We report a monolithic low threshold 482nm Tm:ZBLAN upconversion fiber laser. The laser cavity consists of a directly coated single-mode fluoride fiber. The vapor deposit coatings significantly reduce the coupling losses and are suitable to be pumped by laser diodes. The laser operation and threshold characteristics have been investigated. The output stability and beam quality was tested.
We present the stabilization of an intracavity frequency doubled blue Nd:YAG laser. A single stripe 1 W/808 nm laser diode was used for longitudinal end-pumping of a half- monolithic Nd:YAG/KNbO3 473 nm microlaser. A quarter- wave plate (QWP) was used inside the cavity to suppress the large amplitude noise. An adjustment of the QWP with a rotation angle of 45 degree(s) referring to the ordinary axis of the KNbO3 crystal resulted in a suppression of the noise in the blue laser emission.
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