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In a room temperature 4.5 μm QCL resonantly pumped with fs Mid-IR pulses, we observe an ultrafast gain recovery within the first 200 fs, gain oscillation within the 1 ps and a slower gain recovery of lifetime ∼2–3 ps.
Room temperature second harmonic generation at λ=2.2 μm has been obtained from a 4.5 μm quantum cascade laser resonantly pumped by TM or TE polarized λ=4.5 μm femtosecond pulses through the front facet.
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