Lepert, G., Trupke, M., Hinds, E. A., Rogers, H., Gates, J. C., & Smith, P. G. R. (2011). Demonstration of UV-written wavequides, Bragg gratings and cavities at 780 nm, and an original experimental measurement of group delay. Optics Express, 19(25), 24933. https://doi.org/10.1364/oe.19.024933