Guided blue and green upconversion fluorescence in an erbium-ytterbium-containing silicate glass.

We observe guided blue and green upconversion fluorescence in an ion-exchanged waveguide that is fabricated in an erbium-ytterbium-codoped silicate laser glass. The guides are optically pumped at room temperature by using a Ti:sapphire laser with lambda = 880-980 nm; the observed fluorescence is in two bands, 480-490 and 520-560 nm, and results from multiphoton excitation.

GaAs/AlGaAs integrated-optic wavelength demultiplexer.

An integrated-optic dual-channel wavelength (de)multiplexer is demonstrated on a GaAs/AlGaAs heterostructure. The device, an asymmetric Mach-Zehnder interferometer, operates with a channel separation of 19 nm in the 1500-nm-wavelength range.