  Recently we have reported on a compact microcontroller-based unit developed
to accurately synchronise excimer laser pulses (Robert Mingesz et al, Fluct.
Noise Lett. 11, 1240007 (2012), DOI: 10.1142/S021947751240007X,
arXiv:1109.2632). We have shown that dithering based on the random jitter noise
plus pseudorandom numbers can be used in the digital control system to
radically reduce the long-term drift of the laser pulse from the trigger and to
improve the accuracy of the synchronisation. In this update paper we present
our new experimental results obtained by the use of the delay controller unit
to tune the timing of a KrF excimer laser as an addition to our previous
numerical simulation results. The hardware was interfaced to the laser using
optical signal paths in order to reduce sensitivity to electromagnetic
interference and the control algorithm tested by simulations were applied in
the experiments. We have found that the system is able to reduce the delay
uncertainty very close to the theoretical limit and performs well in real
applications. The simple, compact and flexible system is universal enough to be
used in various multidisciplinary applications as well.
