A laser

H - Electricity – 01 – S

Patent

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Details

H01S 3/139 (2006.01) H01S 3/08 (2006.01)

Patent

CA 2601043

A method of stabilising a laser in order to maintain the laser in SLM operation is disclosed. The resonator cavity of the laser is modulated by a modulation signal applied to a piezo-electric transducer (10) coupled to the output coupler( 2) of the laser. The modulation signal is also multiplied by a signal indicative of the energy of the laser radiation within the resonator cavity. The product of these two signals is then low-pass filtered to provide an error signal which is additionally applied to the piezo-electric transducer (10) so as to further vary the optical length of the resonator cavity.

L'invention porte sur un procédé de stabilisation d'un laser pour le maintenir en mode longitudinal unique (SLM). La cavité résonnante du laser est modulée par un signal de modulation appliqué à un transducteur piézo-électrique (10) relié au coupleur de sortie (2) du laser. Le signal de modulation est par ailleurs multiplié par un signal indicatif de l'énergie du faisceau laser dans la cavité résonnante. On passe ensuite le produit de ces deux signaux dans un filtre passe-bas pour obtenir un signal d'erreur qu'on applique en plus au transducteur piézo-électrique (10) de manière à provoquer une nouvelle variation de la longueur optique de la cavité résonnante.

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