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 > Tutorials, Help & Repairs



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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-10-2009, 03:48 PM #1
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
cygnus cygnus is offline
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
Question Help. DX laser losing power after few secs.

Hi.
I'm new here and I've searched for the answer here and haven't found it..

I bought a "true" 100mw pen from DX (sku01372) and after few days I noticed the laser power weaken drasticaly after few seconds of continuous emission.

I've carefully disassembled the laser (following a video tutorial) looking for a toasted component or anything like that. But it seems (phisically) all right.

Wich component may cause this problem? Laser diode? Or may it be a stressed SMD on the circuit board?
I'm curious because if I find out that the problem is related to any of the components on the circuit board, I can easily replace it and the laser power will remain stable for more time.

Thank you guys, and sorry if this subject has already been discussed.


cygnus is offline   Reply With Quote







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







Old 11-10-2009, 04:02 PM #2
blue lasers's Avatar
Class 2M Laser
 
Join Date: Jul 2009
Location: cyprus,nicosia EUROPE
Posts: 590
Rep Power: 24
blue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud of
Send a message via MSN to blue lasers Send a message via Skype™ to blue lasers
blue lasers blue lasers is offline
Class 2M Laser
blue lasers's Avatar
 
Join Date: Jul 2009
Location: cyprus,nicosia EUROPE
Posts: 590
Rep Power: 24
blue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud ofblue lasers has much to be proud of
Send a message via MSN to blue lasers Send a message via Skype™ to blue lasers
Default Re: Help. DX laser losing power after few secs.

RMA it.
__________________
200mW Dilda USB powered<--VIDEO-TUTORIAL
DX 200mW green laser pen
Dorcy JR. Blu-Ray @ 120mA <--VIDEO
495mW 8x Blu-Ray <--VIDEO-REVIEW
DX 50mW focusable green<--REVIEW-VIDEO
blue lasers is offline   Reply With Quote
Old 11-10-2009, 04:19 PM #3
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
cygnus cygnus is offline
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
Default Re: Help. DX laser losing power after few secs.

I`ve done it. They sent 60% of my money back.
Now I have another lasers, but I want to fix that one.
cygnus is offline   Reply With Quote
Old 11-10-2009, 04:33 PM #4
wernertjuh's Avatar
Member
 
Join Date: Sep 2009
Posts: 39
Rep Power: 0
wernertjuh is on a distinguished road
wernertjuh wernertjuh is offline
Member
wernertjuh's Avatar
 
Join Date: Sep 2009
Posts: 39
Rep Power: 0
wernertjuh is on a distinguished road
Default Re: Help. DX laser losing power after few secs.

I have exactely the same problem with my 50mw.

The first days i got this laser it was working great. But now if i turn it on it light up good and after a few seconds it dim.

By 20celcius and higher it working good but by lower temperaturs it has that problem. If you turn the laser on for about 1 minute it is "warmt up" and it working good.
__________________
Verry bad English WARNING!

lasers:
(dx) Diode red 660nm 200mw
(dx) Diode red 650nm 100mw
(local hardware store) Diode red 650nm 5mw
(daguin) HeNe red 632.5nm 3mw
(dx) DPSS green 532nm 100mw
(dx) DPSS green 532nm 50mw
Coming soon a 473nm
(dx) DPSS blu-ray 405nm 100mw
wernertjuh is offline   Reply With Quote
Old 11-10-2009, 04:55 PM #5
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: Help. DX laser losing power after few secs.

ALL DPSS (green) lasers are very temperature sensitive. It's not defective, it's just a cheap DPSS.. Read here for more info..
__________________
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 11-14-2009, 12:04 PM #6
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
cygnus cygnus is offline
Junior Member
 
Join Date: Nov 2009
Posts: 11
Rep Power: 0
cygnus is on a distinguished road
Default Re: Help. DX laser losing power after few secs.

Well, ok. I understand thet the overheating is the reason, but which internal component is overheating? this is the question. I guess i could replace it using similar one with more heat tolerance.
By the way, I understand that cheap lasers gradually lose power while in operation, but mine changes the power instantly... it remains 100% for few seconds (about 15s) and then instantly goes down to 20%, and since a physical objects can't gain so much temperature in a fraction of second, I think this is most likely a IC or capacitor malfunction than a gradual diode overheating.
Any clue?


Last edited by cygnus; 11-14-2009 at 12:07 PM.
cygnus is offline   Reply With Quote
Old 11-14-2009, 03:05 PM #7
daguin's Avatar
Super Moderator
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
daguin daguin is offline
Super Moderator
daguin's Avatar
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
Default Re: Help. DX laser losing power after few secs.

As the diode heats the housing, it expands. As the housing expands the components move around. As they move around the alignment of the pump diode to the crystals changes. As the alignment of these components change the output is effected. If the alignment changes permanently, the output changes permanently. If the alignment returns when it cools, the output returns to its former strength.

The cheaper (and smaller) the components, the more vulnerable to changes in alignment they are.

Peace,
dave
__________________
How To Get Along In and Be Accepted in the Forum

If you got some value out of reading this forum, how about donating $2 to keep it going?
Click Here to donate

Love all, trust a few, do wrong to none.
-William Shakespeare
daguin 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 08:57 AM.


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