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Entry  Tue Dec 4 19:34:22 2018, awade, DailyProgress, WOPO, Diabolo 532 nm power drop and retuning 18-12-04_DiaboloInside_annotate.jpegplot20181204_DiaboloSHGRaligned1064nm.pdfplot20181204_DiaboloSHGRErrSig.pdf20181204_RetuneDiaboloSHGAlignment.zip
    Reply  Thu Dec 6 20:04:50 2018, awade, DailyProgress, WOPO, Diabolo 532 nm power drop and retuning 
       Reply  Fri Dec 7 20:31:06 2018, awade, DailyProgress, WOPO, Diabolo: cleaning dust out of SHG unit, self heating issues 18-12-07_20-06-46_4774.jpg18-12-07_20-06-58_4776.jpg18-12-07_20-07-44_4780.jpgIMG_4785.JPGIMG_4766.MOV
          Reply  Thu Dec 13 14:01:13 2018, awade, DailyProgress, WOPO, Diabolo: contacted coherent 
             Reply  Thu Dec 13 16:24:06 2018, awade, DailyProgress, WOPO, Diabolo: baseline numbers for coherent plot20181218_PhaseMatchingCurveFastScanDiaboloSHG.pdf20181213_SHGScanWithLNTempTuning.zip
                Reply  Wed Dec 19 16:48:18 2018, awade, DailyProgress, WOPO, Diabolo: baseline numbers for coherent 
                   Reply  Thu Dec 20 19:20:50 2018, awade, DailyProgress, WOPO, Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked plot20181220_SHGLockedOutputVsOvenSetpointTemperature.pdf20181220_SHGLockedPowerVsSetPointTemp.zip
                      Reply  Fri Dec 21 15:33:26 2018, Koji, DailyProgress, WOPO, Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked 
                         Reply  Fri Dec 21 15:51:27 2018, awade, DailyProgress, WOPO, Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked 
                      Reply  Mon Dec 24 10:08:49 2018, awade, DailyProgress, WOPO, Diabolo: back to power with deliberate pre-misalignment 18-12-21_22-04-30_4812.jpg18-12-21_22-04-54_4813.jpg18-12-21_22-07-55_4814.jpg
                         Reply  Mon Dec 24 12:07:18 2018, Koji, DailyProgress, WOPO, Diabolo: back to power with deliberate pre-misalignment 
Message ID: 2281     Entry time: Thu Dec 13 16:24:06 2018     In reply to: 2280     Reply to this: 2283
Author: awade 
Type: DailyProgress 
Category: WOPO 
Subject: Diabolo: baseline numbers for coherent 

Some numbers for the Diabolo laser for reference (to quote to Coherent, if they get back to us with help).

Diabolo numbers (Dec 13, 2018)
Parameter Value
Fundamental (1064 nm) laser power exiting laser from tap off BS 372 ± 2 mW
Fundamental (1064 nm) incident on SHG (measured after steering mirror 1) 1.32 ± 0.02 W
Total fundamental (summed from above two mesurements) 1.692 ± 0.02W
SHG cavity scan TEM00 peak (voltage trans diode) 1.21 V (1 MΩ imp oscilloscope)
SHG cavity scan second HOM peak 38 mV (1 MΩ imp)
SHG cavity scan third HOM peak 17 mV (1 MΩ imp)

 

To characterize the phase matching temperature I fast scanned the SHG and measured the peak 532 nm output for a range of temperatures in 0.05 C steps.  Acoss a single sweep of the cavity resonances there is some change in the peak 532 nm output.  This change accross the sweep range is likely an alignment thing with the shape of the PZT sweep path.  Plot below shows the peak 532 nm output power measured on a Thorlabs PD (PDA100A, 0 dB gain with 1.3 ND filter in front). Vertical axis units are less relivant than the shape and peak possition of the curve.  Error bars were estimated based on spread of peak amplitudes (the largest error in the mearument).

We see a peak conversion at 109.8 C with a FWHM of about 0.2 C

I've attached data and python notebook for plotting in a zip below.

 

Quote:

I've contacted the people at Coherent about getting instructions for repair or whether they can still service this unit as I don't want to waste a lot of futile time on trying to optimize a unit that might be broken/degraded.

The technicians I spoke to didn't seem to know a lot about the Diabolo unit but will forward on to their manufacture for further information/assistance.

 

Attachment 1: plot20181218_PhaseMatchingCurveFastScanDiaboloSHG.pdf  55 kB  Uploaded Wed Dec 19 17:59:10 2018  | Hide | Hide all
plot20181218_PhaseMatchingCurveFastScanDiaboloSHG.pdf
Attachment 2: 20181213_SHGScanWithLNTempTuning.zip  6 kB  Uploaded Wed Dec 19 18:01:13 2018
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