period when the coherent light is not output from the light source. In this way, the object light optical system and the reference light optical system are sensitive to the photosensitive material! And relatively moving in a direction parallel to the surface of the substrate. .
  • the coherent light output from the light source driven by the pulse current is split into two by the light splitting means.
  • One of the two coherent lights is spatially modulated by the object light optical system and is incident on a local region on the photosensitive material as object light.
  • the other coherent light that has been branched into two is incident on the local region on the photosensitive material as reference light by the reference light optical system.
  • an element hologram is recorded in the local area where the object light and the reference light have entered.
  • the output of the coherent light from the light source is turned off, and the moving means controlled by the movement control means during a period in which no coherent light is output from the light source. Accordingly, the object light optical system and the reference light optical system and the photosensitive material relatively move so that the object light and the reference light enter the local region where the element hologram is to be formed next in the photosensitive material.
  • the light source When the movement is completed, the light source outputs coherent light, and the element hologram is recorded in a new local area. By repeating this, an element hologram is recorded in each of a plurality of local regions on the photosensitive material, and a hologram is created on the photosensitive material.
  • a light source that repeatedly outputs pulsed coherent light by pulse current driving is used, and an element hologram is formed next during a period in which coherent light is not output from the light source.
  • the light-sensitive material is moved so that the object light and the reference light are incident on a local region to be processed. This eliminates the need for a mechanical shutter that generates vibration and an expensive ultrasonic deflection element.
  • the equipment configuration is inexpensive and does not cause vibration problems.
  • the device configuration since a semiconductor laser light source or a solid-state laser light source is used as the light source, the device configuration becomes compact.
  • the light source outputs the coherent light at a constant cycle and a constant duty ratio
  • the movement control means outputs the next element in the photosensitive material during a period when the coherent light is not output from the light source.
  • the movement by the moving means is controlled so that the object light and the reference light are incident on the adjacent local area where the hologram is to be created.
  • the coherent light is output from the light source at a constant cycle and a constant duty ratio, and during the period when the coherent light is not output from the light source, the elemental hologram is then formed on the light-sensitive material.
  • the period during which coherent light is output from the light source is a fixed time
  • the period during which coherent light is not output from the light source is also a fixed time.
  • the object light optical system and the reference light optical system move relative to the photosensitive material during a period in which no coherent light is output from the light source. Therefore, the moving distance from the local area where exposure has been completed to the next local area to be exposed next can always be kept short and constant, and the time required for exposing the entire photosensitive material to create a hologram is minimized. It can be.
  • the light source outputs the coherent light at a constant cycle and a constant duty ratio, it is easy to control the light 3 ⁇ 4S at a constant temperature, and the wavelength of the coherent light output from the light source is stabilized, thereby producing a stable hologram. Becomes possible.
  • the hologram forming apparatus is characterized by further comprising a temperature control means for controlling the temperature of the light source.
  • the hologram creating method according to the present invention is characterized in that the temperature of the light source is controlled when creating the hologram. In this case, controlling the temperature of the light source so as to be within the set temperature range ensures the wavelength stability of the coherent light output from the light source, which is suitable for producing a stable hologram. is there.
  • the temperature control means controls the temperature of the light source so as to be low enough to stably maintain the wavelength of the coherent light output from the light source.
  • the hologram forming method according to the present invention is characterized in that the temperature of the light source is controlled so as to be low enough to stably maintain the wavelength of the coherent light output from the light source.
  • the change in the oscillation wavelength with respect to the unit temperature change at low temperature is smaller, so by controlling the temperature of the light source at a low temperature, a certain amount of drive current pause Even during a period (for example, when the distance to the next local area to be recorded corresponds to substantially one side of the photosensitive material), the light source can be used without causing a relatively change in wavelength.
  • the hologram creation apparatus is characterized in that the hologram creation is started after the stability of the wavelength of the coherent light output from the light source is secured by the temperature control device.
  • the hologram creating method according to the present invention is characterized in that the hologram creation is started after securing the stability of the wavelength of the coherent light output from the light source by temperature control. In this case, after turning on the power to the drive circuit that supplies the drive current to the light source, the element hologram is created after the stability of the wavelength of the coherent light output from the light source is secured. Reliable exposure start timing can be obtained.
  • the temperature control means generally controls the light source temperature based on the difference between the measured temperature of the light source and the set temperature
  • the temperature control means monitors the difference between the measured temperature of the light source and the set temperature, and The stable arrival of the wavelength of the output coherent light can be detected.
