Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-08-08
2006-08-08
Boutsikaris, Leonidas (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S566000, C369S112030
Reexamination Certificate
active
07088513
ABSTRACT:
A diffraction element includes a light-transmittable member and a diffraction grating formed on at least one face of the light-transmittable member. When a first laser beam having a first wavelength λ1 and a second laser beam having a second wavelength λ2 are transmitted through the diffraction element at first and second diffraction efficiencies, respectively, the diffraction element functions to equalize the first and second diffraction efficiencies to each other by only the one face of the diffraction element. The diffraction grating has a first phase modulation amount ø1 for the first laser beam and a second phase modulation amount ø2 for the second laser beam and the first and second phase modulation amounts ø1 and ø2 are, respectively, approximate to (2πN1±Δø) and (2πN2±Δø) in which “N1” and “N2” are natural numbers and “Δø” is a phase variation amount.
REFERENCES:
patent: 2005/0141391 (2005-06-01), Ueyama et al.
patent: 2005/0163018 (2005-07-01), Yukawa
patent: 2001-281432 (2001-10-01), None
patent: 2002-245660 (2002-08-01), None
patent: 2002-311219 (2002-10-01), None
Komma Yoshiaki
Sano Kousei
Tanaka Toshiyasu
Boutsikaris Leonidas
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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