Laser Diode 취급 및 사용상 주의사항


10. Laser diodes are very sensitive to damage by electrostatic discharge (ESD), or other


voltage transients. The laser should be handled using static-safe procedures when it is taken


out of its static-protective shipping container. When the laser is not connected to a power supply,


the user should short the anode and cathode together to prevent static damage.



11. Some laser diodes are susceptible to damage from back reflections into the device.


This is more the case with lower wavelength material than with higher wavelengths. Thus, if


attempting to collimate the output, care must be taken to avoid back reflections.



12. The emission wavelength changes with temperature: the wavelength changes about +1 nm


for every 6º C increase in temperature. This value varies a little from wafer to wafer.




Thermal Management Precautions




1. Heat : This is the biggest cause of field failures.



2. Many customers do not appreciate the importance and/or the complexity of removing waste





3. Because operating temperature has a strong influence on laser lifetime, the heat-sinking of


the laser package is of tremendous importance and doing it well is not as simple as many


assume it is.



4. A high power laser diode is roughly 1/3 efficient: a one watt laser will generate about 2 watts


of heat.



5. Waste heat must be removed efficiently and instantaneously, or the laser will heat up and burn


out, or, as a minimum, experience an abbreviated lifetime.



6. The laser can be operated at higher temperatures than recommended, but the lifetime of the


laser is reduced exponentially as the operating temperature is increased.



7. The laser package must be securely attached to a cooled heatsink. The heatsink may be


cooled by water, air, or thermoelectric coolers.