Ti:sapphire rib channel waveguide fabricated by reactive ion etching of a planar waveguide
We report, to our knowledge, the first active channel waveguide in Ti:sapphire. We have created [similar to] 1.4-μm high ribs in a [similar to] 10-μm thick Ti:sapphire planar waveguide by reactive ion etching. Following excitation by an Ar-ion laser, the rib structure showed channel-waveguide fluorescence emission. The mode profiles and the beam-parameter values (M2) were measured. The coupling efficiency of fluorescence emission into a single-mode fiber was an order of magnitude higher than for fluorescence from unstructured planar regions of the waveguide. Such devices are of interest as low-threshold tunable lasers and as broadband light sources in low-coherence interferometry.
Institute of Applied Optics, Swiss Federal Inst. of Technology, 1015 Lausanne, Switzerland Compilation and indexing terms, Copyright 2008 Elsevier Inc. 02407122338 0946-2171 Planar waveguides
Record created on 2009-01-20, modified on 2016-08-08