Feb 20 – 22, 2013
CERN
Europe/Zurich timezone

Spectral linewidth control of broadly tunable high repetition solid state lasers

Feb 21, 2013, 5:10 PM
20m
30-7-018 (CERN)

30-7-018

CERN

European Organisation for Nuclear Research CH - 1211Genève 23 Switzerland

Speaker

Tobias Kron (University of Mainz)

Description

Resonance ionization is the key for the efficient production of highly pure beams produced with laser ion sources at Isotope Separator On-Line (ISOL) facilities. The high element selectivity is achieved by applying a multi-step resonant excitation and ionization scheme via optical transitions unique for every element. To ensure access to a maximum number of elements wide-range tunable laser systems like Ti:sapphire or dye lasers are required. The frequency selection of the Ti:sapphire lasers operated at the leading on-line laser ion source facilities worldwide (i.e. ISOLDE-RILIS at CERN, ISAC-TRILIS at TRIUMF and few others) is based on a combination of a birefringent filter and a thin etalon which limits the spectral line width to typically 6 GHz, which almost perfectly matches the Doppler width of the thermal atom ensemble inside a hot cavity. For applications like direct in-source laser spectroscopy addressing hyperfine structure and isotope shift investigations as well as isomer selection a further considerable reduction of the experimental line width is required. This is achieved by utilization of a second, thick etalon within the laser resonator implying simultaneous control. The resulting laser line width well below 1 GHz expands the applications of this solid state laser system and enhances generation of higher harmonics to access the blue and ultra-violet spectral range. The operation principle, wavelength selection, line width reduction and automated wavelength control of the dual-etalon laser are discussed in this presentation. The actual performance at Mainz as well as at the CERN ISOLDE/RILIS is analyzed and the steps towards a reliably tunable, fully automated narrow band width Ti:sapphire laser are given.

Primary author

Tobias Kron (University of Mainz)

Co-authors

Prof. Klaus Wendt (Johannes Gutenberg-Universitaet Mainz (DE)) Ralf Erik Rossel (Johannes-Gutenberg-Universitaet Mainz (DE)) Sebastian Rothe (Johannes-Gutenberg-Universitaet Mainz (DE)) Volker Sonnenschein (U)

Presentation materials