Open AccessInvasive optical pumping for room-temperature masers, time-resolved EPR, triplet-DNP, and quantum engines exploiting strong coupling
Author(s) -
Hao Wu,
Shamil Mirkhanov,
Wern Ng,
Kuan-Cheng Chen,
Yuling Xiong,
M. Oxborrow
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.401294
Subject(s) - materials science , optics , pentacene , electron paramagnetic resonance , optical pumping , maser , optoelectronics , coupling (piping) , atomic physics , laser , physics , nuclear magnetic resonance , layer (electronics) , metallurgy , composite material , thin film transistor
We explore an approach for optically pumping a body of optically dense magnetic material. This challenge arises in time-resolved electron paramagnetic resonance (TREPR), triplet-based dynamic nuclear polarisation (DNP), and cavity QED. Crystals of pentacene-doped p-terphenyl were grown around variously shaped ends of optical waveguides, through which pump light could be injected deeply into the crystal. When incorporated into a maser as the gain medium, we found that, compared to conventional side-pumping, 11 times less pump beam intensity was needed to reach the masing threshold and 54 times more pulse energy could be absorbed by the gain medium without damage, resulting in a record peak output power of -5 dBm.