Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers
Pavlov, S.G. and Eichholz, R. and Abrosimov, N.V. and Riemann, H. and Wienold, M. and Schrottke, L. and Giehler, M. and Hey, R. and Grahn, H.T. and Tredicucci, A. and Beere, H.E. and Ritchie, D.A. and Hübers, H.-W. (2010) Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers. In: Proc. of the 2nd IEEE Int. Workshop on THz radiation: Basic Research and Applications, pp. 245-247. IEEE. TERA 2010, 12.-14. Sep. 2010, Sevastopol, Ukraine. ISBN 978-1-4244-6995-6.
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Terahertz-range intracenter silicon lasers have demonstrated significant progress over past decade in expanding the frequency operation range, in manipulation of a silicon matrix as well as in lowering of optical pump threshold. While terahertz gain realized in silicon lasers has been already defined, optical losses in the active media have not been yet measured experimentally. We applied continuous wave terahertz quantum cascade lasers, operating at 2.5 THz and 3.1 THz for direct measurements of the light losses at conditions of optical pumping with pump intensities exceeding laser thresholds for corresponding media. These measurements allow estimates of THz losses as well as determination of physical mechanisms mainly contributing for total THz absorption in optically excited silicon. It was found that absorption by so called D¯-centers, dynamically induced in optically excited silicon, cause major loss of THz emission. These losses, however, can be significantly reduced by a proper procedure of crystal growth and doping.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Using terahertz cascade lasers for determination of optical losses in active medium of silicon intracenter lasers|
|Journal or Publication Title:||Proc. of the 2nd IEEE Int. Workshop on THz radiation: Basic Research and Applications|
|Page Range:||pp. 245-247|
|Keywords:||THz, silicon laser, quantum cascade laser|
|Event Title:||TERA 2010|
|Event Location:||Sevastopol, Ukraine|
|Event Type:||international Conference|
|Event Dates:||12.-14. Sep. 2010|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V VM - Verkehrsmanagement|
|DLR - Research area:||Transport|
|DLR - Program:||V VM - Verkehrsmanagement|
|DLR - Research theme (Project):||V - FAMOUS (old)|
|Institutes and Institutions:||Institute of Planetary Research > Terahertz and Infrared Sensors|
|Deposited By:||Dr. Sergey Pavlov|
|Deposited On:||04 Jan 2011 21:52|
|Last Modified:||11 Jan 2011 12:37|
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