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Question about my dot

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NyteMunkey
4.99mW Green Laser Toy

Joined: 28 Jun 2008
Posts: 1

Posted: 6/28/08, 1:37 AM Post subject: Question a

This isn't really a technical question I just want to know if I'm right. The dot on my 75mw laser pointer is distorted. When pointing it there seems to be an "X" that crosses through my dot. It's not a clearly defined X rather 3 or 4 lines on each crossing. Does this sound like a scratched lens? I don't think a dirty lens would produce such a dot. I have yet to pick up a microfiber cloth to clean with Any reply would be great. Thanks

Bluefan
Elite Laser

Joined: 20 Apr 2008
Posts: 226
Movie(s): 1

Posted: 6/28/08, 3:30 AM Post subject:

Post a picture if possible. And cleaning it with such a cloth could be useful, it migt just be dust.

chargerman
Wicked Lasers God

Joined: 08 Sep 2005
Posts: 1721
Movie(s): 2
Location: Big Horn Mountains, Wyoming

Posted: 6/28/08, 12:24 PM Post subject:

Welcome to the forum N.M.....That does sound like a dirty lens. Clean it very gently with a MICROFIBER cloth. _________________ Best Regards Chargerman Great divergence calculator http://www.pseudonomen.com/lasers/calculators/

Vic
Wicked Lasers God

Joined: 30 Oct 2006
Posts: 2005
Picture(s): 66
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Location: United States, CA, Los Angeles

Posted: 7/02/08, 8:58 AM Post subject:

It coud be your laser in different TEM modes, from keeping your laser on too long. _________________ WL Fusion 125mW All-Black W/Clip 1.0252621079 mRad Match Burn: 3-4 seconds @ 1ft. Paper Burn: 1-2 seconds to make a hole @ 2 ft Electric Tape Cut: 5 seconds to cut, burns hole instantly. Balloon Pop: Don\''\''t have any balloons ): Smoke anything Soft&Black: Instantly! Sting your Skin: Instantly! Visit: http://www.youtube.com/uwrotciv to experience the power of a Fusion before you buy a laser!!!! My Homemade Collimator: http://www.lasercommunity.com/lc_view_project.php?aid=16 http://www.instructables.com/id/Home-Made-Collimator/

Bluefan
Elite Laser

Joined: 20 Apr 2008
Posts: 226
Movie(s): 1

Posted: 7/02/08, 2:09 PM Post subject:

Just wondering: ow could having your laser on too long cause mode hopping? Anyway, a picture still is the best. It could be anything from dirt to a damaged coating.

Athoul
Wicked Lasers God

Joined: 13 Sep 2005
Posts: 7503
Location: Canada

Posted: 7/02/08, 3:52 PM Post subject:

Bluefan wrote:

Just wondering: ow could having your laser on too long cause mode hopping? Anyway, a picture still is the best. It could be anything from dirt to a damaged coating.

Definately sounds like either a dirty lens or mode hopping. The easiest to fix is cleaning the lens by the mentioned methods. Mode hopping is not so easy to resolve.

Leaving the laser on for too long can cause mode hopping as the temperature of the crystals rise.
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