We have developed a fast wavelength modulated mid-IR source, especially designed for gas spectroscopy. The whole laser source is composed of a picosecond fiber laser emitting a spectrally narrow signal which can be modulated between 1028.3 nm and 1029.3 nm at the kHz range. This fiber laser seeds a Synchronously Pumped Optical Parametric Oscillator. This latter converts the near-IR pump (1028.3 nm) to the mid-IR region (3000-3500 nm) with equivalent modulation parameters i.e. 10 cm<sup>-1</sup> tuning range at the kilohertz modulation frequency. This laser was combined with a photo-acoustic cell for methane detection.
A 1064 nm picosecond hybrid fiber/bulk laser delivering 85 μJ, 30 ps pulses is reported. The whole laser chain is made of a compact fibered mode-lock oscillator, pulse-picker and ytterbium doped amplifiers while high pulse energy operation is achieved thanks to a Nd:YVO<sub>4</sub> crystal amplifier which permits to obtain MegaWatt range peak power pulses without detrimental nonlinear effects. This laser system has been designed in order to efficiently produce LIPSS on metals.
A picosecond laser emitting alternatively two wavelengths separated by 1 nm around 780 nm is demonstrated. This source is designed for advanced Raman spectroscopic measurements for which two spectra at two different pump wavelengths are acquired. The difference between the two measurements permits to discriminate the Raman contribution from the noise (SERDS). For such purpose, we developed a mode-lock fiber laser delivering a broad optical spectrum around 1560 nm which provides, through filtering with Fiber Bragg Gratings, the two required wavelengths operation. Second Harmonic Generation at 780 nm is then performed with a fibered coupled bulk PPLN.