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We demonstrate a compact 290 fs, 0.5 mJ laser source at 2-μm wavelength generated from mJ-level 3.4-ps pulses from a fiber laser seeded Ho:YLF regenerative amplifier system via pulse compression in a gas-filled Kagome type HC-PCF.
Absorption spectroscopy of NH3 at 9.1 μm is demonstrated with a quantum-cascade-laser absolutely referenced to a Tm-fiber frequency-comb. Highly-accurate spectroscopic parameters are retrieved by a multiple-line fitting approach applied to the spectral manifold.
Carrier envelope phase locking of a frequency comb based on an in-line low-noise Er fiber system is demonstrated. The repetition rate and the carrier envelope offset frequency are locked by two phase locked loops over several hours.
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