2022
DOI: 10.1063/5.0079219
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Multi-line lasing in the broadly tunable ammonia quantum cascade laser pumped molecular laser

Abstract: Gaseous ammonia has previously been demonstrated as a compelling gain medium for a quantum cascade laser pumped molecular laser (QPML) exhibiting good power efficiency. Here, we explore the potential of the ammonia QPML to produce powerful, broadly tunable terahertz frequency lasing on rotational and pure inversion transitions. After theoretically predicting possible laser frequencies, pump thresholds, and efficiencies, we experimentally demonstrate unprecedented tunability—from 0.763 to 4.459 THz—by pumping Q… Show more

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Cited by 8 publications
(4 citation statements)
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“…We have additionally observed weakly enhanced absorption and amplification signals from rotational transitions respectively farther above and below the pumped transitions, obtained by a mechanism similar to the recently observed cascaded lasing in the ammonia QPML. 15…”
Section: Methodsmentioning
confidence: 99%
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“…We have additionally observed weakly enhanced absorption and amplification signals from rotational transitions respectively farther above and below the pumped transitions, obtained by a mechanism similar to the recently observed cascaded lasing in the ammonia QPML. 15…”
Section: Methodsmentioning
confidence: 99%
“…We have additionally observed weakly enhanced absorption and amplification signals from rotational transitions respectively farther above and below the pumped transitions, obtained by a mechanism similar to the recently observed cascaded lasing in the ammonia QPML. 15 Once the QCL is tuned into coincidence, both enhanced rotational transitions are strong enough to be measured by scanning the sub-THz source across their line shape. In order to measure each transition frequency with the highest accuracy, we used modulation spectroscopy in which the probe was modulated at frequency f and detected with a lock-in amplifier at frequency 2f .…”
Section: Methodsmentioning
confidence: 99%
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“…Despite recent advances, THz quantum cascade lasers, can operate only in pulsed mode using thermoelectric coolers and require cryogenic cooling for continuous wave (CW) operation. New possibilities are offered by exploiting the newly demonstrated THz molecular laser optically pumped by a mid-infrared (MIR) quantum cascade laser (QCL) based on ammonia (NH3) [2,3]. NH3 has several advantages for optical pumping: strong static dipolar moment, small molecular mass, high vapor pressure and strong absorption near 10 µm.…”
Section: Introductionmentioning
confidence: 99%