Self-writing a depressed index waveguide in bulk glass

Summary from only given. We recently observed such a decrease in bulk Nd-doped BK7 glass. Negative index changes allow a new range of waveguide structures to be self-written, and this has not been previously explored. We report here on the first numerical simulations of self-writing a depressed index structure, and present simulations of complicated self-written structures in a bulk geometry. Note that few simulations have been carried out in the bulk geometry as these calculations are computationally intensive.