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35 results on '"Sathian, Juna"'

2. Continuous-wave room-temperature diamond maser

Author

Breeze, Jonathan D., Sathian, Juna, Salvadori, Enrico, Alford, Neil McN., and Kay, Christopher W. M.

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science, Quantum Physics
Abstract

The maser, older sibling of the laser, has been confined to relative obscurity due to its reliance on cryogenic refrigeration and high-vacuum systems. Despite this it has found application in deep-space communications and radio astronomy due to its unparalleled performance as a low-noise amplifier and oscillator. The recent demonstration of a room-temperature solid- state maser exploiting photo-excited triplet states in organic pentacene molecules paves the way for a new class of maser that could find applications in medicine, security and sensing, taking advantage of its sensitivity and low noise. However, to date, only pulsed operation has been observed in this system. Furthermore, organic maser molecules have poor thermal and mechanical properties, and their triplet sub-level decay rates make continuous emission challenging: alternative materials are therefore required. Therefore, inorganic materials containing spin-defects such as diamond and silicon carbide have been proposed. Here we report a continuous-wave (CW) room-temperature maser oscillator using optically pumped charged nitrogen-vacancy (NV) defect centres in diamond. This demonstration unlocks the potential of room-temperature solid-state masers for use in a new generation of microwave devices., Comment: 7 pages, 4 figures

Published
2017
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7. Continuous-wave room-temperature diamond maser

Author

Breeze, Jonathan D., Salvadori, Enrico, Sathian, Juna, Alford, Neil McN., and Kay, Christopher W. M.

Subjects
Engineering design -- Methods, Masers -- Design and construction, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Jonathan D. Breeze (corresponding author) [1, 2]; Enrico Salvadori [3, 4, 5]; Juna Sathian [1]; Neil McN. Alford [1, 2]; Christopher W. M. Kay [3, 4, 6] The maserthe [...]

Published
2018
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20. Unidirectional single-frequency operation of a continuous-wave Alexandrite ring laser with wavelength tunability

Author

Sheng, Xin, Tawy, Goronwy, Sathian, Juna, Minassian, Ara, Damzen, Michael J., and Innovate UK

Subjects
MODE-OPERATION, LIDAR, Science & Technology, F300, WATER-VAPOR, Physical Sciences, 0205 Optical Physics, 1005 Communications Technologies, 0906 Electrical And Electronic Engineering, Physics::Optics, EFFICIENT, Optics
Abstract

High resolution spectroscopy, metrology and quantum technologies (e.g. trapping and cooling) require precision laser sources with narrow linewidth and wavelength tunability. The widespread use of these lasers will be promoted if they are cost-effective, compact and efficient. Alexandrite lasers with a broad tuning band pumped efficiently by low-cost red diodes are a potential candidate, but full performance as a precision light source has not been fully achieved. We present in this work the first continuous-wave (CW) and single-frequency operation of a unidirectional diode-end-pumped Alexandrite ring laser with wavelength tunability. An ultra-compact bow-tie ring cavity is developed with astigmatic compensation and a novel ‘displaced mode’ design producing CW output power > 1 W in excellent TEM00 mode (M2 < 1.2) when using a low brightness pump (M2 ≥ 30). Wavelength tuning from 727 - 792 nm is demonstrated using a birefringent filter plate. This successful operation opens the prospects of precision light source applications.

Published
2018

28. Molecular Design of a Room-Temperature Maser

Author

Bogatko, Stuart, primary, Haynes, Peter D., additional, Sathian, Juna, additional, Wade, Jessica, additional, Kim, Ji-Seon, additional, Tan, Ke-Jie, additional, Breeze, Jonathan, additional, Salvadori, Enrico, additional, Horsfield, Andrew, additional, and Oxborrow, Mark, additional

Published
2016
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35. Tuning the upconversion photoluminescence lifetimes of NaYF4:Yb3+, Er3+ through lanthanide Gd3+ doping.

Author

Qin, Heng, Wu, Danyang, Sathian, Juna, Xie, Xiangyu, Ryan, Mary, and Xie, Fang

Abstract

The multiplexing capacity of conventional fluorescence materials are significantly limited by spectral overlap and background interference, mainly due to their short-lived fluorescence lifetimes. Here, we adopt a novel Gd3+ doping strategy in NaYF4 host materials, realized tuning of upconversion photoluminescence (UCPL) lifetimes at selective emissions. Time-correlated single-photon counting (TCSPC), was applied to measure the photoluminescence lifetimes accurately. We demonstrated the large dynamic range of lifetimes of upconversion nanoparticles with good upconversion quantum yields, mainly owing to the dominance of high efficient energy transfer upconversion mechanism. The exceptional tunable properties of upconversion materials allow great potential for them to be utilized in biotechnology and life sciences. [ABSTRACT FROM AUTHOR]

Published
2018
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