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11-17-2014, 04:23 AM #17
 Class 3B Laser Join Date: Jan 2014 Location: Iraq Posts: 4,302 Rep Power: 2141
Class 3B Laser

Join Date: Jan 2014
Location: Iraq
Posts: 4,302
Rep Power: 2141
Re: Laser tragedies: Share your story

One of mine was failing to turn on the power supply before I connected the laser diode, zap.... the voltage and CC were set right from earlier that day, but a voltage spike killed my diode.

__________________

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

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11-17-2014, 04:37 AM #18
 Class 3B Laser Join Date: Aug 2013 Location: MI, US Posts: 2,653 Rep Power: 265
The Lightning Stalker
Class 3B Laser

Join Date: Aug 2013
Location: MI, US
Posts: 2,653
Rep Power: 265
Re: Laser tragedies: Share your story

Yeah, the power spikes. That reminds me of
another time with a 16X diode. The power
supply wires shorted out. When they
separated again, BAM! The spike went right
through the driver and killed the diode.

11-17-2014, 04:41 AM #19
 Class 3B Laser Join Date: Jan 2014 Location: Iraq Posts: 4,302 Rep Power: 2141
Class 3B Laser

Join Date: Jan 2014
Location: Iraq
Posts: 4,302
Rep Power: 2141
Re: Laser tragedies: Share your story

Dumb and dumber: I had my voltage pot and current adjustments turned to zero and turned on the power supply with a diode attached. Zap again, killed it. Learned it can voltage spike even when turned all the way down. Edit, this was with one of those cheap 3 amp LCD' China power supplies.
__________________

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

Last edited by Alaskan; 11-17-2014 at 04:43 AM.

12-21-2014, 07:25 PM #20
 Class 1 Laser Join Date: Dec 2014 Location: Kenai, AK Posts: 74 Rep Power: 11
Master Philip
Class 1 Laser

Join Date: Dec 2014
Location: Kenai, AK
Posts: 74
Rep Power: 11
Re: Laser tragedies: Share your story

I haven't built my own laser yet. (I'm pretty new here.) However, remember when there were only little red laser pointers at the store and they were something like \$10? Then, suddenly, there was talk about there being green lasers? (I'm refering to my own experience as this was all way before I knew anything at all about lasers and still don't know much...) I was like, oh my freaking god, I have to check this out. So, I bought a <5mw 2AAA greenie from Radio Shack (I forget the nm.) for about \$50.
I bought it thinking (with my ignorance) that it was the holy grail of hand held lasers (because I never really looked around anywhere except the local electronics stores of which none had any powerful lasers.)

So, I buy this thing and play with it for a few days. Then, I come across this youtube video where this kid shows you how to drill a hole in the back side of it and turn this knob/screw head thing inside to make it burn stuff. I remember thinking: "Where's my drill!" Next thing I knew, I turned the knob and poof! No more green laser beam.
If only I knew about LPF back then: Pot modding FAQ's

But, if it wasn't for that rediculous thing I did to that horribly overpriced pointer, I never would have gotten back online and researched what I did wrong. Those searches are what eventually led me to discover that there are way more powerful (and more colorful) lasers out there. Not only that, but now I've joined this online community of people who actually like lasers even more than I do. (I never would've guessed that a site like this existed.) Now, the more threads I read, the more my interest grows and I'm sure, one day soon, I'll end up converting one of my spare rooms into a laser friendly work zone.

Stay tuned! More tragedies to come!
__________________
You're only as good as you think you are until someone comes along and proves you wrong. Question is: Do you take it with grace or salt?

Last edited by Master Philip; 12-22-2014 at 03:27 AM. Reason: Adding additional information.

07-14-2015, 12:17 PM #21
 Class 3B Laser Join Date: Nov 2008 Location: Germany Posts: 4,239 Rep Power: 292
Elektrotechniker
Class 3B Laser

Join Date: Nov 2008
Location: Germany
Posts: 4,239
Rep Power: 292
Re: Laser tragedies: Share your story

Another busted gas lasers
Rip

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