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Old 06-30-2011, 12:59 AM #1
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Default How hot should a 445nm diode laser get? how to determine duty cycle

i have a coleman CR2 host and i want to figure out a good duty cycle so i dont kill the diode...how hot should the host get before i shut it off...it has a cute little heatsink lol...im driving it at 1.3A


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Old 06-30-2011, 04:05 AM #2
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Default Re: How hot should a 445nm diode laser get? how to determine duty cycle

I'm curious to see what answers you get from the more experienced folks here.

I will say this though, and understand that it shouldn't be taken as the final word by any stretch, just my opinion.

I typically don't like the concept of quoting duty cycles. It really comes down to how much of a risk you are willing to take. When the host (near the heat sink) starts getting warm, it's time to turn it off and let it cool awhile. The larger the mass of the heat sink / host the longer you can go before the host starts getting warm.
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Old 06-30-2011, 04:18 AM #3
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Default Re: How hot should a 445nm diode laser get? how to determine duty cycle

what i want to know is what defines "warm".

warm like 30C or warm like 60C....what is "warm"?

...a hot day in New England is much different than a hot day in Texas....my laser gets "warm" within 40 seconds. warm meaning ~35C in my case.
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Old 06-30-2011, 06:54 AM #4
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Default Re: How hot should a 445nm diode laser get? how to determine duty cycle

When it becomes warm you generally have 30 or so more seconds of the duty cycle left.
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Old 06-30-2011, 07:25 AM #5
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Default Re: How hot should a 445nm diode laser get? how to determine duty cycle

This might help... it will lead you through several other forum links, just be patient:
Exactly HOW is max duty cycle determined?

... I wouldn't REPLY in any of those links, because then you will be "reviving" old threads ("necroposting"); that seems to be frowned upon (it's annoying).

See THIS for some technical stuff:
http://www.merghart.com/p/30/heatsinking-a-laser-diode

Last edited by JBTexas; 06-30-2011 at 07:26 AM.
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