Tara got me the information about the adjustable collimator tube he ordered (http://www.thorlabs.us/thorproduct.cfm?partnumber=SM1L30C). I built a mount in Solidworks and added it to the assembly. I also contacted Thorlabs and am discussing how easy it will be to shorten the tube, since we don't need it nearly as long and the length gets in the way a bit. This should be doable. 

I decided that we would go for a box where everything is screwed onto a baseplate, and a lid is screwed to the sides of the baseplate. The reason for this is that the base plate will be much easier to build on than building on the bottom of a box. The screws are on the side instead of the top because this will be easier to have machined, and the design is more compact leaving less room for noise when the lid is disturbed. 

I'm currently looking at a few tasks that I will try and complete soon: 

• How do we plan to mount the grating? Most literature uses Epoxy, but it may be less noisy to design something on the grating mount to hold the grating and clamp it in. I'm examining which will create less noise. 
• Is the choice of PZT ok? This involves several things. We need to consider the distance the PZT needs to be able to move and whether it will fit inside the grating mount we have designed. 
• Will we be using D-Sub or BNC connections? BNC is better for rf, but it only has one channel on each coaxial cable so it is bulker. D-Sub is much more compact, and we can wire several channels at once. Right now I am planning on using D-Sub for the TEC wiring, probably a 9 pin connector using 4 for the +/- thermistor and the +/- Peltier element connections. The current driver may be in the rf range if we want to create sidebands, in which case we will want to use BNC cables. I'm looking into this. 

Attached is a picture of the current setup, built in Solidworks and the lid built separately. I'm not going to bother attaching the Solidworks files until things are more finalized.