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Femtosecond Laser Inscription of Low Insertion Loss Waveguides in $Z$-Cut Lithium Niobate

2007; Institute of Electrical and Electronics Engineers; Volume: 19; Issue: 12 Linguagem: Inglês

10.1109/lpt.2007.897534

1941-0174

Henry T. Bookey, Robert R. Thomson, N. D. Psaila, A. K. Kar, N. Chiodo, Roberto Osellame, Giulio Cerullo,

Photonic and Optical Devices

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 3.5dB, we attribute 2.1 dB to coupling losses, 1.1 dB to propagation losses, and 0.3 dB to Fresnel reflections