Abstract
A 40-nm broad pulse centred at 320nm is produced from an amplified Yb-doped fiber laser operated at 50kHz, and used in a BOXCARS geometry setup for 2DES, with shot-to-shot monitoring of the relative optical phase stability.
Highlights
Two pulse pairs are produced in two interferometers and overlapped again in the BOXCARS geometry (see Fig. 2), where the UV pulse duration is characterized by a transient grating - FROG measurement
Achromatic Sum-Frequency Generation (ASFG) is achieved by engineering the required angular dispersion of the red-NIR pulse in order to fulfil the phase matching condition for SFG in BBO of all its spectral components with the 515-nm, nearly monochromatic (300-fs long, Fourier Limited - FL) second harmonic of the fundamental pulse. More precisely this angular dispersion is computed to be 3.38*10-4 rad/nm, to ensure relative internal angles with the crystal axis ranging from 67.5° to 73.9° for wavelengths spanning from 700 to 1030 nm, respectively
The red-NIR pulse is dispersed at the apex of a 60° SF10 prism, magnified by a 1/8 telescope and overlapped with the 515-nm pulse coming at an internal angle of 44.6° with respect to the crystal axis
Summary
Two pulse pairs are produced in two interferometers and overlapped again in the BOXCARS geometry (see Fig. 2), where the UV pulse duration is characterized by a transient grating - FROG measurement. We adapt the Achromatic Sum-Frequency Generation (ASFG) scheme proposed by Nabekawa et al [7] to convert a large fraction of this Red-NIR spectrum into the 300-345 nm spectral
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