Blu ray and Arctic silver

tony70516 · Mar 31, 2009

i'm building my 2nd blu ray laser in a dorcy..
just a few noob questions.
1. Is arctic silver necessary? im using dark horse's v2 dorcy fullbody sink. its a snug fit though right?

2. Im using Dr. Lavas V4 driver. preset to 115 mA, thats basically thousands of hours of diode life correct?

thanks for the help

ndrew2505 · Mar 31, 2009

the thermal paste isnt necassary but any extra heatsinking measures will help extend the life of your diode..

tony70516 · Mar 31, 2009

but its an adhesive correct? so its basically permanent ill never be able to remove my housng from the heatsink once finished.

lasersbee · Mar 31, 2009

Arctic Silver makes a thermal Adhesive as well as thermal grease/paste...
it depends on which one your question is based on...

Jerry

GooeyGus · Mar 31, 2009

DONT epoxy the thing into the heatsink. Bad idea. Chances are you'll eventually be changing diodes and you dont want it to be a pain in the ass to get out. Just get the regular arctic silver 5 thermal compound if you really want to use it. I dont ever really use it as the metal to metal interface is already pretty decent and we're not talking about a ton of heat here. You need to dissipate less than a half-watt of heat... you'll be fine without it.

tony70516 · Mar 31, 2009

Ehh i think the diode will get tons of hours set to only 115 mA without the thermal compound. but the v4 driver is the same as the original only smaller right? just wanna make sure and i will post the pics when im finished

GooeyGus · Mar 31, 2009

Yeah in the grand scheme of things thermal compound vs no thermal compound is not really going to make a difference in this application.

pseudolobster · Mar 31, 2009

I didn't see you mention what type of diode this is... At 115mA a KES-400A or a DT-80111T diode would die pretty quickly, yet a PHR-803T would have a decent lifetime and a 4x or 6x diode would have spectacular lifetimes.

tony70516 · Mar 31, 2009

this is a phr 803t diode. the 6x diodes are too expensive right now. from my knowledge more than 40 bucks a piece. correct me if im wrong. but yes this is a 803t diode

rocketparrotlet · Mar 31, 2009

Your hours will be measured in hundreds, not thousands.

-Mark

tony70516 · Mar 31, 2009

wow you think? i figured it would be more

rancor · Mar 31, 2009

Arctic sliver 5 is capacitive (can carry electricity and tends to hold it I do not know how well though) I don't know if that would hurt the diode. There are a lot of other pastes like OCZ freeze or MX-2 that are just as good.

black_ice_pc · Mar 31, 2009

Arctic Silver 5 is NOT an adhesive, so if you're gonna use A.S., that's the one to get. Arctic Silver Ceramique(i think that's what it's called) is the epoxy version.

FrancoRob · Mar 31, 2009

black_ice_pc said:
Arctic Silver 5 is NOT an adhesive, so if you're gonna use A.S., that's the one to get. Arctic Silver Ceramique(i think that's what it's called) is the epoxy version.

You're right: arctic silver is a ~~simply thermal compound;~~ a factory that manufactures both thermal epoxy and thermal compound; the thermal compound is a soft paste (that remains soft) used to eliminate any air bubble between a heating surface and the relevant heatsink; it's main use is to allow the best heat transfer between the CPU of a computer and the relevant heatsink. Obviously it's NOT an adhesive, every computer user need to detach the heatsink to change it or to change the CPU while keeping the same heatsink. It's ~~the perfect~~ one of the best thermal compounds (silver has one of the highest thermal transmittance coefficient) everywhere one need to allow the best contact to dissipate heat.

For instructions see: www.arcticsilver.com

Sentences modified according to pseudolobster rebuke

pseudolobster · Mar 31, 2009

FrancoRob said:
You're right: arctic silver is a simply thermal compound; it's a soft paste (that remains soft) used to eliminate any air bubble between a heating surface and the relevant heatsink; it's main use is to allow the best heat transfer between the CPU of a computer and the relevant heatsink. Obviously it's NOT an adhesive, every computer user need to detach the heatsink to change it or to change the CPU while keeping the same heatsink. It's the perfect thermal compound (silver has the highest thermal transmittance coefficient) everywhere one need to allow the best contact to dissipate heat.

For instructions see: www.arcticsilver.com

Well, Arctic Silver is a company, not a thermal compound or adhesive. They make both thermal paste, as well as thermal epoxy.
http://www.arcticsilver.com/arctic_silver_thermal_adhesive.htm

Also, silver is far from being the best thermal conductor, diamond is. There are thermal pastes based on diamond, though I'm not really sure what difference it would make, the diode is already press fit into the module head with enough force that it should make flush contact. Thermal paste or epoxy would have little effect on heatsinking a laser.

Milos · Apr 1, 2009

I use both Arctic Silver 5 and Arctic Silver thermal adhesive for different purpose, so yes they both exist! .
However, violet diodes like to be warm, and at 115mA they will not be needing every every bit of heat dispersion help they can get. So, if you wanna save few bucks, for this particular use, i don't think you are going to prolong the life by using it. Its the electrons that shorten the life of the diode, not heat at this level.

If you build higher powered bluerays, or red lasers, then I'd say use everything you can to get rid of excess heat.

best regards

Blu ray and Arctic silver

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