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Des amplificateurs laser aux amplificateurs paramétriques : études de l'amplification paramétrique optique à dérive de fréquence et du blocage de modes dans les oscillateurs paramétriques optiques

Abstract : Like the well known Ti:Sapphire laser medium, some optical parametric amplifiers (OPA) exhibit gain bandwidths large enough to generate and amplify optical pulses among the shortest (<100fs). This statement is the starting point of this PhD work: to which extent can OPAs be used instead of laser amplifiers whether in chirped-pulse laser chains or in mode-locked oscillators ?
In the first section, the three wave mixing process is studied from a theoretical point of view, the plane wave solutions in a bulk non linear crystal are derived and a geometrical interpretation is given. Periodically poled non linear crystals are also studied as well as quasi-phase matching.
The second section is dedicated to the experimental study of optical parametric chirped-pulse amplification (OPCPA) at 1054nm. Two high gain (>106) preamplifiers, based on bulk BBO and PPLN crystals, are studied and compared. The question of temporal pulse contrast – a key issue for ultra-high intensity laser chains – is extensively studied. The contrast of several OPCPA systems is compared and its various contributions (parametric fluorescence, amplitude noise of the pump pulse) are identified and quantified.
The last section of this work deals with continuous mode-locked optical parametric oscillators (ML-OPO), as well from a theoretical point of view than from an experimental point of view. The first quasi-continuous, actively mode-locked and doubly resonant ML-OPO is demonstrated at 1 micron.
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Submitted on : Thursday, June 19, 2008 - 10:10:33 AM
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  • HAL Id : tel-00288940, version 1

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Nicolas Forget. Des amplificateurs laser aux amplificateurs paramétriques : études de l'amplification paramétrique optique à dérive de fréquence et du blocage de modes dans les oscillateurs paramétriques optiques. Physique Atomique [physics.atom-ph]. Ecole Polytechnique X, 2005. Français. ⟨tel-00288940⟩

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