Fig. 5: Measurement of the spatial profiles of the output pulses from OPA3.
From: Optical parametric amplification of sub-cycle shortwave infrared pulses
a Beam profile of the short-wavelength (SW) component at the focal point. b Beam profile of the long-wavelength (LW) component at the focal point. The x- and y-directions are defined as parallel and perpendicular to the optical table, respectively, in both figures. The offsets of the positions in the x- and y-directions are common in a, b. c Evolution of the beam radius (half width at e−2 maximum) in the x-direction with the beam propagation across the focal point. Circles and squares denote the radii of the short- and long-wavelength components, respectively. We evaluated the M2 value for each wavelength component by fitting each measured radius. Resultant fitting curves are shown as dotted and dashed curves for the short- and long-wavelength components, respectively. d Evolution of the beam radius (half width at e−2 maximum) in the y-direction. Symbols and traces are defined as in c.
