40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  Cryo Lab eLog  Not logged in ELOG logo
Entry  Fri Feb 19 14:14:29 2021, shruti, Notes, Laser, Power vs. Temperature plots for Rio PLANEX PvsT_20210219.zipPvsT.pdf
    Reply  Fri Feb 19 14:46:04 2021, rana, Notes, Laser, Power vs. Temperature plots for Rio PLANEX 
       Reply  Fri Feb 19 22:01:44 2021, aaron, Notes, Laser, Power vs. Temperature plots for Rio PLANEX 
    Reply  Mon Mar 15 12:11:51 2021, shruti, Notes, Laser, Power vs. Temperature plots for Rio PLANEX South.pdfRtoT.pdfSouthData.zip
Message ID: 2658     Entry time: Fri Feb 19 14:14:29 2021     Reply to this: 2662   2683
Author: shruti 
Type: Notes 
Category: Laser 
Subject: Power vs. Temperature plots for Rio PLANEX 
I turned on the temperature control and TEC for the North laser with the TED 200C laser controller to measure the power dependence on temperature.
The power was measured right after the fiber launch. Laser -> Faraday Isolator -> Intensity modulator -> 90% PO -> Fiber launch
 

The data and code for plotting is in Attachment 1.

The plot is in Attachment 2.
While the sensor resistance decreased (corresponding to an increase in the laser temperature) an abrupt decrease in power was seen at 8.72 \pm 0.01 kOhms [close to 28 C];
When decreasing the temperature (measured by an increasing sensor resistance) an abrupt increase in measured power was seen at 10.23 \pm 0.01 kOhms [close to 24 C].

The two sensor resistance values for abrupt power change was determined visually from the graph.

 

Attachment 1: PvsT_20210219.zip  37 kB
Attachment 2: PvsT.pdf  17 kB  | Hide | Hide all
PvsT.pdf
ELOG V3.1.3-