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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: 1227     Entry time: Mon Jul 8 18:00:12 2013     In reply to: 1225     Reply to this: 1230
Author: Chloe 
Type: Notes 
Category: ECDL 
Subject: Parts to Order 

I made more edits to my SURF progress report. I need to remember to make good looking graphs in Matlab without being reminded by Tara. I just submitted the pdf of the final version. It is also on the SVN in the ECDL documents folder. 

I spent more time trying to understand the difference between heterodyne and homodyne detection, and trying to figure out which method I would want to use for my ECDL measurements. My understanding is that homodyne detection involves superimposing the output beam with a modified version of itself, and measuring the beat frequency spectrum. Heterodyne detection involves superimposing the ECDL signal with a reference signal and measuring the beat frequency spectrum. I believe we will be using heterodyne detection because we have a very good reference laser at 1064 nm and this saves the trouble of having to modify the output beam. However, the literature has not been super descriptive for a beginner, and the exact mechanism of making this happen still confuses me. I will continue looking into this. 

I also spent some time figuring out how we will wire the TEC and TEC controller. It seems fairly straightforward. See http://www.thorlabs.com/Thorcat/15900/TED200C-Manual.pdf, page 13. This explains how we will wire things. We will use an LED that can signal to us when the TEC element is on. I still need to figure out the thermistor we will use as a temperature sensor... 

For future reference, the 2 parts that Tara ordered are:

  • laser controller: Thorlabs TEC200C
  • Peltier element: Thorlabs TEC3-2.5
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