40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Mon Apr 12 19:50:30 2010, Aidan, Summary, Green Locking, Temperature sweep of the Lightwave: df/dT = 2.8GHz/K LightWave_temp_sweep.pdfLightWave_Temp.m
    Reply  Mon Apr 12 20:48:51 2010, Aidan, Mott, Summary, Green Locking, Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K Innolight_temp_sweep.pdfInnolight_Temp.m
       Reply  Tue Apr 13 12:39:51 2010, Aidan, Mott, Summary, Green Locking, Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K 
Message ID: 2794     Entry time: Mon Apr 12 20:48:51 2010     In reply to: 2793     Reply to this: 2797
Author: Aidan, Mott 
Type: Summary 
Category: Green Locking 
Subject: Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K 

Quote:

The beams from the Innolight and Lightwave NPROs were both incident on a 1GHZ New Focus PD. Mott and I swept the temperature of the Lightwave and tracked the change in frequency of the beatnote between the two. The Innolight temperature was set to 39.61C although the actual temperature was reported to be 39.62C.

Freq. vs temperature is plotted below in the attached PDF. The slope is 2.8GHz/K.

The data is in the attached MATLAB file.

 Same thing for the Innolight Mephisto.

Not unexpected values with dn/dT around 11E-6 K^-1 and coefficient of thermal expansion = 8E-6 K^-1 and a laser resonator length of order 10cm.

Attachment 1: Innolight_temp_sweep.pdf  4 kB  | Show | Hide all | Show all
Attachment 2: Innolight_Temp.m  753 Bytes  | Hide | Hide all | Show all
% plot the data from the Innolight Temperature sweep

% Innolight temperature

InnTemp = [0.60
    .59
    .56
    .52
    .65] + 39;

... 25 more lines ...
ELOG V3.1.3-