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23 September 2015 Positioning of Littrow mounted gratings in pulse compressors
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The development of chirped pulse amplification lasers toward multi-PetaWatt power imposes more demands on laser system elements. To make the spectral band of pulse compressors wider, laser designers began to consider Littrow mounted grating setups. In this study we investigate two Littrow type configurations. The first one is roll - a grating is rotated in the grating plane by a small angle. The second configuration is pitch - a grating is rotated by small angle about an axis perpendicular to the grating grooves. In this paper we experimentally measured diffraction efficiency of rolled and pitched dielectric grating, and simulated it with two methods: numerical Fourier Modal Method in LightTrans Virtual Lab and semi-analytical Volume Integral Equation Method. Here we claim that roll is more preferable for dielectric diffraction gratings with high groove density. It is shown that the energy of laser pulse compressed by a Littrow-roll configured compressor is 2 to 5% higher than Littrow-pitch configured one.
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Galina Kalinchenko, Stepan Vyhlidka, Daniel Kramer, Alexander Lerer, and Bedrich Rus "Positioning of Littrow mounted gratings in pulse compressors", Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96261R (23 September 2015);

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