Refractive-index changes in fused silica produced by heavy-ion implantation followed by photobleaching.
The changes in refractive index, optical absorption, and volume of synthetic fused silica resulting from the implantation of germanium and silicon ions at energies of 3 and 5 MeV are reported. Implantation changes the density and generates ultraviolet color centers in the silica, which increases the refractive index at visible wavelengths by ~1%. Irradiation of the implanted samples with 249-nm light from a KrF excimer laser photobleaches the color centers and reduces the index by more than 0.1%. Photobleaching is used to write a 4.3-microm pitch diffraction grating in the implanted silica.
Albert
J
J
Malo
B
B
Hill
K O
KO
Johnson
D C
DC
Brebner
J L
JL
Leonelli
R
R