High-energy nanosecond pulse extraction from a Tm-doped photonic crystal fiber laser emitting at 2050 nm with narrow linewidth.

A nanosecond-pulsed diode-pumped Tm-doped fiber laser (TDFL) operating at 2050 nm is reported based on a flexible photonic crystal fiber (PCF) with a core diameter of 50 µm. Analytical evaluation of reabsorption effects and optimization of the fiber length allow enhanced pulse energy extraction at long wavelengths. This enables the generation of Gaussian-shaped pulses with pulse energies of 1.

High-power continuous-wave Tm:Ho-codoped fiber laser operation from 2.1 µm to 2.2 µm.

A Tm:Ho-codoped free-space single-oscillator fiber laser is under investigation with special focus on the power scalability of emission wavelengths from 2.1 µm to 2.2 µm.

High pulse energy ZnGeP OPO directly pumped by a Q-switched Tm-doped single-oscillator fiber laser.

A mid-infrared ${{\rm ZnGeP}_2}$ optical parametric oscillator pumped by a ${{\rm Tm}^{3 +}}$-doped fiber laser is reported, providing pulse energies of $230 \;\unicode{x00B5}{\rm J}$, pulse widths of 40 ns, and peak powers of ${\sim}6\;{\rm kW} $ with excellent efficiency and beam quality. The pump source is an actively $Q$-switched single oscillator optimized to generate high pulse energies.