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Old 04-07-2009, 05:05 PM #17
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Default Re: badly collimated he-ne

Quote:
Originally Posted by [ch1071
ebel]Tha's a nice Ole' hughes you got there ! Where did you get it ?
One of the companies I worked for as an electronics engineer used to throw out the tubes and power supplies on the returns if the lasers were below spec or flickered once in several hours. I took home a couple large boxes of the rejects, but that was a few years ago...


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Old 04-07-2009, 05:08 PM #18
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Default Re: badly collimated he-ne

Quote:
Originally Posted by Warske
[quote author=[ch1071]ebel link=1239052143/0#15 date=1239122743]Tha's a nice Ole' hughes you got there ! Where did you get it ?
One of the companies I worked for as an electronics engineer used to throw out the tubes and power supplies on the returns if the lasers were below spec or flickered once in several hours. *I took home a couple large boxes of the rejects, but that was a few years ago...[/quote]


What did you do with all of them ? I'm sure you could have made a nice profit had you sold them.

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Old 04-07-2009, 05:24 PM #19
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Default Re: badly collimated he-ne

Quote:
Originally Posted by Warske
[quote author=[ch1071]ebel link=1239052143/0#15 date=1239122743]Tha's a nice Ole' hughes you got there ! Where did you get it ?
One of the companies I worked for as an electronics engineer used to throw out the tubes and power supplies on the returns if the lasers were below spec or flickered once in several hours. *I took home a couple large boxes of the rejects, but that was a few years ago...[/quote]

dosnt this statement pretty much explain the problem
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Old 04-07-2009, 05:33 PM #20
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Default Re: badly collimated he-ne

Quote:
Originally Posted by Laserman532
[quote author=Warske link=1239052143/0#17 date=1239123941][quote author=[ch1071]ebel link=1239052143/0#15 date=1239122743]Tha's a nice Ole' hughes you got there ! Where did you get it ?
One of the companies I worked for as an electronics engineer used to throw out the tubes and power supplies on the returns if the lasers were below spec or flickered once in several hours. *I took home a couple large boxes of the rejects, but that was a few years ago...[/quote]

dosnt this statement pretty much explain the problem [/quote]


the problem of " Why did you not sell them " ?

Even if they were performing under their rated specs, some of them may still have worked pretty well and would have still been fit to sell.

Or is there another problem that I am missing ?

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Old 04-07-2009, 06:21 PM #21
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Default Re: badly collimated he-ne

there are always ways to adjust optics even if they are hard sealed, but mirror alignment isn't going to change the divergence. Even if it gets into a better mode with alignment the divergence won't be any better. It may appear to be better if your going from, say, tem01 back to tem00 just because the overall spot size is smaller; but mathematically the divergence shouldn't really change with mirror alignment.
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Old 04-07-2009, 09:48 PM #22
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Default Re: badly collimated he-ne

i have no chance to get into the cavity with hard-sealed tubes, i guess? so no way to put some extra brewster-mirror or some filter into the path, to have a lower-powered singlemode-he-ne? not that i would have optics with a low enough absorbance to not kill the low laser-gain completely.. ;-)

ah, i'll leave the tube closed, experiment with external recollimating, and will get a better collimated one if i ever feel to need it :-)

oh, and i need a 635nm diode now, of course! :-)

interesting stuff here!

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