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Disorder mapping in VCSELs using frequency-selective feedback

Ackemann, Thorsten and Radwell, Neal Matthew and Noblet, Yoann and Jaeger, R. (2012) Disorder mapping in VCSELs using frequency-selective feedback. Optics Letters, 37 (6). pp. 1079-1081. ISSN 0146-9592

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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.