G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/18 (2006.01)
Patent
CA 2669437
A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000 °C and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least hours at a temperature of at least 1000 °C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.
Cuglietta Gino
Dai Xiaoli
Ding Huimin
Grobnic Dan
Lu Ping
Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Industry Through The Communica
Teitelbaum & Maclean
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