Femtosecond mid-infrared difference-frequency-generation tunable between 3.2 μm and 4.8 μm from a compact fiber source

We demonstrate a mid-infrared laser source tunable between 3.2 mum and 4.8 mum with an average output power of more than 1 mW. The spectral bandwidth of up to 325 nm supports sub- 60-fs pulses.