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Q: Fachverband Quantenoptik und Photonik

Q 14: Ultrakurze Pulse: Erzeugung II

Q 14.1: Vortrag

Montag, 2. März 2009, 16:30–16:45, VMP 8 R206

Large bandwidth highly efficient dielectric gratings through high index materials — •Helmut Rathgen — 3. Physikalisches Institut, Uni Stuttgart

Possible dielectric optical grating designs for a chirped pulse amplification scheme are investigated through numerical simulations, with focus on large spectral bandwidth. Grating geometries are considered (i) in transmission, (ii) buried grating between two glass bodies, (iii) TIR grating geometry. The effect of a high refractive index grating layer (n=2--4) is studied. An increase of the spectral bandwidth is observed. The -0.5dB bandwidth around the design wavelength is shown to increase by 1.5--3x (as compared to a fused silica grating). The short wavelength efficiency is found to exceed -3dB. Grating designs that provide a flat -1dB bandwidth over one octave are suggested.