METHOD OF FORMATION OF RING-SHAPED LASER RADIATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1995 - IPC

FIELD: laser technology. SUBSTANCE: electromagnetic field resonating on only one longitudinal mode ТЕМ_oo is generated when fulfilling necessary proportions between wall thickness and diameter of tube excited uniformly and continuously. Its radiation is capable of decreased divergence and more uniform distribution of power within area of ring. Using passive filtering of resonating electromagnetic field one generates radiation of most clear specified color. Compact inexpensive multicolored controlled laser device is manufactured by assembly in one case of single cylinder of resonators laid concentrically inside each other, tubular pumping valves, screens and cooling layers. EFFECT: enhanced operational quality of device, its reduced cost and ease of handling. 18 cl, 7 dwg, 2 tbl