Optical amplifier and laser

H - Electricity – 01 – S

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H01S 3/091 (2006.01) H01S 3/094 (2006.01) H01S 3/17 (2006.01)

Patent

CA 2156426

A laser has a resonant cavity defined by a pair of mirros (3, 5) butted to respective ends of a fluorozirconate optical fibre (1). The fibre (1) has a numerical aperture of 0.205 and an LP11 mode cut-off of about 2.0µm. The fibre (1) is co-doped with thulium ions to a concentration of about 0.1%, and with terbium ions to a concentration of about 1 %. An optical pump source (6) provides a pump signal at 775 nm which excites the thulium ions into the 1G4, energy level to provide lasing at about 475 nm. The pump source is preferably a high power semiconductor laser (16).

Un laser comprend une cavité résonante définie par une paire de miroirs (3, 5) venant en butée contre les extrémités respectives d'une fibre optique fluoro-zirconate (1). La fibre (1) possède une ouverture numérique de 0,205 et une coupure de mode LP11 d'environ 2,0mum. La fibre (1) est dopée avec des ions thulium pour obtenir une concentration d'environ 0,1 % et avec des ions terbium pour obtenir une concentration d'environ 1 %. Une source de pompe optique (6) fournit un signal de pompe à 775 nm qui excite les ions thulium pour les faire passer au niveau d'énergie 1G4 en vue de fournir l'effet laser à environ 475 nm. Ladite source est de préférence un laser à semi-conducteur (16) de forte puissance.

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