Zobrazeno 1 - 10
of 39
pro vyhledávání: '"John E. Beetar"'
Autor:
Yangyang Liu, Gyanendra Dhakal, Anup Pradhan Sakhya, John E. Beetar, Firoza Kabir, Sabin Regmi, Dariusz Kaczorowski, Michael Chini, Benjamin M. Fregoso, Madhab Neupane
Publikováno v:
Communications Physics, Vol 5, Iss 1, Pp 1-6 (2022)
Topological nodal line semimetals are characterised by band crossings along a line, or closed loop inside, of the Brillouin zone and belong to a larger family of topological semimetals. Here, using time-resolved angle resolved photoemission spectrosc
Externí odkaz:
https://doaj.org/article/60668db5ba3b444bb49848f0caecab7e
Autor:
Firoza Kabir, M. Mofazzel Hosen, Xiaxin Ding, Christopher Lane, Gyanendra Dhakal, Yangyang Liu, Klauss Dimitri, Christopher Sims, Sabin Regmi, Anup Pradhan Sakhya, Luis Persaud, John E. Beetar, Yong Liu, Michael Chini, Arjun K. Pathak, Jian-Xin Zhu, Krzysztof Gofryk, Madhab Neupane
Publikováno v:
Frontiers in Materials, Vol 8 (2021)
Three-dimensional (3D) topological insulator (TI) has emerged as a unique state of quantum matter and generated enormous interests in condensed matter physics. The surfaces of a 3D TI consist of a massless Dirac cone, which is characterized by the Z2
Externí odkaz:
https://doaj.org/article/0565465dd343402b9ce27033868fdae5
Publikováno v:
Optics Letters. 48:2397
Few-cycle, long-wavelength sources for generating isolated attosecond soft x ray pulses typically rely upon complex laser architectures. Here, we demonstrate a comparatively simple setup for generating sub-two-cycle pulses in the short-wave infrared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8b0f3d8945ba72f757e07f24510bf04
https://doi.org/10.1364/ol.487607
https://doi.org/10.1364/ol.487607
Publikováno v:
Progress in Optics ISBN: 9780323989053
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0975cb00c31133d8cedfc519af95b742
https://doi.org/10.1016/bs.po.2022.01.002
https://doi.org/10.1016/bs.po.2022.01.002
Autor:
John E. Beetar, Michael Chini
Publikováno v:
Nature Photonics. 15:249-251
Four-wave mixing near atomic resonances offers new opportunities for spectral control of extreme ultraviolet pulses.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b9951cf163e69b28813a8fdd8234ad7
https://doi.org/10.1038/s41566-021-00784-0
https://doi.org/10.1038/s41566-021-00784-0
Autor:
Ahmed Yousif, Shima Gholam-Mirzaei, M. Nrisimhamurty, Michael Chini, John E. Beetar, Jonathan Nesper, Yangyang Liu
Publikováno v:
Conference on Lasers and Electro-Optics.
We demonstrate that tunneling and multiphoton excitation in a dielectric solid can provide an ultrafast temporal “gate” for characterizing high-energy, few-cycle waveforms. Using this technique, near- and mid-infrared pulses are measured.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc15d48c656d298085b3df31ba9ecdb3
https://doi.org/10.1364/cleo_si.2021.sw3j.5
https://doi.org/10.1364/cleo_si.2021.sw3j.5
Autor:
Yangyang Liu, Tran-Chau Truong, Garima C. Nagar, John E. Beetar, Federico Rivas, Yi Wu, Omar Suarez, Michael Chini, M. Nrisimhamurty, Jonathan Nesper, Bonggu Shim
Publikováno v:
Science Advances
Molecular gases enable extreme compression of industrial-grade lasers, providing a more accessible platform for attosecond science.
The field of attosecond science was first enabled by nonlinear compression of intense laser pulses to a duration
The field of attosecond science was first enabled by nonlinear compression of intense laser pulses to a duration
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d29bf8db6289f380f95add890cb49433
https://pubmed.ncbi.nlm.nih.gov/32937367
https://pubmed.ncbi.nlm.nih.gov/32937367
Autor:
Yong Liu, Marc B. Etienne, Sabin Regmi, Klauss Dimitri, Gyanendra Dhakal, John E. Beetar, Dariusz Kaczorowski, Firoza Kabir, M. Mofazzel Hosen, Madhab Neupane, Yangyang Liu, Arjun K. Pathak, Michael Chini, Christopher Sims
Publikováno v:
The Review of scientific instruments. 91(1)
Characterizing and controlling electronic properties of quantum materials require direct measurements of non-equilibrium electronic band structures over large regions of momentum space. Here, we demonstrate an experimental apparatus for time- and ang
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c1b0162ddb2e60e71b98599172589ff
https://pubmed.ncbi.nlm.nih.gov/32012559
https://pubmed.ncbi.nlm.nih.gov/32012559
Autor:
John E. Beetar, Bonggu Shim, Garima C. Nagar, Tran-Chau Truong, Yi Wu, M. Nrisimhamurty, Michael Chini
Publikováno v:
Conference on Lasers and Electro-Optics.
The delayed optical nonlinearity of molecules is harnessed to generate a multi-octave supercontinuum and compress 280 fs pulses from a commercial Yb:KGW laser amplifier to sub-two cycle duration using an N2O filled hollow-core fiber.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d7f84a66a8d618995a56b522cd2be7f
https://doi.org/10.1364/cleo_si.2020.sm2h.2
https://doi.org/10.1364/cleo_si.2020.sm2h.2
Publikováno v:
Conference on Lasers and Electro-Optics.
Molecular gas-filled hollow-core fibers are attractive for pulse compression of Yb lasers. Here, we show that rotational heating prevents efficient spectral broadening at high average powers and find that buffer-gas cooling can mitigate this effect.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9af4f1cfb5d9f1f6b6a2c303b664a58b
https://doi.org/10.1364/cleo_si.2020.sw3h.2
https://doi.org/10.1364/cleo_si.2020.sw3h.2