Romain Royon

High power, continuous-wave ytterbium-doped fiber laser tunable from 976 to 1120 nm.

We report on a linearly-polarized, continuous-wave Ytterbium-doped fiber laser continuously tunable on the fly over an unprecedented emission bandwidth ranging from 976 nm to 1120 nm and delivering a minimum of 10 W and a maximum of 41 W. Additionally, the bandwidth of the system can be tuned from 100 pm to more than 1 nm at all wavelengths.

Mode-locked 0.5 μJ fiber laser at 976 nm.

We report on high-energy femtosecond pulse generation from an ytterbium-doped rod-type fiber oscillator emitting around 976 nm. Self-starting and stable single-pulse operation are demonstrated with 4.2 W of average output power at a repetition rate of 8.4 MHz. The resulting energy level reaches 0.5 μJ. Because of the all-normal dispersion of the laser cavity, output pulses are naturally chirped with a duration of 14 ps. External compression using diffraction gratings shortens the pulse duration down to 460 fs.

fs Mode-locked fiber laser continuously tunable from 976 nm to 1070 nm

Most of the works on mode-locked systems exploit the quasi three-level system in order to obtain an emission between 1020 nm and 1080 nm [1-4]. The vicinity of 976 nm, corresponding to a true three level system has also been investigated [4-5]. Interesting challenges are the combination of broadband emission and high-energy pulse generation in a mode-locked regime.

30 W, CW Yb-doped fiber laser tunable over 144 nm

Most of the tunable Yb-doped fiber lasers exploit the quasi-four-level system between 1030-1100 nm. Extending the tunability over the whole emission bandwidth of Yb-glass and therefore covering the wavelengths between 976 nm and 1020 nm requires (i) reaching transparency and (ii) controlling the gain competition between short wavelengths (three-level transition) and 1030 nm emission (quasi three-level transition). For higher wavelengths above 1070 nm, the reabsorption and the emission are weak. The laser scheme is in this case, a nearly pure four-level system where the gain is proportional to the overall upper-state population.

500 nJ femtosecond fiber laser at 976 nm

Yb-doped fibers pumped at 976 nm will naturally amplify radiation in the 1020–1080 nm spectral bandwidth. Alternatively, pumping at 915 nm allows producing emission at 976 nm under specific conditions exploiting the three-level operation [1]. Recently, an Yb-doped fiber laser delivering up to 94 W at 976 nm in the continuous-wave regime has been demonstrated [2, 3]. Based on a similar approach, a millijoule-class laser at 976 nm operating in the Q-switch regime with up to 70 W average power has been achieved [4].

Continuously tunable sub-ns ytterbium-doped MOPA system for frequency conversion

Pulsed ytterbium-doped fiber lasers and amplifiers cover a large field of applications in industry, medicine or science. Yd-doped materials and in particular Yb-glass fibers provide broad gain bandwidth potentially ranging from 1000 to 1150 nm. Such a property can therefore be implemented in applications involving either broadband spectra and eventually ultra short pulses or narrow spectra centered within that range.

500 nJ mode-locked fiber laser at 976 nm

We report on high energy femtosecond pulse generation from an all-normal-dispersion fiber oscillator emitting around 976nm. The laser delivers chirped pulses of 23ps and an energy of 500nJ. Pulses are externally recompressed down to 460fs.