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Your search keyword '"Axel Strömberg"' showing total 3 results
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3 results on '"Axel Strömberg"'

1. Reverse-Taper Mid-IR Quantum Cascade Lasers for Coherent Power Scaling

Author

Yan-Ting Sun, B. Knipfer, Steve Jacobs, Axel Strömberg, Morgan Turville-Heitz, Dan Botez, Robert A. Marsland, Jeremy Kirch, Sebastian Lourdudoss, Luke J. Mawst, Jae Ha Ryu, Tom Earles, and C. Sigler

Subjects
Materials science, Cascade, business.industry, law, Optoelectronics, Laser power scaling, business, Laser, Quantum, law.invention
Published
2021
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2. Direct Heteroepitaxy of Orientation-Patterned GaP on GaAs by Hydride Vapour Phase Epitaxy for Quasi-Phase-Matching Applications

Author

Bruno Gérard, Valdas Pasiskevicius, Fredrik Laurell, Giriprasanth Omanakuttan, Tajkia Syeed Tofa, Axel Strömberg, Pooja Vardhini Natesan, Hoon Jang, Yan-Ting Sun, A. Grisard, and Sebastian Lourdudoss

Subjects
Quasi-phase-matching, Materials science, business.industry, Hydride, Terahertz radiation, Hydride vapour phase epitaxy, Optoelectronics, Conductivity, business, Spectroscopy, Epitaxy, Terahertz time-domain spectroscopy
Abstract

Heteroepitaxial growth of orientation-patterned GaP on patterned GaAs template was developed by using hydride vapor phase epitaxy for quasi-phase-matching applications. We present the growth with well-defined periodic boundaries between (001) and (00 1) GaP domains. The GaP layer on planar GaAs was characterized by terahertz time-domain spectroscopy and the conductivity of GaP (0.16 S cm−1) was obtained in terahertz range.

Published
2019
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3. Reverse-Taper Mid-Infrared Quantum Cascade Lasers for Coherent Power Scaling

Author

Jae Ha Ryu, Benjamin Knipfer, Jeremy D. Kirch, Robert A. Marsland, Dan Botez, Tom Earles, Chris Galstad, Morgan Turville-Heitz, Chris Sigler, Axel Stromberg, Yan-Ting Sun, Sebastian Lourdudoss, and Luke J. Mawst

Subjects
Quantum cascade lasers, beam steering, semiconductor growth, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

We present a reverse-taper quantum cascade laser (QCL) emitting at 4.6 μm, a novel-geometry device that can scale the output power while maintaining good beam quality. Buried-ridge waveguides with tapered and straight regions were formed by ICP etching and HVPE regrowth – the tapered region scales the output power, while the emitting facet is located at the narrow-end taper section, which provides mode filtering by suppressing high-order spatial modes. Beam profiles were observed under quasi-continuous-wave (QCW)/CW operation and beam quality (M2) measurements along with beam-stability measurements were performed – a small degree of collimated-beam centroid movement (2 values close to 1 up to ∼1 W QCW power. Devices of shorter cavity lengths were also investigated, indicating that the output power scales with the core-region volume but results in a small increase in angular deviation.

Published
2022
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