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8 March 2023 Benchmark evaluation for a single frequency continuous wave OPO seeded pulsed dye amplifier for high-resolution laser spectroscopy
M. Urquiza-González, M. Au, C. Bernerd, M. Bissell, B. van den Borne, K. Chrysalidis, T. E. Cocolios, V. N. Fedosseev, K. T. Flanagan, R. G. Garcia Ruiz, S. Geldhof, R. P. de Groote, Á. Koszorús, D. Hanstorp, M. Heines, R. Heinke, K. Hens, O. S. Khwairakpam, S. Kujanpää, L. Lalanne, B. A. Marsh, G. Neyens, M. Nichols, H. Perrett, D. Pitman-Weymouth, J. Reilly, V. Sonnenschein, K. Wendt, J. Wessolek, S. G. Wilkins, X. F. Yang
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Proceedings Volume 12399, Solid State Lasers XXXII: Technology and Devices; 123990M (2023) https://doi.org/10.1117/12.2646665
Event: SPIE LASE, 2023, San Francisco, California, United States
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Abstract
The study of the atomic spectrum via resonant laser excitation provides access to underlying effects caused by the nuclear structure, which is of special interest in short-lived radioisotopes produced at Isotope Separator On-Line (ISOL) facilities. Current implementations of resonant laser ionization techniques often limit the extraction of the nuclear observables due to the low spectral resolution of the pulsed laser systems deployed. Several high-resolution spectroscopy techniques demand spectral widths in the order of hundreds of MHz and below. A proven solution to reduce this linewidth is the pulsed amplification of a narrow-band continuous wave (cw) laser. This work presents the demonstration of a pulsed dye amplifier seeded by a commercially available cw Optical Parametric Oscillator (OPO). The performance of this system was compared with competing setups using a cw dye laser seed source as well as a frequency mixing technique using a combination of an injection-locked titanium:sapphire (Ti:Sa) and a Nd:YVO4 laser. Spectral bandwidths of the systems were measured using a high finesse Fabry-Perot Interferometer, resulting in comparable optical linewidths between 140 to 156 MHz at a wavelength of 328 nm for the different laser setups. Suitability for on-line experiments was validated by performing high-resolution spectroscopy of radioactive silver isotopes in the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the Isotope Separator On-Line Device (ISOLDE), at the European Organization for Nuclear Research (CERN). The quality of the hyperfine spectra was similar for the dye and the OPO seed and the deduced hyperfine splitting was in good agreement with literature, while the frequency mixing technique exhibited less precise results attributed to the frequency instabilities and mode-hops of the single-mode Nd:YVO4 laser.
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M. Urquiza-González, M. Au, C. Bernerd, M. Bissell, B. van den Borne, K. Chrysalidis, T. E. Cocolios, V. N. Fedosseev, K. T. Flanagan, R. G. Garcia Ruiz, S. Geldhof, R. P. de Groote, Á. Koszorús, D. Hanstorp, M. Heines, R. Heinke, K. Hens, O. S. Khwairakpam, S. Kujanpää, L. Lalanne, B. A. Marsh, G. Neyens, M. Nichols, H. Perrett, D. Pitman-Weymouth, J. Reilly, V. Sonnenschein, K. Wendt, J. Wessolek, S. G. Wilkins, and X. F. Yang "Benchmark evaluation for a single frequency continuous wave OPO seeded pulsed dye amplifier for high-resolution laser spectroscopy", Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices, 123990M (8 March 2023); https://doi.org/10.1117/12.2646665
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KEYWORDS
Optical parametric oscillators
Continuous wave operation
Pulsed laser operation
Dyes
Laser frequency
Dye lasers
Sum frequency generation
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