This question goes out to anyone who's dealt with EMI control and small-voltage surge suppression.
I'm designing a PCB to control a nd:YAG laser head, which includes the low-voltage circuits (motors, shutters, sensors, etc). However, the laser is lamp-pumped from an arc lamp driver. Whenever the lamp first turns on, it delivers a healthy explosion of EMI. Better yet, the lamp driver cables are tied into a 10-foot umbilical, where they get to twist and turn around thirty of my low-voltage wires.
The EMI's fundamental frequency is in the 2-4 MHz range, with plenty of harmonics, but lasts for less than a couple microseconds. When the entire cable umbilical is connected to the laser, the board may see a couple volts of wiggle - observing the waveform across one IC, I noted that power and +5V rang enough to blur each other, causing the IC to go astable and then reset itself. The problem is compounded by the fact that I have about 30-35 signals that leave the PCB that pick up this EMI, so a mass-approach that's economical is key.
Regular surge suppression tricks like MOVs won't work, because it's not overvoltage that I need to eliminate. I've looked at surface-mount pi filters, but they divert the unwanted energy into a ground signal and I'm not sure how to efficiently dump it away from my circuits.
Is there anybody out there who's had experience in eliminating high-frequency ringing without excessive cost in board space or parts count?