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Second harmonic generation in quantum cascade lasers pumped by femtosecond mid-infrared pulses

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7 Author(s)
Liu, Sheng ; Center for Advanced Studies in Photonics Research (CASPR), University of Maryland, Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, Maryland 21250, USA ; Cai, Hong ; Lalanne, Elaine ; Liu, Peter Q.
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Second harmonic generation (SHG) pulses at λ ∼ 2.25 µm have been obtained from a 4.5 µm quantum cascade laser (QCL) when it is resonantly pumped by transverse magnetic polarized 120 fs, λ = 4.5 µm pulses through the QCL’s front facet at room temperature. The measured SHG spectrum narrows when the bias across the QCL increases due to the electron population re-distribution and subband realignment. The expected quadratic dependence of the SHG with pump power is observed but saturates at higher pump powers. The linear to nonlinear power conversion efficiency is calculated (∼2 µW/W2) and compared with theoretical calculation. This experiment provides an alternative way of investigating the carrier dynamics in QCLs.

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Applied Physics Letters  (Volume:99 ,  Issue: 12 )