4.
Alignment and Measurement
4.2.6.
Background-Free (Non-Collinear) Autocorrelation
The interaction types collinear and background-free (non-collinear) can be selected by turning
the "BEAM DISTANCE" screw at the optical head to the appropriate position. The beam distance
of the interacting beams from the two interferometer arms can be changed between 0 ... 6 mm
(observable at the alignment window next to the input aperture - the moving spot has to be at
the left side of the x spot). After changing the beam distance also the focusing, the sensitivity,
and the phase-matching angle should be optimized again. For convenience, it is recommended to
proceed in small steps, so that the ACF never disappears entirely. For a comparison between a
collinear and non-collinear ACF refer to Figure 4.5 on page 25.
Pulse
Scout2 Version 1.1
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July 2015
