An irrecoverable change in the refractive index of plasma self-channeled silica fibers caused by femtosecond optical pulses

Park, I.-W.; Ju, H.; Avilov, A.; Choh, S. H.; Koh, E. K.; Cho, S. H.; Kumagai, H.; Midorikawa, K.
July 2003
Applied Physics Letters;7/28/2003, Vol. 83 Issue 4, p656
Academic Journal
We have investigated the physical properties of modified optical fibers through which 110 fs Ti:sapphire laser beam is self-focused down to 5 µm at 790 and 395 nm. The optically modified region in the fiber core exhibits the refractive index greater than that in the undamaged region. Electron diffraction measurements for the damaged region reveal that the enhancement of index from 1.457 to 1.480 is induced by the crystallization of amorphous SiO&sub2; into a cristobalite structure. During the optical damaging, silicon and oxygen plasma preferably recombine to result in new bonds responsible for the crystallization. Some of the remnant silicon plasma lead to defects of the well-known E′-center, whose density increased parabolically with the input light intensity.


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