User:Anthony Salvagno/Notebook/Research/2010/04/01/Laser Issues Resolved

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(Approach and Results)
(Approach and Results)
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{{qn}}Pranav and I looked into the laser issues we were having when the laser gets into higher power regimes (above 1W).  We noticed a while ago that the beam looked more or less like a donut indicating higher order modes at higher powers.  Koch figured it might have to do with heating so we looked into it.
{{qn}}Pranav and I looked into the laser issues we were having when the laser gets into higher power regimes (above 1W).  We noticed a while ago that the beam looked more or less like a donut indicating higher order modes at higher powers.  Koch figured it might have to do with heating so we looked into it.
==Approach and Results==
==Approach and Results==
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We wanted to check how the laser reacts when cooled and when hot.  We let the laser get hot and took pictures every half watt from 1W up to 4W.  We then took an aluminum block that we stored in the freezer and put it on the laser.  We allowed the laser to cool for about 5 min and then repeated the picture taking process with the block on the laser.  In between the two processes, we took pictures with the laser stable at 4W and adjusted the AOM to make sure it wasn't an AOM issue.  We took an image every volt starting at 2V up to 5V.  Those images can be seen below with captions about each picture.
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We wanted to check how the laser reacts when cooled and when hot.  We let the laser get hot and took pictures every half watt from 1W up to 4W.  We then took an aluminum block that we stored in the freezer and put it on the laser.  We allowed the laser to cool for about 5 min and then repeated the picture taking process with the block on the laser.  In between the two processes, we took pictures with the laser stable at 4W and adjusted the AOM to make sure it wasn't an AOM issue.  We took an image every volt starting at 2V up to 5V.  Those images can be seen below with captions about each picture.<br>
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<html><embed type="application/x-shockwave-flash" src="http://picasaweb.google.com/s/c/bin/slideshow.swf" width="600" height="400" flashvars="host=picasaweb.google.com&captions=1&hl=en_US&feat=flashalbum&RGB=0x000000&feed=http%3A%2F%2Fpicasaweb.google.com%2Fdata%2Ffeed%2Fapi%2Fuser%2Fanthonysalvagno%2Falbumid%2F5455280471248619521%3Falt%3Drss%26kind%3Dphoto%26hl%3Den_US" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></html><br>
It is quite remarkable flipping through the images quickly you can see the "hole" in the laser intensity become more prominent and then when it is cooled you can see it looks good.  Also it is startling to see the two images side-by-side at the end with their respective beam profiles.  Pretty cool stuff.
It is quite remarkable flipping through the images quickly you can see the "hole" in the laser intensity become more prominent and then when it is cooled you can see it looks good.  Also it is startling to see the two images side-by-side at the end with their respective beam profiles.  Pretty cool stuff.
==Further Testing Tomorrow==
==Further Testing Tomorrow==

Revision as of 17:56, 1 April 2010

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Pranav and I looked into the laser issues we were having when the laser gets into higher power regimes (above 1W). We noticed a while ago that the beam looked more or less like a donut indicating higher order modes at higher powers. Koch figured it might have to do with heating so we looked into it.

Approach and Results

We wanted to check how the laser reacts when cooled and when hot. We let the laser get hot and took pictures every half watt from 1W up to 4W. We then took an aluminum block that we stored in the freezer and put it on the laser. We allowed the laser to cool for about 5 min and then repeated the picture taking process with the block on the laser. In between the two processes, we took pictures with the laser stable at 4W and adjusted the AOM to make sure it wasn't an AOM issue. We took an image every volt starting at 2V up to 5V. Those images can be seen below with captions about each picture.

It is quite remarkable flipping through the images quickly you can see the "hole" in the laser intensity become more prominent and then when it is cooled you can see it looks good. Also it is startling to see the two images side-by-side at the end with their respective beam profiles. Pretty cool stuff.

Further Testing Tomorrow

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