EXTERNALLY DEPOSITED PHASE-COMPENSATING DIELECTRIC MIRRORS FOR ASYMMETRIC FABRY-PEROT CAVITY TUNING

The wavelength dispersion of the phase shift on reflection that is inh erent in dielectric Bragg mirrors can be used to phase compensate reso nant-cavity-based devices such as multiple quantum well asymmetric Fab ry-Perot spatial light modulators and vertical cavity surface-emitting lasers. We demonstrate the post-growth ability to accurately fine-tun e the location of the Fabry-Perot minima in a resonant cavity by emplo ying either a normal or inverted dielectric mirror configuration. The dielectric multilayer mirrors are composed of alternating quarter-wave layers of MgF2 and Sb2S3, and exhibit broadband reflectivities.