Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Reexamination Certificate
2005-05-10
2009-06-16
Feild, Joseph H (Department: 2627)
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
C369S103000, C369S112040, C369S112070, C369S044370
Reexamination Certificate
active
07548359
ABSTRACT:
A double-wavelength light source unit capable of stable signal detection, is realized.The double-wavelength light source unit comprises a double-wavelength light source, a photodetector and a double-wavelength diffraction element, wherein the double-wavelength diffraction element comprises a diffraction grating which transmits a light beam of λ1and diffracts a light beam of λ2among the light beams of wavelengths λ1and λ2(λ1≠λ2) emitted from two laser diode diodes as the double-wavelength light source, a diffraction grating which diffracts a light beam of λ1and transmits a light beam of λ2, a diffraction grating constituted by a grating-material forming a grating and a filler which transmits a light beam of λ1since the refractive indices of both of these materials are equal at λ1and diffracts a light beam of λ2since the refractive indices are different at λ2, and a diffraction grating which transmits a light beam of λ1having a first polarization plane and diffracts a light beam of λ1having a polarization plane perpendicular to the first polarization plane.
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Murakami Ryota
Ooi Yoshiharu
Asahi Glass Company Limited
Feild Joseph H
Gupta Parul
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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