Femtosecond-pulse modification of the refractive index in transparent materials enables the inscription of fiber Bragg gratings with new features and extended capabilities. In this study we present the results of fiber Bragg gratings inscription in Corning 62.5/125 multimode graded index fiber with IR femtosecond laser pulses. The specifics of point-by-point inscription including single and multiple Bragg grating inscription in limited fiber segment as well as different transverse modes excitation/suppression is discussed. Multimode fiber Bragg gratings inscribed with femtosecond radiation are investigated for the first time directly in the Raman fiber laser cavity.
Alexandr V. Dostovalov, Alexey A. Wolf, Ekaterina A. Zlobina, Sergey I. Kablukov, and Sergey A. Babin, "Femtosecond-pulse inscription of fiber Bragg gratings in multimode graded index fiber," Proc. SPIE 10091, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXII, 100910L (Presented at SPIE LASE: January 31, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2251337.
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