“…High reliability, stability and compactness of these devices lead to their potential usage in various fields of science, medicine, industry, communications, etc. During last years the number of active solid-state media were developed which emit light in a wide range of the electromagnetic spectrum. − It should be noted, that the most advanced lasers based on organic solid-state active media, for instance, coumarines, at present, emit in the blue-green region of the visible light spectrum. − In recent time a number of solid active media based on the BODIPY, − perylene, , rhodamine − dyes and dye-doped matrices with silica-containing polymers. , and hybrid matrices, , emitting in the orange and red regions have been successfully developed. − It is well-known that just the emission in the red range of the spectrum can deeply penetrate into biological tissues. Therefore, the creation of solid-state active medium emitting in this spectral range is a vital necessity in applied medicine.…”