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arXiv 2111.09501physics.opticsphysics.app-ph
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宽调谐氨量子级联laser泵浦分子laser的多线激光

Multi-line lasing in the broadly tunable ammonia quantum cascade laser pumped molecular laser

Paul Chevalier, Arman Amirzhan, Jeremy Rowlette, H. Ted Stinson, Michael Pushkarsky, Timothy Day, Federico Capasso, Henry O. Everitt

摘要:

气态氨已经被证明是量子级联激光泵浦分子激光器(QPML)的一个引人注目的增益介质,表现出良好的功率效率,但有限的可调谐性。在这里,我们探讨了氨QPML产生强大的,广泛可调谐的太赫兹频率激光旋转和纯反转过渡的潜力。在理论上预测了可能的激光频率,泵浦阈值和效率后,我们实验上证明了前所未有的可调谐性-从0.762到4.5 THz以上-通过广泛可调谐的量子级联激光器泵浦Q和R分支红外跃迁。我们还展示了两种类型的多线激光:同时纯反转和旋转反转过渡从同一泵浦旋转状态,级联激光涉及以下泵浦旋转状态的过渡。我们报告的单频功率水平高达0.33毫瓦,从一个小体积的激光腔。

英文摘要:

Gaseous ammonia has previously been demonstrated as a compelling gain medium for a quantum cascade laser pumped molecular laser (QPML), exhibiting good power efficiency but limited tunability. 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 0.762 to more than 4.5 THz -- by pumping Q- and R-branch infrared transitions with widely tunable quantum cascade lasers. We additionally demonstrate two types of multi-line lasing: simultaneous pure inversion and rotation-inversion transitions from the same pumped rotational state, and cascaded lasing involving transitions below the pumped rotational state. We report single frequency power levels as great as 0.33 mW from a low volume laser cavity.

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