The Newport Computer Controlled Variable Attenuator Kit (CCVA-L) is an easy to use kit for the continuous, automatic attenuation of the laser output power. The CCVA application note describes a closed loop computer controlled variable attenuator for the control of output power from a fixed wave length laser. It is based on the combination of a ½ wave-plate and polarizer. The algorithm used to control power operates in a closed loop with PID (proportional, integral, derivative) feedback, compensating for slow changes in output power.

The Newport Computer Controlled Variable Attenuator Kit (CCVA-L) is an easy to use kit for the continuous, automatic attenuation of the laser output power. The CCVA application note describes a closed loop computer controlled variable attenuator for the control of output power from a fixed wave length laser. It is based on the combination of a ½ wave-plate and polarizer. The algorithm used to control power operates in a closed loop with PID (proportional, integral, derivative) feedback, compensating for slow changes in output power.