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Entry  Thu Aug 1 03:34:35 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 
    Reply  Thu Aug 1 18:33:12 2013, Chloe, DailyProgress, ECDL, Assembling ECDL tempsensor.PNG
       Reply  Fri Aug 2 18:15:06 2013, Chloe, DailyProgress, ECDL, Assembling ECDL possible_tec_mount.PNG
          Reply  Mon Aug 5 18:47:04 2013, Chloe, DailyProgress, ECDL, Assembling ECDL heating.PNGcooling.PNGnoise_beginning.JPG
             Reply  Tue Aug 6 19:48:19 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 100_0079.JPG
                Reply  Wed Aug 7 18:13:21 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 
                   Reply  Thu Aug 8 18:43:44 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 100_0081.JPGcool_bridge.PNGheat_bridge.PNG
                      Reply  Fri Aug 9 18:01:47 2013, Chloe, DailyProgress, ECDL, Assembling ECDL cool_bridge2.PNGheat_bridge2.PNG
                         Reply  Tue Aug 13 18:13:35 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 
                            Reply  Thu Aug 15 18:53:45 2013, Chloe, DailyProgress, ECDL, Assembling ECDL 100_0104.JPG
Message ID: 1281     Entry time: Mon Aug 5 18:47:04 2013     In reply to: 1277     Reply to this: 1283
Author: Chloe 
Type: DailyProgress 
Category: ECDL 
Subject: Assembling ECDL 

 I brought in a different USB drive to get data off of the oscilloscope. It took awhile to figure out how to capture the data with the best settings. I have a sample graph of the heating and cooling of the diode mount attached (converted to temperature using datasheet for 10k thermistor). Notice that I took data over about 4 degrees, so that it was possible to see the change in voltage as the temperature changed. Even then, it would be nice to have more resolution on this data. I cannot make the voltage increments smaller than 500 mV because the offset of the oscilloscope isn't enough to still see the data (I tried). I will talk to Tara tomorrow about if I can get better data on this to analyze, since this data has poor resolution. 

heating.PNG

cooling.PNG

 Tara asked me to try to calculate the free running noise of the laser diode to have an estimate for when we actually collect this data. We will be using a Michelson interferometer with different arm lengths. I used Erica's past elog entry as a starting point (1241) and wrote a bit more explanation into my own calculations so it will be clear to me in the future and to make sure I understood everything. However, I'm unsure of how to incorporate the noise levels after calculating the power received by the photodiode, and I need to talk to Tara about how to do this tomorrow if he's around. The calculations that I have done are attached. 

noise_beginning.JPG

 

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