Role of the longitudinal piston error in a tiled-grating compressor in second and high-order harmonic generation |
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Authors: | C Hernández-García C Méndez I Arias J R Vázquez de Aldana O Varela I J Sola L Roso |
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Institution: | 1. Grupo de Investigación en óptica Extrema, Universidad de Salamanca, E-37008, Salamanca, Spain 2. Centro de Láseres Pulsados, CLPU, E-37008, Salamanca, Spain 3. Grupo de Investigación en Microprocesado de Materiales con Láser, Universidad de Salamanca, E-37008, Salamanca, Spain
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Abstract: | In this work, we study the limitations for overcoming the longitudinal piston error in a femtosecond tiled-grating compressor using nonlinear measurements like second harmonic generation. In particular, we observe the influence of this error when developing high-power laser experiments such as high-order harmonic generation. The generation of nonlinear processes with femtosecond pulses compressed in tiled-grating systems is studied. Special attention is paid to the role of the longitudinal piston error which is the most difficult to overcome in the compressor alignment. A complex spatio-temporal structure is expected to appear due to that misalignment. Both second harmonic generation in nonlinear crystals and high-order harmonic generation in gases are studied and a strong dependence with piston error is found, thus leading to a sub-micron modulation in the generated signal. In particular, the high sensitivity of the high-order harmonics to the longitudinal position allows one to use this processes for the accurate alignment of the compressor to few tens of nanometers. |
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