Repetitively pulsed Fe : ZnSe laser with an average output power of 20 W at room temperature of the polycrystalline active element

Investigations of Nanoscale Defects in Crystalline and Powder ZnSe Doped With Fe for Laser Application

“…Time dependant spectral characteristics of ZnSe:Fe 2+ laser, which were measured in the research, were nearly the same as we had got earlier at detail investigations of active ele‐ments fabricated by Fe ions doping of the both sides using diffusion technique . Figure shows typical ZnSe:Fe2 + laser spectrum averaged over 10 pulses at absorbed energy density 1.5 J cm −2 .…”

“…This spectrum practically did not differ from those obtained for a polycrystalline active element with large transverse dimensions, which had been grown by a CVD technique followed by the HIP processing . Such elements are characterized by a high concentration of iron ions in the surface layers and a high total absorption of pumping radiation in comparison with single‐crystal elements.…”

Investigation of Mid-Infrared Broadband Second-Harmonic Generation in Non-Oxide Nonlinear Optic Crystals

“…The Sellmeier equations of each crystal used in the calculations are listed together in Table 6. The F-wave resonances are interspersed in the spectral range of 4.37-9.47 µm, which corresponds to the spectral range of various mid-IR lasers such as high-power quantum cascade lasers (QCLs) based on buried-ridge or strain-balanced waveguides (WGs); distributed feedback (DFB) lasers based on plasmon-enhanced WGs or corrugated surface gratings; external cavity lasers in various bound-to-continuum designs; solid state lasers based on chalcogenide crystals doped with Fe 2+ ; and gas lasers [62][63][64][65][66][67][68][69][70][71][72][73][74][75]. The intersection of the red and magenta (or blue and cyan) curves indicates the direction of the F-wave vector (i.e., θ) and the λF value corresponding to the SH resonance for Type I (or Type II).…”

“…The Sellmeier equations for the mid-IR biaxial crystal used in the calculations are listed together in Table 7. The F-wave resonances span over the spectral range of 3.5-5.1 µm, which corresponds to the spectral range of mid-IR lasers such as high-power QCLs, DFB lasers, optical parametric oscillator lasers, solid state crystalline lasers, and gas lasers [65,66,[70][71][72][73][74][82][83][84][85].…”

“…The Sellmeier equations for the mid-IR biaxial crystal used in the calculations are listed together in Table 7. The F-wave resonances span over the spectral range of 3.5-5.1 µm, which corresponds to the spectral range of mid-IR lasers such as high-power QCLs, DFB lasers, optical parametric oscillator lasers, solid state crystalline lasers, and gas lasers [65,66,[70][71][72][73][74][82][83][84][85]. The magnitudes of the effective NLO coefficients (d eff ) of biaxial crystals are determined by the set of solutions for λ F , θ, and ϕ, satisfying the broadband SHG conditions, as described in the paragraphs with Equations ( 20)- (24).…”