Published April 8, 2020 | Version v1
Journal article Open

Double-heterodyne probing for ultra-stable laser based on spectral hole burning in a rare-earth doped crystal

  • 1. Univ. Grenoble Alpes, CNRS, Grenoble INP and Institut Néel, 38000 Grenoble, France
  • 2. LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Paris, France
  • 3. Chimie ParisTech, Université PSL, CNRS, Institut de Recherche de Chimie Paris, 75005 Paris, France


We present an experimental technique for realizing a specific absorption spectral pattern in a rare-earth-doped crystal at cryogenic temperatures. This pattern is subsequently probed on two spectral channels simultaneously, thereby producing an error signal allowing frequency locking of a laser on the said spectral pattern. Appropriate combination of the two channels leads to a substantial reduction of the detection noise, paving the way to realizing an ultra-stable laser for which the detection noise can be made arbitrarily low when using multiple channels. We use such technique to realize a laser with a frequency instability of 1.7 × 10−15 at 1 second, not limited by the detection noise but by environmental perturbation of the crystal. This is comparable with the lowest instability demonstrated at 1 second to date for rare-earth doped crystal stabilized lasers.



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NanOQTech – Nanoscale Systems for Optical Quantum Technologies 712721
European Commission