We show that permanent optical gratings can be photowritten into simple silicate glasses by exposure to interfering beams of an Ar-ion laser after the glass has been treated by x rays. Gratings with index modulations as large as Δn = 10-5 can be formed in less than a minute by exposure to write beams with intensities of the order of 50 W/cm2.
© 1992 Optical Society of America
G. M. Williams, D. A Dutt, J. A. Ruller, and E. J. Friebele, "Permanent photowritten optical gratings in irradiated silicate glasses," Opt. Lett. 17, 532-534 (1992)