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Old 12-05-2012, 11:25 PM #1
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Default Laser safety glasses needed for unfocused beam?

I have a noob question that I'm hoping someone can answer.
I want to start out by saying that I understand safety glasses should be worn, I even have a few pair.

My question: is the danger the same with an unfocused beam? Or less dangerous ? More dangerous?

I ask because I am using a 20mW Sony 405 diode in a semi focused fashion. Using it as a csi style black light flashlight.

Next question: in laymans terms with no scientific calculations, can someone please explain the rating on the glasses, and what the minimum rating I would need at this power level. My pair are 5 OD. But they were $80. Other pairs are rated at 2 OD that cost $20, I saw a pair of 7 OD for $160.


Can anyone shed light on the price difference / value ?


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Old 12-05-2012, 11:28 PM #2
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Default Re: Laser safety glasses needed for unfocused beam?

Less dangerous with an unfocused beam. The danger is based on power density (W/cm^2) not power alone.
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Old 12-08-2012, 03:42 PM #3
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Default Re: Laser safety glasses needed for unfocused beam?

Quote:
Originally Posted by ARGLaser View Post
Less dangerous with an unfocused beam. The danger is based on power density (W/cm^2) not power alone.
Do you know, approximately, the threshold between safe and unsafe value?
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Old 12-09-2012, 05:20 PM #4
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Default Re: Laser safety glasses needed for unfocused beam?

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Originally Posted by Arayan View Post
Do you know, approximately, the threshold between safe and unsafe value?
Around 1mW/cm^2


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Old 12-09-2012, 06:04 PM #5
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Default Re: Laser safety glasses needed for unfocused beam?

Thanks, this is useful to know
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My Lasers
80 mW, 405 nm Elitelasers
5 mW, 405 nm Elitelasers
2.5W, 445 nm by Yobresal
Worlds most powerful handheld 4.9W 445nm by ARGLaser Link
>80 mW, 473 nm CNI-style handheld laser SOLD
160 mW, 532 nm, Optotronics pen SOLD
Focusable 150 mW, 532 nm
5 mW, 532 nm, Laserglow Anser
2 mW, 594 nm, Laserglow Rigel-2 SOLD
380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
<400 mW (220 mW) 808 nm Armlaser
KW-range 1064 nm pulsed YAG laser "gun" from AnselmoFanZero Link
40W, 10600 nm DIY CO2 laser Link
Safety glasses for each wavelength described above



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