Light source device

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G - Physics

02

B

88/0.1

G02B 27/42 (2006.01) G02F 1/383 (2006.01)

Patent

CA 2004634

A device for generating a second harmonic from a laser source is disclosed. The light from the laser passes through an optical fiber in which the second harmonic is generated. The light exiting from the optical fiber has a conical wave surface which is incident upon a collimating lens. Because the collimating lens has a diffraction lattice formed thereon, it is easy and efficient to collimate the second harmonic. It is also possible to decrease the size of the apparatus due to the use of the diffraction lattice formed on the collimator lens. This enable such a device to be particulary useful with a small sized light source such as a semiconductor laser.

L'invention est un dispositif de génération de deuxièmes harmoniques au moyen d'un laser. La lumière émise par un laser traverse une fibre optique dans laquelle les deuxièmes harmoniques sont engendrées. La lumière qui sort de la fibre optique a une surface d'onde conique qui est dirigée sur une lentille collimatrice. Celle-ci porte un réseau de diffraction qui rend la collimation des deuxièmes harmoniques facile et efficace. L'utilisation du réseau de diffraction formé sur la lentille collimatrice permet de plus de réduire la taille du dispositif. Celui-ci devient alors particulièrement utile avec une source lumineuse de petites dimensions telle qu'un laser à semi-conducteur.

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