13 April 2005 Low-noise self-phase modulation continuum generation in high index tapered planar waveguide at 1040 nm
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Continuum Generation (CG) in optical waveguides has been recently attracting widespread interest in fields requiring large spectral bandwidth such as metrology and Optical Coherence Tomography (OCT). Real time and in-vivo tissue imaging with cell resolution (Δz<1μm) is rapidly becoming the ultimate frontier of several OCT medical applications. CG wavelength and bandwidth are the pertinent criteria to obtain ultra high imaging resolution. The axial resolution in tissues is inversely proportional to the bandwidth whereas the central wavelength is chosen according to the minimum absorption of water and hemoglobin. Therefore optimal candidates for OCT low coherence sources1 are continua around 1μm as this is the zero group velocity dispersion wavelength of water. In this work we demonstrate for the first time a low-noise continuum at very low powers in high index planar waveguides pumped at 1.04 μm. Bandwidths in excess of 150 nm at -3dB are generated with launching energies <1nJ/pulse in a ~2μm2 single mode ridge waveguides pumped in the normal dispersion regime. Self-Phase Modulation (SPM) had proven to be the only nonlinear process responsible for the CG. The polarization of the generated continua is highly preserved. Great flexibility in engineering waveguide dispersion, mode matching and optical functionality on chip is demonstrated by the planar approach.
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Caterina M. Netti, Caterina M. Netti, Majd E. Zoorob, Majd E. Zoorob, Stephen Roberts, Stephen Roberts, Martin Charlton, Martin Charlton, Greg J. Parker, Greg J. Parker, Jeremy J. Baumberg, Jeremy J. Baumberg, John R. Lincoln, John R. Lincoln, Max Lederer, Max Lederer, Daniel Kopf, Daniel Kopf, "Low-noise self-phase modulation continuum generation in high index tapered planar waveguide at 1040 nm", Proc. SPIE 5690, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine IX, (13 April 2005); doi: 10.1117/12.589240; https://doi.org/10.1117/12.589240

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