Optical: systems and elements – Lens
Reexamination Certificate
2007-01-09
2007-01-09
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Lens
C359S646000
Reexamination Certificate
active
10793334
ABSTRACT:
The present invention relates to an optical device having a structure that can make the diameter of the emitted Gaussian beam smaller. The optical device is arranged between a first and second positions, and comprises a first and second optical systems separated with a focus on an intermediate position between the first and second positions. The first optical system, arranged between the first and intermediate positions, comprises a first light entrance surface on which a Gaussian beam having a beam waist, whose radius becomes w0at the first position, is incident, and a first light emission surface from which a Gaussian beam having a beam waist, whose radius becomes w1at the intermediate position, is emitted. The second optical system, arranged between the intermediate and second positions, comprises a second light entrance surface on which the Gaussian beam emitted from the first optical system is incident, and a second light emission surface from which a Gaussian beam having a beam waist, whose radius becomes w2at the second position, is emitted. The radial ratio of the beam waists (w2/w0) is set so as to become smaller than a geometrical-optical lateral magnification of the optical device.
REFERENCES:
patent: 5040886 (1991-08-01), Gunter
patent: 5946141 (1999-08-01), Harrigan
D. M. Marom et al.; “Wavelength-Selective 1×4 Switch for 128 WDM Channels at 50 GHz Spacing”;OFC 2002 Postdeadline Papers; c. 2002; pp. FB7-1-FB7-3; Optical Society of America; USA.
Ikeda Yuji
Takeyama Norihide
Takushima Michiko
Genesia Corporation
Hasan M.
McDermott Will & Emery LLP
Sumitomo Electric Industries Ltd.
Thompson Timothy
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