Zobrazeno 1 - 10
of 37
pro vyhledávání: '"U Macherius"'
Autor:
X Lü, B Röben, K Biermann, J R Wubs, U Macherius, K-D Weltmann, J H van Helden, L Schrottke, H T Grahn
We report on terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures, which exhibit single-mode emission at 3.360, 3.921, and 4.745 THz. These frequencies are in close correspondence to fine-structure transitions of Al atoms
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0f591cb82820fd3c7ef3cb869421056
Autor:
J R Wubs, U Macherius, K-D Weltmann, X Lü, B Röben, K Biermann, L Schrottke, H T Grahn, J H van Helden
Publikováno v:
Plasma Sources Science and Technology. 32:025006
This paper describes the first implementation of terahertz (THz) quantum cascade lasers for high-resolution absorption spectroscopy on plasmas. Absolute densities of ground state atomic oxygen were directly obtained by using the fine structure transi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed13128e6d3a1fda257f5fa280a4f500
https://doi.org/10.1088/1361-6595/acb815
https://doi.org/10.1088/1361-6595/acb815
Akademický článek
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Autor:
Jean-Pierre H. van Helden, Jürgen Röpcke, Norbert Lang, Mathias Wiese, U. Macherius, H. Zimmermann, S Glitsch
Publikováno v:
Sensors, Vol 18, Iss 7, p 2058 (2018)
Sensors
Volume 18
Issue 7
Sensors (Basel, Switzerland)
Sensors
Volume 18
Issue 7
Sensors (Basel, Switzerland)
Sensitive trace gas detection plays an important role in current challenges occurring in areas such as industrial process control and environmental monitoring. In particular, for medical breath analysis and for the detection of illegal substances, e.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9e1102f664c17a992210b7a9445d4a9
http://www.mdpi.com/1424-8220/18/7/2058
http://www.mdpi.com/1424-8220/18/7/2058
Autor:
J. H. van Helden, Stefan E. Schulz, Norbert Lang, B. Uhlig, Jürgen Röpcke, U. Macherius, Sven Zimmermann, Matthias Schaller, H. Zimmermann
Publikováno v:
High-Brightness Sources and Light-driven Interactions.
Applying quantum cascade laser absorption spectroscopy a correlation could be demonstrated between the concentration of the etching products SiF4 and CO and the etching rate of ultra-low-k SiCOH in a low-pressure rf plasma containing CF4.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64a8c70bd4c70b12376038c994ec2a67
https://doi.org/10.1364/mics.2018.mt3c.2
https://doi.org/10.1364/mics.2018.mt3c.2
Publikováno v:
Contributions to Plasma Physics. 55:758-773
Plasmas in interaction with surfaces are of key importance in a wide range of applications, which include materials technology, microelectronics, environmental issues, and biomedicine. The intense use of plasma technological processes demands proper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1792778b4b80fc74e21a369068ff655
https://doi.org/10.1002/ctpp.201510016
https://doi.org/10.1002/ctpp.201510016
Akademický článek
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Publikováno v:
Optics express. 24(6)
We report on sensitive detection of atmospheric methane employing quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS). An instrument has been built utilizing a continuous-wave distributed feedback quantum ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::2562058a2c277bc2f2accfd7b08268a2
https://pubmed.ncbi.nlm.nih.gov/27136874
https://pubmed.ncbi.nlm.nih.gov/27136874
Autor:
A S C Nave, Mathias Wiese, J. H. van Helden, H. Zimmermann, U. Macherius, Norbert Lang, Jürgen Röpcke
Publikováno v:
High-Brightness Sources and Light-Driven Interactions.
To improve the efficiency of many industrial plasma processes, more insight into the plasma chemistry is required. Therefore, the detection and quantitative measurement of important species is a major challenge. We will discuss examples of species de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d80fe7f5eecef8339283dc2d66790636
https://doi.org/10.1364/mics.2016.mt1c.2
https://doi.org/10.1364/mics.2016.mt1c.2
Autor:
Jean-Pierre H. van Helden, Mathias Wiese, Jürgen Röpcke, H. Zimmermann, U. Macherius, Norbert Lang
Publikováno v:
Imaging and Applied Optics 2016.
We report on recent progress applying quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy in sensing atmospheric methane in the mid-infrared spectral range. An instrument has been built employing a common V-shaped cav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9321b62c1c4aad9444e244c4001475a
https://doi.org/10.1364/lacsea.2016.lm3g.5
https://doi.org/10.1364/lacsea.2016.lm3g.5