Room-temperature 1.2-J Fe²⁺:ZnSe laser

Synthesis of Fe:ZnSe nanopowders via the co‐precipitation method for processing transparent ceramics

“…Even at the highest dopant level of 6 at% Fe 2+ ( x = 0.06), no secondary Fe‐rich phases were present, which indicated that all of the introduced Fe 2+ was completely incorporated into the materials' crystal lattice via substitution for Zn 2+ ions. The resulting final dopant content of Fe 2+ was the equivalent of approximately 3.3 × 10 20 cm −3 , which was higher than that achievable by crystal growth technique, thermal diffusion, or solid phase recrystallization techniques . Moreover, a shift in the position of characteristic diffraction peak toward lower angle was observed with increasing Fe 2+ content from x = 0.00 to x = 0.06 as shown in Figure A.…”

“…The resulting final dopant content of Fe 2+ was the equivalent of approximately 3.3 × 10 20 cm −3 , which was higher than that achievable by crystal growth technique, thermal diffusion, or solid phase recrystallization techniques. 3,6,21 Moreover, a shift in the position of characteristic diffraction peak toward lower angle was observed with increasing Fe 2+ content from x = 0.00 to x = 0.06 as shown in Figure 5A. According to the Bragg equation:…”

“…For direct laser generation in the 3‐5 μm region, Fe 2+ ‐doped ZnSe (Fe:ZnSe) is likely to be the most thoroughly investigated TM:II‐VI materials. In 2015, a 3.8‐4.2 μm tunable solid‐state laser with a high average power of 35 W was operated on Fe:ZnSe at low temperature, and in 2016, a 1.2 J laser output was obtained on Fe:ZnSe at room temperature …”

“…In 2015, a 3.8-4.2 μm tunable solid-state laser with a high average power of 35 W was operated on Fe:ZnSe at low temperature, 5 and in 2016, a 1.2 J laser output was obtained on Fe:ZnSe at room temperature. 6 In addition to the technical problems in laser science, the preparation methods of high quality Fe:ZnSe material also present important challenges in obtaining satisfying direct-pumping solid-state mid-infrared lasers. Up to now, there are five main methods that are commonly employed to fabricate Fe:ZnSe laser materials: (a) physical/chemical vapor transport growth, (b) melt growth technique, (c) thermal diffusion, (d) solid phase recrystallization and (e) hot-pressing transparent ceramics.…”

“…In 2015, a 3.8-4.2 μm tunable solid-state laser with a high average power of 35 W was operated on Fe:ZnSe at low temperature, 5 and in 2016, a 1.2 J laser output was obtained on Fe:ZnSe at room temperature. 6 In addition to the technical problems in laser science, the preparation methods of high quality Fe:ZnSe material also present important challenges in obtaining satisfying direct-pumping solid-state mid-infrared lasers. Up to now,…”