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Caractérisation et modélisation des lasers solides pompés optiquement

Abstract : The aim of this study is to show the importance of transverse effects in the modelling of some laser devices. The first part of this work deals with beam shaping using simple binary diffractive optics. Such optics are able to circularise an elliptic beam emitted by low power laser diodes for example. The reverse transformation is also possible and finds applications in microelectronics. Finally, we will generate annular radialy polarised beam in order to create a longitudinal polarisation in the focal plane of a lens. The second part shows that taking into account the transverse behavior of lasers, we are able to explain the self-Q-Switched behavior of a Cr :LiSAF laser. More over, such a complexity allows us to modelize the bistability area observed in the output characteristic of a heavily doped Er :Yb : phosphate glass lasers. The intacavity diffraction due to gain profile can equally explain the fact that the transverse fundamental mode of a Nd :YVO4 laser can be non-gaussian but annular. The last part studies the passively Q-Switched behaviour of an Er :Yb doped laser. An important amount of measurements has been performed since we had most of the saturable absorbers ever met in the literacy. This database is used to test modelling involving increasing complexity in the field of the transverse effects in such lasers.
Mots-clés : laser optique diffractive
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Submitted on : Wednesday, March 5, 2003 - 10:29:08 AM
Last modification on : Friday, October 23, 2020 - 4:37:12 PM
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  • HAL Id : tel-00002510, version 1

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Michael Fromager. Caractérisation et modélisation des lasers solides pompés optiquement. Physique Atomique [physics.atom-ph]. Université de Caen, 2002. Français. ⟨tel-00002510⟩

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