Cobolt Ab

Gunnar Karlsson

Håkan Karlsson

Fredrik Laurell

Jonas Hellström

Valdas Pasiskevicius

Sergei Evgenievich Sverchkov

Boris Ivanovic Galagan

Boris Ilich Denker

Jonas HELLSTRÖM

A laser arrangement is provided, in which a Lyot filter arrangement is operative to effect single mode operation. The birefringent element of the Lyot filter arrangement has a cavity folding mirror on one side thereof and a polarizing element on another side thereof, such that the free spectral range of the Lyot filter is improved. Preferably, the Lyot filter arrangement and the laser gain material are located in different branches of the folded cavity.

Frequency stabilized laser source

A microchip laser arrangement is disclosed. The arrangement is operative to emit Q-switched laser pulses at 1.54 &mgr;m. The lasing medium of the laser arrangement is preferably comprised of Yb:Er-glass, and the Q-switch is comprised of a saturable absorber of cobalt doped spinel crystal. The lasing medium is preferably bonded to the absorber to form a monolithic body, upon the surface of which there are deposited dielectric stacks forming a resonant laser cavity. Pumping of the active medium is performed by means of an InGaAs laser diode emitting light at 0.97 &mgr;m, corresponding well with the absorption of the Yb:Er-glass material.

Q-switched laser

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Järfälla, Sweden

Gunnar Karlsson