Suppression of pointing instability in quantum cascade lasers by transverse mode control

Pierre M. Bouzi; Peter Q. Liu; Nyan Aung; Xiaojun Wang; Jen Yu Fan; Mariano Troccoli; Claire F. Gmachl

doi:10.1063/1.4798656

Suppression of pointing instability in quantum cascade lasers by transverse mode control

Pierre M. Bouzi, Peter Q. Liu, Nyan Aung, Xiaojun Wang, Jen Yu Fan, Mariano Troccoli, Claire F. Gmachl

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65, without significant increase in threshold.

Original language	English (US)
Article number	122105
Journal	Applied Physics Letters
Volume	102
Issue number	12
DOIs	https://doi.org/10.1063/1.4798656
State	Published - Mar 25 2013

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4798656

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abstract = "We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65, without significant increase in threshold.",

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T1 - Suppression of pointing instability in quantum cascade lasers by transverse mode control

AU - Bouzi, Pierre M.

AU - Liu, Peter Q.

AU - Aung, Nyan

AU - Wang, Xiaojun

AU - Fan, Jen Yu

AU - Troccoli, Mariano

AU - Gmachl, Claire F.

PY - 2013/3/25

Y1 - 2013/3/25

N2 - We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65, without significant increase in threshold.

AB - We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65, without significant increase in threshold.

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JF - Applied Physics Letters

IS - 12

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Suppression of pointing instability in quantum cascade lasers by transverse mode control

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