Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 45: Ultrashort Laser Pulses I
Q 45.8: Vortrag
Donnerstag, 3. März 2016, 12:45–13:00, a310
Analysis and measurement of spatiotemporal couplings in noncollinear optical parametric amplifiers — •Achut Giree1,2, Federico J. Furch1, Mark Mero1, Gunnar Arisholm3, Claus Peter Schulz1, and Marc J.J. Vrakking1 — 1Max Born Institute, Max-Born-Str. 2A, D12489, Berlin, Germany — 2Amplitude Technologies, 2-4 rue du Bois Chaland CE 2926, 91029 Evry, France — 3Norwegian Defence Research Establishment (FFI), PO Box 25, NO-2027 Kjeller, Norway
Noncollinear optical parametric amplifiers (NOPAs) are capable of delivering high energy, high repetition rate few-cycle pulses and are becoming increasingly more attractive in attosecond science. The high repetition rate (>>10 kHz) allows a significant increase in data acquisition speed and therefore is particularly important for electron-ion coincidence detection techniques where the necessary event rates are <<1 per pulse for unambiguous identification of electrons and their ionic partners. However, NOPAs may suffer from unwanted couplings between temporal and spatial coordinates of the electromagnetic field induced by the noncollinear geometry, known as spatiotemporal distortions. This ultimately limits the maximum achievable intensity at focus. In this work, we present a numerical study of spatiotemporal couplings in a NOPA based on the Sisyfos software and discuss possible ways to minimize the distortions. Additionally, we propose a real time technique to measure the spatiotemporal distortions based on spatially resolved spectral interferometry which serves as a tool to reduce them during NOPA alignment.