Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Science & Lasers



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-12-2009, 09:31 PM #1
Kakcoo's Avatar
Class 1 Laser
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Kakcoo Kakcoo is offline
Class 1 Laser
Kakcoo's Avatar
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Default Dimming a laser

I've tried searching google and LPF, but I could not find any good information on this. I'm sorry if this has been answered before. Please provide some better search criterias if you know any.

Is it possible to controll the brightness of a module by using an external potentiometer between the driver and the power source? Would this damage the laser? Would it even work at all? If it workes, I guess that would be a fairly simple way of controlling the color of a multiple color enclosure.


Kakcoo is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-12-2009, 10:17 PM #2
Banned
 
Join Date: Mar 2008
Location: Austin TX
Posts: 1,341
Rep Power: 0
potatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond repute
potatorage potatorage is offline
Banned
 
Join Date: Mar 2008
Location: Austin TX
Posts: 1,341
Rep Power: 0
potatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond reputepotatorage has a reputation beyond repute
Default Re: Dimming a laser

You can turn down the pot on your driver, why would you need an external one?
potatorage is offline   Reply With Quote
Old 08-12-2009, 10:23 PM #3
Kakcoo's Avatar
Class 1 Laser
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Kakcoo Kakcoo is offline
Class 1 Laser
Kakcoo's Avatar
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Default Re: Dimming a laser

Because the trimpot is supposted to set the upper limit of what power the laser can operate at, and they are not meant for easy adjustment. I want to build a RGV labby enclosure with an easy adjustable color balance.
Kakcoo is offline   Reply With Quote
Old 08-12-2009, 10:45 PM #4
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Dimming a laser

You could use a second pot in series with the first..
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.
ElektroFreak is offline   Reply With Quote
Old 08-13-2009, 12:00 AM #5
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
hydrogenman15 hydrogenman15 is offline
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
Default Re: Dimming a laser

On my RGV labby i use lm317s with fixed resistors and an external pot. Just take the lm317's reference voltage (1.25) and divide it by the max current you want.

Example: You want 420mA's for an open can so 1.25/.420= just under 3 ohms. Its one of the main reasons I like DDL drivers so much.

--Hydro15
hydrogenman15 is offline   Reply With Quote
Old 08-13-2009, 01:47 AM #6
Cereal Eater
 
Join Date: Dec 2007
Location: Argentina
Posts: 6,333
Rep Power: 331
nikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond repute
Send a message via MSN to nikokapo
nikokapo nikokapo is offline
Cereal Eater
 
Join Date: Dec 2007
Location: Argentina
Posts: 6,333
Rep Power: 331
nikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond reputenikokapo has a reputation beyond repute
Send a message via MSN to nikokapo
Default Re: Dimming a laser

Quote:
Originally Posted by ElektroFreak View Post
You could use a second pot in series with the first..

This ^

If you use a pot in between the laser & battery you'll encounter major problems if you turn it down too much, the diode will not lase if it's below some given voltage.
nikokapo is offline   Reply With Quote
Old 08-13-2009, 02:09 AM #7
Kakcoo's Avatar
Class 1 Laser
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Kakcoo Kakcoo is offline
Class 1 Laser
Kakcoo's Avatar
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Default Re: Dimming a laser

Quote:
Originally Posted by nikokapo View Post
This ^

If you use a pot in between the laser & battery you'll encounter major problems if you turn it down too much, the diode will not lase if it's below some given voltage.
So pot between laser and battery = nono, but pot in series with pot = gogo?
Can i dim the laser smoothly until it blacks out, or will it stop lasing at some given threashold anyway?
Kakcoo is offline   Reply With Quote
Old 08-13-2009, 02:27 AM #8
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Dimming a laser

^Yes. Every laser has a threshold below which it will not lase.
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.
ElektroFreak is offline   Reply With Quote
Old 08-13-2009, 03:13 AM #9
Kakcoo's Avatar
Class 1 Laser
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Kakcoo Kakcoo is offline
Class 1 Laser
Kakcoo's Avatar
 
Join Date: Jul 2009
Posts: 76
Rep Power: 9
Kakcoo will become famous soon enough
Default Re: Dimming a laser

Aight. But lasing close to this threshold will not damage the diode? (I guess higher resistance will prolong the lifetime)

Edit: I've bought two mirrors for my future first white. I don't know how well these mirrors work for lasers, but they sure are cheap.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=310043868513
http://cgi.ebay.com/ws/eBayISAPI.dll...m=310054866112

Last edited by Kakcoo; 08-13-2009 at 03:15 AM.
Kakcoo is offline   Reply With Quote
Old 08-14-2009, 05:35 AM #10
millirad's Avatar
Class 3B Laser
 
Join Date: Apr 2009
Location: No. California
Posts: 2,576
Rep Power: 297
millirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond repute
millirad millirad is offline
Class 3B Laser
millirad's Avatar
 
Join Date: Apr 2009
Location: No. California
Posts: 2,576
Rep Power: 297
millirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond repute
Default Re: Dimming a laser

Yep, you want to run the diode at its mean(average) current range, not its peak if you expect it to live for very long. Especially if you want to do an RGV enclosure. Better to build it up once than replace diodes all the time. Let the fog machine do some work.
__________________
Greenie - 100mw in diy aluminum host
650nm - 260mw in MXDL host with brass heatsink
650nm - 325mw in stainless Raygun host. The dot is so bright it's
PINK/ORANGE!
Thanks Jay! Thanks Drew! Thanks Larry! Thanks Glenn! Thanks Dave!

Pink - 500mW (white w/red , ok not till later)
Please don't dazzle aircraft! You wouldn't hit someone in the face normally would you?
Home of the stainless RAYGUN !
millirad 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











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:49 PM.


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