Spectra Precision Ab

Bjorn Hansson

Martin Holmgren

Carsten Lindstrom

Magnus Arvidsson

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.

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Vallentuna, Sweden

Bjorn Hansson