Femtosecond laser inscription of low insertion loss waveguides in Z-cut lithium niobate

Henry T. Bookey, Robert R. Thomson, Nicholas D. Psaila, Ajoy K. Kar, Nicola Chiodo, Robert Osellame, Giulio Cerullo

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

A low insertion loss waveguide is fabricated in z-cut lithium niobate using femtosecond laser waveguide inscription. To fabricate a waveguide exhibiting both low propagation and coupling losses, we used the multiscan fabrication technique to control the size of the waveguide cross section. A minimum insertion loss of only 3.5 dB at 1550 nm was measured for the 18-mm-long waveguide when directly coupled to Corning SMF-28 fibers. Of this 3.5 dB, we attribute 2.1 dB to coupling losses, 1.1 dB to propagation losses, and 0.3 dB to Fresnel reflections. © 2007 IEEE.

Original languageEnglish
Pages (from-to)892-894
Number of pages3
JournalIEEE Photonics Technology Letters
Volume19
Issue number12
DOIs
Publication statusPublished - 15 Jun 2007

Keywords

  • Buried optical waveguides
  • Femtosecond laser writing
  • Lithium niobate (LN)
  • Optical device fabrication

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