  • FIG. 1 is a configuration diagram of a hologram creation device 1 according to the present embodiment.
  • FIG. 2 is a cross-sectional view around the light source 10 of the hologram creating device 1 according to the present embodiment.
  • FIG. 3 is a circuit diagram of a drive circuit that drives the light source 10 of the hologram creation device 1 according to the present embodiment.
  • FIG. 4 shows the ONZZO FF of the horse motion current supplied to the light source 10 and the coherence state of the laser beam output from the light source 10 in the hologram forming apparatus 1 according to the present embodiment.
  • FIG. 7 is a diagram for explaining a change in state, a movement Z stop of stages 61, 63, and 64, and respective timings.
  • FIG. 5 is a diagram illustrating the order in which element holograms are formed on the photosensitive material 2.
  • FIG. 6 is a diagram illustrating the order in which element holograms are formed on the photosensitive material 2.
  • FIG. 7 is a diagram for explaining the order in which element gram images are formed on the photosensitive material 2.
  • FIG. 8 is a view for explaining the order in which element holograms are formed on the photosensitive material 2.
  • FIG. 9 illustrates ON / OFF of the drive current supplied to the light source 10 and stop of the movement of the stages 61, 63, and 64 in the hologram creation apparatus 1 according to the present embodiment, and respective timings.
  • FIG. 9 illustrates ON / OFF of the drive current supplied to the light source 10 and stop of the movement of the stages 61, 63, and 64 in the hologram creation apparatus 1 according to the present embodiment, and respective timings.
  • FIG. 9 illustrates ON / OFF of the drive current supplied to the light source 10 and stop of the movement of the stages
  • FIG. 10 is a circuit diagram of a temperature control circuit that controls the temperature of the light source 10 of the hologram creation device 1 according to the present embodiment.
  • FIG. 11 is an explanatory diagram of a conventional hologram creation technique.
  • FIG. 1 is a configuration diagram of a hologram creation device 1 according to the present embodiment.
  • the light source 10 is controlled by a computer 71 and repeatedly outputs pulsed laser light (coherent light) by pulse current driving.
  • a semiconductor laser light source is preferably used, or a solid-state laser is used.
  • a light source (a laser light output from a semiconductor laser light source as excitation light) is also preferably used.
  • the half mirror 20. Light splitting means) receives the laser light output from the light source 10, reflects a part of the laser light, transmits the remaining part, and splits the laser light into two.
  • the laser light reflected by the half mirror 20 is reflected by the mirror 31, collected by the lens 32, passes through the pinhole 33, is converted into parallel light by the lens 34, and is reflected by the mirror 35.
  • the light enters the spatial light modulator 36.
  • the spatial light modulator 36 is controlled by a high-speed dedicated computer 72 to spatially modulate the input laser light.
  • the modulated laser light is used as object light.
  • the object light output from the spatial light modulator 36 is converged by the lens 37, passes through the mask 38, and is incident on a local region of the light-sensitive material 2 defined by the mask 38. That is, the optical system from the mirror 31 to the mask 38 spatially modulates the laser light reflected by the half mirror 20 as object light, and converts this object light on the photosensitive material 2 Acts as an object light optical system that enters the local area.
  • the relative positional relationship between the spatial light modulator 36 and the lens 37 may have various modes.
  • the spatial light modulator 36 and the lens 37 are arranged in close contact.
  • the spatial light modulator 36 and the lens 37 are arranged in close contact.
  • the computer generated hologram given to the spatial light modulator 36 may be sequentially calculated and provided by the high-speed dedicated computer 72, or may be provided by sequentially reading out images calculated in advance. .
  • the laser beam transmitted through the half mirror 20 is reflected by the mirror 41, and the through hole
  • the light passes through 42, is reflected by the mirror 43, is collected by the lens 44, passes through the pinhole 45, and is converted into parallel light by the lens 46.
  • the laser light output as parallel light by the lens 46 passes through the mask 47, passes through the lenses 48 and 49, is reflected by the mirror 50, and is used as reference light from the back surface of the photosensitive material 2. Incident.
  • the reference light enters the local area of the photosensitive material 2 defined by the mask 38 in the object light optical system.
  • an afocal optical system is configured. That is, the optical system from the mirror 41 to the mirror 50 is a laser transmitted through the half mirror 20. It functions as a reference light optical system that makes light incident on a local region on the photosensitive material 2 as reference light.
