Optical feedback stabilized laser tuned by single-sideband modulation.
We report a subkilohertz-linewidth distributed-feedback diode laser that is optical-feedback locked to a highly stable V-shaped cavity with drift rates below 20 Hz/s. This source is continuously tunable over 1 THz around 1590 nm by selecting a cavity mode and using an innovative single-sideband modulation scheme, which allows for frequency shifting over up to 40 GHz with millihertz accuracy. This robust setup achieves high performance without advanced vibration isolation and will be a powerful tool for metrological applications, in particular a redetermination of the Boltzmann constant by molecular spectroscopy.
Laboratoire Interdisciplinaire de Physique, CNRS-Université Joseph Fourier Grenoble (UMR 5588), Saint Martin d'Hères, France.
Johannes
J
Burkart
Daniele
D
Romanini
Samir
S
Kassi