Zobrazeno 1 - 10
of 347
pro vyhledávání: '"Whiting, P. J."'
We demonstrate the rapid readout of terahertz (THz) orbital angular momentum (OAM) beams using an atomic-vapour based imaging technique. OAM modes with both azimuthal and radial indices are created using phase-only transmission plates. The beams unde
Externí odkaz:
http://arxiv.org/abs/2208.07273
Autor:
Downes, Lucy A., MacKellar, Andrew R., Whiting, Daniel J., Bourgenot, Cyril, Adams, Charles S., Weatherill, Kevin J.
Publikováno v:
Phys. Rev. X 10, 011027 (2020)
Terahertz (THz) technologies, generally defined as operating in the 0.1-10THz range, bridge the gap between electronic and photonic devices. Because THz radiation passes readily through materials such as plastics, paper and cloth it can be employed i
Externí odkaz:
http://arxiv.org/abs/1903.01308
Autor:
Mathew, Renju S., Ponciano-Ojeda, Francisco, Keaveney, James, Whiting, Daniel J., Hughes, Ifan G.
Publikováno v:
Optics Letters Vol. 43, Issue 17, pp. 4204-4207 (2018)
We demonstrate a technique to lock simultaneously two laser frequencies to each step of a two-photon transition in the presence of a magnetic field sufficiently large to gain access to the hyperfine Paschen-Back regime. A ladder configuration with th
Externí odkaz:
http://arxiv.org/abs/1807.00853
Publikováno v:
OSA Continuum 1(1), 4-12 (2018)
We present a simple method for producing a low-drift atomic frequency reference based upon the Zeeman effect. Our Zeeman Shifted Atomic Reference `ZSAR' is demonstrated to have tens of GHz tuning range, limited only by the strength of the applied fie
Externí odkaz:
http://arxiv.org/abs/1804.07928
Publikováno v:
Journal of Modern Optics, Volume 65, 2018 - Issue 2, Pages 119-128
We present an experimental study of seeded four-wave mixing (4WM) using a diamond excitation scheme (with states from the 5S$_{1/2}$, 5P$_{1/2}$, 5P$_{3/2}$ and 5D$_{3/2}$ terms) in a thermal vapour of $^{87}$Rb atoms. We investigate the 4WM spectra
Externí odkaz:
http://arxiv.org/abs/1705.01855
Publikováno v:
Phys. Rev. Lett. 118, 253601 (2017)
We experimentally demonstrate the generation of heralded bi-chromatic single photons from an atomic collective spin excitation (CSE). The photon arrival times display collective quantum beats, a novel interference effect resulting from the relative m
Externí odkaz:
http://arxiv.org/abs/1612.05467
Publikováno v:
Phys. Rev. A 93, 043854 (2016)
Applying large magnetic fields to gain access to the hyperfine Paschen-Back regime can isolate three-level systems in a hot alkali metal vapors, thereby simplifying usually complex atom-light interactions. We use this method to make the first direct
Externí odkaz:
http://arxiv.org/abs/1602.08944
Autor:
Whiting, Daniel J., Bimbard, Erwan, Keaveney, James, Zentile, Mark A., Adams, Charles S., Hughes, Ifan G.
We investigate, theoretically and experimentally, the transmission of light through a thermal vapour of three-level ladder-type atoms, in the presence of 2 counter-propagating control fields. A simple theoretical model predicts the presence of electr
Externí odkaz:
http://arxiv.org/abs/1505.03699
Autor:
Zentile, Mark A., Mathew, Renju S., Whiting, Daniel J., Keaveney, James, Adams, Charles S., Hughes, Ifan G.
Publikováno v:
2015 J. Phys. B: At. Mol. Opt. Phys. 48, 185001
We show that homogeneous line broadening drastically affects the performance of atomic Faraday filters. We use a computerized optimization algorithm to find the best magnetic field and temperature for Faraday filters with a range of cell lengths. The
Externí odkaz:
http://arxiv.org/abs/1504.03651
Publikováno v:
Opt. Lett. Vol. 40, Issue 9, pp. 2000-2003 (2015)
We demonstrate an atomic bandpass optical filter with an equivalent noise bandwidth less than 1 GHz using the D$_1$ line in a cesium vapor. We use the ElecSus computer program to find optimal experimental parameters, and find that for important quant
Externí odkaz:
http://arxiv.org/abs/1502.07187