Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms

Year: 2021

Authors: Tinsley Jonathan N.; Bandarupally Satvika; Penttinen Jussi-Pekka; Manzoor Shamaila; Ranta Sanna; Salvi Leonardo; Guina Mircea; Poli Nicola

Autors Affiliation: Dipartimento di Fisica e Astronomia and LENS – INFN Sezione di Firenze, Universita degli Studi di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy; Optoelectronics Research Centre, Tampere University, 33720 Tampere, Finland; Vexlum Ltd, Korkeakoulunkatu 3, 33720 Tampere, Finland; Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (INO-CNR), 50019 Sesto Fiorentino, Italy

Abstract: High-power and narrow-linewidth laser light is a vital tool for atomic physics, being used for example in laser cooling and trapping and precision spectroscopy. Here we produce Watt-level laser radiation at 457.75 nm and 460.86 nm of respective relevance for the cooling transitions of cadmium and strontium atoms. This is achieved via the frequency doubling of a kHz-linewidth vertical-external-cavity surface-emitting laser (VECSEL), which is based on a novel gain chip design enabling lasing at > 2 W in the 915-928 nm region. Following an additional doubling stage, spectroscopy of the S-1(0) -> P-1(1) cadmium transition at 228.87 nm is performed on an atomic beam, with all the transitions from all eight natural isotopes observed in a single continuous sweep of more than 4 GHz in the deep ultraviolet. The absolute value of the transition frequency of Cd-114 and the isotope shifts relative to this transition are determined, with values for some of these shifts provided for the first time. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 29 (16)      Pages from: 25462  to: 25476

KeyWords: CONTINUOUS-WAVE; ISOTOPE SHIFT; FREQUENCY; LINE; GENERATION; NM
DOI: 10.1364/OE.429898

Citations: 18
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