Octave wide continuum generation in high index planar waveguide by 1.5 µm femtosecond pump

Netti, C.M., Zoorob, M., Roberts, S., Charlton, M., Parker, G.J., Baumberg, J.J. and Lincoln, N.L. (2005) Octave wide continuum generation in high index planar waveguide by 1.5 µm femtosecond pump. In Commercial and Biomedical Applications of Ultrafast Lasers V. vol. 5714, SPIE - The International Society for Optical Engineering. pp. 195-199 . (doi:10.1117/12.589319).

Abstract

Ultra-high bandwidth continuum generation has been attracting enormous interest for applications in optical frequency metrology, low-coherence tomography, laser spectroscopy, dispersion measurements, sensor techniques and others. The acceptance of this new technology would greatly benefit from the availability of compact and user-friendly sources. High index planar devices provide a versatile and unique approach to continuum generation. The dispersion can be carefully engineered by choosing the material and the geometry of the waveguides. Optical integration can also be provided on the same platform. Hundreds of different waveguides having different and calibrated dispersions can be integrated in few tens of millimeters. Input and output of the 2D guides can be tailored to provide mode matching to fibers and pump lasers by means of single element bulk optics. In this paper for the first time we demonstrate a low-noise, ultra-high bandwidth continuum at 1.55 µm. A bandwidth in excess of 390 nm is obtained by launching energy as low as 50 pJ in a 12 mm short tapered planar waveguides. The pump wavelength was in the normal dispersion regime and was provided by a compact, fiber-based sub-100 femtosecond source

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