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The Quest for Athermal Solid-State Etalons

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One possible design forms an optical cavity with extremely low thermal drift using two materials, one of which exhibits a negative temperature coefficient of optical path length.

Mandeep Singh, Dick Neily, William Eccleshall and Bill McCreath

Because of the stringent requirements for frequency stability in dense wavelength division multiplexing (DWDM) systems, demand is continuing to grow for passive optical telecommunications components with high thermal stability. One class of device common in these systems is the etalon, which is essentially an optical cavity that induces multiple beam interference between two reflecting surfaces. Prevalent variants include Fabry-Perot and Gires-Tournois configurations. The devices are common subcomponents in wavelength filters (tunable and fixed), laser wavelength lockers, interleavers and...Read full article

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