Proposal for a room-temperature diamond maser

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作者
Liang Jin
Matthias Pfender
Nabeel Aslam
Philipp Neumann
Sen Yang
Jörg Wrachtrup
Ren-Bao Liu
机构
[1] The Chinese University of Hong Kong,Department of Physics and Centre for Quantum Coherence
[2] Shatin,undefined
[3] New Territories,undefined
[4] Hong Kong,undefined
[5] China,undefined
[6] 3rd Institute of Physics,undefined
[7] University of Stuttgart,undefined
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摘要
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 <10 W). A room-temperature diamond maser may facilitate a broad range of microwave technologies.
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