摘要:
A laser processing apparatus 1 includes a laser light source 10, a phase modulation type spatial light modulator 20, a driving unit 21, a control unit 22, and an imaging optical system 30. The imaging optical system 30 may be a telecentric optical system. A storage unit 21A included in the driving unit stores a plurality of basic holograms corresponding to a plurality of basic processing patterns and a focusing hologram corresponding to a Fresnel lens pattern. The control unit 22 arranges in parallel two or more basic holograms selected from the plurality of basic holograms stored in the storage unit 21A, overlaps the focusing hologram with each of the basic holograms arranged in parallel to form the whole hologram, and presents the formed whole hologram to the spatial light modulator 20.
摘要:
A laser processing apparatus 1 includes a laser light source 10, a phase modulation type spatial light modulator 20, a driving unit 21, a control unit 22, and an imaging optical system 30. The imaging optical system 30 may be a telecentric optical system. A storage unit 21A included in the driving unit stores a plurality of basic holograms corresponding to a plurality of basic processing patterns and a focusing hologram corresponding to a Fresnel lens pattern. The control unit 22 arranges in parallel two or more basic holograms selected from the plurality of basic holograms stored in the storage unit 21A, overlaps the focusing hologram with each of the basic holograms arranged in parallel to form the whole hologram, and presents the formed whole hologram to the spatial light modulator 20.
摘要:
A convolution integrator that can be used favorably to prepare, at high speed, a computer generated hologram that can reproduce a reproduction image formed by reproduction points at various distances and differing in initial phase is provided. A plurality of element processors PE are practically cascade-connected. Each element processor PE includes: a constant generator 91A, outputting a propagation function value that is generated based on a coordinate value Z and an initial phase value P; a multiplier 92, multiplying the propagation function value and a luminance value I and outputting the product value; an adder/subtractor 93, performing addition/subtraction on the product value and a hologram time series signal PDin and outputting the sum/difference value; and a register 94, receiving, holding, and then outputting the sum/difference value as a hologram time series signal PDout. The hologram time series signal PDout, output from a register 94 of an element processor of a preceding stage that is cascade-connected, is input as the hologram time series signal PDin into an adder/subtractor 93 of an element processor of a subsequent stage.
摘要:
In the method for producing holograms, a plurality of images displayed on a spatial optical modulating element 6 is used as the object light. Through a lens array 7 composed of a plurality of lenses disposed corresponding to each of the images, which are included in the object light, and a reducing optical system 9 and 10 for reducing the object light emitted from the lens array 7, the object light is made to irradiate a recording surface 11 along with a reference light; thereby interference light between the object light and the reference light is recorded on the recording surface 11. Between the spatial optical modulating element 6 and the lens array 7, partitions 15 for separating the respective images are provided; thereby noise is reduced.
摘要:
Young's interferometer consisting of a single slit and a double slit member, and an analyzer are arranged along the axis of light to be measured. Parallel slits of the double slit member are provided with respective polarizers whose paralyzing directions are at .+-.45.degree. to the longitudinal direction of the parallel slits. The polarizing direction of the analyzer is set in parallel with the parallel slits. The incident light passes through Young's interferometer and the analyzer to form an interference fringe, which is detected by an image detector unit. An image analyzer unit produces an intensity profile of the interference fringe and determines the polarization state of the incident light, for instance, by comparing the produced intensity profile with conceivable profiles stored in advance.
摘要:
A deformation measuring method and device in which an object is irradiated with a laser beam before and after deformation of the object to obtain speckle patterns, the speckle patterns thus obtained are photoelectrically converted into electrical signals, and the cross-correlation function between the speckle patterns is calculated using the electrical signals to obtain displacement of the speckle pattern on the basis of the shift of position of the extreme value of the cross-correlation function and to determine the amount of deformation of the object from the displacement of the speckle pattern. Each of photosensitive elements for converting the speckle patterns into the electrical signals has a rectangular form of a large ratio of a long side to a short side and a photosensitive element array comprising the photosensitive elements has a comb structure in which the photosensitive elements having the above structure are arranged in a strip form.
摘要:
The distance between a spatial light modulating device 7 and a lens 8 is set such that a real or virtual image position 9, 9′ (L, L′) of object light formed by the lens 8 is an observing position of a hologram 12′. Since a reconstructed image is fixed at the observing position L, L′, noise existing in the reconstructed image of the spatial light modulating device 7′ if any is fixed at the observing position and thus is unremarkable as noise, whereby the noise is substantially lowered.
摘要:
An optical digital holding apparatus of the present invention carries out functions of a flip-flop apparatus (RS flip-flop, D flip-flop etc.) which are one kind of electrical digital holding apparatus, and can be achieved by placing optical connecting wiring having a direct or indirect feedback circuit between multistage optical selectors having selector functions. The optical digital holding apparatus of the present invention includes multistage selectors which receive an aggregation of spatially distributed optical digital information signals propagating in a predetermined direction and bearing binary digital information and an optical control signal bearing binary digital information. These selectors selectively output a portion of an aggregation of the digital information signals received in accordance with a value of the digital information carried by the optical control signal. The optical digital holding apparatus also includes optical connection wiring for connecting an output optical signal of one of the selectors to an input optical signal of one of the other selectors.
摘要:
An optical heterodyne detector comprising means for causing two light beams to interfere with each other and producing interference light beams thereof, a streak camera for receiving the interference light beams and analyzing means for analyzing an output of the streak camera, thereby to detect a beat frequency of the two light beams.
摘要:
The present invention relates to a three-dimensional image displaying apparatus, or the like, that has a simple structure capable of displaying a high-quality reconstruction image by effectively making use of the focusing function of the observer's eyes. The three-dimensional image displaying apparatus comprises a spatial light modulation element, an illumination optical system, and a lens as a reconstruction image converting optical system. At least one of the bright point interval and initial phase values of the respective bright points constituting a target reconstruction image to be displayed is set such that peaks of the reconstruction light reaching a region, where the observation of reconstruction image obtained through diffraction of a specified order in the spatial light modulation element is permitted, are produced at different plural points on the back focal plane of the lens. As a result, a hologram capable of displaying the target reconstruction image is expressed by the spatial light modulation element. The amplitude or phase of the illumination light that enters the spatial light modulation element expressing the hologram is modulated by each pixel. The modulated light, that is, the reconstruction light is wavefront-converted by the lens and thereby the reconstruction image is formed. The observer, whose eye pupil is disposed close to the aperture portion of the mask, can observe a displayed reconstruction image through the aperture portion and a half mirror.