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Entry  Tue Mar 22 00:03:29 2011, Bryan, Configuration, Green Locking, PSL vs Y arm laser temperature pairing PSL_vs_Y_arm_Temperatures.png
    Reply  Tue Mar 22 00:23:20 2011, Jenne, Configuration, Green Locking, PSL vs Y arm laser temperature pairing 
       Reply  Tue Mar 22 19:03:45 2011, Bryan, Configuration, Green Locking, PSL vs Y arm laser temperature pairing 
          Reply  Thu Mar 24 15:30:59 2011, Bryan, Configuration, Green Locking, PSL vs Y arm laser temperature pairing Temp_Beating_Day02_html_m2d719182.jpg
             Reply  Thu Mar 24 16:33:32 2011, Bryan, Configuration, Green Locking, PSL vs Y arm laser temperature pairing PSL_vs_X-end_T_data_fine.jpg
Message ID: 4439     Entry time: Thu Mar 24 15:30:59 2011     In reply to: 4425     Reply to this: 4440
Author: Bryan 
Type: Configuration 
Category: Green Locking 
Subject: PSL vs Y arm laser temperature pairing 
Fine-grained temperature vs temperature data around the current operating point of the PSL laser.
 
The last set of data was taken in 1 degreeC steps, but we want a bit more detail to find out what happens around the current PSL operating point. So we took some data with a 0.1 degC resolution.

The good news is that we seem to be running in a linear region of the PSL laser with a degree or so of range before the PSL Innolight laser starts to run multi-mode. On the attached graph we are currently running the PSL at 32.26degrees (measured) which puts us in the lower left corner of the plot. The blue data is the Lightwave set temperature (taken from the display on the laser controller) and the red data is the Lightwave laser crystal measured temperature (taken from the 10V/degC calibrated diagnostic output on the back of the laser controller - between pins 2 and 4).

The other good news is that we can see the transition between the PSL laser running in one mode and running in the next mode along. The transition region has no data points because the PMC has trouble locking on the multi-mode laser output - you can tell when this is happening because, as we approach the transition the PMC transmitted power starts to drop off and comes back up again once we're into the next mode region (top left portion of the plot).

 

The fitted lines for the region we're operating in are:

Y_arm_Temp_meas = 0.95152*T_PSL + 3.8672

Y_arm_Temp_set = 0.87326*T_PSL + 6.9825

Temp_Beating_Day02_html_m2d719182.jpg

 

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