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High-contrast waveguides in crystalline potassium double tungstates pave the road towards compact and efficient on-chip amplifiers. In this work, the design and fabrication of erbium doped high contrast potassium double tungstates waveguides will be described.
The monoclinic double tungstate crystals are good candidates as host materials for rare-earth ions. Thanks to their crystalline nature, clustering of doping ions is avoided. High concentrations of active ions can therefore be achieved, which, together with the large absorption and emission cross sections of the active ions in these materials, leads to compact and efficient on-chip amplifiers and lasers...
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