METHOD FOR WRITING HIGH POWER RESISTANT BRAGG GRATINGS USING SHORT WAVELENGTH ULTRAFAST PULSES FIELD OF THE INVENTION The present invention relates to the field of Bragg gratings manufacturing and more
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چکیده
A method for writing a Bragg grating in a glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and 5 having a writing wavelength in the range of 300nm to 700nm and an intensity sufficient to induce a change of refractive index in the waveguide through densification. The optical pulses are diffracted using a phase mask, to generate an interference pattern having a pitch providing a fundamental Bragg resonance corresponding to the target wavelength to be reflected by the grating. The 10 interference pattern is impinged on a region of the waveguide, which is heated to a temperature above a threshold and for a predetermined heating period. Advantageously, the heating step allows the reduction of photoinduced losses which would otherwise be present in the waveguiding properties of the waveguide. Optionally, gratings may be written through the polymer jacket of an optical fiber. 15
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تاریخ انتشار 2012