Laser for providing pulsed light and reflectometric...

H - Electricity – 01 – S

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H01S 3/102 (2006.01) H01S 5/026 (2006.01)

Patent

CA 2656334

A laser for generating laser light pulses comprises a cavity containing an active optical gain medium (102) and a spectral filtering device (104), a delay device (110) for delaying light by a predetermined delay time (.DELTA.t), means (106) for extracting a portion of laser light from the cavity, launching said portion into said delay means (110) and returning the delayed portion to the optical gain medium (102), control means (116) operable to activate the gain medium for a first time period (Cl) to produce a first laser light pulse (LPl) having a duration that is less than the delay time (.DELTA.t), and activate the gain medium for a second time period (C2) while a said delayed portion of the first light pulse that has been delayed by the delay means (UO) is traversing the gain medium (102), thereby to produce a second laser pulse (LP2) having a shorter duration and faster risetime than the first laser light pulse (LPl), and output means (108) for .sigma.utputting the second laser light pulse (LP2).

L'invention concerne un laser destiné à générer des impulsions de lumière laser qui comprend une cavité contenant un milieu de gain optique actif (102) et un dispositif de filtrage spectral (104), un dispositif de retard (110) pour retarder la lumière d'un retard prédéterminé (.DELTA.t), des moyens (106) d'extraction d'une partie de lumière laser à partir de la cavité, le lancement de ladite partie dans ledit moyen de retard (110) et le renvoi de la partie retardée au milieu de gain optique (102), des moyens de commande (116) conçus pour activer le milieu de gain pendant une première période temporelle (C1) afin de produire une première impulsion de lumière laser (LP1) d'une durée inférieure à celle du retard (.DELTA.t), et d'activer le milieu de gain pendant une seconde période temporelle (C2), tandis qu'une partie retardée de la première impulsion de lumière retardée par le moyen de retard (UO) traverse le milieu de gain (102), produisant ainsi une seconde impulsion laser (LP2) dont la durée est plus courte et le temps de montée plus rapide que ceux de la première impulsion de lumière (LP1), et des moyens de sortie (108) qui produisent la seconde impulsion de lumière laser (LP2).

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