optics logo

Generation and Characterisation of Few-cycle visible-IR, and Attosecond XUV and VUV laser pulses for Attosecond-pump--Attosecond-probe Spectroscopy

Tuesday January 14, 15:00

Organisation: MPL / Russell Division

Speaker: Dr. Tobias Witting (Quantum Optics & Laser Science Group, Physics Department, Blackett Laboratory, Imperial College London)

Place: Large seminar room / MPL


I will report about efforts in attosecond light source development in the attosecond lab at Imperial College. This involves the generation of kHz rep-rate, milli-Joule level CEP stable few-cycle pulses in the vis-IR and also (mid-)IR spectral ranges. These pulses are used to generate XUV and VUV attosecond pulses via high harmonic generation (HHG) in noble gasses. We also explore novel HHG media such as underdense plasma plumes. In this talk I would like to put some emphasis on metrology with a special focus on interferometric methods. I will present the use of novel methods for the characterisation of few-cycle femtosecond pulses in the visible/IR, and mid-IR spectral range. I will briefly explain the 'classic' SPIDER and the more recent developments enabling the single shot characterisation of complex (=pathological) pulses with SEA-CAR-SPIDER. For the spatio-temporal characterisation of few-cycle pulses I show SEA-F-SPIDER measurements of sub-2-cycle pulses from hollow-fibre compressors in the vis-IR and IR. For the characterisation of (attosecond) XUV pulses we have successfully used interferometric tools to access the spectrally resolved spatial phase of HHG. These measurements are important to understand space-time coupling of attosecond pulses. Further I show some results of attosecond streaking measurements in the XUV and VUV spectral range.