  • the X stage 61 holds the photosensitive material 2, and moves the photosensitive material 2 in the X direction by a pulse motor 62.
  • the Y stages 63,64 move the X stage 61 in the Y direction by pulse motors 65,66. Pulse motor 62, 6
  • Each of 5, 6 is controlled by a computer 71.
  • the X direction and the Y direction are parallel to the surface of the photosensitive material 2 and are orthogonal to each other.
  • the X stage 61, the noiseless motor 62, the Y stages 63, 64, and the solenoidless motors 65, 66 use the photosensitive material 2 for the object light optical system and the reference light optical system. Acts as a moving means for relatively moving in a direction parallel to the surface of (2).
  • the computer 71 controls the pulse motors 62, 65, and 66 during a period in which no laser light is output from the light source 10, thereby controlling the X stage 61 and the Y stages 63, 64. Move to specify the local area on the photosensitive material 2 where the element hologram is to be recorded. That is, the computer 71 sets the photosensitive material so that the object light and the reference light are incident on the local region where the element hologram is to be formed next in the photosensitive material 2 during the period when the laser light is not output from the light source 10. Acts as movement control means for controlling the movement of 2.
  • the computer 71 converts the coordinates of the virtual object to be displayed as a front gram into local hologram coordinates based on the position of the local area on the photosensitive material 2 where the element hologram is to be recorded, and calculates the position of the local hologram coordinates.
  • the data is given to the high-speed dedicated computer 72.
  • the high-speed dedicated computer 72 calculates the computer generated hologram and displays it on the spatial light modulator 36, or, in the case of stereogram recording, creates a perspective transformed image and displays it on the spatial light modulator 36. Let it.
  • the computer 71 drives the light source 10 to generate a laser beam, and exposes the photosensitive material 2 by an opening area of the mask 38 to create an element hologram.
  • the computer 71 stops driving the light source 10, moves the photosensitive material 2, and repeats the above operation. Return. In this way, the elementary hologram is recorded in each of the plurality of local regions on the photosensitive material 2, and a hologram / stereogram from the wavefront of the virtual object is created on the photosensitive material 2.
  • FIG. 2 is a cross-sectional view of a light source 10 and its periphery of the mouth gram creating device 1 according to the present embodiment.
  • temperature control means for controlling the temperature of the light source 10 is shown.
  • a case 12 made of copper or the like having a high thermal conductivity is placed on a heat insulating support 11 made of a material having a high heat insulating property such as acrylic, and a Peltier element or the like is placed on the case 1 2.
  • An electronic cooler 13 is arranged, and a radiator plate 14 is arranged on the electronic cooler 13.
  • a light source 10 driven by a current and an optical component 15 such as a lens are sealed in the case 12.
  • FIG. 3 is a circuit diagram of a drive circuit that drives the light source 10 of the hologram creation device 1 according to the present embodiment.
  • This drive circuit includes resistors R1, R2, R3 and a transistor Tr.
  • the power source terminal of the semiconductor laser light source which is the light source 10 is connected to the emitter terminal of the transistor Tr via the resistor R1 and directly to the collector terminal of the transistor Tr. I have.
  • the anode terminal of the light source 10 is connected to the base terminal of the transistor Tr via the resistor R2 and the resistor R3.
  • the power supply voltage Vcc is supplied to a position between the resistor R2 and the resistor R3. Further, a control signal for controlling the output of the laser light from the light source 10 is supplied to the base terminal of the transistor Tr.
  • the transistor Tr When the base terminal of the transistor Tr is grounded by an open collector or the like so that the base terminal has the same potential as the emitter terminal, the transistor Tr is turned off, and the light source 10 is turned off.
  • the bias current state immediately before light emission is determined by the power supply voltage Vcc and the resistance values of the resistors R 1 and R 2.
  • the base current flows from the resistor R3 by electrically disconnecting the base terminal and the emitter terminal of the transistor Tr, and the transistor Tr is turned on.
  • the light source 10 emits light by the drive current determined by the power supply voltage Vcc and the resistance value of the resistor R2.
  • the circuit shown in Fig. 3 is a basic circuit.In practice, a protection diode and a capacitor to protect the light source 10 and a coil to suppress overshoot and undershoot of the drive current Parts such as are used. Further, the present invention is not limited to a mode in which the drive current during the light emission period is constant, and may be a drive using a high-frequency current.
