Deformed microcavity quantum cascade lasers with directional emission

Citation:

Qijie Wang, Changling Yan, Laurent Diehl, Martina Hentschel, Jan Wiersig, Nanfang Yu, Christian Pfluegl, Mikhail A. Belkin, Tadataka Edamura, Masamichi Yamanishi, Hirofumi Kan, and Federico Capasso. 2009. “Deformed microcavity quantum cascade lasers with directional emission.” NEW JOURNAL OF PHYSICS, 11.

Abstract:

We report the experimental realization of deformed microcavity quantum cascade lasers (QCLs) with a Lima on-shaped chaotic resonator. Directional light emission with a beam divergence of theta(parallel to) approximate to 33 degrees from QCLs emitting at lambda approximate to 10 mu m was obtained in the plane of the cavity for deformations in the range 0.37 < epsilon < 0.43. An excellent agreement between measured and calculated far-field profiles was found. Both simulations and experiments show that the Lima on-shaped microcavity preserves whispering gallery-like modes with high Q-factors for low deformations (epsilon < 0.50). In addition, while the measured spectra show a transition from whispering gallery-like modes to a more complex mode structure at higher pumping currents, we observed `universal far-field behavior' for different intracavity mode distributions in the Lima on
Last updated on 05/23/2020