Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Jens Wolfgang Tomm"'
Publikováno v:
Materials Science and Engineering: B. 74:61-65
GaAs/GaAlAs quantum well (QW) structures with a graded-index waveguide (GRIN) designed for high-power laser arrays have been studied by photocurrent spectroscopy in relation to temperature and polarization. Optical transitions between confined QW sta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a143b6a10194b1c7b188a0d60d91f586
https://doi.org/10.1016/s0921-5107(99)00535-8
https://doi.org/10.1016/s0921-5107(99)00535-8
Autor:
Jens Wolfgang Tomm, A. Baerwolff
Publikováno v:
SPIE Proceedings.
Ion-implanted vertical cavity surface emitting lasers are analyzed by photocurrent spectroscopy. The photoelectric quantum efficiency of such a device was found to reveal information on the presence of defect levels within the device. Photocurrent sp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c979f0a1d463741d448e92f198a84e69
https://doi.org/10.1117/12.384384
https://doi.org/10.1117/12.384384
Publikováno v:
SPIE Proceedings.
The current transport through GaAs/GaAlAs quantum well graded index (QW GRIN) injection lasers was studied by photocurrent spectroscopy. The quantum efficiency is assumed to be proportional to the absorption coefficient. The observed absorption edges
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43f7791cf934e82f112a87cca7a6eecd
https://doi.org/10.1117/12.368332
https://doi.org/10.1117/12.368332
Autor:
Jens Wolfgang Tomm, Klaus H. Herrmann
Publikováno v:
SPIE Proceedings.
GaAs/GaAlAs quantum well (QW) structures for graded index (GRIN) near IR injection lasers have been studied by polarization dependent photocurrent spectroscopy in the spectral region of QW transitions and in a wide range of temperatures 20 K
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::acfe43496d01554af814bfcf7154e387
https://doi.org/10.1117/12.368330
https://doi.org/10.1117/12.368330
Autor:
Georgiy G. Tarasov, W. Hoerstel, Yuri I. Mazur, Jens Wolfgang Tomm, S. R. Lavoric, Andrey S. Rakitin
Publikováno v:
SPIE Proceedings.
Phonon-assisted self-trapping of free carrier is considered in diluted semimagnetics. It is shown that the binding energy of free magnetic polaron can be substantially larger when the 'spin-phonon' coupling is taken into account. For the particular c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f9e4fd0369f68cac2493c26b6520e7b
https://doi.org/10.1117/12.280445
https://doi.org/10.1117/12.280445
Autor:
Jens Wolfgang Tomm, B. K. Wagner, Stuart M. Jacobsen, T. K. Tran, Wounjhang Park, S. K. McClelland, Christopher J. Summers, P. N. Yocom
Publikováno v:
SPIE Proceedings.
We present the results of a systematic photoluminescence study of ZnGa2O4:Mn phosphor powder. This phosphor exhibits bright green luminescence with a spectral peak at 2.46 eV and CIE chromaticity coordinates of x equals 0.073 and y equals 0.696 at ro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c397dad2e74115bc1424a4b33b22c7e
https://doi.org/10.1117/12.218195
https://doi.org/10.1117/12.218195
Publikováno v:
International Conference on Excitonic Processes in Condensed Matter.
We present a study of the excitonic luminescence contribution in Hg1-xCdxTe for a wide CdTe mole fraction range (0.23 < x < 0.97). This mixed crystal semiconductor system is relatively well understood and offers a unique possibility to study the cont
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd471d9ce04e57394f5a72ea95bebc86
https://doi.org/10.1117/12.200956
https://doi.org/10.1117/12.200956
Autor:
Yuri I. Mazur, S. I. Kriven, Jens Wolfgang Tomm, N. V. Shevchenko, S. R. Lavorik, Georgiy G. Tarasov
Publikováno v:
SPIE Proceedings.
Optical diagnostics of HgCdMnTe, HgCdMnSe narrow-gap semiconductors have been performed by means of FIR vibrational spectroscopy and IR luminescence for the case of low manganese content. Primary attention is given to the spectral features attributed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e563c2b30484b2638959e643c589f7b
https://doi.org/10.1117/12.191988
https://doi.org/10.1117/12.191988
Autor:
Klaus–Peter Möllmann, Jens Wolfgang Tomm, Frank Peuker, Klaus H. Herrmann, Harald Böttner, Maurus Tacke, M. Happ
Publikováno v:
Japanese Journal of Applied Physics. 33:1928
The results of a study of the optical properties, especially the luminescence behaviour, of PbSe, Pb1-xSrxSe and semimagnetic Pb1-xEuxSe in magnetic fields up to 7 T are presented. The spectra of PbSe and Pb1-xSrxSe consisting of single lines are int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::454719f638164555452270837f4adfc0
https://doi.org/10.1143/jjap.33.1928
https://doi.org/10.1143/jjap.33.1928