Proposal for a room-temperature diamond maser

Liang Jin, Matthias Pfender, Nabeel Aslam, Philipp Neumann, Sen Yang, Jörg Wrachtrup and Ren-Bao Liu ()
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Liang Jin: The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
Matthias Pfender: 3rd Institute of Physics, University of Stuttgart
Nabeel Aslam: 3rd Institute of Physics, University of Stuttgart
Philipp Neumann: 3rd Institute of Physics, University of Stuttgart
Sen Yang: 3rd Institute of Physics, University of Stuttgart
Jörg Wrachtrup: 3rd Institute of Physics, University of Stuttgart
Ren-Bao Liu: The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract The application of masers is limited by its demanding working conditions (high vacuum or low temperature). A room-temperature solid-state maser is highly desirable, but the lifetimes of emitters (electron spins) in solids at room temperature are usually too short (∼ns) for population inversion. Masing from pentacene spins in p-terphenyl crystals, which have a long spin lifetime (∼0.1 ms), has been demonstrated. This maser, however, operates only in the pulsed mode. Here we propose a room-temperature maser based on nitrogen-vacancy centres in diamond, which features the longest known solid-state spin lifetime (∼5 ms) at room temperature, high optical pumping efficiency (∼106 s−1) and material stability. Our numerical simulation demonstrates that a maser with a coherence time of approximately minutes is feasible under readily accessible conditions (cavity Q-factor ∼5 × 104, diamond size ∼3 × 3 × 0.5 mm3 and pump power

Date: 2015
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DOI: 10.1038/ncomms9251

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