Abstract
We have demonstrated efficient generation of high beam quality, high-energy and broadband tunable femtosecond mid-infrared pulses using a three-stage collinear optical parametric amplifier (OPA). The white-light continuum (WLC) seeded OPA setup, based on KTA crystal in three stages and pumped by a femtosecond laser pulse at 800nm, is capable of producing idler wavelength ranging from 2.4μm to 4.0μm with energy up to 82μJ at 3.27μm, which corresponds to signal energy of 350μJ at 1060nm. The output pulse has excellent intensity distribution with measured beam quality factor M2~1.1 for signal and M2~1.7 for idler. To our knowledge, this is the best beam quality reported in 3–5μm femtosecond OPA until now. The achieved mid-infrared pulse also has a good energy stability with a fluctuation of 1.01% rms over half an hour.
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