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Message ID: 140     Entry time: Tue Jun 23 19:16:53 2009
Author: Michelle Stephens, Connor Mooney 
Type: Laser 
Category: Fiber 
Subject: Calibration of FS NPRO output power vs drive current 

We measured the output of the FS NPRO Laser at drive currents between 1 and 2.4 A, with 0.1A imcrements. The OPHIR powermeter was used with a 50W head, and was set to the 0.8W-6W range. The model is L50A-SH. We took two sets of measurements. For the first, the curve found was non-linear, starting off shallow, then becoming steeper, and finally levelling off. We weren't sure why the curve exhibited this behavior and we took a second set of measurements to verify our results. For the second set, we took the maximum and minimum values of the power fluctuations at each current. We found an average power from these values and generated error bars.

 

C = [1.002 1.101 1.201 1.301 1.400 1.501 1.600 1.701 1.801 1.901 2.00 2.100 2.200 2.301 2.384];
Pd = [6 46 94 154 225 301 398 501 625 759 870 978 1062 1131 1191];
Pu = [9 49 98 158 229 312 405 514 679 772 890 985 1068 1140 1198];

C is an array of the current values in Amperes.

Pd and Pu are the lower and upper bounds of power ouptut , in milliwatts, measured  at the power meter.

The directory in which the above data was analyzed is /users/cmooney/power2.m

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