Stable random lasing in CdSSe micropowders

The random lasing in CdS micropowder in the green region (near 520 nm) at room temperature under optical pumping by pulsed Nd3+ : YAG and N2 lasers at wavelengths of 355 and 337 nm, respectively, is studied. The influence of fluctuations of pump pulse output energy on the random lasing action in CdS micropowder is determined. It is shown that the use of a pump laser with highly stable output power and high spatial beam uniformity (in particular, an N2 laser) provides stable random lasing in CdSSe micropowders. The lasing is characterised by the presence of a clear structure of narrow lines in the spectrum and stability of their position during pulsed operation at a repetition rate of 700 Hz at wavelengths of 525, 570, 600, and 650 nm with thresholds in the range of 1100 - 1600 kW cm−2.