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20 December 2004 Ultrashort-pulse behavior in resonant reflection filters
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Resonant reflection filters -- also known as grating waveguide structures -- are characterised by a multilayer configuration including a substrate, waveguide layer and grating(s) at the top of and, in this investigation, also under the waveguide layer. For a specific wavelength at a specific angular and polarisation orientation an incident beam is partly diffracted, guided and rediffracted, leading to vanishing transmission due to destructive interference with the directly transmitted beam, while most of the light is reflected. Since this resonance is a guided mode phenomenon these devices can be used as tunable filters or dichroic elements (reflected wavelength as a function of incident angle) as long as the guided mode condition holds. In this experimental study the behaviour of ultrashort pulses of ~100 fs within structures with various grating depths and, therefore, different spectral resonance bandwidths was investigated under resonance conditions. Spectral and time-resolved measurements in transmission as well as reflection geometry revealed that the ultrashort pulses leaving the structures are time-bandwidth limited, i.e. the spectral bandwidth of the resonant filter determines the pulse length. Group velocity dispersion (GVD) has no important influence since the light is immediately rediffracted after having been coupled into the waveguide layer of the sample.
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Christoph Kappel, Andre Selle, Mark Andreas Bader, and Gerd Marowsky "Ultrashort-pulse behavior in resonant reflection filters", Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004);

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