Many lasers are limited to firing pulses based on an internal clock source and cannot be asynchronously triggered from an external signal such as from Aerotech’s Position Synchronized Output (PSO) feature. One approach to working with this laser type is to set the pulse width of the PSO output to be the same as the period of the laser clock signal to ensure that the PSO output is active at the laser input sample time (usually the rising or falling edge of the clock). In practice, however, the frequencies of the PSO and laser clock vary based on tolerances of the devices used to synthesize the clock. This variability will result in missed pulses when the PSO output width is shorter than the laser clock period, or in extra pulses when the output width is longer than the clock period.

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