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Applied Optics

Applied Optics


  • Vol. 51, Iss. 12 — Apr. 20, 2012
  • pp: 1828–1835

Analysis on the saturation of refractive index modulation in fiber Bragg gratings (FBGs) written by partially coherent UV beams

Ramakanta Mahakud, Om Prakash, Shankar V. Nakhe, and Sudhir Kumar Dixit  »View Author Affiliations

Applied Optics, Vol. 51, Issue 12, pp. 1828-1835 (2012)

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We present an analysis on the saturation of refractive index modulation of fiber Bragg gratings written in nonhydrogenated Ge-B co-doped single-mode photosensitive optical fiber by partially coherent pulsed UV beams. The UV beams of different spatial coherence properties were generated by second harmonic conversion of high repetition rate, high average power copper vapor laser (CVL) oscillators with different optical resonators. It is observed that for UV beams of higher spatial coherence, the fiber Bragg grating reflectivity growth was faster and saturation of refractive index modulation was higher. The experimental results are explained with the help of a physical model based on exponential decay of defect centers per unit volume on UV absorption in the fiber core. The subsequent increase in the refractive index was attributed to the structural modification and densification of the fiber core.

© 2012 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(230.1480) Optical devices : Bragg reflectors
(140.3515) Lasers and laser optics : Lasers, frequency doubled
(060.3738) Fiber optics and optical communications : Fiber Bragg gratings, photosensitivity
(160.5335) Materials : Photosensitive materials

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 28, 2011
Revised Manuscript: February 8, 2012
Manuscript Accepted: February 8, 2012
Published: April 11, 2012

Ramakanta Mahakud, Om Prakash, Shankar V. Nakhe, and Sudhir Kumar Dixit, "Analysis on the saturation of refractive index modulation in fiber Bragg gratings (FBGs) written by partially coherent UV beams," Appl. Opt. 51, 1828-1835 (2012)

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