We investigate the role of self-trapped excitons (STEs) and defects in the formation of femtosecond laser pulse induced nanogratings (NGs) in fused silica. Our experiments reveal strongly enhanced NG formation for pulse separations up to the STE lifetime. In addition, the absorption spectra show that the weaker cumulative action of laser pulses for longer temporal separations is predominantly mediated by dangling-bond-type lattice defects that emerge from decaying STEs.
© 2012 Optical Society of America
Optical Design and Fabrication
Original Manuscript: September 22, 2011
Revised Manuscript: December 20, 2011
Manuscript Accepted: December 20, 2011
Published: February 6, 2012
Sören Richter, Fei Jia, Matthias Heinrich, Sven Döring, Ulf Peschel, Andreas Tünnermann, and Stefan Nolte, "The role of self-trapped excitons and defects in the formation of nanogratings in fused silica," Opt. Lett. 37, 482-484 (2012)