Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Teresa Lermer"'
Autor:
Adrian Stefan Avramescu, Teresa Lermer, Thomas Hager, Jens Müller, Christoph Eichler, Georg Brüderl, Alfred Lell, Uwe Strauss
Publikováno v:
physica status solidi (a). 209:481-486
InGaN quantum wells for direct green lasers with indium concentrations of about 30% are studied in respect to defect structure and influence of defects on device lifetime. A new test structure enables us to determine strain relaxation in In-rich laye
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db965dd55b70b79ccdfb9ab51efe22e4
https://doi.org/10.1002/pssa.201100454
https://doi.org/10.1002/pssa.201100454
Autor:
Christoph Eichler, Sönke Tautz, Adrian Stefan Avramescu, Uwe Strauss, Georg Bruederl, Jens Müller, Teresa Lermer, Stephan Lutgen
Publikováno v:
SID Symposium Digest of Technical Papers. 42:685-688
We report on direct green lasers based on nitride semiconductors that are suitable for mobile projection applications. The TO38 packaged lasers achieved in continuous wave operation at 522nm wavelength more than 80mW optical power. The wall plug effi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6dc05f74a70400f99457f8ba7f3a8dbe
https://doi.org/10.1889/1.3621416
https://doi.org/10.1889/1.3621416
Autor:
Ines Pietzonka, Adrian Stefan Avramescu, Teresa Lermer, Jens Müller, Uwe Strauss, Georg Brüderl, Stephan Lutgen
Publikováno v:
physica status solidi (a). 208:1199-1202
The origin of indium fluctuations in indium-rich quantum wells (QWs) is of high interest for direct green laser diodes. We present the correlation of morphological features such as macrosteps investigated by AFM measurements and wavelength fluctuatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::86da36043ed8a3754ec90ee6d2967b95
https://doi.org/10.1002/pssa.201000695
https://doi.org/10.1002/pssa.201000695
Autor:
Dieter Weiss, Janusz Sadowski, Werner Wegscheider, Stefan Geissler, Teresa Lermer, Markus Schlapps
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 42:2676-2680
We report on magnetotransport measurements of nanoconstricted (Ga,Mn)As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature dependent measurements do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45a0e7ed879b57584f964b5cf9ec3fa9
https://doi.org/10.1016/j.physe.2009.12.055
https://doi.org/10.1016/j.physe.2009.12.055
Autor:
Christoph Eichler, Teresa Lermer, Adrian Stefan Avramescu, Georg Brüderl, Stephan Lutgen, Désirée Queren, Uwe Strauß, Alvaro Gomez-Iglesias, Jens Müller
Publikováno v:
physica status solidi (b). 248:652-657
The challenges of green InGaN lasers are discussed concerning material quality as a function of InGaN composition, quantum well design and piezoelectrical fields. Investigations of polar quantum well designs and comparison with simulated non-polar st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f28380d23f9d0ed797588d1055c63bc7
https://doi.org/10.1002/pssb.201046299
https://doi.org/10.1002/pssb.201046299
Autor:
Uwe Strauss, Jens Müller, Adrian Stefan Avramescu, Georg Bruederl, Stephan Lutgen, Teresa Lermer, Désirée Queren
Publikováno v:
physica status solidi (a). 207:1318-1322
We present true green InGaN ridge waveguide (RWG) laser diodes (LDs) at 520 nm on c-plane GaN substrates in pulse operation at room temperature. Defect reduction in the In-rich quantum wells by improving growth conditions of the epitaxial layers is t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccaf4c20db7098b59b3f9b9a621b1005
https://doi.org/10.1002/pssa.200983620
https://doi.org/10.1002/pssa.200983620
Autor:
Marc Schillgalies, Christoph Eichler, Andreas Breidenassel, Adrian Stefan Avramescu, Uwe Strauss, Jens Müller, Ulrich T. Schwarz, Stephan Lutgen, Teresa Lermer, Désirée Queren, W. G. Scheibenzuber
Publikováno v:
physica status solidi (a). 207:1328-1331
In this paper we investigate the waveguiding (WG) of direct green InGaN laser diodes grown on c-plane GaN substrates. The problem of parasitic modes emerges due to the reduced refractive index difference between the GaN waveguide and AlGaN cladding l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::054c4c8282ef736bdf97d10290a413e6
https://doi.org/10.1002/pssa.200983410
https://doi.org/10.1002/pssa.200983410
Publikováno v:
physica status solidi (a). 208:1600-1602
We present a highly precise method to determine the thermal resistance and the antiguiding factor of (Al,In)GaN laser diodes. Knowing the thermal resistance, we are able to exclude thermal effects and study the charge carrier density dependence of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bf2c2be71246edc98ea30fe50059d9a
https://doi.org/10.1002/pssa.201001162
https://doi.org/10.1002/pssa.201001162
Autor:
Christoph Eichler, Jens Müller, Teresa Lermer, Stephan Lutgen, Georg Brüderl, Adrian Stefan Avramescu, Uwe Strauß
Publikováno v:
physica status solidi (a). 208:1590-1592
We present analysis of the experimentally determined gain coefficients g 0 for green InGaN lasers with pulsed wavelengths from 495 to 526 nm. Variable facet coating as well as variable cavity length method are used to deduce the dependency of go on w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21facb4062e89da7a57621237dc56981
https://doi.org/10.1002/pssa.201000948
https://doi.org/10.1002/pssa.201000948
Autor:
Bernhard Stojetz, Uwe Strauss, Christoph Eichler, Teresa Lermer, Adrian Avramescu, Clemens Vierheilig, Soenke Tautz, Thomas Hager, Georg Bruederl
Publikováno v:
2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR).
Summary form only given. Two fields for laser projection have attended big interest since several years due to the potential of high volume markets. One is the mobile projection; ideally a projection unit embedded in a mobile phone. For customer acce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d016f259b9ef145393764f023cac4cf
https://doi.org/10.1109/cleopr.2013.6599912
https://doi.org/10.1109/cleopr.2013.6599912