Monolithic rare-earth doped sol-gel tapered rib waveguide laser

We report the design, fabrication, and characterization of a monolithic tapered rib waveguide laser made of Nd doped silica hafnia sol-gel. The laser has a 604nm thick guiding layer. CW pumping was coupled in via a grating which also coupled out the lasing signal output, while reflection gratings supported the feedback. A lasing threshold of 20mW and an output power of 2.45mW were measured in a 3cm long device.

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