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 Title: Near-fourier-transform-limited Long-pulse Yag-pumped Dye Laser System Author(s): Herburger, Holger Contributor(s): Merkt, Frédéric; Hollenstein, Urs Subject(s): Instrument/Technique Demonstration Abstract: We demonstrate a laser system providing user-designed laser pulses with durations tunable from 10\,ns to 1\,$\mu$s and pulse energies up to 680\,mJ at a repetition rate of 25\,Hz and at a wavelength of 1064\,nm. This radiation is frequency doubled in an LBO crystal yielding pulses of 532\,nm radiation with pulse energies of 90\,mJ. The frequency-doubled laser is used as a pump source for a dye amplification line seeded by the output of a commercial continuous-wave ring dye laser. This system enables us to generate 10\,ns to 120\,ns long pulses with a Gaussian temporal profile in the visible range of the electromagnetic spectrum with output energies of up to 5\,mJ per pulse. We also generate long pulses of UV radiation (pulse energies up to 500\,$\mu$J, pulse length up to 85\,ns) by frequency doubling in a BBO crystal. \\ \\ The properties of the laser system are illustrated in measurements of the Rydberg spectrum of atomic argon in the 3p$^5$4s$[3/2]_2$ $^3$P$_2$ and 3p$^5$4s$^\prime[1/2]_0$ $^3$P$_0$ metastable states. Metastable argon is generated in a supersonic beam using a dielectric barrier discharge. We have recorded spectra of Rydberg series of Ar below the $^2$P$_{3/2}$ and $^2$P$_{1/2}$ ionization thresholds. We use the long lifetimes of the former series to characterize the bandwith of the laser system and determine the autoionization linewidth and line shapes of the later series for comparison with earlier work.\footnote{V.\,L.\,Sukhorukov, I.\,D.\,Petrov, M.\,Sch\"afer, F.\,Merkt, M.-W.\,Ruf, and H.\,Hotop, {\em J. Phys. B: At. Mol. Opt. Phys.} {\bf 45}, 092001 (2012) and references therein.} Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111315 Date Available in IDEALS: 2021-09-24
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