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Guetegeschalteter Laser

Q-switched laser comprises a pump light source, an optical resonator, in which a laser medium is situated, and a passive Q-switch, where the part of the light that is decoupled from the optical resonator is fed to an optical delay line
 
: Tünnermann, A.; Nodop, D.; Steinmetz, A.; Limpert, J.

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DE 102009042003 A: 20090921
DE 102009042003 A: 20090921
H01S0003
German
Patent, Electronic Publication
Fraunhofer IOF ()

Abstract
(A1) Die Erfindung betrifft einen guetegeschalteten Laser mit einer Pumplichtquelle (1), einem optischen Resonator, in dem sich ein Lasermedium (6) befindet, und einem passiven Gueteschalter (5). Aufgabe der Erfindung ist es, einen verbesserten guetegeschalteten Laser bereitzustellen, der einfach und kompakt aufgebaut ist und gleichzeitig einen moeglichst geringen zeitlichen Jitter der Repetitionsrate aufweist. Hierzu schlaegt die Erfindung vor, dass mittels eines Strahlteilers (8) ein Teil des aus dem optischen Resonator ausgekoppelten Lichtes einer optischen Verzoegerungsstrecke (9) zugefuehrt wird und nach Durchlaufen der optischen Verzoegerungsstrecke (9) in den optischen Resonator zurueckgekoppelt wird.

 

WO 2011032711 A1 UPAB: 20110405 NOVELTY - The Q-switched laser comprises a pump light source (1), an optical resonator, in which a laser medium is situated, and a passive Q-switch (5). The part of the light that is decoupled from the optical resonator is fed to an optical delay line (9) by a beam splitter (8) and is re-coupled to the optical resonator once it has passed through the optical delay line. The delay line is designed so that the temporal delay, with which the light is re-coupled to the resonator is smaller than the reciprocal value of the repetition rate. DETAILED DESCRIPTION - The Q-switched laser comprises a pump light source (1), an optical resonator, in which a laser medium is situated, and a passive Q-switch (5). The part of the light that is decoupled from the optical resonator is fed to an optical delay line (9) by a beam splitter (8) and is re-coupled to the optical resonator once it has passed through the optical delay line. The delay line is designed so that the temporal delay, with which the light is re-coupled to the resonator is smaller than the reciprocal value of the repetition rate or smaller than integral multiple of the reciprocal value of the repetition rate of the laser. The delay line is reflected. The beam splitter is a polarization beam splitter, a dielectric mirror or a fiber optical beam splitter. The delay line comprises a light-conducting fiber, which has a reflecting fiber-Bragg-lattice at end side. The light-conducting fiber comprises two or more fiber-Bragg-lattice along its longitudinal extent. The delay line comprises a multipass cell with two or more mirrors. A pumping power of the pump light source is adjustable. The delay line is adjustable. The part of the light guided by the beam splitter of the delay line passes a frequency converter against the re-coupling into the optical resonator. The Q-switch is a saturable absorber. The optical amplifier is arranged downstream of the resonator. USE - Q-switched laser useful for a distance measurement, a material processing, a non linear frequency conversion or a time-resolved spectroscopy (claimed). ADVANTAGE - The Q-switched laser has a simple, compact construction with a repetition rate that has at the same time the smallest possible degree of time jitter.

: http://publica.fraunhofer.de/documents/N-159131.html