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Probing the electronic and optical properties of quantum cascade lasers under operating conditions

Revin, D.G.; Soulby, M.R.; Cockburn, J.W.; Krysa, A.B.; Roberts, J.S.; Airey, R.J.; Nelander, Rikard LU ; Wacker, Andreas LU and Pereira, M. (2006) Optical Methods in the Life Sciences In Proceedings of SPIE, the International Society for Optical Engineering 6386. p.1-63860
Abstract
We report the realisation of spectroscopic broadband transmission experiments on quantum cascade lasers (QCLs)

under continuous wave operating conditions for drive currents up to laser threshold. This technique allows, for the first time, spectroscopic study of light transmission through the waveguide of QCLs in a very broad spectral range (λ~1.5-12 μm), limited only by the detector response and by interband absorption in the materials used in the QCL cladding regions. Waveguide transmittance spectra have been studied for both TE and TM polarization, for InGaAs/InAlAs/InP QCLs with different active region designs emitting at 7.4 and 10μm. The transmission measurements clearly show the depopulation of the lower laser levels as bias... (More)
We report the realisation of spectroscopic broadband transmission experiments on quantum cascade lasers (QCLs)

under continuous wave operating conditions for drive currents up to laser threshold. This technique allows, for the first time, spectroscopic study of light transmission through the waveguide of QCLs in a very broad spectral range (λ~1.5-12 μm), limited only by the detector response and by interband absorption in the materials used in the QCL cladding regions. Waveguide transmittance spectra have been studied for both TE and TM polarization, for InGaAs/InAlAs/InP QCLs with different active region designs emitting at 7.4 and 10μm. The transmission measurements clearly show the depopulation of the lower laser levels as bias is increased, the onset and growth of optical amplification at the energy corresponding to the laser transitions as current is increased towards threshold, and the thermal filling of the second laser level and decrease of material gain at high temperatures. This technique also allows direct determination of key parameters such as the exact temperature of the laser core region under operating conditions, as well as the modal gain and waveguide loss coefficients. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of SPIE, the International Society for Optical Engineering
volume
6386
pages
8 pages
conference name
Optical Methods in the Life Sciences
external identifiers
  • Scopus:33846209074
DOI
10.1117/12.692334
language
English
LU publication?
yes
id
829acb8e-5547-466f-8a92-e7755981d05f (old id 945146)
date added to LUP
2008-01-23 11:04:51
date last changed
2016-10-13 05:03:09
@misc{829acb8e-5547-466f-8a92-e7755981d05f,
  abstract     = {We report the realisation of spectroscopic broadband transmission experiments on quantum cascade lasers (QCLs)<br/><br>
under continuous wave operating conditions for drive currents up to laser threshold. This technique allows, for the first time, spectroscopic study of light transmission through the waveguide of QCLs in a very broad spectral range (λ~1.5-12 μm), limited only by the detector response and by interband absorption in the materials used in the QCL cladding regions. Waveguide transmittance spectra have been studied for both TE and TM polarization, for InGaAs/InAlAs/InP QCLs with different active region designs emitting at 7.4 and 10μm. The transmission measurements clearly show the depopulation of the lower laser levels as bias is increased, the onset and growth of optical amplification at the energy corresponding to the laser transitions as current is increased towards threshold, and the thermal filling of the second laser level and decrease of material gain at high temperatures. This technique also allows direct determination of key parameters such as the exact temperature of the laser core region under operating conditions, as well as the modal gain and waveguide loss coefficients.},
  author       = {Revin, D.G. and Soulby, M.R. and Cockburn, J.W. and Krysa, A.B. and Roberts, J.S. and Airey, R.J. and Nelander, Rikard and Wacker, Andreas and Pereira, M.},
  language     = {eng},
  pages        = {1--63860},
  series       = {Proceedings of SPIE, the International Society for Optical Engineering},
  title        = {Probing the electronic and optical properties of quantum cascade lasers under operating conditions},
  url          = {http://dx.doi.org/10.1117/12.692334},
  volume       = {6386},
  year         = {2006},
}