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.


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


2.5 Watt Blue Thor M 2 Laser Pointer











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

List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 05-22-2014, 07:09 PM #1
KrowBar's Avatar
Class 1M Laser
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 41
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
KrowBar KrowBar is offline
Class 1M Laser
KrowBar's Avatar
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 41
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
Default Warm to the touch

I am fairly new here and certainly haven't read every post on the forum (so might have missed some discussion of this), but I have seen several threads, particularly reviews, that seem like they might be missing a basic concept. I have seen many people gushing about "really great thermal capabilities" of a particular heat sink, host, or the combination thereof using statements like "It barely get's warm to the touch after being on almost a full minute" I just wanted to point out that if the host doesn't get warm to the touch it could be due to very poor thermal behavior. If you had a 100 deg.C diode surrounded by wood/plastic/fiberglass, you might easily say that it doesn't get warm to the touch. It seems that the best performance would come from a build that does get warm, as this means it is effectively absorbing heat from the diode, and will also be able to give that heat up to the air/your hand so it can be turned on again without too much wait. Admittedly, if it's a very large heatsink with the purpose of allowing a long transient "on" time before it must first be turned off, then it would also be cool to the touch for some time after a "cold start".

Does anyone have a sink/host they would describe as a great thermal performer, that they would also describe as getting warm quickly?


KrowBar is offline   Reply With Quote










Old 05-22-2014, 07:44 PM #2
Wolfman29's Avatar
Class 3B Laser
 
Join Date: Jan 2011
Location: Davis, CA
Posts: 3,828
Rep Power: 227
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: 227
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: Warm to the touch

You are entirely right. I have a solid silver host, known to have great thermal capabilities, and it clearly gets "warm to the touch" after a short 20 seconds or so.

However, sometimes, if the heatsink is properly designed and made out of a clearly effective thermal conductor (like copper or aluminum), the heatsink will have a large enough surface area to radiate the heat it takes on quickly. This means that the equilibrium temperature is significantly lower than that of a cylindrical heatsink, and therefore it takes a longer time to reach the same temperature as a cylindrical heatsink would. Sometimes, this is what some people refer to. Other times, however, people just don't realize that diodes don't actually put out a lot of energy, so they think their heatsink is performing well when actually the diode just isn't outputting a lot of heat in the first place.

Last edited by Wolfman29; 05-22-2014 at 07:44 PM.
Wolfman29 is offline   Reply With Quote
Old 05-22-2014, 08:27 PM #3
chipdouglas's Avatar
Class 3B Laser
 
Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 266
chipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond repute
Send a message via Yahoo to chipdouglas
chipdouglas chipdouglas is offline
Class 3B Laser
chipdouglas's Avatar
 
Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 266
chipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond repute
Send a message via Yahoo to chipdouglas
Default Re: Warm to the touch

you are correct. I have a solid sterling silver hose that houses an aixiz module, and I use silver foil to make a tight fit. it gets pretty warm in about 30 seconds.

btw, where did you get that 100 degree C from. that is actually the optimal temp for the Oclaro 445s. =)
__________________
IN A CONSTANT STATE OF PICNIC

I AM THE STATUS QUO

ARE YOU A NEW MEMBER, OR EVEN MORE, ARE YOU NEW TO ONLINE FORUMS... READ THIS
LASER POINTER FORUM ETIQUETTE


for pot modding facts click below

http://laserpointerforums.com/f51/pot-modding-faqs-40510.html
chipdouglas is offline   Reply With Quote
Old 05-24-2014, 03:00 AM #4
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,475
Rep Power: 1247
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,475
Rep Power: 1247
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Warm to the touch

Still, some of the heat sinks people use are made of copper, which has a pretty high thermal mass despite its great conduction. Those heatsinks really aren't meant to be used to quickly move heat to the air, but rather just sink the heat directly, which is probably fine given peoples' usage patterns. Ideally, for infinite duty cycles, the host/module would have enough surface area to dissipate the heat into the air, for no net gain in temperature after a while.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is online now   Reply With Quote
Old 05-26-2014, 12:56 AM #5
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,096
Rep Power: 4165
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is offline
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,096
Rep Power: 4165
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Warm to the touch

You are correct. I've attempted to do a bit of a writeup on the subject in the past: Merghart.com - Heatsinking laser reference

And yes, a powerful laser (something like 1 watt) should probably get warm to the touch unless it is fitted in an enormous heatsink/host.
Benm is offline   Reply With Quote
Old 06-01-2014, 01:21 PM #6
Junior Member
 
Join Date: Feb 2014
Posts: 20
Rep Power: 0
Neel is on a distinguished road
Neel Neel is offline
Junior Member
 
Join Date: Feb 2014
Posts: 20
Rep Power: 0
Neel is on a distinguished road
Default Re: Warm to the touch

Quote:
Originally Posted by Benm View Post
You are correct. I've attempted to do a bit of a writeup on the subject in the past: Merghart.com - Heatsinking laser reference

And yes, a powerful laser (something like 1 watt) should probably get warm to the touch unless it is fitted in an enormous heatsink/host.
Found this very useful. Thanks for the share.
Neel is offline   Reply With Quote
Old 06-01-2014, 10:55 PM #7
upaa27's Avatar
Class 2M Laser
 
Join Date: Jul 2013
Location: San Francisco
Posts: 626
Rep Power: 90
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
upaa27 upaa27 is offline
Class 2M Laser
upaa27's Avatar
 
Join Date: Jul 2013
Location: San Francisco
Posts: 626
Rep Power: 90
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
Default Re: Warm to the touch

You are so right. I know this wasn't ment to be funny but couldn't help but chuckling(memories).

