  Femtosecond laser writing is applied to form Bragg grating waveguides in the
diamond bulk. Type II waveguides are integrated with a single pulse
point-by-point periodic laser modification positioned towards the edge of the
waveguide core. These photonic devices, operating in the telecommunications
band, allow for simultaneous optical waveguiding and narrowband reflection from
a 4th order grating. This fabrication technology opens the way towards advanced
3D photonic networks in diamond for a range of applications.
