Luminescence and stimulated emission of neodymium in sodium lanthanum molybdate powders

Powerful narrow linewidth random fiber laser

“…But in random lasers, there is no traditional resonator, which provides random lasers with special features compared with conventional cavity lasers. In earlier decades, researchers obtained random lasing in powder of active crystals [2], nanowires [3], and polymers [4]. The simplicity of realization of random lasers gives them an upper hand over conventional lasers.…”

Optically pumped mirrorless lasing. A review. Part I. Random lasing

“…The threshold character of the optically pumped emitted intensity, together with the spectral and temporal narrowing of the emission line have been reported for different scattering media such as crystal powders [2,3,88,89], dispersions of solid-particle dye solutions [76,[90][91][92][93], organic films and opal crystals [77].…”

“…Hundreds of microwave cosmic lasers based on the OH emission have been discovered since then. Other chemical species (СH, H 2 CO, H 2 O, 15 NH 3 , CH 3 OH, SiS, HC 3 N, SiO, 29 SiO, 30 SiO, H etc.) present in the interstellar space have been qualified as such that show some features of the amplified spontaneous emission.…”

“…To achieve the goal, recent there have appeared the ideas to combine together different mirrorless mechanisms in a single laser. This is indeed possible since there are numerous examples [2][3][4][5][6][7][8][9] when different mirrorless mechanisms take place simultaneously (see Section 3 for details). In spite of these points, still there has been no review considering all the three mecha-nisms together.…”

Determination of threshold random gain medium in dye: Polymer films containing TiO<sub>2</sub> nanoparticles

“…Random lasers (RL) are unique sources of stimulated emission in which the feedback is provided by scattering in a gain medium [1,2]. Random laser effects have been observed in a variety of organic and inorganic gain media including powders of solid-state luminescent and laser crystals [3,4], liquid laser dyes with scatterers [5], polymeric films with and without intentionally introduced scatterers [6], ZnO scattering films and nanoclusters [7], dye-infiltrated opals [8], porous media infiltrated with liquid crystals with dyes [9] and many others.…”