Have a good one XD
upaa27 is offline   Reply With Quote
Old 06-02-2014, 06:13 AM #8
638nmScare's Avatar
Junior Member
 
Join Date: Jun 2014
Location: RED, white, and blue
Posts: 23
Rep Power: 0
638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light
638nmScare 638nmScare is offline
Junior Member
638nmScare's Avatar
 
Join Date: Jun 2014
Location: RED, white, and blue
Posts: 23
Rep Power: 0
638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light638nmScare is a glorious beacon of light
Default Re: Warm to the touch

By "thermal capabilities" do you mean thermal conductivity or specific heat capacity? or both?
__________________
RED Red Rep is Welcome
638nmScare is offline   Reply With Quote
Old 06-02-2014, 03:27 PM #9
KrowBar's Avatar
Class 1M Laser
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 41
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
KrowBar KrowBar is offline
Class 1M Laser
KrowBar's Avatar
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 41
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
Default Re: Warm to the touch

I suppose the thermal capabilities of some module/HS/host combination would be best quantified by the ability to keep the diode below some target limiting temperature for a specified time given some ambient condition. This effect is a function of the conductivity,heat capacity, emissivity, and geometry. I seem to remember a thread devoted to touting/arguing the benefits of heat capacity over conductivity, which included some discussion of "aluminum dissipates better even though copper conducts better" nonsense, but I don't think the thread ever came to a productive/practical conclusion. All of the thermal material properties of a heatsink, combined with the size and geometry affect the performance, and one particular attribute cannot necessarily be prioritized above the others. A decent thermal model (even a simple 1-D model) could go pretty far in allowing fast comparisons of two materials for a given geometry (I found it somewhat amusing in reading the above mentioned thread that nobody actually used a mathematical thermal model and plugged in some numbers to "back up" their position on the subject). In this thread I simply wanted to point out my observation that some people may be drawing the opposite conclusion about the thermal performance of a build when using the "to the touch" measuring technique. I think the measurement itself, while not objective and repeatable, may still be valid to some extent. The interpretation of the results is, however, often flawed in my opinion. If "thermal performance" is not in fact related to keeping the diode cool, but keeping the hand of the laser wielder cool, then my opinion would change.
KrowBar is offline   Reply With Quote
Old 06-02-2014, 04:02 PM #10
Shakenawake's Avatar
Class 3R Laser
 
Join Date: Mar 2013
Location: Colorado
Posts: 1,705
Rep Power: 1392
Shakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond repute
Shakenawake Shakenawake is online now
Class 3R Laser
Shakenawake's Avatar
 
Join Date: Mar 2013
Location: Colorado
Posts: 1,705
Rep Power: 1392
Shakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond repute
Default Re: Warm to the touch

good observation, I had thought the same thing but never voiced it. it's aways good to not assume things, or make baseless claims.

yes the point is to draw the heat away quickly, so you could argue the faster the host feels warm, the better the heat sinking is working. (or smaller your heatsink is)

I want a silver host, lately it's dropped below $18.75 per oz, so maybe I will.
__________________
501B BDR-209 16X 405nm 630mW @.52Ag lens
Host by Ehgemus NUBM44 450nm 6.8W @4.5A g lens
Host by Ehgemus M462 462nm 1.5W @1.2A g lens
Dominator NUBM07E 465nm 4.3W @3.5A g lens
L2P Nichi@ NDG4216 515nm 110mW @ .35A
501B by Blord osr@m PL520 520nm 95mW @.3A g lens
PL-E pro from Jetlasers nichi@ NDG7475 520nm 980mW, 730mW w/ 10X BE

Lasermax Genesis sight 532nm 5mW
RPL from Optotronics 532nm 450mW

Spartan from Dragonlasers 589nm 50mW
501B HL63133DG 638nm 210mW @.3A g lens
501B Ocl@ro HL63193MG 638nm 960mW @1.3A g lens

501B by Blord LPC 826 660nm 325mW @?A g lens
PL660 from Laserbtb 660nm 1020mW

LPM
DL matrix and fan transmission gratings

laser powers in sig are about 20 seconds into duty cycle, not peak powers

http://laserpointerforums.com/f39/co...her-94720.html

(I guess I am a vet now)

Last edited by Shakenawake; 06-02-2014 at 04:02 PM.
Shakenawake is online now   Reply With Quote
Old 06-19-2014, 07:12 PM #11
Zar Zar is offline
Banned
 
Join Date: Jun 2014
Location: Eastcoast
Posts: 39
Rep Power: 0
Zar is infamous around these partsZar is infamous around these partsZar is infamous around these partsZar is infamous around these parts
Zar Zar is offline
Banned
 
Join Date: Jun 2014
Location: Eastcoast
Posts: 39
Rep Power: 0
Zar is infamous around these partsZar is infamous around these partsZar is infamous around these partsZar is infamous around these parts
Default Re: Warm to the touch

this is very true OP, which is why I love iPhone design, it gets hot when I do intense internet activity over LTE, but then cools down within a minute once I stop, and my old Galaxy S3 would take long time to heat up but then stay hot for very long time
Zar 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












Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 01:27 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