Journal
OPTICS EXPRESS
Volume 28, Issue 20, Pages 29691-29702Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.401294
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Funding
- Engineering and Physical Sciences Research Council [EP/K037390/1, EP/M020398/1]
- China Scholarship Council [201700260049]
- EPSRC [EP/S000798/1, EP/S019367/1, EP/M013812/1, EP/P02520X/1, EP/K011987/1, EP/K037390/1, EP/M020398/1] Funding Source: UKRI
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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. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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