Directional Emission and Universal Far-Field Behavior from Semiconductor Lasers with Limacon-Shaped Microcavity
Wang, Qi Jie
Belkin, Mikhail A.
Pflügl, ChristianNote: Order does not necessarily reflect citation order of authors.
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CitationYan, Changling, Qi Jie Wang, Laurent Diehl, Martina Hentschel, Jan Wiersig, Nanfang Yu, Christian Pflügl et al. 2009. Directional emission and universal far-field behavior from semiconductor lasers with limacon-shaped microcavity. Applied Physics Letters 94(25): 251101.
AbstractWe report experimental demonstration of directional light emission from limaçon-shaped microcavity semiconductor lasers. Quantum cascade lasers (QCLs) emitting at \(\lambda \approx 10 \mu m\) are used as a model system. Both ray optics and wave simulations show that for deformations in the range \(0.37< \epsilon <0.43\), these microcavities support high quality-factor whispering gallerylike modes while having a directional far-field profile with a beam divergence \(\theta \approx 30°\) in the plane of the cavity. The measured far-field profiles are in good agreement with simulations. While the measured spectra show a transition from whispering gallerylike modes to a more complex mode structure at higher pumping currents, the far field is insensitive to the pumping current demonstrating the predicted “universal far-field behavior” of this class of chaotic resonators. Due to their relatively high quality factor, our microcavity lasers display reduced threshold current densities compared to conventional ridge lasers with millimeter-long cavities. The performance of the limaçon-shaped QCLs is robust with respect to variations of the deformation near its optimum value of \( \epsilon = 0.40\).
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:5096753
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