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Entry  Fri Jun 28 17:59:15 2013, Chloe, Notes, ECDL, Parts to Order 
    Reply  Mon Jul 1 17:39:09 2013, Chloe, Notes, ECDL, Parts to Order 
       Reply  Tue Jul 2 17:40:22 2013, Chloe, Notes, ECDL, Parts to Order 
          Reply  Wed Jul 3 17:05:55 2013, Chloe, Notes, ECDL, Parts to Order 
             Reply  Mon Jul 8 18:00:12 2013, Chloe, Notes, ECDL, Parts to Order 
                Reply  Tue Jul 9 17:57:49 2013, Chloe, Notes, ECDL, Preparing for parts to arrive approximate.SLDPRTsketch_of_part.PNG
Message ID: 1217     Entry time: Fri Jun 28 17:59:15 2013     Reply to this: 1221
Author: Chloe 
Type: Notes 
Category: ECDL 
Subject: Parts to Order 

Yesterday I spent awhile reading literature, then met with Rana and Tara. Rana wanted us to produce a sketch of the physical layout of our ECDL and generate some graphs comparing different parameters (diodes, gratings, cavity lengths) so we could determine exactly what parameters we'd need to order parts. Last night I made the plots in Mathematica (BAD). This morning I did the sketch of the mechanical layout of the ECDL. Will make a nicer sketch with the changes made today and post here this weekend. 

I calculated a few values: the grating should be placed at an angle of 39.7 degrees in order for the first order diffraction go back into the cavity. I checked the tuning range, and concluded for a frequency change of 100 MHz - 4 GHz, we will see a change of output beam angle on the order of microradians. This means we will not need a mirror to make sure the output beam is directed correctly for frequency changes. 

Tara and I met with Rana again. I got mocked excessively for using Mathematica, and will remake all the plots in Matlab this weekend. We decided on some parts to order, which are listed at the end of this entry. Other things to do:

  • We want our apparatus to be in a metal box to lower noise. Will build inside the box. Check the 40m lab to see any metal boxes laying around, and check online (Newark, Allied). We want a setup with a lid that can be very rigidly screwed on. 
  • Ask Dmass about using the current driver in the Cryo lab. We don't want to have to order this online, it's expensive!
  • Talk to the companies that sell laser diodes to make sure that the laser diodes are precisely 1064 nm. If not, see if we can arrange something where they preselect a diode, since we need very high accuracy. 
  • We will design the TEC/current driver connections to the laser diode once we have parts, since it'll likely require some fiddling around and this is a prototype. We will prefer BNC cables to D-Sub. 
  • Eventually make some of the more unique parts of the apparatus in Solidworks so we can get it machined. 


Parts to order (bolded): 

1. Laser diodes: We plan to order 2, both are compatible with the diode mount. 
2. Laser diode mount: This has a built in TEC (Peltier element)

Thorlabs HLD001 ($464.10): accepts the 9 mm package, TEC max current of 3A, 10 kilo ohm thermistor (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=4135
3. TEC controller: We need to buy both a controller (compatible with mount) and the cable connector (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3355)
  • Thorlabs TLD001 ($750.00): controller output up to 200 mA
  • Thorlabs CAB400 ($66.00): cable connector, 9 pin D-Sub connector, 1.5 m long
4. Diffraction grating: Checked the messed up graphs from Mathematica and the efficiency being halved approximately halves the noise, and there isn't anything particularly weird going on here. 
Thorlabs GR25-1210 ($102.00): 1200 grooves/mm, 25x25x6mm, 1 um blaze (http://www.thorlabs.com/thorproduct.cfm?partnumber=GR25-1210)
The total estimated cost so far is $2394.54

This weekend I will:
  • remake all the plots in Matlab and post here
  • contact Thorlabs and QPhotonics about preselecting diodes that are almost exactly 1064 nm, figure this out so we can order ASAP (already sent them emails)
  • check with Dmass about a current driver in the Cryo lab that we can use
  • make a nice sketch of the layout and post here
  • update pdf with all progress made so far



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