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15 April 2003 1.5-micron enhancement in active waveguides fabricated with femtosecond laser pulses
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We report on single mode active waveguides at 1.5 μm in Er:Yb-doped glass substrates fabricated with femtosecond laser pulses. A new spatial beam shaping approach for fabrication of waveguides with circular transverse profile is discussed, which uses an astigmatic beam and controls both beam waist and focal position in tangential and sagittal planes. The experimental results are well described by a simple nonlinear absorption model. The waveguides realized with this technique provide a significant enhancement in the whole Er-band, becoming interesting candidates for the realization of many photonic devices.
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Roberto Osellame, Stefano Taccheo, Giulio Cerullo, Marco Marangoni, Gino Sorbello, Dario Polli, Sandro De Silvestri, Paolo Laporta, and Roberta Ramponi "1.5-micron enhancement in active waveguides fabricated with femtosecond laser pulses", Proc. SPIE 4941, Laser Micromachining for Optoelectronic Device Fabrication, (15 April 2003);

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