Fiber Bragg reflectors by single excimer pulse

Charles G. Askins; Glen M. Williams; Mark Bashkansky; E. Joseph Friebele

doi:10.1117/12.141323

26 March 1993 Fiber Bragg reflectors by single excimer pulse

Charles G. Askins, Glen M. Williams, Mark Bashkansky, E. Joseph Friebele

Proceedings Volume 1798, Fiber Optic Smart Structures and Skins V; (1993) https://doi.org/10.1117/12.141323
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

In-fiber Bragg reflectors produced with coherent, transverse UV illumination promise to be versatile optical elements for spectral selection and distributed sensing. These fiber devices were generated by repetitive exposures to a moderate intensity, frequency-doubled dye laser under holographically stable conditions until sufficient periodic index modulation had accumulated to produce a strong reflection. Fluences in the range of 1000 J/sq cm were delivered over the course of many seconds to minutes to obtain an index modulation depth of about 1 x 10 exp -4. In an alternate approach, we used single about 1 J/sq cm pulses from a line-narrowed KrF excimer to produce gratings with a modulation depth of about 2 x 10 exp -5, and more recently have achieved values above 1 x 10 exp -4. An unanticipated benefit of the single-pulse preparation method appears to be the markedly enhanced thermal stability of the grating structure, as compared to that reported for gratings produced with multiple exposures.

Citation Download Citation

Charles G. Askins, Glen M. Williams, Mark Bashkansky, and E. Joseph Friebele "Fiber Bragg reflectors by single excimer pulse", Proc. SPIE 1798, Fiber Optic Smart Structures and Skins V, (26 March 1993); https://doi.org/10.1117/12.141323

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