Melkonian, Jean-Michel (2007) Study and realization of high conversion effciency optical parametric oscillators. PhD thesis ONERA, ONERA, EP/X p.225.
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Alternative Locations: http://www.imprimerie.polytechnique.fr/Theses/Files/Melkonian.pdf
Abstract
Bec!
ause they use a resonant process, lasers are often hindered by!
the sma
ll number of available wavelengths and their narrow tunability. Fortunately, nonlinear optics allows to go beyond these limitations by doing frequency conversion in a non resonant way. It is now used in optical parametric oscillators (OPOs) to cover the whole optical spectrum with a wide tunability. However, OPOs display unique properties : three coupled waves with different frequencies and group velocities, a power and phase dependent amplification, and no energy storage. In this work we show that these properties lead to new designs of nonlinear optical sources. We begin with an OPO with increased efficiency, implementing two KTA crystals pumped at 1,064 μm in the nanosecond regime. We then study the possibility of generating short pulses directly in a cw-pumped OPO. We show for the first time that active modelocking in an OPO is possible in the steady-state regime. We then propose to implement passive modelocking by a saturabler absorber in an cw-pumped OPO w!
here there is a strong group velocity mismatch between the signal and the pump. Finally, we adress optical sources including a laser medium and a nonlinear crystal. We build a nonlinear mirror using a PPLN crystal and insert it in a Cr:ZnSe laser to produce picosecond pulses by passive modelocking. We also discuss the possibility of including an OPO inside a cw laser, to produce short tunable pulses in the mid-infrared.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| PhD Supervisor: | Georges, Patrick |
| Date: | 18 December 2007 |
| Board of examiners: | Fabre, Claude and Freysz, Eric and Joffre, Manuel and Bretenaker, Fabien and Godard, Antoine and Moncorgé, Richard and Rosencher, Emmanuel |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | ONERA |
| Collection (Fonds): | Ecole Polytechnique (EP/X) |
| Institution: | EP/X |
| Department: | ONERA |
| Subjects: | 3. Physics, Optics |
| Uncontrolled Keywords: | Laser, Optical parametric oscillator, Infrared, Nanosecond, Picosecond, Modelocking, Nonlinear mirror, intracavity OPO, LiNbO3, Ppln, Kta, GaAs, Cr:ZnSe, Laser, Oscillateur paramétrique optique, Infrarouge, Nanoseconde, Picoseconde, Verrouillage de modes, Miroir non-linéaire, OPO intracavité, LiNbO3, Ppln, Kta, GaAs, Cr:ZnSe |
| ID Code: | 3497 |
| Deposited By: | Laurence Vidament |
| Deposited On: | 06 March 2008 |
Table of content
Introduction
1 Propriétés spécifiques des processus non-linéaires
2 Amplification paramétrique intracavité pour lamélioration du rendement
dun oscillateur paramétrique optique
3 Verrouillage en phase des modes dun oscillateur paramétrique optique
4 Miroir non-linéaire pour la production dimpulsions courtes dans un laser
infrarouge
Conclusion
A Différentes écritures des équations non-linéaires
B Définitions de la bande passante damplification paramétrique
C Détails des calculs du chapitre 2
D Détails des calculs du chapitre 3
E Oscillateur paramétrique optique continu pompé dans le vert et émettant
dans le rouge (article)
Bibliographie
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