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Title: Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference

Abstract

The far-field distribution of the emission intensity of terahertz (THz) quantum-cascade lasers (QCLs) frequently exhibits multiple lobes instead of a single-lobed Gaussian distribution. We show that such multiple lobes can result from self-interference related to the typically large beam divergence of THz QCLs and the presence of an inevitable cryogenic operation environment including optical windows. We develop a quantitative model to reproduce the multiple lobes. We also demonstrate how a single-lobed far-field distribution can be achieved.

Authors:
; ; ;  [1]
  1. Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5–7, 10117 Berlin (Germany)
Publication Date:
OSTI Identifier:
22611530
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BEAMS; DISTRIBUTION; EMISSION; GAUSS FUNCTION; INTERFERENCE; LASERS; OPACITY; OPERATION; THZ RANGE

Citation Formats

Röben, B., E-mail: roeben@pdi-berlin.de, Wienold, M., Schrottke, L., and Grahn, H. T. Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference. United States: N. p., 2016. Web. doi:10.1063/1.4953596.
Röben, B., E-mail: roeben@pdi-berlin.de, Wienold, M., Schrottke, L., & Grahn, H. T. Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference. United States. doi:10.1063/1.4953596.
Röben, B., E-mail: roeben@pdi-berlin.de, Wienold, M., Schrottke, L., and Grahn, H. T. Wed . "Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference". United States. doi:10.1063/1.4953596.
@article{osti_22611530,
title = {Multiple lobes in the far-field distribution of terahertz quantum-cascade lasers due to self-interference},
author = {Röben, B., E-mail: roeben@pdi-berlin.de and Wienold, M. and Schrottke, L. and Grahn, H. T.},
abstractNote = {The far-field distribution of the emission intensity of terahertz (THz) quantum-cascade lasers (QCLs) frequently exhibits multiple lobes instead of a single-lobed Gaussian distribution. We show that such multiple lobes can result from self-interference related to the typically large beam divergence of THz QCLs and the presence of an inevitable cryogenic operation environment including optical windows. We develop a quantitative model to reproduce the multiple lobes. We also demonstrate how a single-lobed far-field distribution can be achieved.},
doi = {10.1063/1.4953596},
journal = {AIP Advances},
number = 6,
volume = 6,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}