Abstract

We compare the cladding patterns present in grating structures fabricated with an ultrafast laser and a phase mask with a cw beam interference model. We find that the observed patterns agree well with the model results for picosecond pulses; however, for femtosecond pulses, we show that the full bandwidth and the pulsed nature of the sources must be considered because the pattern can be affected by group-velocity walk-off. An interesting consequence of order walk-off is the possibility of pure two-beam interference generation with a phase mask in the femtosecond pulse regime.

© 2004 Optical Society of America

Generation of pure two-beam interference grating structures in an optical fiber with a femtosecond infrared source and a phase mask

C. W. Smelser, D. Grobnic, and S. J. Mihailov
Opt. Lett. 29(15) 1730-1732 (2004)

Hydrogen loading for fiber grating writing with a femtosecond laser and a phase mask

Christopher W. Smelser, Stephen J. Mihailov, and Dan Grobnic
Opt. Lett. 29(18) 2127-2129 (2004)

Fiber Bragg gratings made with a phase mask and 800-nm femtosecond radiation

Stephen J. Mihailov, Christopher W. Smelser, Ping Lu, Robert B. Walker, Dan Grobnic, Huimin Ding, George Henderson, and James Unruh
Opt. Lett. 28(12) 995-997 (2003)

Simple analysis of the energy density distribution of the diffracted ultraviolet beam from a fiber Bragg grating phase mask

Dongwook Park and Minyeon Kim
Opt. Lett. 29(16) 1849-1851 (2004)

Chirped pulse amplification with a nonlinearly chirped fiber Bragg grating matched to the Treacy compressor

G. Imeshev, I. Hartl, and M. E. Fermann
Opt. Lett. 29(7) 679-681 (2004)