Abstract
We present a traveling-wave-type optical parametric amplifier (OPA) pumped at 1.03μm by a Yb:KGW laser that produces tunable high-energy pulses of 6.5–4μJ in the mid-infrared (mid-IR) region from 3.6 to 7μm. Pumping with negatively chirped pulses generates nearly transform-limited (TL) mid-IR pulses of 300–330fs length. Pumping with TL pulses of 200fs not only decreases the output energy by a factor of 1.5, but also decreases the mid-IR pulse-length to 160fs after additional compression. The compact and simple OPA setup is ideal for femtosecond infrared experiments in the fingerprint region.
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