Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Jesper B. Christensen"'
Autor:
Benjamin Lundquist Thomsen, Jesper B. Christensen, Olga Rodenko, Iskander Usenov, Rasmus Birkholm Grønnemose, Thomas Emil Andersen, Mikael Lassen
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022)
Abstract The worldwide increase of antimicrobial resistance (AMR) is a serious threat to human health. To avert the spread of AMR, fast reliable diagnostics tools that facilitate optimal antibiotic stewardship are an unmet need. In this regard, Raman
Externí odkaz:
https://doaj.org/article/87193caef5994f92993e18f173c9d451
Autor:
Andreas N. Rasmussen, Benjamin L. Thomsen, Jesper B. Christensen, Jan C. Petersen, Mikael Lassen
Publikováno v:
Sensors, Vol 23, Iss 18, p 7984 (2023)
We report on the use of quartz-enhanced photoacoustic spectroscopy (QEPAS) for multi-gas detection. Photoacoustic (PA) spectra of mixtures of water (H2O), ammonia (NH3), and methane (CH4) were measured in the mid-infrared (MIR) wavelength range using
Externí odkaz:
https://doaj.org/article/9756b746cefa4004ba33a13ec25625fe
Publikováno v:
Molecules, Vol 26, Iss 3, p 609 (2021)
We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the ampl
Externí odkaz:
https://doaj.org/article/c8cef0b802a743e89933f3695c530edf
Autor:
Jesper B. Christensen, Lasse Høgstedt, Søren M. M. Friis, Jui-Yu Lai, Ming-Hsien Chou, David Balslev-Harder, Jan C. Petersen, Mikael Lassen
Publikováno v:
Sensors, Vol 20, Iss 17, p 4725 (2020)
Quartz-enhanced photoacoustic sensing is a promising method for low-concentration trace-gas monitoring due to the resonant signal enhancement provided by a high-Q quartz tuning fork. However, quartz-enhanced photoacoustic spectroscopy (QEPAS) is asso
Externí odkaz:
https://doaj.org/article/fb9514ec177e4aab984a2f474ad86574
Publikováno v:
Applied optics. 60(10)
There is a great need for cost-efficient non-invasive medical diagnostic tools for analyzing humanly exhaled air. Compared to present day methods, photoacoustic spectroscopy (PAS) can provide a compact and portable (bedside), sensitive and inexpensiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c96f1c94ae6fa22cd7d5e48b090c0fe
https://pubmed.ncbi.nlm.nih.gov/33798172
https://pubmed.ncbi.nlm.nih.gov/33798172
Autor:
Jesper B. Christensen, Kai Wang, Jie Zhang, Ilaria Vagniluca, Davide Bacco, Alessandro Zavatta, Soren Forchhammer
Publikováno v:
Wang, K, Vagniluca, I, Zhang, J, Forchhammer, S, Zavatta, A, Christensen, J B & Bacco, D 2021, ' Round-Robin Differential Phase-Time-Shifting Protocol for Quantum Key Distribution : Theory and Experiment ', Physical Review Applied, vol. 15, no. 4, 044017 . https://doi.org/10.1103/PhysRevApplied.15.044017
Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Many of the QKD protocols that were introduced in the past involve the challenge of monitoring the signal disturbance over the communication l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a2564324562d7c600c3bc476ca6c541
https://orbit.dtu.dk/en/publications/ef69eb03-937b-48e4-968f-804a290f3a3f
https://orbit.dtu.dk/en/publications/ef69eb03-937b-48e4-968f-804a290f3a3f
Autor:
David Balslev-Harder, Jan C. Petersen, Mikael Lassen, Lars Henrik Nielsen, Jesper B. Christensen
Publikováno v:
Molecules
Volume 26
Issue 3
Molecules, Vol 26, Iss 609, p 609 (2021)
Volume 26
Issue 3
Molecules, Vol 26, Iss 609, p 609 (2021)
We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the ampl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac3281bf5ef37f28e421a5ba5bee42e9
Autor:
Jesper B. Christensen, Mikael Lassen, Eugene S. Polzik, Hugo Kerdoncuff, Jan Hald, Túlio B. Brasil, Valeriy A. Novikov
Publikováno v:
Optics Express
Kerdoncuff, H, Christensen, J B, Brasil, T B, Novikov, V A, Polzik, E S, Hald, J & Lassen, M 2020, ' Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency ', Optics Express, vol. 28, no. 3, pp. 3975-3984 . https://doi.org/10.1364/OE.385826
Kerdoncuff, H, Christensen, J B, Brasil, T B, Novikov, V A, Polzik, E S, Hald, J & Lassen, M 2020, ' Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency ', Optics Express, vol. 28, no. 3, pp. 3975-3984 . https://doi.org/10.1364/OE.385826
We report on double-resonant highly efficient sum-frequency generation in the blue range. The system consists of a 10-mm-long periodically poled KTP crystal placed in a double-resonant bow-tie cavity and pumped by a fiber laser at 1064.5 nm and a Ti:
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::657360147bd0c50e7673d5c186e23f8e
http://arxiv.org/abs/2002.05491
http://arxiv.org/abs/2002.05491
Double-Resonant Sum-Frequency Generation of Blue Light with Near-Unity Quantum Conversion Efficiency
Autor:
Tulio B. Brasil, Jan Hald, Jesper B. Christensen, Eugene S. Polzik, Mikael Lassen, Hugo Kerdoncuff, Valeriy A. Novikov
Publikováno v:
Conference on Lasers and Electro-Optics.
We demonstrate double-resonant sum-frequency generation of coherent blue light in a bow-tie cavity with record high quantum conversion efficiency of 95% of mode-matched nearinfrared photons and a high output beam quality.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b7449f89f10f9b97801206d7cdcd00a
https://doi.org/10.1364/cleo_at.2020.jtu2f.34
https://doi.org/10.1364/cleo_at.2020.jtu2f.34
Autor:
Xiaodong Shi, Erik Christensen, Karsten Rottwitt, Haiyan Ou, Li Lin, Jesper B. Christensen, Kai Guo, Yunhong Ding
Publikováno v:
IEEE Photonics Journal, Vol 10, Iss 1, Pp 1-8 (2018)
Guo, K, Christensen, J B, Shi, X, Christensen, E N, Lin, L, Ding, Y, Ou, H & Rottwitt, K 2018, ' Experimentally validated dispersion tailoring in a silicon strip waveguide with alumina thin-film coating ', IEEE Photonics Journal, vol. 10, no. 2, 6600508 . https://doi.org/10.1109/JPHOT.2018.2802931
Guo, K, Christensen, J B, Shi, X, Christensen, E N, Lin, L, Ding, Y, Ou, H & Rottwitt, K 2018, ' Experimentally validated dispersion tailoring in a silicon strip waveguide with alumina thin-film coating ', IEEE Photonics Journal, vol. 10, no. 2, 6600508 . https://doi.org/10.1109/JPHOT.2018.2802931
We propose a silicon strip waveguide structure with alumina thin-film coating in-between the core and the cladding for group-velocity dispersion tailoring. By carefully designing the core dimension and the coating thickness, a spectrally-flattened ne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::454d51f4df969920cf6f39d93d189c3f
https://ieeexplore.ieee.org/document/8283601/
https://ieeexplore.ieee.org/document/8283601/