Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Jeff Demas"'
Autor:
Hyewon Kim, Frank Tejera, Jeff Demas, Kevin Barber, Brandon Chen, Francisca Martínez Traub, Jason Manley, Alipasha Vaziri
Publikováno v:
Nat Methods
Two-photon microscopy has enabled high-resolution imaging of neuroactivity at depth within scattering brain tissue. However, its various realizations have not overcome the tradeoffs between speed and spatiotemporal sampling that would be necessary to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24ccc8fbc5931af556a6ed88c1c47269
https://doi.org/10.1038/s41592-021-01239-8
https://doi.org/10.1038/s41592-021-01239-8
Autor:
Jason Manley, Frank Tejera, Brandon Chen, Jeff Demas, Alipasha Vaziri, Hyewon Kim, Francisca Martínez Traub
Two-photon microscopy together with genetically encodable calcium indicators has emerged as a standard tool for high-resolution imaging of neuroactivity in scattering brain tissue. However, its various realizations have not overcome the inherent trad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4390647678193274e9b3b492de692eef
https://doi.org/10.1101/2021.02.21.432164
https://doi.org/10.1101/2021.02.21.432164
Autor:
Johan Nilsson, Sheng Zhu, Seongwoo Yoo, Raghuraman Sidharthan, Yutong Feng, Siddharth Ramachandran, Shankar Pidishety, Soonki Hong, Jeff Demas, Balaji Srinivasan
We report the first demonstration of Raman amplification in a fiber of a single Bessel-like higher order mode using a multimode pump source. We amplify the LP08-mode with a 559-µm2 effective mode area at a signal wavelength of 1115 nm in a pure-sili
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe754d36a1e09502575abbdcf8d6abae
https://eprints.soton.ac.uk/423368/
https://eprints.soton.ac.uk/423368/
Publikováno v:
Optics letters. 42(13)
Dispersion control is a critical functionality required in systems involving ultra-short (∼100 fs) pulses, and we demonstrate the use of chirped long-period fiber gratings for this purpose. The operation principles of this device share many attribu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e337c00f2d417fb6a9e822e8ab03fe1
https://pubmed.ncbi.nlm.nih.gov/28957277
https://pubmed.ncbi.nlm.nih.gov/28957277
Publikováno v:
Conference on Lasers and Electro-Optics.
We demonstrate a novel intermodal four-wave mixing process by dividing a pump at 1047nm between the LP 0,4 and LP 0,5 fiber modes, leading to simultaneously broadband (28nm at 1550nm) and wideband (∼1 octave) spontaneous parametric gain.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4bb6aadceea7e48d37ee8b63aa34b862
https://doi.org/10.1364/cleo_si.2017.sm3m.1
https://doi.org/10.1364/cleo_si.2017.sm3m.1
Publikováno v:
Conference on Lasers and Electro-Optics.
We seed a unique, broad-gain-bandwidth (60nm at 1550nm) intermodal four-wave mixing process yielding 10kW-peak-power pulses tunable from 786–795nm, resulting in the first power-scalable all-fiber tunable source in the spectral range of the ubiquito
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46c22ac3057732dbe8659ed2f904fdb9
https://doi.org/10.1364/cleo_at.2017.jth5a.8
https://doi.org/10.1364/cleo_at.2017.jth5a.8
Autor:
Siegfried Weisenburger, Fraser T. Sparks, Tanya L. Daigle, Jason Manley, Francisca Martínez Traub, Alipasha Vaziri, Brandon Chen, Frank Tejera, Hongkui Zeng, Attila Losonczy, Jeff Demas
Publikováno v:
Cell. 177:1050-1066.e14
Calcium imaging using two-photon scanning microscopy has become an essential tool in neuroscience. However, in its typical implementation, the tradeoffs between fields of view, acquisition speeds, and depth restrictions in scattering brain tissue pos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::388a875c8084eb218ce46f07dad0426d
https://doi.org/10.1016/j.cell.2019.03.011
https://doi.org/10.1016/j.cell.2019.03.011
Autor:
Lars Rishoj, Siddharth Ramachandran, John Ballato, Patrick Gregg, Maxwell Jones, Jeff Demas, Gautam Prabhakar, Lu Yan, Thomas Hawkins
We demonstrate higher-order-mode (Aeff up to ∼2000 μm2) propagation in a 100 μm outer diameter pure-silica fiber with a low-index polymer jacket commonly used for fiber laser pump guidance. This simple structure obviates the need for complex desi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aafc66557c43329fad55ea91d5a0931e
https://europepmc.org/articles/PMC4968697/
https://europepmc.org/articles/PMC4968697/
Publikováno v:
Lasers Congress 2016 (ASSL, LSC, LAC).
We utilize four-wave mixing in the LP0,7 mode of a multi-mode fiber to achieve spatially coherent monomode 16-kW peak-power pulses at 974nm, of interest for realizing power-scalable, compact blue lasers in a monolithic fiber geometry.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ffa2a9d68b6173a48602476eb643a376
https://doi.org/10.1364/assl.2016.atu6a.2
https://doi.org/10.1364/assl.2016.atu6a.2
Publikováno v:
Conference on Lasers and Electro-Optics.
We amplify a seed laser at 880 nm to achieve 385 ps pulses with 10 kW peak power in a commercial step-index multimode fiber using four-wave mixing pumped at 1064 nm in a large effective area LP 0,6 mode.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9501690dff32b3c01d3bc18785a7c33f
https://doi.org/10.1364/cleo_si.2016.sth3p.6
https://doi.org/10.1364/cleo_si.2016.sth3p.6