Passively q-switched picosecond microlaser

H - Electricity – 01 – S

Patent

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Details

H01S 3/113 (2006.01) G01N 21/63 (2006.01) H01S 3/06 (2006.01) H01S 3/0941 (2006.01) H01S 3/109 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2182368

An apparatus and method for a passively Q-switched microlaser (10) for producing high-peak-power pulses of light of extremely short duration are disclosed. The apparatus comprises a gain medium (12) and saturable absorber (14) disposed within a laser cavity (16, 18). When the cavity (16, 18) is pumped, the saturable absorber (14) prevents the onset of lasing until the inversion density within the cavity (16, 18) reaches a critical value. The length of the cavity (16, 18), the material parameters, and the reflectivities of the mirrors (16, 18) are selected such that pulses of duration less than about 1 ns and of peak power in excess of about 10 kW are obtained. The invention has application in high-precision optical radar, nonlinear optics, micromachining, microsurgery, robotic vision, and other technologies requiring high-peak-power laser pulses of extremely short duration.

Microlaser (10) à commutation Q passive produisant des impulsions lumineuses extrêmement courtes à pic de puissance très élevé, et procédé associé. L'appareil comporte un milieu actif (12) et un absorbeur saturable (14) placés dans la cavité laser (16, 18). Lorsque ladite cavité (16, 18) est pompée, l'absorbeur saturable (14) bloque le démarrage de l'effet laser, jusqu'à ce que la densité d'inversion dans la cavité (16, 18) atteigne une valeur critique. La longueur de la cavité (16, 18), les caractéristiques des matériaux et le pouvoir réfléchissant des miroirs (16, 18) sont choisis de manière à obtenir des impulsions inférieures à 1 ns et d'une puissance de pointe supérieure à 10 kW. L'invention a des applications dans les domaines des radars optiques de haute précision, de l'optique non linéaire, du micro-usinage, de la microchirurgie, de la perception visuelle en robotique et dans d'autres techniques requérant des impulsions laser ultracourtes à très fort pic de puissance.

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