Here is a link to a resource from the part manufacturer:
Hope this helps, and thanks.
You're not going to be able to control that galvo directly with the Arduino - you're going to need a driver of some sort; my advice would be to contact Cambridge Technology and talk to them about their servo drivers (for instance: http://www.camtech.com/products/servos/Servo%20Driver-677XX.html), meant to control these galvos. They are designed to work with their galvos specifically, and can supply the proper voltage and current (note you are going to need a fairly hefty power supply as well). The controllers themselves expect to take a position input as a voltage level (for the above driver, +/- 10 VDC); so, you will still need an additional h-bridge controller off the Arduino to be able to supply this voltage to indicate position (the output from the h-bridge will be PWM'd, so you can't use it directly though - heck, I'm not even sure an h-bridge is the right solution, but you need something to generate the +/- voltage range). Another question to investigate will be whether the PWM output of the Arduino has a high-enough resolution to give small enough voltage steps to use all of the resolution of the servo controller/galvo combo...