Fig. 6
From: High power, dual SWIR-MIR OPCPA source for high-order harmonics generation
(a) Near-field, and (b) far-field beam profiles for the 2.1 µm SWIR pulses. The beams were measured using a Silicon CMOS camera (Basler Ace acA4024-29um). The far-field beam profile, measured at the focus of an f = 20 cm CaF\(\phantom{0}_{2}\) lens, is nearly circular with \(\sim\)10\(\%\) ellipticity. Both the near-field and far-field beam profiles were acquired in two-photon mode; the actual intensity distribution was retrieved by taking the square root of the recorded images.
