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Entry  Thu Apr 14 17:30:18 2016, ericq, Update, General, PLL measurement ongoing 
    Reply  Fri Apr 15 03:02:44 2016, ericq, Update, General, New AUX laser measurements aux_innolight_freqPSD.pdfaux_innolight_AMPM.pdfaux_innolight_data.zip
       Reply  Fri Apr 15 18:35:57 2016, gautam, Update, General, New AUX laser measurements PSL_AUX_TEMP_SCAN.pdfPSL_AUX_TEMP_SCAN.mat
          Reply  Fri Apr 15 23:11:49 2016, gautam, Update, General, Innolight 1W moved to SP table 
             Reply  Mon Apr 18 00:29:00 2016, gautam, Update, General, Beam profiling + injection current scan 6x
Message ID: 12081     Entry time: Mon Apr 18 00:29:00 2016     In reply to: 12080
Author: gautam 
Type: Update 
Category: General 
Subject: Beam profiling + injection current scan 


I've finished up the remaining characterization of the repaired 1W Innolight NPRO - the beamscan yielded results that are consistent with an earlier beam-profiling and also the numbers in the datasheet. The output power vs diode current plot is mainly for diagnostic purposes in the future - so the plot itself doesn't signify anything, but I'm uploading the data here for future reference. The methodology and analysis framework for the beamscan is the same as was used here.

Attachment #1 - Beam-scan results for X-direction

Attachment #2 - Beam-scan results for Y-direction

Attachment #3 - Beam profile using fitted beam radii

Attachment #4 - Beam-scan data

Attachment #5 - Output power vs Injection current plot

Even though I remember operating at a diode current of 2.1A at some point in the past, while doing this scan, attempting to increase the current above 2.07A resulted in the "Clamp" LED on the front turning on. According to the manual, this means that the internal current limiting circuitry has kicked in. But I don't think this is a problem as we don't really even need 1W of output power. This is probably an indicator of the health of the diode as well?

Attachment #6 - Output power vs Injection current data

It remains to redo the mode-matching into the doubling oven and make slight modifications to the layout to accommodate the new laser + beam profile. 

I plan to do these in the morning tomorrow, and unless there are any objections, I will begin installing the repaired 1W Innolight Mephisto on the X endtable tomorrow (18 April 2016) afternoon. 

Attachment 1: BeamScan_x.pdf  53 kB  | Hide | Hide all
Attachment 2: BeamScan_y.pdf  52 kB  | Hide | Hide all
Attachment 3: ZScan.pdf  106 kB  | Hide | Hide all
Attachment 4: BeamScan.mat  3 kB
Attachment 5: Innolight_Current_Scan.pdf  34 kB  | Hide | Hide all
Attachment 6: Innolight_Current_Scan.mat  585 Bytes
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