Q-switched laser

H - Electricity – 01 – S

Patent

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Details

H01S 3/107 (2006.01) H01S 3/115 (2006.01)

Patent

CA 2632393

A system for producing a laser light pulse is disclosed. The system includes a travelling wave or ring laser incorporating a gain medium with polarizing means for introducing substantially polarized radiation having a first polarization state into the travelling wave laser and output coupling means to substantially output couple radiation having an output polarization state from the travelling wave laser. The system further includes polarization changing means incorporated into the optical path of the travelling wave laser for changing the polarization of radiation having the first polarization state to a seeding polarization state, wherein radiation with the seeding polarization state seeds the gain medium, and radiation intensity modulation means for modulating the intensity of radiation in the travelling wave laser to vary the feedback of radiation into the gain medium, wherein the radiation intensity modulation .means also modulates the radiation with respect to the output coupling means.

Système permettant de générer une impulsion de lumière laser. Le système comprend un laser à onde progressive ou en anneau incorporant un milieu à gain comportant des moyens de polarisation servant à introduire dans le laser à onde progressive un rayonnement sensiblement polarisé présentant un premier état de polarisation et des moyens de couplage de sortie servant à coupler sensiblement en sortie du laser à onde progressive un rayonnement présentant un état de polarisation de sortie. Le système comprend en outre des moyens de changement de polarisation incorporés dans le trajet optique du laser à onde progressive, servant à changer la polarisation du rayonnement présentent le premier état de polarisation en un état de polarisation d~ensemencement, le rayonnement présentant l~état de polarisation d~ensemencement ensemençant le milieu à gain ; et des moyens de modulation d~intensité de rayonnement servant à moduler l~intensité de rayonnement dans le laser à onde progressive afin de faire varier le rayonnement réintroduit dans le milieu à gain, les moyens de modulation d~intensité de rayonnement modulant également le rayonnement émanant des moyens de couplage de sortie.

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