Microstructured waveguides in z-cut LiNbO3 by high-repetition rate direct femtosecond laser inscription

Mykhaylo Dubov*, Sonia Boscolo, David J. Webb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We 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. Refractive index contrasts as high as −0.0127 have been achieved for individual modification tracks. The results pave the way for developing microstructured WGs with low-loss operation across a wide spectral range, extending into the mid-infrared region up to the end of the transparency range of the host material.
Original languageEnglish
Pages (from-to)1708-1716
Number of pages9
JournalOptical Materials Express
Issue number8
Early online date24 Jul 2014
Publication statusPublished - 1 Aug 2014

Bibliographical note

© OSA 2014

This paper was published in Optical Materials Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=ome-4-8-1708. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Funding: Leverhulme Trust (grant RPG-278) and EPSC (grant EP/J010413/1).


  • waveguide
  • femtosecond inscription
  • lithium niobate
  • microstructured waveguide
  • direct femtosecond laser microfabrication


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