We report on a newly developed Q-switched diode side-pumped Er:YLF solid state laser emitting at 2.81 μm. Efficient short pulse generation is achieved by utilizing the relatively long lifetime of the upper laser level and the inherently linear polarized laser light of the Er:YLF crystal material. By means of an acousto-optic switch, peak powers of 50 kW with corresponding pulse widths of 70 ns and pulse energies of up to 3.5mJ are realized at a repetition rate of 100 Hz. The laser operates efficiently at room temperature and has a compact nature, enabling minimized thermal impact tissue ablation as well as pumping of non-linear crystals for mid-IR generation.
We report on a newly developed high-energy diode side-pumped Er:YLF solid state laser emitting at at 2.81 μm. The pulsed laser generates 100 mJ pulses at 400 μs and 100 Hz, respectively 10W average laser power. The laser operates efficiently at room temperature and has a good beam quality of M<sup>2</sup> < 12. The long lifetime of the upper laser level and the inherently linearly polarized laser beam of Er:YLF enables efficient Q-switching for tissue ablation with nanosecond pulses and pumping of non-linear crystals for mid-IR generation.
We report on a novel monolithic high-power diode pumped Tm:YAG laser at 2.02 μm. The pulsed laser generates average output power and pulse energy of beyond 90W and 900mJ in 400 μs pulses, respectively. This wavelength allows usage of standard fused silica fibers and optics, a price competitive solution for minimally-invasive endoscopic surgery. Recent developments in double-clad fiber combiners enable a rugged delivery system for the laser and the OCT ideal for a <i>seeing laser scalpel</i>. This gives the possibility to detect in-depth underlying tissue not yet ablated by the laser in a 2D or 3D fashion with micrometer resolution.
We demonstrated a monolithic high-power diode-pumped Er:YAG laser at 2.94 μm with average output power of up to 50W and pulse energy beyond 300mJ in 400 μs pulses. The high peak power of nearly 1kW is delivered in a high quality beam (M<sup>2</sup> < 15), maintained over a large cooling water temperature range of 18-25 °C. The improved resonator configuration allows for stable operation from 0-10% duty-cycle in contrast to prior developments showing saturation. As a first application, fiber-coupling into a 230 μm, 0.2NA GeO<sub>2</sub>-fiber with standard optics has been shown, reaching 30W average power and 200mJ pulse energy out of the fiber, only limited by the fiber..