Working with Incorrect Laser Calibration Factors

Sammy Avisror
October 18, 1999

Question:

Ariel, Merav was at a customer and had a problem with some of the diodes failing at 320mw. She noticed that the lowdac and highdac factor was 6.6667 but in the paper and on the light detector it was 4.000- when she changed the number to 4 everything worked fine and she could calibrate to higher intensities. What is the effect (if any) on quality or the life of the laser diode or what is the effect of using the wrong factor?

Jim B

Answer:

The value 6.6667 is the default factor of the light detector. If you find a machine with this value, it probably means the correct value was overwritten by the default one. In this case, the light calibration procedure will calibrate the lasers to a wrong value. For example, in the case you described, when Merav calibrated the lasers to 320 mW, they were actually calibrated to 530 mW. This is the reason why some of them didn’t succeed to achieve this very high intensity.
Using a wrong factor means you are not working at the intensity you think you are working at.

Make sure that you importing the original registry of the machine when you over right the hard drive