We report a PM all-normal, all-in-fiber passively mode-locked laser operating at 1030 nm. The main pulse shaping mechanism is provided by a tilted chirped-FBG. The laser delivers nanojoule range highly chirped pulses at a repetition rate of about 40 MHz. The FWHM of the optical spectrum is up to 7.8 nm leading to sub-500 fs compressed optical pulses. The influence of the filtering bandwidth and the output coupling ratio has been investigated.

We report an all-fiber passively mode-locked laser at 1030 nm. The principle of this ultrafast laser is based on nonlinear polarization evolution occurring in a long span of birefringent fiber spliced between a polarizer and a Faraday mirror. This configuration supports a large variety of pulsed regimes: noise-like, multiple pulses, burst, and single pulse mode-lock operation. In the single pulse mode-lock regime, the pulse duration is ~ 17.8 ps at a low repetition rate of 948 kHz. The spectral bandwidth is ~ 2.2 nm, the pulse energy is 68 pJ, and the polarization extinction ratio is estimated to 15 dB.

We have developed a fiber-based laser source operating at 515 nm. The experimental setup is composed of a 1030 nm picosecond fiber laser, a Volume Bragg Grating (VBG) based compressor, and a Second Harmonic Generation (SHG) module. The 1030 nm picosecond fiber laser is made with an ANDi mode-lock all-fiber oscillator using a tilted Fiber Bragg Grating (FBG) for spectral filtering. A bandpass filter centered at 1030 nm permits to reduce the bandwidth of the laser to 1.5 nm. A Chirped Fiber Bragg Grating (C-FBG) based stretcher increases the pulse duration to about 90 ps for avoiding nonlinear effects during amplification. A fiber pre-amplifier followed by a double-clad 15 µm core LMA fiber amplifier pumped with a 27 W multimode diode are subsequently used. The total available power at 1030 nm is 14 Watts. SHG is achieved with a type I non-critical phase-matching (NCPM), 15 mm long, Lithium Triborate (LBO) crystal. The 515 nm signal is near diffraction limit (M² < 1.2). The emitted average output power is 5.8 W, the pulse duration is 2.1 ps and the repetition rate is 89 MHz (SHG efficiency is 45%)

A rapidly tunable picosecond PM ytterbium fiber laser pumps an OPO for wavelength conversion to the mid-IR. This compact and transportable source permits fast sensing of methane, and hydrochloric acid with two different detection schemes.

We have developed a frequency-doubled mode-lock erbium doped fiber laser operating around 780 nm which delivers picosecond pulses with narrow optical spectrum. We expect this laser will be an efficient excitation source for Raman spectroscopy.

We experimentally compared the co- and counter-propagative pumping scheme for the amplification of ultra-short optical pulses. According to pumping direction we show that optical pulses with a duration of 75 fs and 100mW of average output power can be obtained for co-propagative pumping, while pulse duration is never shorter than 400 fs for the counter-propagative case. We show that the impact of non-linear effects on pulse propagation is different for the two pumping configurations. We assume that Self Phase Modulation (SPM) is the main effect in the copropagative case, whereas the impact of Stimulated Raman Scattering is bigger for the counter-propagative case.