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Old 04-17-2011, 08:45 AM #1
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Default How with heatsink?

Hi I a making about a 1.5W laser, I just want to know what size heatsink I should have for a long duty cycle. I want it to be on at 3min at a time. I am currently using an aluminium heatsink which is 10cmx4cmx4xm. I think this is too small. What size do you think I should have???

Thanks a lot for all ur help


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Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Old 04-17-2011, 08:59 AM #2
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Default Re: How with heatsink?

Also depends on the host you´re using.

If you wanna get long duty cycles, you should consider a copper heatsink. Mohrenberg has them cheap right now.

There are also a few tricks to get longer duty cycles, search for "coin mod" for example.
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405nm >> Wickedlasers SONAR by lazeerer peak@968mW
445nm >> Kryton Smooth by lazeerer peak@2075mW
453nm >> Lipstick by rhd peak@158mW
473nm >> Optotronics RPL-B peak@112mW
515nm >> Skylasers HL peak@41mW
532nm >> Novalasers Alpha HP peak@284mW
589nm >> CNI PGL-III-A peak@89mW
594nm >> Laserglow Rigel peak@4mW
635nm >> MXDL by DTR peak@38mW
642nm >> Saillaser peak@23mW
660nm >> CR2 by lazeerer peak@524mW
685nm >> MXDL by lazereer peak@42mW

Above lasers measured with an Ophir nospin LPM


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Old 04-17-2011, 10:28 AM #3
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Default Re: How with heatsink?

Try this. If it is not enough you can sit it on a cpu heatsink or an alluminium/copper block.
The only problem with this is that it a labby heatsink. If you want a handheld try a guidesman. It can provide a 6 minute duty cycle.
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Old 04-17-2011, 11:02 AM #4
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Default Re: How with heatsink?

I am currently building a "lab Style" laser, so space is not a problem. I may actually have some copper lying around. What size do you recommend, i am using a LM317 driver so i will need to heatsink that too.

What size heatsink?

Thanks
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I am currently new to lasers, i have:

LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



Click me to Donate to me please Everything helps for me to save and review more lasers
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Old 04-17-2011, 03:48 PM #5
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Default Re: How with heatsink?

an old heatsink for a Computer power supply works great for me for my LM317 and I'm pushing about 1.2W so I'm sure it will handle 1.5W. It gets a little warm but works like a champ.
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Old 04-18-2011, 12:57 AM #6
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Default Re: How with heatsink?

Quote:
Originally Posted by itsmei View Post
I am currently building a "lab Style" laser, so space is not a problem. I may actually have some copper lying around. What size do you recommend, i am using a LM317 driver so i will need to heatsink that too.

What size heatsink?

Thanks
Well as far as size and labbys goes, the bigger the better .
I like to use a small to medium heatsink like the one I linked to and then sit copper or alluminium on and around it for extra heatsinking, and as was said earlier CPU heatsinks are great.
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Old 04-18-2011, 01:38 AM #7
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Default Re: How with heatsink?

One of the large round CPU heatsinks from around the pentium iii era will work. They can often be found at any place that accepts computers to recycle. I recently acquired 2 for 5 dollars at a surplus computer dealer near me. One is copper core with aluminum fins the other was all aluminum.
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405 still in sled
445 in aixiz module
473 lab style Received, v4 driver board with loose pot...got to get out the old soldering iron
2 ~5mw 532 dpss pointers
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632.8 HeNe <5mw
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1 DX ~200mw "Dilda-laser"

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Needed - Drivers for 12x and 445

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Old 04-18-2011, 11:33 AM #8
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Default Re: How with heatsink?

Ok thanks, I will see if I can get a nice finned heatsink off thesump or somewhere like that
__________________
I am currently new to lasers, i have:

LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



Click me to Donate to me please Everything helps for me to save and review more lasers

Last edited by itsmei; 04-19-2011 at 06:52 AM.
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