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12X in a pen??? YES

yobresal

yobresal

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I decided to be a little crazy and make a pen build. I just haven't seen any pen build 8X, 10X or 12X lasers. Host is from a star tipped green laser pointer. It has a ruberized feel to it. It has a chrome button and tail cap and pen clip. The laser uses a Jayrob 405-G-1 lens. The diode is a BDR-205. The driver is the new groove 2. The output is >500mW. Duty cycles of 15 on/15 off are to be followed when using this one. It runs on 2 protected 10440 rechargeable cells. Current is 440mA. Here are some pics, video. Hopefully more to follow.
Imageshack - img0576.mp4 - Uploaded by Yobresal
img0568ic.jpg

img0567d.jpg

img0594x.jpg

img0593y.jpg

img0592n.jpg
 
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laserboystuart

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jesus christ yobresal, ive seen lots of your lasers but i think this is by far the most extreme!

stuart :)
 
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kevinmassey

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:lasergun::eek:
Just your average ~600mw presentation pointer...
Just how many 12x's do you have???
 
RA_pierce

RA_pierce

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It seems like you really like linear drivers.
Why not use a boost driver and a couple lithium primaries? 10440s are pretty useless under heavy load IMO... and this diode needs ~2.5W of electrical power.
 
Benm

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Somehow i think the driver or battery isnt the limiting factor here, but just the heat produced by the diode alone. I seriously doubt that even on a 15/15 duty cycle temperatures will remain acceptable in this host... though it is very cool to have a class IV this size!
 
yobresal

yobresal

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You're right I do use linear drivers very often. I used a boost in my chrome pocket mini and I used to use them in a lot of my earlier builds. Lately I have been using linear drivers. I like rechargeable lithiums. High capacity and good value. I suppose the best build I could think of would be an ehgemus host using a single protected 18650 a boost drive and a 12X pressed into the host.
This will be my 3rd personal 12x. I usually keep my collection to a maximum of 2 per wavelength so I am not sure why I built this. It was kind of an impulse build.
 
kevinmassey

kevinmassey

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I'm sure the heat producing properties of different diodes aren't the same, but I'd think they would be similar. high quality green pens over 100mw use 1W diodes, and run with longer duty cycles than that.
 
yobresal

yobresal

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Benm said:
Somehow i think the driver or battery isnt the limiting factor here, but just the heat produced by the diode alone. I seriously doubt that even on a 15/15 duty cycle temperatures will remain acceptable in this host... though it is very cool to have a class IV this size!
Click to expand...

I originally had this laser at 750mW but it was getting too hot by the end of a short duty cycle. I lowered it to this setting. It takes 30 seconds before I can feel any warmth.
 
RA_pierce

RA_pierce

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kevinmassey said:
I'm sure the heat producing properties of different diodes aren't the same, but I'd think they would be similar. high quality green pens over 100mw use 1W diodes, and run with longer duty cycles than that.
Click to expand...

I've dissected a few "high quality" green pens, and while I can't say what power the pump was designed for, I can say that they are never run at 1W.

In a 100mW CNI pen (averaging 120mW), the pump power to the crystal was ~0.43W. With the driver maxed out, I could easily get 700+mW out of the bare diode, but there is one thing to consider...

An 808nm pump requires ~2.2V and ~580mA for ~500mW output.
A "12X" diode requires ~5.8V and ~400mA for ~500mW output.

Comparing the total wattage as waste heat assuming 500mW output at the above values:
808nm: 1.276W in, 0.776W waste heat.
405nm: 2.32W in, 1.82W waste heat.

The 12X diode will dump out more than twice as much waste heat as a similar power 808nm diode.

Have built a few Class IV pens using 808nm pump diodes and could run them for 2.3 minutes at a time at 600mW before power dropped.
I don't think this is the case with 12X diodes in a pen host.
 
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brando132

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Chalkboard said:
I think the pen is not sufficiently heatsinked for a 12x at high powers.

duty cycles would be too low.

How long does it take to feel the heat?
Click to expand...

If you read the thread, you will find that all your question were already answered.
 
Pontiacg5

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Nice build, I was going to try that after I got some $$$.

I had an idea with the leadlight style case though, make a heatsink to fit over the pen housing with a large knob set screw. When you need more duty cycle, fit the heatsink over. When you want small and discreet take the heatsink off. You really couldn't do that with that rubber coating though.
 
Meatball

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Nice build there yobresal! :beer:

It's a unique one for sure, and even looks nice! I bet it's pretty neat having that much power sit in your shirt pocket.

Do you have a suspected battery life determined for this build? Those linear drivers are not the most efficient things...
 
Hemlock_Mike

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The current technology permits this pointer power. The new DrLava driver supports this. The "duty cycle" argument has always been a problem for some who are not builders.
WTH are you expecting from a pen or portable? This isn't a labbie.

HMike
 
kevinmassey

kevinmassey

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I've dissected a few "high quality" green pens, and while I can't say what power the pump was designed for, I can say that they are never run at 1W.

In a 100mW CNI pen (averaging 120mW), the pump power to the crystal was ~0.43W. With the driver maxed out, I could easily get 700+mW out of the bare diode, but there is one thing to consider...

An 808nm pump requires ~2.2V and ~580mA for ~500mW output.
A "12X" diode requires ~5.8V and ~400mA for ~500mW output.

Comparing the total wattage as waste heat assuming 500mW output at the above values:
808nm: 1.276W in, 0.776W waste heat.
405nm: 2.32W in, 1.82W waste heat.

The 12X diode will dump out more than twice as much waste heat as a similar power 808nm diode.

Have built a few Class IV pens using 808nm pump diodes and could run them for 2.3 minutes at a time at 600mW before power dropped.
I don't think this is the case with 12X diodes in a pen host.
Click to expand...

Thanks for explaining that to me RA!
 
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