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 > Drivers, Test-load, Power Supply, & Batteries



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



Reply
 
LinkBack Thread Tools Display Modes
Old 06-13-2014, 04:54 AM #33
The Lightning Stalker's Avatar
Class 3B Laser
 
Join Date: Aug 2013
Location: MI, US
Posts: 2,654
Rep Power: 716
The Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond repute
The Lightning Stalker The Lightning Stalker is offline
Class 3B Laser
The Lightning Stalker's Avatar
 
Join Date: Aug 2013
Location: MI, US
Posts: 2,654
Rep Power: 716
The Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond repute
Default Re: 100w CW handheld laser?

I would plan on a 50A margin. The output ratio on those diodes is slightly under 1W/A, and it could take
up to 46A to get the full rated output. You will need a BIG heatsink to get a decent runtime.

On the battery end, there is no such thing as a 5V battery. You will need either a 6V lead acid or a couple
modified drill packs with some arrangement of series/parallel cells. I would lean towards NiCd, as they are
safer than lithium. A typical NiCd cell can source 2A, so you will have to parallel 25 cells and have 4-5
parallel banks in series to get 4.8-6V.

Lead acid would be the easiest way to go, really. They are readily available and you could get away with
using only one. You could go with SLA to get operation in any position, but they are real pants both in
terms of current capabilities and service life. If this were my baby I would go with a small golf cart battery.
You would have to keep it upright, but it would last for years as long as it is properly taken care of.


__________________
ALL NEW MEMBERS MUST READ THIS!!! --> http://www.laserpointersafety.com

"Where, now, is the way by which the light distributes itself" - Job 38:24

YouTube Channel
The Lightning Stalker is offline   Reply With Quote







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







Old 06-13-2014, 07:24 AM #34
WizardG's Avatar
Class 2 Laser
 
Join Date: May 2011
Location: Oregon
Posts: 398
Rep Power: 2630
WizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond repute
WizardG WizardG is offline
Class 2 Laser
WizardG's Avatar
 
Join Date: May 2011
Location: Oregon
Posts: 398
Rep Power: 2630
WizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond reputeWizardG has a reputation beyond repute
Default Re: 100w CW handheld laser?

According to the datasheet for the IRFP064N, the regulator circuit shown will require a minimum of 5.25 volts input to ensure the MOSFET will pass 50 amps. If you're really gonna try this I'd modify the regulator to use a separate battery as a gate bias supply. That way you could have a small 9V battery to supply the gate drive voltage and use a LiPO cell (preferably a couple in parallel!) to supply the heavy current for the laser diode. With a 3.7 volt LiPO battery you'd be dropping only slightly above 1 volt across the MOSFET greatly reducing heating.

__________________
125mW 405
1.157 watt 447
2 meter long hene @ 57mW
Assorted greenies, best @ 244mW of 520
WizardG is offline   Reply With Quote
Old 06-13-2014, 07:38 AM #35
DashApple's Avatar
Class 3R Laser
 
Join Date: Jan 2009
Posts: 1,354
Rep Power: 6853
DashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond repute
DashApple DashApple is online now
Class 3R Laser
DashApple's Avatar
 
Join Date: Jan 2009
Posts: 1,354
Rep Power: 6853
DashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond repute
Default Re: 100w CW handheld laser?

Quote:
Originally Posted by The Lightning Stalker View Post
I would plan on a 50A margin. The output ratio on those diodes is slightly under 1W/A, and it could take
up to 46A to get the full rated output. You will need a BIG heatsink to get a decent runtime.

On the battery end, there is no such thing as a 5V battery.
The coherent 40W CCP diodes need around 42A - 43A to produce the 40W output , if it needs 46A then it's near the end of its life .

I just used 5 volt source as an example .

But as above this post a separate gate bias supply and 3.7V lipo would work ,

Quote:
Originally Posted by Sigurthr View Post
Excellent work here, Twirly (ionlaser555)!

If he has already grabbed that 10mOhm resistor I recommend running a second one in series for 0.02 Ohms (~35A). Better to be a bit conservative anyway.

Oh, and 92W into a mosfet is nothing to scoff at, plan your thermal management!
Thanks : D , Yeah , even for testing that would be best .
__________________
Stuck In The places I Hated The Most , Reboot My Memory , Restart My heart , Seal Up All Of My Wounds Take Me Back To The Start !
Rip Me To Peices , Replace What You Can , Bury The Rest And Build A New Me To Plan !

Last edited by DashApple; 06-13-2014 at 04:48 PM.
DashApple is online now   Reply With Quote
Old 06-19-2014, 08:07 AM #36
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Currently in Iraq.
Posts: 7,085
Rep Power: 48485
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Alaskan Alaskan is offline
Class 4 Laser
Alaskan's Avatar
 
Join Date: Jan 2014
Location: Currently in Iraq.
Posts: 7,085
Rep Power: 48485
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Default Re: 100w CW handheld laser?