  • an ACC (automatic current control) driving method in which a constant driving current is held by a driving circuit as shown in FIG. 3 is known.
  • An APC (automatic power control) drive method is also known that monitors the output of a photodiode enclosed in a package and controls a semiconductor laser light source to obtain a constant light output.
  • FIG. 4 shows ONZOFF of the drive current supplied to the light source 10, changes in the coherence state of the laser light output from the light source 10, and the stages 61
  • Fig. 6 is a diagram for explaining the stopping of movement at 63 and 64 and the timing of each.
  • the light source 10 repeatedly outputs pulsed laser light by pulse current driving. Immediately after the output of the laser beam from the beam 110, the laser beam has low coherence and is unsuitable for recording an element hologram. However, compared to the period in which the laser light is output from the light source 10, the state where the coherence is low ends in a short time. Therefore, a period in which the coherence is high is a period in which the element hologram is substantially recorded.
  • the stages 61, 63, and 64 are stopped during the period when the laser light is output from the light source 10, and during the period when the laser light is not output from the light source 10, the photosensitive material 2 Next, the photosensitive material 2 is moved so that the object light and the reference light are incident on a local region where an element hologram is to be formed.
  • the light source 10 repeats ONZOFF at a constant period, so that the heat generated by the drive current of the light source 10 and the temperature control mechanism are balanced for a long time, and stable interference recording can be performed.
  • the hologram creating method uses the hologram creating apparatus 1 according to the above-described embodiment to cause an element hologram to interfere with object light and reference light in each of a plurality of local regions on the photosensitive material 2.
  • a hologram is created on the photosensitive material 2 by recording. That is, in the hologram creation method according to the present embodiment, under the control of the computer 71, the pulsed laser light is repeatedly output from the light source 10 driven by the pulse current, and the laser light output from the light source 10 is output. Is split into two by a half mirror 20.
  • the laser light reflected by the half mirror 20 is spatially modulated by the spatial light modulator 36 by the object light optical system, and the modulated laser light is used as object light in a local region on the photosensitive material 2. Make it incident.
  • the reference light optical system causes the laser light transmitted through the half mirror 20 to enter a local region on the photosensitive material 2 as reference light.
  • the object light optical system and the reference light optical system are set so that the object light and the reference light enter the local region where the element hologram is to be formed next in the photosensitive material 2.
  • the photosensitive material 2 is relatively moved in a direction parallel to the surface of the photosensitive material 2.
  • a hologram is created on the photosensitive material 2 by recording an element hologram in each local area.
  • examples and comparative examples will be described.
  • a He-Ne laser light source output power 1 mW
  • a mechanical shirt with 0.5 seconds
  • about 10,000 element holograms were recorded for 4 hours, and defects occurred at a rate of about 1%.
  • a semiconductor laser light source (output wavelength: 65 nm, output power: 20 mW) is used as the light source 10, the ON period is 1 second, and the OFF period is 0.5 second.
  • the light source 10 was pulsed and the light source 10 was controlled at a constant temperature of 20 ° C ⁇ 0.1 ° C, and approximately 10,000 element holograms were recorded for 4 hours, there was a defect. The number of element holograms was 0.
  • a pumped YAG laser (output wavelength: 532 nm, output power: 3 mW) using laser light output from a semiconductor laser light source as pump light is used as the light source 10.
  • the ON period set to 1 second and the OFF period set to 0.5 seconds
  • the light source 10 is pulse-driven, and the light source 10 is controlled at a constant temperature of 20 ° C ⁇ 0.1 ° C.
  • the number of defective elementary holograms was 0.
  • the light source 10 that repeatedly outputs pulsed laser light by pulse current driving is used, and the laser light is emitted from the light source 10.
  • the photosensitive material 2 is moved so that the object light and the reference light are incident on a local region where an element hologram is to be formed next during a period in which the element hologram is not output. This eliminates the need for a mechanical shirt that generates vibration and an expensive ultrasonic deflecting element, thereby reducing the cost of the device configuration and preventing the problem of vibration. Further, since a semiconductor laser light source or a solid-state laser beam is used as the light source 10, the device configuration becomes compact.
  • FIG. 6 is a diagram for explaining an order of creating element holograms in material 2.
  • the shape of each local area where the element hologram is recorded may be a square or a rectangle, a circle or an ellipse.
