Publication detail

Color switching of a terahertz quantum cascade laser

Kainz, MA. Schonhuber, S. Limbacher, B. Andrews, AM. Detz, H. Strasser, G. Bastard, G. Unterrainer, K.

Original Title

Color switching of a terahertz quantum cascade laser

English Title

Color switching of a terahertz quantum cascade laser

Type

journal article in Web of Science

Language

en

Original Abstract

The mode formation of a terahertz Quantum Cascade laser with two optical transitions is studied experimentally. The emission spectrum shows two well separated frequency regions at 3.4 THz and 3.8 THz corresponding to two different upper laser states j3i and j4i. From the relative strength of the two colors, population and electron scattering effects for the two states are investigated at different operating temperatures and in the presence of a strong magnetic field. At elevated temperatures, the population of state j3i is continuously reduced, resulting in only the 3.8 THz transition lasing at 140 K. For an applied magnetic field, the elastic scattering channel from j4i ! j3i is progressively suppressed, resulting in laser emission switching from 3.4 THz to 3.8 THz.

English abstract

The mode formation of a terahertz Quantum Cascade laser with two optical transitions is studied experimentally. The emission spectrum shows two well separated frequency regions at 3.4 THz and 3.8 THz corresponding to two different upper laser states j3i and j4i. From the relative strength of the two colors, population and electron scattering effects for the two states are investigated at different operating temperatures and in the presence of a strong magnetic field. At elevated temperatures, the population of state j3i is continuously reduced, resulting in only the 3.8 THz transition lasing at 140 K. For an applied magnetic field, the elastic scattering channel from j4i ! j3i is progressively suppressed, resulting in laser emission switching from 3.4 THz to 3.8 THz.

Keywords

Quantum Cascade laser

Released

13.05.2019

Pages from

119104

Pages to

119104

Pages count

5

URL

Documents

BibTex


@article{BUT159147,
  author="Hermann {Detz}",
  title="Color switching of a terahertz quantum cascade laser",
  annote="The mode formation of a terahertz Quantum Cascade laser with two optical transitions is studied experimentally. The emission spectrum shows two well separated frequency regions at 3.4 THz and 3.8 THz corresponding to two different upper laser states j3i and j4i. From the relative strength of the two colors, population and electron scattering effects for the two states are investigated at different operating
temperatures and in the presence of a strong magnetic field. At elevated temperatures, the population of state j3i is continuously reduced, resulting in only the 3.8 THz transition lasing at 140 K. For an applied magnetic field, the elastic scattering channel from j4i ! j3i is
progressively suppressed, resulting in laser emission switching from 3.4 THz to 3.8 THz.",
  chapter="159147",
  doi="10.1063/1.5093901",
  howpublished="print",
  number="19",
  volume="114",
  year="2019",
  month="may",
  pages="119104--119104",
  type="journal article in Web of Science"
}