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

Changling Yan; Qi Jie Wang; Diehl, Laurent; Hentschel, Martina; Jan Wiersig; Nanfang Yu; Pflügl, Christian; Capasso, Federico; Belkin, Mikhail A.; Edamura, Tadataka; Yamanishi, Masamichi; Hirofumi Kan
June 2009
Applied Physics Letters;6/22/2009, Vol. 94 Issue 25, p251101
Academic Journal
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<[variant_greek_epsilon]<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 [variant_greek_epsilon]=0.40.


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