In the actual aging engineering, if the periodic test is adopted, there will also be many external factors, mainly temperature instability, equipment measurement and control instability, equipment reliability and power failure.

  One reason for the difficulty of temperature control is the spontaneous heat of the laser, which has a thermal resistance of 5~10 C/W even if the To-can package on the exposed aluminum radiator is tightly mixed. there may be a temperature difference of 1.5℃ inside the laser and the heat sink if the laser operates at 100 mA and 1.8 V.

  At the same time, the laser is sensitive to temperature at a given current, even if the heat sink fluctuates only 0.1℃, it will cause noise of output optical power. Moreover, the Guang Min diode used for measurement is also affected by temperature, and different optical power data are obtained, so it is necessary to control its temperature.

  Laser life cycle research requires accurate measurement of laser operating parameters or even a few percent changes in thousands of hours. Therefore, the stability of the test equipment must reach 0.1% within 1000 hours.

  Aging is also a process of laser product screening, screening out products that may have a shorter life, so that the remaining large number of lasers have satisfactory acceptable reliability. Because aging has an impact on production costs and time, the general aging time is less than 100 hours.