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Rectangular ring lasers based on an active vertical coupler structure are fabricated through asymmetric double shallow ridge and ICP/ICP cascade etching. 25% reduction of Ith and the single mode operation with SMSR 23dB are achieved.
Directional dependence of optical radiation from photonic crystal double heterostructure resonant cavities is analyzed using the finite-difference time-domain method. Geometries that mitigate out-of-plane radiation loss with dielectric substrates are analyzed.
We report a dramatic reduction in the linewidth of the carrier envelope offset frequency of a frequency comb generated by a femtosecond prism-based Cr:forsterite laser due to changes in the wavelength-dependent intracavity loss.
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