We demonstrate a compact mid-IR system using difference frequency generation based on a femtosecond Ytterbium fiber laser system operating at a repetition rate of 100 MHz. By utilizing the fundamental 1 µm emission of the Yb-laser system and the widely wavelength-tuneable soliton emission of a PCF, high output power levels of more than 100 mW are realized over a large tuning range from 3 µm to 4.9 µm. This system demonstrates a powerful and widely tuneable femtosecond mid-IR source in a compact and robust design for applications such as infrared microscopy and spectroscopy.
We demonstrate a compact mid-IR system using difference frequency generation based on a femtosecond Ytterbium fiber laser system with a repetition rate of 100 MHz. Based on the fundamental 1040 nm beam, we use frequency conversion in a nonlinear fiber to generate a tuneable signal beam for mid-IR generation based on difference frequency generation. We investigate different nonlinear fibers for signal generation between 1100 nm and 1600 nm for optimum mid-IR generation between 3 µm and 10 µm, for which power levels of more than 200 mW have been observed at an emission wavelength of 4 µm.
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