Soft apertures for lasers emitting visible radiation
It was found that an Al2O3:Ti3+ crystal grown by the Verneuil method can be used in the fabrication of "soft" apertures for lasers emitting in the blue–green range. The experimental results indicated equalization of the intensity of the radiation across the laser beam and also "polychromatic" lasing when apertures made of Al2O3:Ti3+ were placed inside the resonator cavity.