Lasers à fibre femtoseconde utilisant une paire de réseaux de Bragg à pas variable
|Advisor:||Piché, Michel; Olivier, Michel|
|Abstract:||In this master’s thesis, we present a new type of femtosecond fiber ring laser that uses a pair of chirped fiber Bragg gratings with opposite dispersion. The presence of such elements in a ring cavity reveals a new mode locking regime where a femtosecond pulse evolving in one section of the cavity is locally transformed into a highly chirped picosecond pulse that propagates in the remaining part of the cavity. The section in which the highly chirped pulse propagates acts essentially as an all-fiber linear dispersive delay line. This portion can thus be modified in order to change the net cavity dispersion or the repetition rate of the laser without significantly increasing the nonlinear effects in the cavity. This erbium-doped fiber laser that generates sub-100 fs pulses in any dispersion regime can potentially produce highenergy ultrashort pulses (> 20 nJ; < 50 fs). This source appears to be a practical all-fiber alternative to femtosecond solid-state lasers.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||23 April 2018|
|Collection:||Thèses et mémoires|
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