A single mode laser suitable for use in frequency multiplied...

H - Electricity – 01 – S

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H01S 3/098 (2006.01) H01S 3/109 (2006.01) H01S 3/06 (2006.01) H01S 3/08 (2006.01) H01S 3/081 (2006.01)

Patent

CA 2289695

A single mode laser implementation and associated method are disclosed. The laser (10) may accommodate a frequency multiplying material to provide an intracavity doubled single frequency laser. The laser implementation includes an input mirror (20) and an output mirror (22) defining a resonant cavity and a light path within the resonant cavity and between the mirrors. A lasant material (24) is positioned in the light path for lasing at a desired fundamental wavelength and possibly other, unwanted wavelengths. A first birefringent member (26) is also positioned in the light path for refracting in different directions the different wavelengths of light which are present along the path. Also positioned in the light path is a second birefringent (28) member which cooperates with the first birefringent member such that the first and second birefringent members together discriminate between the desired fundamental wavelength and the unwanted wavelengths so that one polarization of the desired fundamental wavelength is refracted in one direction which causes it to lase while certain portions of the unwanted wavelengths are refracted in other directions which cause all polarization of the umwanted wavelengths to be extinguished.

L'invention concerne une configuration de laser monomode et un procédé associé. Le laser (10) peut recevoir un dispositif de multiplication de fréquence qui le transforme en laser à intracavité à doublage de fréquence unique. La configuration de laser comprend un miroir d'entrée (20) et un miroir de sortie (22) définissant une cavité résonnante et un trajet lumineux dans ladite cavité et entre les miroirs. Un matériau à effet laser (24) est placé sur le trajet lumineux pour donner l'effet laser, à la longueur d'onde fondamentale voulue et éventuellement à d'autres longueurs d'onde non voulues. Un premier élément biréfringent (26) est également placé sur le trajet lumineux pour assurer la réfraction dans différentes directions des longueurs d'onde de la lumière sur le trajet. On place aussi dans ledit trajet un second élément biréfringent (28) qui coopère avec le premier élément biréfringent de sorte que ces deux éléments fassent ensemble la distinction entre la longueur d'onde fondamentale voulue et les longueurs d'onde non voulues, de sorte que soit assurée la réfraction d'une polarisation de la longueur d'onde fondamentale voulue dans une direction, ce qui induit un effet laser, alors que la réfraction de certaines parties des longueurs d'onde non voulues est assurée dans d'autres directions, ce qui supprime toute polarisation des longueurs d'onde non voulues.

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