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Old 12-17-2008, 12:28 AM #17
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Default Re:  Laser Radiation Bioeffects

Forgot to check the dates. Sorry!


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The best:
270 mw Milos custom built focusable with exceptionally low divergence and pinpoint spot
125 mw Dragon pen style "viper" putting out 150+
PGL-III-473-C 50 mw - peaking at 100mw
Daguin 445 custom built putting out 570mw
Daguin custom built Kryton 8x outputting 370mw - burns like fury - superb build and beam
Lots of other lasers too
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Old 12-17-2008, 12:35 AM #18
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Default Re:  Laser Radiation Bioeffects

Guys --

Listen to Senkat and Frothy ----

The sun is not a point source of coherent light. Apples and oranges here 8-) Protect at least one of your eyes.

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Old 12-21-2008, 12:04 PM #19
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Default Re:  Laser Radiation Bioeffects

Perhaps more to the point: sunlight is divergent.

Collimated light entering the pupil will be focused at the retina.
Divergent light entering the pupil will be focused behind the retina.
Convergent light entering the pupil will be focused in front of the retina.

A laser is usually close enough to a collimated beam that the difference is academic when it comes to eye injury. The variation in the eye itself is going to make a larger difference. But a flashlight, the sun, or just about any other spatially incoherent light source, will tend to be divergent, so the area it hits on the retina will be a lot larger than for a collimated beam. Similarly, a convergent beam is going to be at its tightest in the aquaeous humor, which is how they nuke floaters, a procedure that still carries a 4% risk of permanent loss of macular vision in that eye, due to the power level involved.

For those that read the quoted passage as 105x amplification, that is due to a copy-paste problem. The original text states 10[sup]5[/sup], but the superscript isn't pasted correctly. And 10[sup]5[/sup] is 100000x, so the figure is correct: a collimated beam of 1mW/cm will have a power level of 100W/cm at the retina. Accordingly, when a BR laser is putting out 100mW in a 5mm collimated beam (20mm), the density of optic power is 5mW/mm, which translates into 500W/mm at the retina.

Clearly, nobody in their right mind wants to risk 500W/mm of near-UVA to the retina.

OD3 brings that down to 0.5W/mm.
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