I've been thinking of a different kind of cooler for high powered lasers, using a CO2 cartridge, get a valve of some kind to allow the gas to slowly release through a heat sink attached to your diode and you will have more cooling than a huge chiller without wires or tubes attached to it. You can buy them from small to large, I'm certain this will work fine, just that you will need to replace them, of course. I'm thinking this would make any laser uber cool in more ways than temperature alone. Releasing the gas can cause a heatsink it flows through to get extremely cold, even ice up if you release enough gas fast enough. I am sure there is a speed of release that will produce the right cooling without using them up too fast, even for 100 watts of dissipation, especially since your battery won't last long anyway.

Example: http://www.ebay.com/itm/Genuine-Inno...49e2b9&vxp=mtr

Oh, by the way, I've been gathering parts and the needed test gear for the same kind project now for two years. 808nm with a bar laser diode isn't going to be a very tight beam, but that isn't what I want anyway, I am going to use a 40+ X large beam expander for mine to reduce divergence (series of expanders with a lot of loss, unfortunately, thus why I am starting out with so much power from the laser source). I don't want to use this for anything other than a long range beacon which won't have a concentrated enough beam to harm anyone, less you point it at someone too close. I have a lot more ideas for it than I am posting about, but I am facing the same issues you are. As far as current limiting goes, for something like this, it might be easier to just keep the thing so damn cold it can't run into destructive over current thermal runaway than try to use a solid state current regulator but I'm also working on that too. One way of handling it might be to use both a thermal and current fuse or switch which will turn off the power, just in case the thing runs away and starts pulling too much current or gets too hot but they need to be fast acting. That said, from what I've come to find, if the diode is kept cold enough that won't happen very easily, some say it can't happen.

I believe I've solved the power source problem for a portable high power laser like this and that is to use a single (or paralleled) 2 volt lead acid battery. From what I've found, the 2 volt cyclon battery is the best thing to use. You can buy single cell 2 volt 25 ampere hour ones fairly cheap on ebay.

Example: http://www.ebay.com/itm/BATTERY-ENER...item27e3ef84ef

Here's a discharge graph for these types of batteries: http://www.atbatt.com/media/sku_pdf/...tion_Guide.pdf - Look for the "state of charge..." graph. This graph shows that the battery voltage dips less than a couple of tenths of a volt from a fully charged state before being completely discharged (high of 2.14 volts to a low of 1.96 volts), close to ideal, I think, as it allows your laser device to keep on lasing at closer to full power until the battery is completely drained.

For my own unit, I think I will use three or more 8 ampere hour ones, they are fairly slim and I can wire three in parallel in a long tube. Of course, you won't be using a current regulator with a 2 volt battery for a 2 volt diode, the losses (even if it could be engineered) would be too high to reach the voltage you need to fire off the diode. For this battery use thermal and current cut-offs/fuses and cool the hell out of the laser diode with CO2 and I think it will work fine without problems, as long as it doesn't get so cold you cause other problems with thermal shock to the laser diode or the lens having condensation on it. One of the things I am thinking of doing is to build in a wire wound rheostat or variable high current wire wound resistor (if it doesn't cause damaging voltage spikes due to inductance or switching, still working on this idea) in series with the battery to slowly turn up the voltage to the diode to just below the amount needed to lase to allow it to warm up first, this will keep you from thermally shocking it with full current when fully energized, especially important if you chill it with gas. Alternatively, you might just use a non-inductive high current voltage dropping resistor in series with the battery to bring the diode up to operating temperature first without actually lasing enough to produce much if any IR output and then just bridge across it with a shorting switch to take it out of the circuit allowing full lasing voltage. In this setup you would have two on buttons or switches, one to warm it up and another to "fire" the laser. This might be a simpler way of preventing thermal shock and would be much physically smaller to deal with than a high current wire wound variable resistor with the problems it might possibly induce. Still, unless you can find some way of "soft starting" the voltage to the diode (a mechanical switch is a hard start and if you have wires to your battery, you will have some amount of inductive spiking), I'd have a fast acting spike suppressor across the diodes terminals, it is a good practice to have one anyway. You can probably find one which is designed for these diode bars for just ten bucks but I cannot seem to find where right now, I bought mine a year ago, forgot who makes them.

Edit: Found it, they are called Lasorb ESD absorbers and here's a link to one on ebay: http://www.ebay.com/itm/LASORB-ESD-a...item58b16de256

Remarking on a members post earlier in the thread; sure, it's a steep learning curve if you don't have background in lasers, and as he recommended do some projects with small ones first and in time it won't be so daunting. One thing I've found is some folk can get quite angry with a newbie undertaking something this challenging at that kind of power in IR due to the fear you will harm someone, if not yourself, with your toy. I completely understand that concern as it would reflect poorly on all laser hobbyist, but don't let them get you down, keep pressing but be safe.

Disclaimer: I am not a laser expert, not even close... but I do know a few things about electronics in general. Because of this, confirm and do your own research from other sources before using my suggestions.

See my big laser and RGB light beacon: http://imageevent.com/qdf_files/tech...ndlaserproject

Last edited by Alaskan; 06-22-2014 at 05:36 AM.
Alaskan 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


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f67/100w-cw-handheld-laser-89683.html
Posted By For Type Date
Ghostbusters Proton Pack Gun images This thread Refback 04-28-2017 05:14 PM
Lipolbattery.com Traffic, Demographics and Competitors - Alexa This thread Refback 10-26-2016 07:36 AM










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 09:06 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