User:Andy Maloney/Notebook/Lab Notebook of Andy Maloney/2009/03/20/Optical tweezers

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Condenser

So I got the part from John today. It is the dovetail flange that was designed to accommodate Thorlabs' ø2" lens tubes. Here are some shots of it.

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Error creating thumbnail: Unable to save thumbnail to destination

I was also able to assemble the QPD housing. Complete with room for optics and removable ND filter holders.

Error creating thumbnail: Unable to save thumbnail to destination

One issue is that the condenser doesn't actually make it to the sample plane. This is an extremely easy fix since I had John make the "SM2" threads from Thorlabs'. Thanks Thorlabs for providing the thread dimensions! All we have to do is order a longer ø2" lens tube which has already been done. I love engineering things that work.

Diode laser

It turns out that I can connect some back plane pins to get monitoring of temperature, current, and possibly power from the laser system. This is beyond cool because Larry can program a DAQ in LabVIEW to monitor everything.

I've already tried this and it works for temperature monitoring. One issue I think I may have is grounding. Typically a BNC connector will ground to the chassis but, I grounded my trial to one of the GND pins on the ITC133. I think I should probably ground to the board, but I'll have to make sure the BNC panel mounts do not ground to the chassis. This may prove to be irritating if I can't find isolated BNC panel mounts.

Yeah! I did find Isolated mounts!

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