Yurii V Korostelin

1 Watt, 59 % slope efficiency, 2.65 pm Cr 2+ :CdSe laser with tenability of 560 nm

We report the highest slope efficiency from a Cr²⁺:CdSe laser. The sample was multilayered dielectric coated with TaO<inf>2</inf> and SiO<inf>2</inf> to achieve this performance. The output beam was a diffraction limited TEM<inf>00</inf> gaussian mode.

Thermo-optical and lasing characteristics of Cr 2+ -doped CdSe single crystal as tunable coherent source in the mid-infrared

We report on a comprehensive characterization of Cr2+-doped CdSe single crystal as an efficient active material for tunable laser applications in the mid-infrared spectral region. Optical gain, thermo-optical behavior, power efficiency, scalability and wavelength tunability have been thoroughly investigated. Using an antireflection-coated crystal pumped by a Tm-fiber laser at at 1.94 μm, 1-W CW output power and 50% slope efficiency at 2.65 μm emission wavelength have been obtained in a diffraction-limited output beam. An output peak power of 2.5 W has been achieved without significant beam distortion in a quasi-CW regime. Exploiting an intra-cavity diffraction grating in a Littrow configuration, a maximum tuning range of 900 nm from 2.22 to 3.12 μm, limited by the finite bandwidth of resonator components, has been demonstrated with an uncoated crystal.

Continuous-wave Cr{sup 2+}:CdS laser

Continuous-wave lasing is obtained for the first time in a Cr{sup 2+}:CdS crystal pumped by a thulium fibre laser at 1908 nm. The output power of the laser at 2534 nm achieved 0.81 W with the slope efficiency with respect to the absorbed pump power equal to 52.3%. The parameters of Cr{sup 2+}:CdS and Cr{sup 2+}:CdSe lasers are compared. A Cr{sup 2+}:CdSe crystal generated 1.7 W of cw radiation at 2638 nm with the slope efficiency with respect to the absorbed power equal to 53.4%. (lasers)

A continuous-wave Fe{sup 2+}:ZnSe laser

A continuous-wave oscillation is obtained for the first time in a Fe{sup 2+}:ZnSe laser. The laser wavelength was in the range from 4.04 to 4.08 {mu}m. A liquid-nitrogen-cooled active element was pumped by a Cr{sup 2+}:CdSe laser at 2.97 {mu}m. The maximum output power of the laser was 160 mW with the 56% slope efficiency. The minimum absorbed pump power threshold was 18 mW. The intrinsic losses in the Fe{sup 2+}:ZnSe crystal did not exceed 0.024 cm{sup -1} during lasing. (lasers. amplifiers)