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Acousto-optic frequency combs

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Vicente Duran-Bosch, Léo Djevarhidjian, Côme Schnébelin, Nithyanadan Kanagaraj, Hugues Guillet de Chatellus.
Collaboration : Guillaume Méjean, Samir Kassi, Daniele Romanini


As part of the ANR FROST project, we demonstrated a new dual-comb interferometry technique, using a new concept of acousto-optical frequency comb. These combs include a large number of teeth (> 3000), with an easily adjustable spacing (from 0 to 200 MHz). This project is part of recent developments at LIPHy on Frequency Shifted Feedback (FSF) laser systems. We have for the first time to demonstrate a multi-heterodyne detection technique, based on two acousto-optical frequency combs. Each of the combs is generated using a CW injection laser, and a loop containing an acousto-optical frequency shifter (AOFS) and an amplifier (EDFA) to compensate for losses of the cavity.

The combs have several thousand lines, with almost constant intensity - a two-fold improvement in electro-optical frequency combs. We applied this concept to the spectroscopy of the HCN molecule. Since the loops are independent, the combs produced are not mutually coherent (especially for the most distant lines), which requires a system of servocontrolling the two loops together by PID loop.

References :

  • V. Duran Bosch, C. Schnébelin, and H. Guillet de Chatellus, Coherent multi-heterodyne spectroscopy using acousto-optic frequency combs, Opt. Express, accepted (2018).
  • V. Duran-Bosch, C. Schnébelin, and H. Guillet de Chatellus, Acousto-optic frequency combs for heterodyne interferometry, URSI GASS Montréal (2017).
  • V. Duran-Bosch, C. Schnébelin, and H. Guillet de Chatellus, Heterodyne interferometry using acousto-optic optical frequency combs, CLEO Europe Munich (2017).