Old 06-14-2011, 10:47 PM #1
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Weird "Dust?" around the DOT

Hey..

When u point with my laserpointer to a wall,theres the dot and around it there weird things which looks like dust..

What is it and how to remove it?

(Many small white points)



Last edited by Fremo; 06-14-2011 at 10:55 PM.
Fremo is offline   Reply With Quote


















Old 06-14-2011, 11:03 PM #2
lazerman121's Avatar
Class 3R Laser
 
Join Date: Dec 2009
Location: Richmond Virginia
Posts: 1,358
Rep Power: 215096
lazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond repute
lazerman121 lazerman121 is online now
Class 3R Laser
lazerman121's Avatar
 
Join Date: Dec 2009
Location: Richmond Virginia
Posts: 1,358
Rep Power: 215096
lazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond reputelazerman121 has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

What wavelength of laser?
What power?
and can you post some pictures.
__________________
ONLY JESUS SAVES

405nm violet(blue-ray) laser-eBay
441.9nm DIY Build
445nm 80mW NDB7242E DIY build
473nm 10mW LSR473NL series blue laser module www.lasever.com Review
488nm 5mW Novalux Protera DPSS Laboratory Unit Review
515nm 20mW module
532nm 200mW Suwtech Lab laser
532nm 100mW Suwtech Lab laser

543.5nm .5mW Research Electro-optics Inc Helium Neon
561nm 4.98mW CNI GLP OEM module Review
593.5nm 100mW CNI Lab Dead driver
604nm LHOR-0150 2nd line
612nm 2.1mW LHOR-0150
632.8nm Melles Griot Bare Tube (05-LHR-004-347)
632.8nm .4mW Spectra Physics 155 HeNe
Sold
635nm 15mW Module
650nm 5mW red
1 Laservision Style F12.T5H04.5000 (O_O)

IR filters FS
lazerman121 is online now   Reply With Quote
Old 06-14-2011, 11:05 PM #3
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Re: Weird "Dust?" around the DOT

650nm
250mW

Dont have pictures,sorry

Its just the dot and around it many many many smallllllllllllll points (looks like snow/dust xD)
Fremo is offline   Reply With Quote
Old 06-14-2011, 11:12 PM #4
Asherz's Avatar
Class 3R Laser
 
Join Date: Jan 2009
Location: United Kingdom
Posts: 1,627
Rep Power: 65
Asherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond repute
Asherz Asherz is offline
Class 3R Laser
Asherz's Avatar
 
Join Date: Jan 2009
Location: United Kingdom
Posts: 1,627
Rep Power: 65
Asherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond reputeAsherz has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

You've probably burned something closed to the lens and some soot or dirt has got on the lens.

If you can get to the lens blow some air onto it with an pressurised air canister, or use your lungs.

If that doesn't work get a cotton Q-tip and give it a careful wipe.

That should clean it up.
__________________
- 150mW Ehgemus Mini-RPL Review -

Collection of the Best Free games

445nm Custom build@1A - Old style Dorcy Jr. + purple anodized heatsink
Dino Direct 50mW Flashlight unit
DX True green 100mW
O-like module @ 171mW in Mini-RPL host
Single-line Argon @ 52mW 488nm Peak
PHR-803T @ 110mA in Jayrob MXDL host
DX Red 660nm 200mW
Dragon lasers 190nm-548nm Safety Goggles
Asherz is offline   Reply With Quote
Old 06-15-2011, 12:00 AM #5
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Re: Weird "Dust?" around the DOT

found a good picture..here

Fremo is offline   Reply With Quote
Old 06-15-2011, 12:04 AM #6
Wolfman29's Avatar
Class 3B Laser
 
Join Date: Jan 2011
Location: Davis, CA
Posts: 3,828
Rep Power: 228
Wolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond repute
Wolfman29 Wolfman29 is offline
Class 3B Laser
Wolfman29's Avatar
 
Join Date: Jan 2011
Location: Davis, CA
Posts: 3,828
Rep Power: 228
Wolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond reputeWolfman29 has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

Both of my red lasers have the same thing. And it's not a lens artifact that can be cleaned, because I have repeatedly cleaned all my lens, and further, you can tell the lens artifacts (squiggly lines on the unfocused dot) from these.

I have a feeling it has something do with with it being open can....

It may also have something to do with not using an AR coated lens? Anyone know?
Wolfman29 is offline   Reply With Quote
Old 06-15-2011, 02:14 AM #7
ARG's Avatar
ARG ARG is offline
Class 4 Laser
 
Join Date: Feb 2011
Location: Canada
Posts: 6,987
Rep Power: 7765
ARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond repute
ARG ARG is offline
Class 4 Laser
ARG's Avatar
 
Join Date: Feb 2011
Location: Canada
Posts: 6,987
Rep Power: 7765
ARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond reputeARG has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

Quote:
Originally Posted by Wolfman29 View Post

I have a feeling it has something do with with it being open can....

It may also have something to do with not using an AR coated lens? Anyone know?
I just tested both my reds, one open can, one not, and the open can diode laser had a similar "dust effect" to the OP's. (May have been because the lens was dirty, I don't use my open can red that often.)

