Ultrafast Raman laser mode-locked by nanotubes

We demonstrate passive mode-locking of a Raman fiber laser using a nanotube-based saturable absorber coupled to a net normal dispersion cavity. This generates highly chirped 500 ps pulses. These are then compressed down to 2 ps , with 1.4 kW peak power, making it a simple wavelength-versatile source for various applications

Ultrafast parametric amplifier pumped by a fiber laser system

The generation of high energy femtosecond pulses in Optical Parametric Amplifier (OPA) pumped by fiber laser at a repetition rate of 1MHz is reported. Highly nonlinear fibers are used to create an intrinsically synchronized signal for the parametric amplifier. Seeding the OPA by a supercontinuum generated in a photonic crystal fiber, large tunability extending from 700 nm to 1500 nm of femtosecond pulses is demonstrated, with pulse energies as high as 1.2 µJ. Generating the seed using only SPM in a standard fiber, broadband amplification over more than 85 nm and subsequent compression down to 46 fs in a prism sequence are achieved. Pulse peak powers pulses above 10 MW together with 0.5 W of average power is achieved. This system appears to be very interesting due to scalability of pulse energy and average power of both involved concepts: fiber laser and parametric amplifier

How much plastic have you drunk today?

Worldwide, one in three people do not have access to safe drinking water [1], resulting in the deaths of nearly 1000 children every day. Standard tests can take several days to produce a result [2], by which time it is often too late since the contaminated and polluted water has already been used. Hence, there is a clear need for rapid and specific testing that can produce results in real time. Here, we focus on microplastics pollution in drinking water. A typical pollution pathway is shown in Fig. 1 [3].Published versio

High energy direct amplification of femtosecond pulse in a highly non-linear fiber amplifier

International audienc

High energy direct amplification of femtosecond pulse in a highly non-linear fiber amplifier

International audienc

Stretcher-free high energy nonlinear amplification of femtosecond pulses in rod-type fibers

We report on the study of direct amplification of femtosecond pulses in an 80 microns core diameter microstruc-tured Yb-doped rod-type fiber amplifier in the nonlinear regime. The system includes a compact single grating compressor for the compensation of the small dispersion in the amplifier. With a 1250 line / mm (l/mm) grating-based compressor, pulses as short as 49 fs with 870 nJ pulse energy and 12 MW peak power are obtained. Alternatively, the use of a 1740 l / mm grating allows the production of higher quality pulses of 70 fs, 1.25 microjoule pulse energy, and 16 MW peak power.High Power Lasers based on Ytterbium-doped Fibres in Femtosecond regim