Sub-cycle high-order nonlinearities in a terahertz quantum cascade laser
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)(2022)
摘要
Ultrafast electron dynamics in quantum cascade lasers hold enormous potential for the implementation of intense, compact mode-locked terahertz sources, squeezed terahertz light, frequency mixers, and comb-based metrology systems. Yet the important sub-cycle dynamics have been notoriously difficult to access in operational terahertz quantum cascade lasers. Here we show the first field-resolved two-dimensional terahertz spectroscopy of a free-running quantum cascade laser, revealing its sub-cycle gain dynamics and disentangling resonantly enhanced high-order nonlinearities up to eight-wave mixing in a regime of negative absorption.
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关键词
quantum,sub-cycle,high-order
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