The authors report on the operational parameters that are required to
fabricate buried, microstructured waveguides in a z-cut lithium niobate
crystal by the method of direct femtosecond laser inscription using a highrepetition-
rate, chirped-pulse oscillator system. This image shows a microscope overhead view of an example fabricated microstructured WG with two rings of tracks. For details, see M. Dubov et al. Opt. Mater. Express 5,1708-1716 (2014).