The picosecond laser system was based on an Nd:YAG pump laser (1064 nm) with a mode-locked oscillator, a regenerative amplifier, and a single pulse power amplifier, producing a weak pulse train output and a strong single pulse output with a single pulse duration of 30 ps with a repetition rate of 10 Hz. In a second laser unit the weak train beam is amplified and frequency-tripled (355 nm), the strong single pulse beam is frequency-tripled only, while the left-over of the 1064 nm single pulse is the third output beam. In the third laser unit the 355 nm train enters an optical parametric oscillator (OPO) state providing tunable but weak radiation between 420 to 710 nm, that is amplified using the strong 355 nm single pulse in a subsequent optical parametric amplifier (OPA) stage. Subsequent frequency-doubling is used to generate the UV wavelengths between 210 to 355 nm, and additional sum-frequency mixing with the left-over 1064 nm single pulse input for the deep UV wavelengths below 210 nm. In the UV range, 30 ps laser pulses were generated, with a pulse energy of a few hundred µJ at the maximum, and a spectral width of approximately 4 cm−1. The standard deviation of the shot-to-shot fluctuations in the pulse energy is approximately 8%.