We present systematic investigations of harmonic generation in Argon, driven in the vicinity of a five-photon resonance by intense, tunable picosecond radiation pulses. When properly matching the laser frequency with the Stark-shifted multi-photon resonance, we observe a pronounced enhancement not only of the 5th, but also the 7th and 9th harmonic of the driving laser (i.e. at orders higher than the involved multi-photon resonance). We study the harmonic yield at different intensities and wavelengths of the driving laser to determine optimal conditions for resonantly-enhanced harmonic generation.
Non-invasive temperature measurements are described as a means for verification of standard invasive temperature sensors in the process industry. The work is motivated by the need for more controlled measurement quality in digitalization of process industries. The concept, relevant measurements and a verification example are presented, with a discussion of the implications.
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