  • the moving distance from the local area after exposure to the local area to be exposed next is always the shortest and constant.
  • Each local area is sequentially exposed, and similarly, each local area is sequentially exposed in a zigzag manner.
  • the first is to expose the local area at row 5, column 5 in the center
  • the second is to expose the local area at row 5, column 6 to the right
  • the third is to expose the local area.
  • the light source 10 outputs laser light at a constant cycle, and the duty ratio (the ratio between the output period and the stop period) is fixed. By doing so, it becomes easy to control the light source 10 at a constant temperature, the wavelength of the laser light output from the light source 10 is stabilized, and a stable hologram can be created.
  • the element hologram creation order shown in FIG. 8 is effective when the element hologram creation order shown in FIGS. 5 to 7 cannot be implemented for some reason.
  • the order of the images displayed on the spatial light modulator 36 is received as time-series data in a form that is restricted from a long distance, or when the stage drive mechanism is an inexpensive mechanism, a back crash that cannot be ignored In some cases, it is necessary to keep moving in one direction in order to move to the correct position.
  • a spectrometer, a holographic interferometer, a Michelson interferometer, or a Mach-Zehnder interferometer that uses coherence of a semiconductor laser light source and uses a semiconductor laser light source with constant current driving without pauses.
  • the constant temperature of the semiconductor laser light source is close to room temperature.
  • the semiconductor laser light source is controlled at a constant temperature to stabilize the wavelength of the semiconductor laser light source and the semiconductor laser-excited solid-state laser light source.
  • the change in the oscillation wavelength with respect to the unit temperature change at a low temperature is smaller than that with the unit temperature change at a high temperature. Therefore, by controlling the temperature to be as low as possible, the light source 10 can be used without relatively changing the wavelength even if there is a certain period of suspension of the drive current.
  • the rest period that does not cause the oscillation wavelength change depends on the constant temperature control ability, but the ON period is 1 second using a semiconductor laser light source (output wavelength: 65500 nm, output power: 20 mW) as the light source 10.
  • the OFF period is set to 0.5 seconds and the light source 10 is pulse-driven to give a rest time of 20 °>
  • the constant temperature control is performed at a room temperature of 25 ° C
  • the light source is used from the start to the end
  • the wavelength stability of the laser light output from the laser light source 10 has been described above.However, in the following, it is necessary to turn on the power to the drive circuit that supplies the drive current to the light source 10 and then obtain a reliable exposure start timing. The method will be described. As a preparatory step for hologram imaging, it is necessary to confirm that the interference fringes are stationary to ensure wavelength stability.
  • FIG. 10 is a circuit diagram of a temperature control circuit that controls the temperature of the light source 10 of the frontal gram creating device 1 according to the present embodiment.
  • This temperature control circuit is a circuit with a monitor output indicating that the temperature of the light source 10 is within a set temperature range.
  • the reference voltage generator 81 generates a voltage corresponding to the upper limit temperature of the set temperature range.
  • the reference voltage generator 82 generates a voltage V 2 corresponding to the lower limit temperature of the set temperature range.
  • the resistors R 4 and R 5 are connected in series with each other, and are provided between the output terminal of the reference voltage generator 81 and the output terminal of the reference voltage generator 82. and it outputs the voltage V 3 of the value between the voltage and the voltage V 2 to the connection point between the two Te.
  • the differential amplifier 83 has its non-inverting input terminal connected to the connection point between the resistor R4 and the resistor R5, and its inverting output terminal connected to the output terminal of the linearize circuit 84.
  • the realizing circuit 84 inputs the current of a thermistor (temperature sensor) 18 that detects the temperature of the light source 10 based on the resistance value, shapes the waveform, linearly amplifies the current, and converts it into a voltage value. Outputs the voltage V 4 to the inverting input terminal of the differential amplifier 83.
  • a thermistor temperature sensor
  • the differential amplifier 83 has a voltage V 3 corresponding to the set temperature of the light source 10 (voltage value input to the non-inverting input terminal) and a voltage V 4 corresponding to the measured temperature of the light source 10 (input to the inverting input terminal). outputting a difference voltage V 5 and obtains the difference between the voltage value).
  • Proportional circuit 8 5 inputs the voltage V 5 output from the differential amplifier 8 3, and outputs a voltage proportional to the value of the voltage V 5.
  • Integrator circuit 8 6 inputs the voltage V 5 output from the differential amplifier 8 3 integrates the value of the voltage V 5, and outputs a voltage corresponding to the integrated value.
