Enhanced magnetic Purcell effect in room-temperature masers.

Nature communications (2015-02-24)
Jonathan Breeze, Ke-Jie Tan, Benjamin Richards, Juna Sathian, Mark Oxborrow, Neil McN Alford

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.

Product Number
Product Description

p-Terphenyl, ≥99.5% (HPLC)
Pentacene, 99%
3,3′-Diiodo-L-thyronine (T2) hydrochloride, 98% (CP)
p-Terphenyl, suitable for scintillation, ≥98.5% (HPLC)
Pentacene, triple-sublimed grade, ≥99.995% trace metals basis
p-Terphenyl, analytical standard
Pentacene, sublimed grade, ≥99.9% trace metals basis
Pentacene, for fluorescence, >95.0%

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