pulseCheck and Mini PD offer the possibility to measure both collinear and non-collinear. It is possible to switch between both modes.
Collinear Autocorrelation
In collinear mode, interference occurs between the two pulse trains. Such an autocorrelation is also called interferometric autocorrelation or fringe-resolved measurement. It is used in particular for very short pulses. The collinear mode provides additional qualitative information about the phase, the chirp and the central wavelength of the pulse.
Non-Collinear Autocorrelation
In non-collinear mode the autocorrelation becomes background-free. This type of measurement is also called intensity autocorrelation. It enables a very high dynamic range to be achieved and weak satellites or echo pulses in the wings of the pulse can be detected.
The pulseCheck in combination with TPA Optics Sets and the Mini TPA offer a “hybrid” of the two modes: the collinear intensity autocorrelation.