Abstract

We report single-pass difference-frequency generation of mid-infrared femtosecond pulses tunable in the 3.24.8μm range from a two-branch mode-locked erbium-doped fiber source. Average power levels of up to 1.1mW at a repetition rate of 82MHz are obtained in the mid infrared. This is achieved via nonlinear mixing of 170mW, 65fs pump pulses at a fixed wavelength of 1.58μm, with 11.5mW, 40fs pulses tunable in the near-infrared range between 1.05 and 1.18μm. These values indicate that the tunable near-infrared input component is downconverted with a quantum efficiency that exceeds 30%.

© 2007 Optical Society of America

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