Study on gain characteristic of Kr Ⅱ 469.5 nm laser oscillation in pulsed hollow cathode discharge

Using the "optical signal itself amplifing method",proposed by authors, the spatial and temporal gain characteristics of Kr Ⅱ 469.5 nm laser oscillation in pulsed hollow cathode discharge (HCD) was measursd by the self laser oscillation signal of the same discharge tube.The results show that,the laser oscillation was initiated at the center of the hollow cathod,then extended to whole hollow cathed.The maxmum gain of 103% m-1 was gotten in the optimum pressure ratio of He and Kr.It was arrived at about 2 μs after the dicharge,corresponding to peak of the laser pulse. The gain of laser oscillation is the highest in the reported results on this spectral line.Using the method of inserting the calibrated attenuation plates the gain was measured in the same discharge condition also.It shows that, the above measurement result is reliable.