Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Reshma A. Mohandas"'
Autor:
James Keeley, Joshua Freeman, Karl Bertling, Yah Leng Lim, Reshma A. Mohandas, Thomas Taimre, Lianhe H. Li, Dragan Indjin, Aleksandar D. Rakić, Edmund H. Linfield, A. Giles Davies, Paul Dean
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
Abstract The effects of optical feedback (OF) in lasers have been observed since the early days of laser development. While OF can result in undesirable and unpredictable operation in laser systems, it can also cause measurable perturbations to the o
Externí odkaz:
https://doaj.org/article/ecda9f8dc1b540f7bd7e36d99daa0d79
Autor:
Paul Dean, Lianhe Li, Edmund H. Linfield, A. Giles Davies, Reshma A. Mohandas, Lalitha Ponnampalam, Alwyn J. Seeds, Joshua R. Freeman
The accuracy of high-resolution spectroscopy depends critically on the stability, frequency control, and traceability available from laser sources. In this work, we report exact tunable frequency synthesis and phase control of a terahertz laser. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6135ce4028a2afc675e7366137f03d3
https://eprints.whiterose.ac.uk/163236/8/optica-7-9-1143.pdf
https://eprints.whiterose.ac.uk/163236/8/optica-7-9-1143.pdf
Autor:
Lalitha Ponnampalam, A. Giles Davies, Joshua R. Freeman, Cyril C. Renaud, Reshma A. Mohandas, Martyn J. Fice, Edmund H. Linfield, Alwyn J. Seeds
Publikováno v:
2019 International Topical Meeting on Microwave Photonics (MWP).
We present a highly coherent tunable THz source based on an optical frequency comb generator with frequencies referenced to primary frequency standards. The THz synthesizer is continuously tunable from 122.5 GHz to greater than 2.7 THz, with a spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b624208ec97c87f77e8fa21cc343e83
https://doi.org/10.1109/mwp.2019.8892129
https://doi.org/10.1109/mwp.2019.8892129
Autor:
Lalitha Ponnampalam, Paul Dean, Joshua R. Freeman, A. Giles Davies, Reshma A. Mohandas, Alwyn J. Seeds, Edmund H. Linfield
Publikováno v:
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We report on the high-resolution frequency and phase control of a terahertz (THz) quantum cascade laser (QCL). The 2.0 THz QCL is locked to a stable microwave reference frequency via an all-fibre infrared frequency comb. The frequency of the QCL is c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0e913187313a17b57a7c1998123b435d
https://doi.org/10.1109/irmmw-thz.2019.8873906
https://doi.org/10.1109/irmmw-thz.2019.8873906
Autor:
Reshma A, Mohandas, Joshua R, Freeman, Michele, Natrella, Mark C, Rosamond, Lalitha, Ponnampalam, Martyn J, Fice, Alwyn J, Seeds, Paul J, Cannard, Michael J, Robertson, David G, Moodie, A Giles, Davies, Edmund H, Linfield, Paul, Dean
Publikováno v:
Optics express. 25(9)
We report the generation mechanism associated with nano-grating electrode photomixers fabricated on Fe-doped InGaAsP substrates. Two different emitter designs incorporating nano-gratings coupled to the same broadband antenna were characterized in a c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::9a79931551efd9b1be3b30caa2f06783
https://pubmed.ncbi.nlm.nih.gov/28468392
https://pubmed.ncbi.nlm.nih.gov/28468392
Autor:
D.G. Moodie, A. Giles Davies, Reshma A. Mohandas, Lalitha Ponnampalam, Paul Dean, Alwyn J. Seeds, Michael J. Robertson, Mark C. Rosamond, Joshua R. Freeman, Edmund H. Linfield, P. J. Canard
Publikováno v:
2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz).
The emission mechanism of continuous wave (CW) terahertz (THz) photomixers that make use of nanostructured gratings (NSGs) is studied. Two different photomixer designs, based on a single-sided NSG and a double-sided NSG, embedded in the same antenna
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85329717789a26120f7d26d6c755a0ba
https://doi.org/10.1109/irmmw-thz.2016.7758713
https://doi.org/10.1109/irmmw-thz.2016.7758713
Autor:
Edmund H. Linfield, A. Giles Davies, Paul Dean, Lianhe Li, David R. Bacon, Reshma A. Mohandas, Joshua R. Freeman
Publikováno v:
2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz).
The gain recovery time of a bound-to-continuum terahertz frequency quantum cascade laser, operating at 1.98 THz, has been measured using broadband terahertz-pump-terahertz-probe spectroscopy. The recovery time is found to reduce as a function of curr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a7e6b75c6b3bd2702a59dded08f79ac
https://doi.org/10.1109/irmmw-thz.2016.7758562
https://doi.org/10.1109/irmmw-thz.2016.7758562
Autor:
Reshma A. Mohandas, Joshua R. Freeman, Edmund H. Linfield, Paul Dean, Lianhe Li, David R. Bacon, A. Giles Davies
The gain recovery time of a bound-to-continuum terahertz frequency quantum cascade laser, operating at 1.98 THz, has been measured using broadband terahertz-pump-terahertz-probe spectroscopy. The recovery time is found to reduce as a function of curr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f61926bc0806cfacae0861bb303a8311
Autor:
Joshua R. Freeman, Paul Dean, Lianhe Li, Edmund H. Linfield, Dragan Indjin, Karl Bertling, Thomas Taimre, Yah Leng Lim, Aleksandar D. Rakić, A. Giles Davies, Reshma A. Mohandas, James Keeley
Publikováno v:
Scientific Reports, Vol 8, Iss 1, Pp 1-1 (2018)
Scientific Reports
Scientific Reports
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3558336e256b846fdaae29e4dd5d548
http://link.springer.com/article/10.1038/s41598-018-36015-w
http://link.springer.com/article/10.1038/s41598-018-36015-w
Autor:
Negar Hekmat, Paul Dean, Lianhe Li, A. Giles Davies, Hanond Nong, Nathan Jukam, Shovon Pal, Andreas D. Wieck, Sergej Markmann, Reshma A. Mohandas, Edmund H. Linfield
Publikováno v:
2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz).
The dynamic response of a terahertz quantum cascade laser is probed as a function of time. The gain of the THz QCL is saturated by injection seeding the laser with an initial THz seed pulse. The time-resolved gain of the injection seeded laser is the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13696c9f4a6012df2d73c193b222ea1d
https://doi.org/10.1109/irmmw-thz.2015.7327688
https://doi.org/10.1109/irmmw-thz.2015.7327688