Last edited by ARG; 06-15-2011 at 02:20 AM.
ARG is offline   Reply With Quote
Old 06-15-2011, 04:27 AM #8
RayBurne's Avatar
Member
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
RayBurne RayBurne is offline
Member
RayBurne's Avatar
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
Default Re: Weird "Dust?" around the DOT

If cleaning the diode does not work, it may not be a dust problem.
" In the focus of a diffraction-limited beam (i.e., at the location where the beam radius reaches its minimum), the optical wavefronts are flat. Any scrambling of the wavefronts, e.g. due to optical components with poor quality, spherical aberrations of lenses, thermal effects in a gain medium, diffraction at apertures, or by parasitic reflections, can spoil the beam quality. For monochromatic beams, the beam quality could in principle be restored e.g. with a phase mask which exactly compensates the wavefront distortions, but this is usually difficult in practice, even in cases where the distortions are stationary. A more flexible approach is to use adaptive optics in combination with a wavefront sensor."
Ref: Encyclopedia of Laser Physics and Technology - beam quality, laser beam, M2 factor, ISO Standard 11146, divergence, nonlinear frequency conversion

- Ray
RayBurne is offline   Reply With Quote
Old 06-15-2011, 04:37 AM #9
qumefox's Avatar
Class 3B Laser
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
qumefox qumefox is offline
Class 3B Laser
qumefox's Avatar
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

Looks like a dirty or scratched lens to me personally. About the only way i've ever been able to get lenses clean is to remove them and completely submerge them in rubbing alcohol and swish them around. ***DON'T DO THIS WITH MULTI ELEMENT LENSES*** heh. It won't hurt them but they'll take forever to dry out unless you dismantle them.
__________________
Wavelengths in 'The Collection'
685nm, 655nm, 635nm, 589nm, 532nm, 473nm, 445nm, 405nm
qumefox is offline   Reply With Quote
Old 06-15-2011, 06:21 AM #10
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Re: Weird "Dust?" around the DOT

if i use strong polish the lense can get damaged?

Last edited by Fremo; 06-15-2011 at 12:48 PM.
Fremo is offline   Reply With Quote
Old 06-15-2011, 01:20 PM #11
RayBurne's Avatar
Member
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
RayBurne RayBurne is offline
Member
RayBurne's Avatar
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
Default Re: Weird "Dust?" around the DOT

Fremo: Do NOT polish the lens. Clean gently with non-lint Qtip or optical cloth using alcohol or a specialty fluid. Repeat at least twice. Personally, my 200mw O-like red laser has similar artifacts.

Lens in reasonable quality lasers are usually coated, any 'abrasive' will break down the coating since it is super-thin. Additionally, the lens may not be made of optical glass, but optical plastic (acrylic) which too is coated but is a softer material.

Wikipedia has a really nice writeup on 'Optical Coating' if you wish to read about it.

There probably should be a name for laser enthusiasts who seek artifacts in the beam... maybe 'laser anthropology'???

- Ray
RayBurne is offline   Reply With Quote
Old 06-15-2011, 01:32 PM #12
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Re: Weird "Dust?" around the DOT

could i clean it with turpetine?

never used it be4
Fremo is offline   Reply With Quote
Old 06-15-2011, 03:30 PM #13
qumefox's Avatar
Class 3B Laser
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
qumefox qumefox is offline
Class 3B Laser
qumefox's Avatar
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

Just use 90%+ rubbing alcohol..
__________________
Wavelengths in 'The Collection'
685nm, 655nm, 635nm, 589nm, 532nm, 473nm, 445nm, 405nm
qumefox is offline   Reply With Quote
Old 06-15-2011, 03:31 PM #14
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Fremo Fremo is offline
Member
 
Join Date: May 2011
Posts: 45
Rep Power: 0
Fremo is on a distinguished road
Default Re: Weird "Dust?" around the DOT

i dont think we got :P

doesnt it work with turpetine too? O.o
Fremo is offline   Reply With Quote
Old 06-15-2011, 03:39 PM #15
qumefox's Avatar
Class 3B Laser
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
qumefox qumefox is offline
Class 3B Laser
qumefox's Avatar
 
Join Date: Mar 2010
Location: Jackson, TN
Posts: 3,234
Rep Power: 4714
qumefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond reputequmefox has a reputation beyond repute
Default Re: Weird "Dust?" around the DOT

Um, you can get rubbing alcohol in pretty much any drugstore. turpentine is going to eat your coatings and/or lens if it's acrylic.. the AR coatings are delicate... so are the lenses. Never use paint thinner on anything you want to keep.
__________________
Wavelengths in 'The Collection'
685nm, 655nm, 635nm, 589nm, 532nm, 473nm, 445nm, 405nm
qumefox is offline   Reply With Quote
Old 06-15-2011, 09:43 PM #16
RayBurne's Avatar
Member
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
RayBurne RayBurne is offline
Member
RayBurne's Avatar
 
Join Date: Jun 2011
Location: Atlanta (Lawrenceville)
Posts: 46
Rep Power: 0
RayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant futureRayBurne has a brilliant future
Default Re: Weird "Dust?" around the DOT

Do not clean it with water,
Do not clean it with wine,
And certainly never clean a lens,
With spirits of turpentine.

-Ray
RayBurne is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 07:37 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC