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Proceedings Paper

Femtosecond laser writing of symmetrical optical waveguides by astigmatically shaped beams
Author(s): Roberto Osellame; Giulio Cerullo; Stefano Taccheo; Marco Marangoni; Dario Polli; Paolo Laporta; Roberta Ramponi
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Paper Abstract

In this paper we describe a novel approach to the fabrication of optical waveguides by focused low-repetition-rate femtosecond laser pulses. This approach overcomes the main limitation of the technique, i.e. the strong asymmetry of the waveguide profile. By using an astigmatic beam and suitably controlling both beam waist and focal position in tangential and sagittal planes, it is possible to shape the focal volume in such a way as to obtain waveguides with a circular transverse profile and of the desired size. This technique is applied to the fabrication of active waveguides in Er:Yb-doped glass substrates. The waveguides are single-mode at 1.5 mm, exhibit propagation losses of about 0.25 dB/cm and an internal gain of 1.4 dB at 1534 nm.

Paper Details

Date Published: 18 August 2004
PDF: 9 pages
Proc. SPIE 5451, Integrated Optics and Photonic Integrated Circuits, (18 August 2004);
Show Author Affiliations
Roberto Osellame, Istituto di Fotonica e Nanotecnologie/CNR (Italy)
Giulio Cerullo, INFM (Italy)
Politecnico di Milano (Italy)
Stefano Taccheo, INFM (Italy)
Politecnico di Milano (Italy)
Marco Marangoni, INFM (Italy)
Politecnico di Milano (Italy)
Dario Polli, INFM (Italy)
Politecnico di Milano (Italy)
Paolo Laporta, INFM (Italy)
Politecnico di Milano (Italy)
Roberta Ramponi, INFM (Italy)
Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 5451:
Integrated Optics and Photonic Integrated Circuits
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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