40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Thu Jun 20 17:23:40 2013, Chloe, DailyProgress, ECDL, Noise Calculations saito.pdfpsd_noise.png
    Reply  Fri Jun 21 16:47:30 2013, Chloe, DailyProgress, ECDL, Noise Calculations Noise.pdf
       Reply  Mon Jun 24 11:14:04 2013, Chloe, DailyProgress, ECDL, Noise Calculations Noise.pdf
          Reply  Mon Jun 24 17:48:30 2013, Chloe, DailyProgress, ECDL, Noise Calculations Noise.pdf
             Reply  Tue Jun 25 14:14:17 2013, rana, DailyProgress, ECDL, Noise Calculations 
                Reply  Tue Jun 25 17:51:34 2013, Chloe, DailyProgress, ECDL, Noise Calculations Noise2.pdf
                   Reply  Wed Jun 26 17:13:21 2013, Chloe, DailyProgress, ECDL, Noise Calculations Noise2.pdf
                      Reply  Fri Jun 28 14:52:11 2013, tara, Notes, ECDL, laser noise requirement for locking to a refcav 
                      Reply  Sun Jun 30 22:58:45 2013, Chloe, DailyProgress, ECDL, Noise Calculations compare_experiments.pngcompare_diodes.pngcompare_gratings.pngcompare_length.png100_0068.JPG
Message ID: 1206     Entry time: Mon Jun 24 11:14:04 2013     In reply to: 1202     Reply to this: 1207
Author: Chloe 
Type: DailyProgress 
Category: ECDL 
Subject: Noise Calculations 

Quote:

Today, I wrote up my noise calculations in a nicer way so that I have it on hand in the future. They are attached here. I found a mistake from the last elog entry, so it turns out that we are looking at a linewidth of about 440 kHz (or a PSD noise of 191 Hz/rtHz). This still meets the requirements of the experiment, and can be adjusted as necessary, since I can still increase the length of the cavity to decrease the noise. 

 There was another mistake in my calculations (sorry!) so we are actually looking at a possible linewidth of about 5.3 kHz (or noise level of 0.03 Hz/rtHz). This is very low, so we are looking at using a current driver from Thorlabs since we have room in our noise budget, and this would make the assembly much easier since the parts fit together. Waiting for a response from Thorlabs about their noise levels for current drivers.

Attached are the corrected calculations. 

Attachment 1: Noise.pdf  121 kB  | Hide | Hide all
Noise.pdf Noise.pdf Noise.pdf
ELOG V3.1.3-