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Proceedings Paper

Efficient second harmonic generation in femtosecond laser written optical waveguides on periodically poled lithium niobate
Author(s): Roberto Osellame; Nicola Chiodo; Mirko Lobino; Marco Marangoni; Giulio Cerullo; Roberta Ramponi; Henry T. Bookey; Robert R. Thomson; Nicholas Psaila; Ajoy K. Kar
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Paper Abstract

The authors report on the fabrication of buried waveguides in both lithium niobate and periodically poled lithium niobate. First 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. We measured coupling losses of 1.1 dB/facet and propagation losses as low as 0.6 dBcm-1. Optical waveguides have been also inscribed in periodically poled lithium niobate by femtosecond laser pulses with the same multiscan technique. Second harmonic generation experiments from a fundamental wavelength of 1567 nm demonstrate that the nonlinear optical coefficient in the waveguides is preserved, yielding a conversion efficiency of 18% W-1.

Paper Details

Date Published: 15 February 2008
PDF: 9 pages
Proc. SPIE 6881, Commercial and Biomedical Applications of Ultrafast Lasers VIII, 688112 (15 February 2008); doi: 10.1117/12.763115
Show Author Affiliations
Roberto Osellame, IFN-CNR, Politecnico di Milano (Italy)
Nicola Chiodo, IFN-CNR, Politecnico di Milano (Italy)
Mirko Lobino, IFN-CNR, Politecnico di Milano (Italy)
Marco Marangoni, IFN-CNR, Politecnico di Milano (Italy)
Giulio Cerullo, IFN-CNR, Politecnico di Milano (Italy)
Roberta Ramponi, IFN-CNR, Politecnico di Milano (Italy)
Henry T. Bookey, Heriot-Watt Univ. (United Kingdom)
Robert R. Thomson, Heriot-Watt Univ. (United Kingdom)
Nicholas Psaila, Heriot-Watt Univ. (United Kingdom)
Ajoy K. Kar, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 6881:
Commercial and Biomedical Applications of Ultrafast Lasers VIII
Joseph Neev; Stefan Nolte; Alexander Heisterkamp; Christopher B. Schaffer, Editor(s)

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