WIDE BAND PHASE PLATE

WIDE BAND PHASE PLATE

PROBLEM TO BE SOLVED: To provide a wide band phase plate capable of being used for an optical head device used for three-wavelength compatibility.SOLUTION: A wide band phase plate includes a layer 304 composed of a birefringent material and one transparent substrate 301 holding the layer 304 compose...

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Hauptverfasser: KAKIUCHI TOSHIMASA, KUMAI YUTAKA, NASHI KOKI, TAKATANI CHIKASHI
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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creator KAKIUCHI TOSHIMASA
KUMAI YUTAKA
NASHI KOKI
TAKATANI CHIKASHI
description PROBLEM TO BE SOLVED: To provide a wide band phase plate capable of being used for an optical head device used for three-wavelength compatibility.SOLUTION: A wide band phase plate includes a layer 304 composed of a birefringent material and one transparent substrate 301 holding the layer 304 composed of the birefringent material. The wide band phase plate generates respective phase differences of about (2m-1)×λ/4 for a light flux of 410 nm wavelength band, about (2m-1)×λ/4 for a light flux of 660 nm wavelength band, and about m×λ for a light flux of 780 nm wavelength band (λ is a wavelength, and m, mand mare natural numbers).
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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
title WIDE BAND PHASE PLATE
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