The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2001
Filed:
Feb. 02, 1999
Magnus Arvidsson, Sollentuna, SE;
Bjorn Hansson, Vallentuna, SE;
Carsten Lindstrom, Stockholm, SE;
Martin Holmgren, Stockholm, SE;
Spectra Precision AB, Danderyd, SE;
Abstract
A Q-switched laser, which is pumped by at least one pump source (,), providing pulses. The laser comprises two mirrors (,) providing a laser cavity, in which a gain medium (,), a saturable absorber (,) and a controllable active modulator (,) is situated. Loss can be introduced in the modulator (,) by a control device (,). In a first phase, said control device (,) introduces loss in the active modulator, setting a threshold inversion density band to a level (B) high enough to be above the actual inversion density in the gain medium means. In a second phase, the control device lowers said loss instantly, which will lower the threshold inversion density band to a level (A) lower than the actual inversion density in order to activate emission of said Q-switched pulse.