Enhanced magnetic Purcell effect in room-temperature masers

Jonathan Breeze; Ke-Jie Tan; Benjamin Richards; Juna Sathian; Mark Oxborrow; Neil McN. Alford

doi:10.1038/ncomms7215

Enhanced magnetic Purcell effect in room-temperature masers

Jonathan Breeze, Ke-Jie Tan, Benjamin Richards, Juna Sathian, Mark Oxborrow, Neil McN. Alford

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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.

Original language	English
Article number	6215
Journal	Nature Communications
Volume	6
Early online date	20 Feb 2015
DOIs	https://doi.org/10.1038/ncomms7215
Publication status	Published - May 2019
Externally published	Yes

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title = "Enhanced magnetic Purcell effect in room-temperature masers",

abstract = "Recently, the world{\textquoteright}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.",

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AU - Breeze, Jonathan

AU - Tan, Ke-Jie

AU - Richards, Benjamin

AU - Sathian, Juna

AU - Oxborrow, Mark

AU - Alford, Neil McN.

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Enhanced magnetic Purcell effect in room-temperature masers

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