The Study Of Noise In CW. LD End-Pumped Nd:YAG Laser

The noise in DPL has seriously influenced the property of output beam. A C.W. LDend-pumped NdfYAG laser being the model for the experiment, the artic1e dea1s with suchnoise as intensity noise, frequency noise and field distributing noise of DPL laser. ThefOllowing results are obtained: The relaxation oscillation of laser is the main reason ofintensity noise. The frequency of relaxation oscillation shifts to high frequency with theincrease of pump power and shifts to low frequency with the rising of crystal temperature.The gain in laser decreases as crystal temperature raised, then results the falling of outputpower. Other conclusions about frequency of output and M2 are also reached. Based onexperiment data, the change of upper energy lever life of Nd:YAG particles on temperatureis also worked out as l.83 W/K, and the change of emission section on temperature is -0.l46 X l0-locm2/K.