Hi Eric,
I'm building my laser-markers with the E1701D galvo controllers and BeamConstruct software.
My fiber-lasers are from JPT -- but have several older IPG too, when planning to bild other types for my own or different use cases.
The pulsed lasers from IPG needs either serial communication to set power, or an analogue voltage from 0-4V -- the CW-types needs 0-5V ... then it's modulating the laser by TTL-pulses (or constant on for CW operation).
Look into the documentation of the E1701 boards -
http://halaser.de/compare.php
They can handle different types of lasers ... and IPG.types too ...
Viktor