Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Makoto Kato"'
Publikováno v:
Applied optics. 31(35)
The best configuration for holographic optical heads for compact disk players is discussed from the viewpoint of considering the misalignment allowance for head components. Focus-error and trackingerror signals of the proposed head configurations are
Autor:
Yoshikazu Nakayama, Makoto Kato
Publikováno v:
Applied optics. 20(13)
Publikováno v:
Applied optics. 14(5)
High quality holograms of flat objects are produced by developing an achromatic-fringe system that consists of a monochromatic but spatially incoherent source, a holographic beam splitting device, and a pair of Fourier transform lenses. The effects o
Publikováno v:
Applied optics. 47(12)
Here we present multiple-wavelength digital holographic interferometry with a wide measurement range using laser diodes. Small wavelength differences can be easily realized by the wavelength tuning of laser diodes with injection current controls. A c
Publikováno v:
Applied Optics. 34:5361
Grating feedback optics is shown to contribute to narrowing the spectral bandwidth of a multilongitudinal-mode laser diode to less than 0.2 nm and tuning the lasing wavelength to the peak absorption wavelength of Nd:YVO(4). A continuous green light o
Publikováno v:
Applied Optics. 29:5127
A CGH construction of a holographic optical element (HOE) for an optical disk head with spot-size detection by means of superimposing two Fresnel zone plates is studied. Optimum parameter values for the ratio of segment to grating pitch (duty) and gr
Publikováno v:
Applied Optics. 29:2522
A focusing grating mirror (FGM), which is a new computer generated holographic grating with functions of focusing lens and diffraction grating mirror, is proposed and fabricated, we believe, for the first time. A high speed and accurate electron beam
Autor:
Makoto Kato, Isao Satoh
Publikováno v:
Applied Optics. 27:2987
A novel 2-D holographic disk recording of binary data is proposed and discussed as an alternative to the bitby- bit recording disk. Using a double diffraction optical system with a holographic beam splitter, the disk holds interference fringes on a h
Autor:
Yoshikazu Nakayama, Makoto Kato
Publikováno v:
Applied Optics. 21:1410
The linear recording of a Fourier transform hologram of a 2-D object using a pseudorandom diffuser is described. The recording condition is determined by two parameters: (1) intensity ratio of the reference-to-object beam; and (2) exposure energy of
Autor:
Makoto Kato, Yoshihiro Okino
Publikováno v:
Applied Optics. 12:1199
A method of speckle reduction in holography for 2-D objects with minimum recording area is presented. The image is incoherently synthesized from the hologram double recorded with a set of random phase plates.