Optics in Motion Fast Steering Mirror (FSM)

[lcarlson]

I am wondering if anyone has purchased a mirror from OIM, namely the OIM101 voice-coil 1" mirror.  I am using LV8 to control the mirror using signals from a position sensitive detector (PSD).  The problem I am having is cross-talk between the two axis.  A sine wave given to one axis will influence the other axis significantly more than the spec of 1%.  It seems as if the internal PID feedback control system inside the mirror is having problems keeping the non-steered axis flat.  Has anyone else experienced this, perhaps even with another type of steering mirror?

Thanks,
lcarlson

[Jochen]

Icarlson,

what's the interface between your mirror and the PC? Do you use analog outputs? Is there a chance that the crosstalk is caused by the wiring?

Best regards,

Jochen Klier
National Instruments Germany

[lcarlson]

The interface was initially analog outputs from my DAQ card, but then I took a step back and used a signal generator to produce the sine wave, with the same results.  I will look into the wiring and see if there are any connections touching, etc.

thanks,
lcarlson

[AnalogKid2DigitalMan]

I took a look at the company's web site, all I can guess is that the axes of the PSD are not aligned true to the axis of the mirror actuators.

Have you contacted the compandy directly regarding this?

[lcarlson]

The axis are lined up orthogonal to each other and with the table and sensor.  The cross correlation between the axis is not linear, but rather sporatic.  A sweep in the horizontal axis yields a bumpy line when imaged visually on the wall.  Yes, I am conversing with the company - they feel that perhaps the internal PSD may be dirty and therefore convoluting the feedback control.  We are working on that now.