Widely tunable Q-switched dual-wavelength synchronous-pulsed Tm-doped fiber laser emitting in the 2  μm region

Mostafa Sabra (1) , Baptiste Leconte (1) , Romain Dauliat (1) , Dia Darwich (1) , Tobias Tiess (2) , Anka Schwuchow (3) , Raphaël Jamier (1) , Georges Humbert (1) , Katrin Wondraczek (3) , Matthias Jäger (3) , Philippe Roy (1)

1 XLIM-PHOT - Photonique Fibre et Sources Cohérentes
2 Leibniz IPHT - Leibniz Institute of Photonic Technology
3 IPHT - Institute of Photonic Technology

We demonstrate a widely tunable Q-switched dualwavelength fiber laser emitting synchronized pulses in the 2 µm spectral range. Owing to the use of a thulium doped rod-type Fully-Aperiodic Large Pitch Fiber (FA-LPF), together with an acousto-optic modulator (AOM), and two Volume Bragg Gratings (VBGs), the wavelength separation was shown to be continuously tunable from 1 nm to 120 nm (~0.1-10 THz). A peak power of more than 8 kW was demonstrated over the whole tuning range for a repetition rate of 1 KHz and a 26 ns pulse duration. The repetition rate was modulated from 1 kHz to 30 kHz, and the laser pulse duration measured between 23 ns and 130 ns, depending of the repetition rate and the wavelength separation.

Domaines: Optique [physics.optics]

Mostafa Sabra, Baptiste Leconte, Romain Dauliat, Dia Darwich, Tobias Tiess, et al.. Widely tunable Q-switched dual-wavelength synchronous-pulsed Tm-doped fiber laser emitting in the 2  μm region. Optics Letters, 2019, 44 (19), pp.4690-4693. ⟨10.1364/OL.44.004690⟩. ⟨hal-02404903⟩