Results 31 to 40 of about 34,043 (308)

Fault-tolerant H ∞ control for optical parametric oscillators with pumping fluctuations

, 2022
Optical Parametric Oscillators (OPOs) have wide applications in quantum optics for generating squeezed states and developing advanced technologies. When the phase or/and the amplitude of the pumping field for an OPO have fluctuations due to fault signals,
Yonezawa, Hidehiro, Petersen, Ian R, Dong, Daoyi, Liu, Yanan   +3 more
core   +1 more source

Observations of artificial and natural optical emissions at the HAARP facility [PDF]

, 2008
Extensive optical observations have been carried out at the High Frequency Active Auroral Research Program (HAARP) ionospheric heating facility since it began operations in 1999.
T. Pedersen, Kendall, E., Esposito, R., Marshall, R., Kosch, M., Pedersen, T., R. Esposito, Mishin, E., R. Marshall, D. Sentman, E. Kendall, M. Kosch, Sentman, D., E. Mishin   +13 more
core   +1 more source

The electron energy distribution during HF pumping, a picture painted with all colors [PDF]

, 2005
International audienceThe shape of the electron energy distribution has long been a central question in the field of high-frequency radio-induced optical emission experiments.
Rietveld, Michael T., Kosch, M.J., H. Holma, Aso, T., Grydeland, T., K. Kaila, P. Gallop, Gustavsson, B., Leyser, T.B., M. T. Rietveld, B. Isham, B. U. E. Brändström, Kaila, K., J. Jussila, Å. Steen, Steen, Å., Leyser, T. B., LaHoz, C., T. B. Leyser, Grydeland, Tom, Isham, B., Brändström, B.U.E., C. LaHoz, M. Ejiri, Sergienko, T., Rietveld, M. T., Ejiri, M., B. Gustavsson, Kosch, M. J., Gallop, P., M. J. Kosch, T. Aso, Brändström, B. U. E., La Hoz, Cesar, Jussila, J., Holma, H., T. Grydeland, T. Sergienko   +37 more
core   +1 more source

The polarization and the fundamental sensitivity of 39K (133Cs)-85Rb-4He hybrid optical pumping spin exchange relaxation free atomic magnetometers

Scientific Reports, 2017
The hybrid optical pumping spin exchange relaxation free (SERF) atomic magnetometers can realize ultrahigh sensitivity measurement of magnetic field and inertia.
Jian-Hua Liu, Dong-Yang Jing, Liang-Liang Wang, Yang Li, Wei Quan, Jian-Cheng Fang, Wu-Ming Liu   +6 more
doaj   +1 more source

Artificial optical emissions at HAARP for pump frequencies near the third and second electron gyro-harmonic [PDF]

, 2005
International audienceHigh-power high-frequency radio waves beamed into the ionosphere cause plasma turbulence, which can accelerate electrons. These electrons collide with the F-layer neutral oxygen causing artificial optical emissions identical to ...
F. T. Djuth, T. Pedersen, A. Senior, Hughes, J., Gerken, E., E. Gerken, Marshall, R., Pedersen, T., Senior, A., McCarrick, M., R. Marshall, Djuth, F. T., Kosch, M. J., M. J. Kosch, D. Sentman, J. Hughes, M. McCarrick, Sentman, D.   +17 more
core   +1 more source

An optically driven pump for microfluidics

SPIE Proceedings, 2006
We demonstrate a method for generating flow within a microfluidic channel using an optically driven pump. The pump consists of two counter rotating birefringent vaterite particles trapped within a microfluidic channel and driven using optical tweezers. The transfer of spin angular momentum from a circularly polarised laser beam rotates the particles at
Leach, Jonathan, Mushfique, Hasan, Di Leonardo, Roberto, Padgett, Miles, Cooper, Jon   +4 more
openaire   +5 more sources

Efficient optical pumping using hyperfine levels in 145Nd3+:Y2SiO5 and its application to optical storage

New Journal of Physics, 2018
Efficient optical pumping is an important tool for state initialization in quantum technologies, such as optical quantum memories. In crystals doped with Kramers rare-earth ions, such as erbium and neodymium, efficient optical pumping is challenging due ...
Emmanuel Zambrini Cruzeiro, Alexey Tiranov, Jonathan Lavoie, Alban Ferrier, Philippe Goldner, Nicolas Gisin, Mikael Afzelius   +6 more
doaj   +1 more source

Numerical analysis of the optical pumping process coupled with 23Na D2 manifold modeled as a partially resolved hyperfine structure

AIP Advances, 2020
All magnetometers using alkali atoms rely on the monochromatic light driving the optical pumping process in the D1 or D2 line to create spin-polarized atoms.
Xiaoxu Zhang, Xingqiao Ma, Yiping Chen, Qiongying Ren, Hua Zhao   +4 more
doaj   +1 more source

Performance of a photothermal detector with turbid liquids [PDF]

, 2005
A closed-cell photothermal detector for aqueous analytes has been evaluated at 254nm and 678nm. The detector used a water meniscus as a pressure sensor, whose periodic deflection was measured using a low finesse optical fibre Fabry-Perot interferometer.
Johnson, Mark, Hodgkinson, Jane, Dakin, John P.   +2 more
core   +1 more source

Spin polarization of 87Rb atoms with Xe gas and high-pressure buffer gas in a cubic cell

AIP Advances, 2019
We simulated the optical pumping rate of 87Rb atoms with Xe and high-pressure buffer gas in a cubic cell. We calculated absorption cross-section as a function of pumping laser frequency by considering a pressure and Doppler broadening as gas temperature ...
Hoon Yu, Jai Seung Yoo
doaj   +1 more source