Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2007-08-14
2007-08-14
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C430S290000, C430S321000
Reexamination Certificate
active
11087740
ABSTRACT:
The invention provides a method for processing a transparent material, which is applicable to universal materials and by which the propagation loss of an optical function device produced by changing the refractive index is slight. Femtosecond laser pulses are condensed by a lens, and a glass material being fused quartz is relatively moved, wherein a waveguide is formed by forming a continuous high refractive index area. Prior art optical pulses depicted in FIG.1(a) are one-by-one femtosecond laser pulses at a pulse interval which is slightly shorter or longer than a thermal diffusion time (1 μs) of a substance. Optical pulses according to the invention, which are depicted in FIG.1(b) are irradiated while using, as a set, two femtosecond laser pulses with a pulse interval which is around the electron lattice energy relaxation time (1 through 100 ps) of a substance.
REFERENCES:
patent: 6993221 (2006-01-01), Mihailov et al.
patent: 2001/0021293 (2001-09-01), Kouta et al.
patent: 2005/0226287 (2005-10-01), Shah et al.
patent: 09-311237 (1997-12-01), None
patent: 2002-311277 (2002-10-01), None
Kamata Masanao
Nagata Tetsuya
Obara Minoru
Chu Chris
Connelly-Cushwa Michelle
Edward Angell Palmer & Dodge LLP
Keio University
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