13 February 2008 Observation of the photoscattering effect from supercontinuum-generating germanosilicate fiber
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We observe a photosensitivity apparently different from that associated with fiber grating inscription in a supercontinuum-generating germanosilicate fiber. Transmission of intense femtosecond ~800 nm pulses in the heavily Ge-doped fiber progressively produces a waveguide at the entrance of the fiber. The waveguide behaves as a multi-millimeter long fiber bandpass filter which scatters away light with wavelength shorter or longer than 850 nm. This photosensitivity is therefore termed as the photoscattering effect. A model incorporating color center formation is proposed to explain the underlying mechanism. A 5-photon absorption process likely serves as the common origin of this effect and the ~800 nm photosensitivity producing low-loss waveguides in bulk silica glass and Type I-IR fiber Bragg gratings in side written optical fibers.
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Haohua Tu, Daniel L. Marks, Stephen A. Boppart, "Observation of the photoscattering effect from supercontinuum-generating germanosilicate fiber", Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750Z (13 February 2008); doi: 10.1117/12.763000; https://doi.org/10.1117/12.763000


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