Modern Experimental Techniques in Ultrafast Atomic …
269
Fig. 11 Schematic diagram comparing FROG and GRENOUILLE setups. This figure is reprinted
from [46] with permission from The Optical Society (OSA)
by emitting a second-harmonic signal of varying wavelengths for beams incident at
different vertical angles of incidence (therefore, satisfying different phase-matching
conditions). A pair of cylindrical lenses is then used to image the spectrum in a camera. The wavelength is mapped along the vertical direction while the delay between
the pulses is mapped along the horizontal direction, which gives the trace. Figures 13
and 14 show the femtosecond pulse characterization performed for the Ti: sapphire
laser pulses of PRL, Ahmedabad.
4 Femtosecond Pump-Probe Techniques
Time-resolved studies of photo-induced processes in atoms and molecules (gasphase samples) require the pump-probe technique and the electron/ion detection and
momentum mappings techniques such as reaction microscopy or velocity map imaging spectrometry. In this section, we discuss the femtosecond pump-probe technique
only. In the femtosecond pump-probe technique, the laser pulse is split into two - a
269
Fig. 11 Schematic diagram comparing FROG and GRENOUILLE setups. This figure is reprinted
from [46] with permission from The Optical Society (OSA)
by emitting a second-harmonic signal of varying wavelengths for beams incident at
different vertical angles of incidence (therefore, satisfying different phase-matching
conditions). A pair of cylindrical lenses is then used to image the spectrum in a camera. The wavelength is mapped along the vertical direction while the delay between
the pulses is mapped along the horizontal direction, which gives the trace. Figures 13
and 14 show the femtosecond pulse characterization performed for the Ti: sapphire
laser pulses of PRL, Ahmedabad.
4 Femtosecond Pump-Probe Techniques
Time-resolved studies of photo-induced processes in atoms and molecules (gasphase samples) require the pump-probe technique and the electron/ion detection and
momentum mappings techniques such as reaction microscopy or velocity map imaging spectrometry. In this section, we discuss the femtosecond pump-probe technique
only. In the femtosecond pump-probe technique, the laser pulse is split into two - a