| 摘要 |
A laser control circuit in which the laser is driven by a voltage controlled, current driver. At the beginning of each scan, an outer loop senses the laser power, and compares it at an outer loop summing junction to a predetermined value to generate a correction, and then applies that correction to the current driver through an inner summing junction. Within each scan, an inner loop detects the voltage across the laser and applies it as a correction voltage to the inner loop summing junction. The result is that at the beginning of each scan the laser power is set, and during the scan the voltage across the laser is held constant.
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