Enhanced magnetic Purcell effect in room-temperature masers

Jonathan Breeze (), Ke-Jie Tan, Benjamin Richards, Juna Sathian, Mark Oxborrow and Neil McN Alford
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Jonathan Breeze: Imperial College London, Royal School of Mines
Ke-Jie Tan: Imperial College London, Royal School of Mines
Benjamin Richards: Imperial College London, Royal School of Mines
Juna Sathian: Imperial College London, Royal School of Mines
Mark Oxborrow: Imperial College London, Royal School of Mines
Neil McN Alford: Imperial College London, Royal School of Mines

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

Abstract: Abstract Recently, the world’s first room-temperature maser was demonstrated. The maser consisted of a sapphire ring housing a crystal of pentacene-doped p-terphenyl, pumped by a pulsed rhodamine-dye laser. Stimulated emission of microwaves was aided by the high quality factor and small magnetic mode volume of the maser cavity yet the peak optical pumping power was 1.4 kW. Here we report dramatic miniaturization and 2 orders of magnitude reduction in optical pumping power for a room-temperature maser by coupling a strontium titanate resonator with the spin-polarized population inversion provided by triplet states in an optically excited pentacene-doped p-terphenyl crystal. We observe maser emission in a thimble-sized resonator using a xenon flash lamp as an optical pump source with peak optical power of 70 W. This is a significant step towards the goal of continuous maser operation.

Date: 2015
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DOI: 10.1038/ncomms7215

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