Old 02-24-2017, 12:10 AM #1
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Default Question about making a long duty cycle laser

Hey guys, I am trying to make a longer duty cycle out of a C6 host with copper tapered heat sink, and a NDG7475 1w diode. At 1amp it's putting out 650mw, while at 800ma it's putting out 500mw roughly. I am thinking though for this little host 1amp is going to definitely be too much over longer periods of time. So at 800ma in a little C6 host should I get near continuous duty cycles without worrying about excessive heat? I mean it's rated for three times that current.

Appreciate any input, I'm new here!


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Old 02-24-2017, 12:32 AM #2
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Default Making long duty cycle C6 Host - Have questions!

Hey guys, I am trying to make a longer duty cycle out of a C6 host with copper tapered heat sink, and a NDG7475 1w diode. At 1amp it's putting out 650mw, while at 800ma it's putting out 500mw roughly. I am thinking though for this little host 1amp is going to definitely be too much over longer periods of time. So at 800ma in a little C6 host should I get near continuous duty cycles without worrying about excessive heat? I mean it's rated for three times that current.

Appreciate any input, I'm new here!
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Old 02-24-2017, 12:45 AM #3
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Default Re: Question about making a long duty cycle laser

You already have another thread with exactly the same question.

Please do not double post threads.

Delete one of them and you may get so,e help.
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Old 02-24-2017, 12:47 AM #4
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Default Re: Question about making a long duty cycle laser

Looks like you started two threads on the exact same topic, please keep the discussion to one if possible and PM the mods to delete the other. That makes everything easier to find for everyone involved, rather than having two threads with diverging discussion.

Define near continuous? How long do you want to run it? How long do you want to let it cool?
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Old 02-24-2017, 12:56 AM #5
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Default Re: Question about making a long duty cycle laser

There are two things you need to be concerned with when trying to make a laser with a long duty cycle.
1-The diode produces heat which needs to be dispersed into the host effectively.
2-The driver has components which produce heat, and you also need to heatsink the drinker properly or it will be damaged.

If both of these are done properly and the laser is driven conservatively, the duty cycle should be unlimited.
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Old 02-24-2017, 12:57 AM #6
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Default Re: Question about making a long duty cycle laser

Sure I will delete one of them, if you tell me how!

I am wanting something to run for 30+ minutes without worrying about heating up the diode. Doesn't really matter how long for cool down times.
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Old 02-24-2017, 01:09 AM #7
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Default Re: Question about making a long duty cycle laser

I merged them for you folks!

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Old 02-24-2017, 01:20 AM #8
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Default Re: Question about making a long duty cycle laser

Hi,
30 + minutes in a C6 host no way maybe 1 minute to play it safe. That NDG puts out some heat . have a C6 host with a full copper sink and knob i made and with that diode 1 minute or a little more is the most. I make copper sinks and focus knobs for the C6

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Old 02-24-2017, 01:29 AM #9
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Default Re: Question about making a long duty cycle laser

Ok thanks for the info. So for a continuous run I'm probably better off going with the Osram PL520B with a <300ma driver?

Thanks for getting back to me so quickly!
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Old 02-24-2017, 01:30 AM #10
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Default Re: Question about making a long duty cycle laser

Quote:
Originally Posted by The Seeker of Life View Post
Ok thanks for the info. So for a continuous run I'm probably better off going with the Osram PL520B with a <300ma driver?

Thanks for getting back to me so quickly!
You're better going for something that isn't a pointer if you want long run times. You want a module with a beefy heatsink and mains power really.
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Old 02-24-2017, 10:59 AM #11
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Default Re: Question about making a long duty cycle laser

Yep, heat dissipation is crucial for long run times. The worst case scenario from having insufficient cooling for a diode is thermal runaway. Not a good way for your diode to die.
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Old 02-24-2017, 11:32 AM #12
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Default Re: Question about making a long duty cycle laser

Maybe something like this one?
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Old 02-24-2017, 12:38 PM #13
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Default Re: Question about making a long duty cycle laser

Big heat sink, lots of battery capacity and you have it. What you want to build isn't that heavy with heat compared to some of the new high power laser diodes, not difficult.

Don't worry about the red if you are a sincere member, if I see you stop posting the same question in other sections and start observing forum etiquette , I will pay back far more than I took in three days. Also, if someone disagrees with me you will get repped back into green today, I bet, netting more rep than you would have had otherwise.
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Old 02-24-2017, 12:45 PM #14
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Default Re: Question about making a long duty cycle laser

I think this guy is genuine Alaskan, he said he didn't know how to remove the other thread so Hap merged them. He didn't cause a fuss about it. So as long as you don't mind I will put him back in the green. He will soon get the hang of things round here.
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Old 02-24-2017, 12:56 PM #15
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Default Re: Question about making a long duty cycle laser

I expected someone to volunteer to do that, I'm reserving judgment but wanted to give a shot, as long as it doesn't stay.
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Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 02-24-2017, 01:01 PM #16
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Default Re: Question about making a long duty cycle laser

I had to balance him out again. I think your tactic is good for those who are clearly breaking the rules however.
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Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
Jetlasers PLE Pro's

If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
Which company should I buy from? By Sta






Useful Links:
Wavelength to RGB Converter
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