Both red and green lasers fall into the same
classifications. A IIa laser is a IIIa laser, as long
as it falls between 400 and 710 nanomemters. Red is
around 700 and green around 500.

Brent

--- Kim Hyatt wrote:
> Brent, in what classes do both red and green lasers
> fall?
>
> -----Original Message-----
> From: Brent Watson [mailto:brentjwatson@yahoo.com]
> Sent: Monday, August 11, 2003 3:36 PM
> To: Visit http://www.utahastronomy.com for the photo
> gallery.
> Subject: RE: [Utah-astronomy] Green laser backlash
>
>
> The following is from CFR 21 part 8 section 1040.10
> (b), where these things are codified and damage
> limits
> defined:
>
> (5) 1 Class I levels of laser radiation are not
> considered to be hazardous.
>
> (6) 2 Class IIa levels of laser radiation are not
> considered to be hazardous if viewed for any period
> of
> time less than or equal to 1 x 10\3\ seconds but
> are
> considered to be a chronic viewing hazard for any
> period of time greater than 1 x 10\3\ seconds.
>
> (7) 3 Class II levels of laser radiation are
> considered to be a chronic viewing hazard.
>
> (8) 4 Class IIIa levels of laser radiation are
> considered to be, depending upon the irradiance,
> either an acute intrabeam viewing hazard or chronic
> viewing hazard, and an acute viewing hazard if
> viewed
> directly with optical instruments.
>
>
> (9) 5 Class IIIb levels of laser radiation are
> considered to be an acute hazard to the skin and
> eyes
> from direct radiation.
>
> (10 6 Class IV levels of laser radiation are
> considered to be an acute hazard to the skin and
> eyes
> from direct and scattered radiation.
>
> For the complete text, got here:
>
http://www.lasersafety.net/CFR/cfr_title21_part1040_10.html
>
> Brent
>
>
>
> --- "Lambert, Aaron"
> wrote:
> > Hello all,
> > Just delurking here for a moment... For those
> of
> > you who
> > own green lasers already, where have found the
> best
> > place
> > to purchase them are? The best price I have seen
> is
> > EBay
> > for around $70. I always wonder about the quality,
> > etc of
> > EBay items that are mass-sold, though. I have
> > considered
> > buying one so it is easier to point out
> > constellations for
> > my kids (ages <= 6) and for youth groups (ages
> > between 12
> > and 18). Pointing with my finger works pretty well
> > for
> > showing one or two people, but I have tried that
> > while
> > camping with a group of 10+ and they cannot all
> > follow my
> > arm and finger very well.
> > Also, I understand that they are fairly
> dangerous
> > in
> > that they can cause severe eye damage if the beam
> > hits
> > someone in the eye. Is this true? Obviously I
> > wouldn't
> > intentionally let a kid (old or young) get a hold
> of
> > one,
> > but I remember being fairly curious and
> resourceful
> > as a
> > teenager... :) Anyway, I would appreciate any
> > comments or
> > insights from the group.
> >
> > Thanks,
> > Aaron Lambert
> >
> > _______________________________________________
> > Utah-Astronomy mailing list
> > Utah-Astronomy@mailman.xmission.com
> >
>
http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
>
>
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