The AAS20A5V is an electronic power supply block designed
for driving diode lasers with up to 20A low noise current.
The output current can be set by an analog voltage of 0 to
2.5V, an external potentimeter, or an internal potentiometer,
to between 0 to 20A.
Datasheet for AAS20A5V|
More information, please see http://www.analogti.com/aas20a5v.html and http://www.analogtechnologies.com/laserdriver.html