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DOI: 10.1063/1.3153276
¤ OpenAccess: Green
This work has “Green” OA status. This means it may cost money to access on the publisher landing page, but there is a free copy in an OA repository.

Directional emission and universal far-field behavior from semiconductor lasers with limaçon-shaped microcavity

Chao Yan,Qi Jie Wang,Laurent Diehl,Martina Hentschel,Jan Wiersig,Nanfang Yu,Christian Pflügl,Federico Capasso,Mikhail Belkin,Tadataka Edamura,Masamichi Yamanishi,Hirofumi Kan

Semiconductor laser theory
Whispering-gallery wave
Resonator
2009
We report experimental demonstration of directional light emission from limaçon-shaped microcavity semiconductor lasers. Quantum cascade lasers (QCLs) emitting at λ≈10 μm are used as a model system. Both ray optics and wave simulations show that for deformations in the range 0.37<ε<0.43, these microcavities support high quality-factor whispering gallerylike modes while having a directional far-field profile with a beam divergence θ∥≈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 ε=0.40.
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    Directional emission and universal far-field behavior from semiconductor lasers with limaçon-shaped microcavity” is a paper by Chao Yan Qi Jie Wang Laurent Diehl Martina Hentschel Jan Wiersig Nanfang Yu Christian Pflügl Federico Capasso Mikhail Belkin Tadataka Edamura Masamichi Yamanishi Hirofumi Kan published in 2009. It has an Open Access status of “green”. You can read and download a PDF Full Text of this paper here.