  • the current booster circuit 87 receives the voltage output from each of the proportional circuit 85 and the integrating circuit 86 and outputs a current having a value corresponding to this voltage to the Peltier element (electronic cooler) 13. That is, the temperature of the light source 10 is kept constant by PI control.
  • Voltage comparator 8 8 a voltage corresponding to the upper limit temperature of the set temperature range that is output from the reference voltage generator 81 is input to the non-inverting input terminal, the voltage V 5 output from the differential Anpu 8 3 Input to the inverting input terminal, compare these two voltage values, and output the logical value H if the measured temperature of the light source 10 is lower than the upper limit of the set temperature range. Output a logical value L.
  • Voltage comparator 8 9 a voltage V 2 corresponding to the lower limit temperature of the set temperature range are output from the reference voltage generator 8 2 inputted to the inverted input terminal, the voltage V 5 output from the differential amplifier 8 3 Is input to the non-inverting input terminal, and the values of these two voltages are compared. If the measured temperature of the light source 10 is higher than the lower limit of the set temperature range, the logical value H is output. Outputs a logical value L.
  • the AND circuit 90 receives the logical values output from the voltage comparators 88 and 89, calculates the logical product of these two logical values, and outputs a logical value indicating the result of the logical product.
  • the computer 71 determines whether the measured temperature of the light source 10 is within the set temperature range by monitoring the logical value output from the logical product circuit 90, and determines the wavelength of the light source 10 When the stabilization is detected, the actual aperture durum exposure can be started in a short time after the power supply to the drive circuit for driving the light source 10 is turned on.
  • the present invention can be used for a hologram forming apparatus and method.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

Selon la présente invention, un faisceau laser pulsé est produit de manière répétée à partir d'une source lumineuse (10) commandée par un courant impulsionnel, et le faisceau laser produit à partir de cette source lumineuse (10) est divisé par un demi-miroir (20). Le faisceau laser réfléchi par le demi-miroir (20) est spatialement modulé par un dispositif (36) de modulation de lumière spatial et ce faisceau laser modulé entre au niveau d'une zone locale d'une matière photosensible (2) en tant qu'une lumière objet. Le faisceau laser ayant pénétré à travers le demi-miroir (20) entre dans une zone locale de la matière photosensible (2) en tant que lumière de référence. Lorsqu'un faisceau laser n'est pas produit à partir de la source lumineuse (10), la matière photosensible (2) est déplacée, de manière parallèle à sa face, par rapport à la source lumineuse, de sorte que la lumière objet et la lumière de référence peuvent entrer au niveau d'une zone locale suivante de la matière photosensible (2) où un hologramme doit être formé.
PCT/JP2002/001092 2001-02-08 2002-02-08 Appareil et procede de formation d'hologrammes WO2002063399A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001032752A JP2002236441A (ja) 2001-02-08 2001-02-08 ホログラム作成装置および方法
JP2001-32752 2001-02-08

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WO2002063399A1 WO2002063399A1 (fr) 2002-08-15
WO2002063399A9 true WO2002063399A9 (fr) 2003-01-23

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Publication number Priority date Publication date Assignee Title
GB0301317D0 (en) * 2003-01-21 2003-02-19 Holographic Imaging Llc Image projection device and method
JP4369762B2 (ja) 2004-01-06 2009-11-25 Ｔｄｋ株式会社 ホログラフィック記録方法及びホログラフィック記録装置
JP4534516B2 (ja) * 2004-02-18 2010-09-01 ソニー株式会社 ホログラム記録再生装置
JP4715469B2 (ja) * 2005-11-28 2011-07-06 株式会社島津製作所 波長変換レーザ温度制御回路
CN105068397A (zh) * 2015-09-14 2015-11-18 中国工程物理研究院激光聚变研究中心 一种量子级联激光器太赫兹源数字全息成像系统

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JPH088388B2 (ja) * 1989-05-15 1996-01-29 富士通株式会社 光部品の温度安定化方法及び装置
JPH0541166U (ja) * 1991-11-06 1993-06-01 株式会社小松製作所 半導体レーザのマウント構造
JP4108823B2 (ja) * 1998-04-14 2008-06-25 浜松ホトニクス株式会社 ホログラム作成装置
JP4207260B2 (ja) * 1998-09-03 2009-01-14 ソニー株式会社 画像記録装置

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