RE: [Utah-astronomy] Green laser backlash
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" <Aaron.Lambert@Williams.com> 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
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Kim The green laser that I have is a class IIIa lasers. Jim Kim Hyatt <khyatt@smithlayton.com> 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
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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 <khyatt@smithlayton.com> 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" <Aaron.Lambert@Williams.com> 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
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Brent The one I got from Howey Glattor is The 532nm green holographic collimator. Brent Watson <brentjwatson@yahoo.com> wrote: 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
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I should have said "a IIIa laser is a IIIa laser" Brent --- Jim Gibson <xajax99@yahoo.com> wrote:
Brent The one I got from Howey Glattor is The 532nm green holographic collimator.
Brent Watson <brentjwatson@yahoo.com> wrote: 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
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Does anyone know what the characteristics (specs) are for a pair of "Laser Resistant Glasses"? What makes them resistant to the laser effects. I know that I researched their prices some time ago and they were in the $300 to $400 dollar range. Maybe there is a better source for them now days. We could just don our "Collimation Glasses" and not worry about getting a direct retina hit... B) Tnx de n7zi Gary "Why buy something for ten bucks when you can make it for a hundred.", J.R.
Hi Gary: Laser safety-glasses are essentially colored filters, the color chosen so as to absorb the particular laser wavelength you are working with. The best ones, like sunglasses, have the filter material homogenously distributed in the plastic lens itself, so a scratch doesn't open a potentially dangerous "leak". You have to choose the safety glasses to match the laser you're using. Edmund used to sell several wavelengths, but I haven't checked in years. I just performed an experiment. Held a #58 green filter in front of my class IIIa laser level. The spot was attenuated severely, easily lost at least 80% of it's intensity. Laser light is still just light, and will respond to filtration the same as incoherent light. Chuck --- Gary Liptrot <n7zi@comcast.net> wrote:
Does anyone know what the characteristics (specs) are for a pair of "Laser Resistant Glasses"? What makes them resistant to the laser effects.
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Hey Chuck, So when you see me in my Oakley's (I'll have to borrow my son's) looking down the business end of my scope, I'm not just looking cool, I'm collimating... B) I bought one of the green lasers last month but haven't used it much yet. It's like all technology it has a light and a dark side to it. I love the fact that in a small group I can point out specific stars or constellations instead of the people squinting to see if they are looking at the right thing. I'm excited about them at a public event but I'm glad this thread came out about the possible misuse of the lasers. Something to think about. Thanks for the info C.H. Tnx de n7zi Gary "Why buy something for ten bucks when you can make it for a hundred.", J.R. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com]On Behalf Of Chuck Hards Sent: Monday, August 11, 2003 7:25 PM To: utah-astronomy@mailman.xmission.com Subject: RE: [Utah-astronomy] Green laser backlash Hi Gary: Laser safety-glasses are essentially colored filters, the color chosen so as to absorb the particular laser wavelength you are working with. The best ones, like sunglasses, have the filter material homogenously distributed in the plastic lens itself, so a scratch doesn't open a potentially dangerous "leak". You have to choose the safety glasses to match the laser you're using. Edmund used to sell several wavelengths, but I haven't checked in years. I just performed an experiment. Held a #58 green filter in front of my class IIIa laser level. The spot was attenuated severely, easily lost at least 80% of it's intensity. Laser light is still just light, and will respond to filtration the same as incoherent light. Chuck --- Gary Liptrot <n7zi@comcast.net> wrote:
Does anyone know what the characteristics (specs) are for a pair of "Laser Resistant Glasses"? What makes them resistant to the laser effects.
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Chuck here. It depends on output. My little red laser says right on the label "class IIIa". BUT-check out http://www.z-bolt.com They list a MODIFIED green laser pointer, with an output of from 7.5-50mw! 50mw would be very dangerous, this is output even beyond the average lab tube-type laser. C. --- Kim Hyatt <khyatt@smithlayton.com> wrote:
Brent, in what classes do both red and green lasers fall?
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The laser classifications list maximum output. I believe IIIa is 1/2 milliwatt, not 5 milliwatts. If they have been modified, they no longer fall within the same class. See this site for more info: http://www.lasersafety.net/CFR/class3.htm Brent --- Chuck Hards <chuckhards@yahoo.com> wrote:
Chuck here.
It depends on output. My little red laser says right on the label "class IIIa".
BUT-check out http://www.z-bolt.com
They list a MODIFIED green laser pointer, with an output of from 7.5-50mw! 50mw would be very dangerous, this is output even beyond the average lab tube-type laser.
C. --- Kim Hyatt <khyatt@smithlayton.com> wrote:
Brent, in what classes do both red and green lasers fall?
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participants (5)
-
Brent Watson -
Chuck Hards -
Gary Liptrot -
Jim Gibson -
Kim Hyatt