Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Mehran Shahmohammadi"'
Autor:
Sergej Markmann, Martin Franckié, Mathieu Bertrand, Mehran Shahmohammadi, Andres Forrer, Pierre Jouy, Mattias Beck, Jérôme Faist, Giacomo Scalari
Publikováno v:
Communications Physics, Vol 6, Iss 1, Pp 1-12 (2023)
Fast and high-resolution Fourier transform spectrometers are indispensable for cutting-edge infrared spectroscopy. In this study, the authors employed a newly-designed fast-rotating retroreflective, broadband delay line demonstrating fast dual-comb s
Externí odkaz:
https://doaj.org/article/482854c502294e0090c38a43fd78bb16
Autor:
Tecla Gabbrielli, Natalia Bruno, Nicola Corrias, Simone Borri, Luigi Consolino, Mathieu Bertrand, Mehran Shahmohammadi, Martin Franckié, Mattias Beck, Jérôme Faist, Alessandro Zavatta, Francesco Cappelli, Paolo De Natale
Publikováno v:
Advanced Photonics Research, Vol 3, Iss 10, Pp n/a-n/a (2022)
A novel study on harmonic frequency combs emitted by quantum cascade lasers (QCLs) is presented here, demonstrating the presence of intensity correlations between twin modes characterizing the emission spectra. These originate from a four‐wave mixi
Externí odkaz:
https://doaj.org/article/87afc301fa8d4e978393b725ced471c5
Autor:
Mehran Shahmohammadi, Martin J Süess, Romain Peretti, Filippos Kapsalidis, Andres Forrer, Mattias Beck, Jérôme Faist
Publikováno v:
New Journal of Physics, Vol 24, Iss 5, p 053047 (2022)
A laser exhibits both controllable gain and loss and, under proper design conditions, is an ideal non-Hermitian system allowing the direct observation and engineering of spectral singularities such as exceptional points (EPs). A dual section distribu
Externí odkaz:
https://doaj.org/article/3e7fc07dacc546f8a2aba3df21a0e5c8
Autor:
Sergej Markmann, Martin Franckié, Mathieu Bertrand, Mehran Shahmohammadi, Andres Forrer, Pierre Jouy, Mattias Beck, Jérôme Faist, Giacomo Scalari
Publikováno v:
Communications Physics, 6 (1)
Fast (sub-second) spectroscopy with high spectral resolution is of vital importance for revealing quantum chemistry kinetics of complex chemical and biological reactions. Fourier transform (FT) spectrometers can achieve high spectral resolution and o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1afd6f0744a73997db00ab60b31a6c03
http://arxiv.org/abs/2204.12396
http://arxiv.org/abs/2204.12396
Autor:
Tecla Gabbrielli, Natalia Bruno, Nicola Corrias, Simone Borri, Luigi Consolino, Mathieu Bertrand, Mehran Shahmohammadi, Martin Franckié, Mattias Beck, Jérôme Faist, Alessandro Zavatta, Paolo De Natale, Francesco Cappelli
Publikováno v:
Optica Advanced Photonics Congress 2022.
We demonstrate the presence of intensity correlation in the harmonic comb emitted by quantum cascade lasers, paving the way for a deeper understanding of the role of the four-wave-mixing process enabling this emission.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9fb54a087fc429ecf5771cb0e4f47120
https://doi.org/10.1364/np.2022.nptu4f.2
https://doi.org/10.1364/np.2022.nptu4f.2
Coherently-averaged dual comb spectrometer at 7.7 µm with master and follower quantum cascade lasers
Autor:
Giulio Terrasanta, Thomas Südmeyer, Jérôme Faist, Kenichi Komagata, Stéphane Schilt, Atif Shehzad, Mattias Beck, Renaud Matthey, Andreas Hugi, Lukas Emmenegger, Pierre Brochard, Mehran Shahmohammadi, Valentin J. Wittwer, Filippos Kapsalidis, Michele Gianella, Pierre Jouy
Publikováno v:
Optics express. 29(12)
We demonstrate coherent averaging of the multi-heterodyne beat signal between two quantum cascade laser frequency combs in a master-follower configuration. The two combs are mutually locked by acting on the drive current to control their relative off
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adca4ffdf91ca8908ff8b749a6955bfe
https://pubmed.ncbi.nlm.nih.gov/34154154
https://pubmed.ncbi.nlm.nih.gov/34154154
Coherently-Averaged Dual-Comb Spectrometer at 7.7 µm with Master and Follower Quantum Cascade Lasers
Autor:
Pierre Jouy, Thomas Südmeyer, Stéphane Schilt, Andreas Hugi, Jérôme Faist, Renaud Matthey, Filippos Kapsalidis, Pierre Brochard, Michele Gianella, Kenichi Komagata, Mehran Shahmohammadi, Mattias Beck, Atif Shehzad, Lukas Emmenegger, Giulio Terrasanta, Valentin J. Wittwer
Publikováno v:
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC).
Mid-infrared (MIR) quantum cascade laser (QCL) frequency combs are an appealing technology for dual-comb spectroscopy as they cover strong absorption bands of many relevant molecules in the MIR region and enable measurements with sub-microsecond time
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::471e641537d8155f3bc9ed307558f444
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542530
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542530
Autor:
Marin Hamrouni, Kenichi Komagata, Mehran Shahmohammadi, Atif Shehzad, Jérôme Faist, Stéphane Schilt, Andreas Hugi, Renaud Matthey, M. Beck, Filippos Kapsalidis, Pierre Jouy, Thomas Südmeyer, Valentin J. Wittwer
Publikováno v:
Conference on Lasers and Electro-Optics.
High-resolution spectroscopy in the mid-infrared requires stable frequency references. A frequency comb emitted by a quantum cascade laser is locked to a molecular transition, demonstrating 30-kHz frequency stability up to 5000-s integration time.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f33d3a5558a02341ae0a4e6964cbf35f
https://doi.org/10.1364/cleo_si.2021.stu1h.3
https://doi.org/10.1364/cleo_si.2021.stu1h.3
Autor:
Atif, Shehzad, Pierre, Brochard, Renaud, Matthey, Filippos, Kapsalidis, Mehran, Shahmohammadi, Mattias, Beck, Andreas, Hugi, Pierre, Jouy, Jérôme, Faist, Thomas, Südmeyer, Stéphane, Schilt
Publikováno v:
Optics express. 28(6)
The generation of frequency combs in the mid-infrared (MIR) spectral range by quantum cascade lasers (QCLs) has the potential for revolutionizing dual-comb multi-heterodyne spectroscopy in the molecular fingerprint region. However, in contrast to fre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::eb3a160988b0fed42958eddae7a10a7f
https://pubmed.ncbi.nlm.nih.gov/32225449
https://pubmed.ncbi.nlm.nih.gov/32225449
Autor:
Jérôme Faist, Filippos Kapsalidis, Mattias Beck, Mehran Shahmohammadi, Ruijun Wang, Matthew Singleton, Bo Meng
Publikováno v:
Conference on Lasers and Electro-Optics.
The effect of spatial hole burning on mode proliferation has been shown both theoretically and experimentally to be important for frequency comb operation in quantum cascade lasers (QCLs). It is therefore of great interest to investigate the frequenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a2a2df27c7bb5347d967190846f4cd0
https://doi.org/10.1364/cleo_si.2020.sth4e.2
https://doi.org/10.1364/cleo_si.2020.sth4e.2