Study On Accelerated Life Test Of He-Ne Laser

In order to find out the theory model and lifetime test method of life estimate of He-Ne laser under specific conditions of use, based on studying and analyzing the existing theories and experimental conclusion, assumed that the lifetime distribution of He-Ne laser obeys Weibull distribution and the accelerated equation is also anti-power law equation at large electric current, accelerated life test of 250mm He-Ne laser were carried out with electric current from 10mA to 35mA.Least-square principle and unitary linearity regression method were used to process experimental data. Experimental result show that when the acceleration stress of He-Ne laser less than 400% normal electric currents (5mA), the lifetime distribution of which obey Weibull distribution with same shape parameter and the failure mechanisms of the laser is that of normal electric current. The failure mechanism transformed under the large current. Namely, the shape parameter of Weibull distribution is not same, but the life distribution of He-Ne laser still obeys Weibull distribution and the accelerated equation is also anti-power law equation at large electric current. Whereas the slope of this anti-power law is different from that under small current, the two lines intersect at the point of 20mA.According to the testing result, the paper puts forward to estimate the characteristics lifetime of He-Ne laser at the normal work current though the intersection. The result is same to the lifetime that the factory provided. Consequently, the characteristic lifetime of He-Ne laser at the normal work current can be computed through that at the large current. In this way, the time for accelerated life test of He-Ne laser can be shortened effectively.