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Old 05-11-2010, 04:01 PM #1
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Default Dirty HeNe Dot

My HeNe's dot looks like this:

http://devcrate.com/laser/photos/HeNe/0511001125.jpg

Is this a function of polarization or is the end of the tube dirty? Or something else?

Thanks!

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Old 05-11-2010, 04:36 PM #2
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Default Re: Dirty HeNe Dot

Some "speckle" is normal with laser light. However, that looks like a dirty mirror

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Old 05-11-2010, 05:30 PM #3
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Default Re: Dirty HeNe Dot

Quote:
Originally Posted by daguin View Post
Some "speckle" is normal with laser light. However, that looks like a dirty mirror

Peace,
dave
Well, I used 91% isopropanyl and a microfiber cloth and got off some crap that was on the mirror. There's two very tiny dings (not scratches) that remain after I cleaned it. I'm not sure if I created them during cleaning or if they were already there.

It now looks like this: http://devcrate.com/laser/photos/HeNe/0511001320.jpg

This laser was given to my friend's high school from a VCU medical research lab, his physics teacher passed it on to him, and he passed it on to me because he had no use for it. I figure VCU must've gotten rid of it for *some* reason.

Made a pretty rookie mistake while cleaning it and got bit pretty bad by the caps in the power supply. Lesson learned.

-Trevor
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Old 05-11-2010, 05:46 PM #4
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Default Re: Dirty HeNe Dot

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Originally Posted by twhite828 View Post
Well, I used 91% isopropanyl and a microfiber cloth and got off some crap that was on the mirror. There's two very tiny dings (not scratches) that remain after I cleaned it. I'm not sure if I created them during cleaning or if they were already there.

It now looks like this: http://devcrate.com/laser/photos/HeNe/0511001320.jpg
This laser was given to my friend's high school from a VCU medical research lab, his physics teacher passed it on to him, and he passed it on to me because he had no use for it. I figure VCU must've gotten rid of it for *some* reason.
Made a pretty rookie mistake while cleaning it and got bit pretty bad by the caps in the power supply. Lesson learned.
-Trevor
Well -- It's better

It is pretty tough to chip a mirror by cleaning it. Residue is the more likely culprit. It is also possible (but not as likely) that the "deposit", on the mirror, is inside the laser. However, since the first cleaning improved it, I would suggest some lens cleaning fluid and a lens cloth. Sometimes the cloth gets contaminated at a level we cannot see with the naked eye. Lastly I'm not sure what ispropanyl is, but if you are referring to isopropyl alcohol, it is not really designed to clean glass.

Keep in mind that the tube itself also acts as a capacitor. It can bite you even after it is unplugged from the PSU

Peace,
dave
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Old 05-11-2010, 06:01 PM #5
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Default Re: Dirty HeNe Dot

Quote:
Originally Posted by daguin View Post
Well -- It's better

It is pretty tough to chip a mirror by cleaning it. Residue is the more likely culprit. It is also possible (but not as likely) that the "deposit", on the mirror, is inside the laser. However, since the first cleaning improved it, I would suggest some lens cleaning fluid and a lens cloth. Sometimes the cloth gets contaminated at a level we cannot see with the naked eye. Lastly I'm not sure what ispropanyl is, but if you are referring to isopropyl alcohol, it is not really designed to clean glass.

Keep in mind that the tube itself also acts as a capacitor. It can bite you even after it is unplugged from the PSU

Peace,
dave
I think my dad has lens cleaning fluid in a camera bag somewhere, but it's probably from the 70's, so I'll grab some new stuff and a good cloth. I used alcohol because it evaporates nearly completely. I guess I'll open it up again and give it a better go, since it *is* glass, and isn't AR coated on the outer surface.

It was plugged in when I was working with the mirror with my cloth, and my finger touched the contact. Like I said - rookie mistake, lesson learned.

-Trevor
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Old 05-13-2010, 11:58 AM #6
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Default Re: Dirty HeNe Dot

I use Isopropyl alcohol (the 99% kind) to clean lenses and it does a good job removing oils from sticky fingers. It does a good job also on primary mirrors and does not leave a film on it. I wouldn't use it on exprensive coated optics too much, although I have used it on a splitting cube with no ill effect.

To avoid getting zapped by HV caps and assemblies, I have a plain alligator clip wire with a 1 megohm resistor in the middle, and I just clip one end on the cap (or hv supply) and the other to ground. Much better than just shorting directly (caps don't like that in the long run).

- Robert
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Old 05-13-2010, 02:13 PM #7
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Default Re: Dirty HeNe Dot

Laserwave UK - for all your lasershow hardware

Look under "Other components", and consider getting a bottle of the First Contact optic cleaner. You apply it as a liquid, then it dries into a film, which you peel off.
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Old 05-13-2010, 03:15 PM #8
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Default Re: Dirty HeNe Dot

Also, must be considered what can be that dirt the mirrors ..... not all the things are soluble in alcohol

Alcohol is a lipides solvent, but some substances can require different solvents (also just water .....)
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