Disorder mapping in VCSELs using frequency-selective feedback.

Optics letters

PubMedID: 22446231

Ackemann T, Radwell N, Noblet Y, Jäger R. Disorder mapping in VCSELs using frequency-selective feedback. Opt Lett. 2012;37(6):1079-81.
We report on a simple method with a high spectral and spatial resolution for mapping variations in the cavity resonance of a plano-planar broad-area laser based on frequency-selective feedback. The demonstration experiment uses a vertical-cavity surface-emitting-laser (VCSEL), in which growth induced inhomogeneities are of particular importance. It relies only on a standalone laser with a narrow-bandwidth passive filter avoiding the need for an expensive tunable laser or high-resolution spectrometer.