We investigate evidence of the formation of nonbridging oxygen hole centers in pure silica photonic crystal fibers from 5 ps 1064 nm pulses. The formation of the defects is attributed to the breaking of stressed silicon–oxygen bonds in the glass matrix through a many-photon process. We compare the photodarkening induced by the 1064 nm pump with photodarkening induced by short wavelength light in a 1064 nm pumped supercontinuum extending to 400 nm. It is shown that the higher peak power at the pump wavelength makes it a more significant cause of photodarkening when compared to the shorter wavelength light generated in the fiber.
© 2013 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: April 11, 2013
Revised Manuscript: June 6, 2013
Manuscript Accepted: June 21, 2013
Published: July 23, 2013
J. M. Stone, W. J. Wadsworth, and J. C. Knight, "1064 nm laser-induced defects in pure SiO2 fibers," Opt. Lett. 38, 2717-2719 (2013)