A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules

A narrow-linewidth, dual-wavelength laser system is vital for the creation of ultracold ground state molecules via stimulated Raman adiabatic passage (STIRAP) from a weakly bound Feshbach state. Here we describe how a relatively simple apparatus consisting of a single fixed-length optical cavity can...

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Bibliographic Details
Published in:arXiv.org 2015-03
Main Authors: Gregory, P D, Molony, P K, Köppinger, M P, Kumar, A, Z Ji, B Lu, Marchant, A L, Cornish, S L
Format: Article
Language:English
Subjects:
Ground state
Lasers
Modulators
Molecular spectroscopy
Online Access:Get full text
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Summary:A narrow-linewidth, dual-wavelength laser system is vital for the creation of ultracold ground state molecules via stimulated Raman adiabatic passage (STIRAP) from a weakly bound Feshbach state. Here we describe how a relatively simple apparatus consisting of a single fixed-length optical cavity can be used to narrow the linewidth of the two different wavelength lasers required for STIRAP simultaneously. The frequency of each of these lasers is referenced to the cavity and is continuously tunable away from the cavity modes through the use of non-resonant electrooptic modulators. Self-heterodyne measurements suggest the laser linewidths are reduced to several hundred Hz. In the context of 87Rb133Cs molecules produced via magnetoassociation on a Feshbach resonance, we demonstrate the performance of the laser system through one- and two-photon molecular spectroscopy. Finally, we demonstrate transfer of the molecules to the rovibrational ground state using STIRAP.
ISSN:2331-8422
DOI:10.48550/arxiv.1411.7951