Façonnage du contenu spectral d'un OPO doublement résonant par maîtrise de la phase relative, applications pour la spectroscopie

Abstract : There has currently been a growing interest for gas sensing and quantification, in terms of atmospheric pollutants characterization, as well as indoor air quality control or even security concerns in the industrial domain. To meet this challenge, we have developed and characterized a compact nanosecond optical source, which relies on an innovative doubly resonant optical parametric oscillator (DROPO) set-up. The understanding of the role of the relative phase between the three interacting waves has been essential to master the spectral emission of this kind of parametric sources. Accomplishing this work has led us to the control of this phase and to the development of a new architecture, called nested-cavity OPO (NesCOPO). With this new concept, an achromatic control of the relative phase is achieved all over the parametric gain bandwidth, allowing the first demonstration of parametric-gain-shaping. We can thereby highlight two different kinds of functioning depending on whether the parametric gain bandwidth has a unique lobe or two lobes separated by a distance of about one terahertz. In the first configuration, a controlled single mode emission has been obtained whereas a two-frequency emission has been demonstrated in the second mode of operation. This new NesCOPO architecture paves the way to new frequency tuning methods, highly promising for spectroscopic experiments. Taking advantage of the nested-cavities arrangement, we have been able to tune the frequency all over the parametric gain bandwidth with an adjustable resolution. Another tuning technique, opening the perspective for a terahertz frequency scan range, has led to an evolution of the NesCOPO architecture and has been patented. Taking advantage the low oscillation threshold (1 µJ), we have pumped the Nescopo with a microlaser. Then, in order to validate its potential for spectroscopic applications we have implemented the optical source into compact remote and local (photoacoustique technique) gas sensing devices.
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Submitted on : Tuesday, May 29, 2012 - 10:04:23 PM
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Bertrand Hardy-Baranski. Façonnage du contenu spectral d'un OPO doublement résonant par maîtrise de la phase relative, applications pour la spectroscopie. Optique [physics.optics]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00702290⟩

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