Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Safety & Legal Issues



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 03-31-2010, 06:32 AM #1
Junior Member
 
Join Date: Mar 2010
Posts: 6
Rep Power: 0
tefeari is just really nicetefeari is just really nicetefeari is just really nicetefeari is just really nicetefeari is just really nice
tefeari tefeari is offline
Junior Member
 
Join Date: Mar 2010
Posts: 6
Rep Power: 0
tefeari is just really nicetefeari is just really nicetefeari is just really nicetefeari is just really nicetefeari is just really nice
Default Line Laser Safety

How safe/dangerous are line lasers?

Let's take 100mw to be the example output power. Let's also suppose the laser is spread out using a lens (or some other standard optical piece that is used for non-scanning line lasers).

If a 5mw dot laser is the safety threshold with a spot size of 1cm, then wouldn't a 100mw line laser spread out over than more than 20cm be be safe in theory?

I imagine that in reality the line won't have a perfectly uniform power density, so it seems like it would be best to be a bit further than 20cm away. It seems reasonable to believe the distribution must be roughly even though (please correct me if I'm wrong here). So could we stand at the distance where the beam is spread out over 1 meter and call it a sure bet?


tefeari is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 03-31-2010, 08:07 AM #2
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Wink Re: Line Laser Safety

Hmmmmm, yes, a line can be less dangerous that a spot, for the eyes, but personally, i suggest you to always considerate lasers as not toys ..... managing and using them with safety in mind, is always the better thing to do, cause, after all, are still lasers, and are still "potentially dangerous".

I know, maybe i look a bit over-cautious, but remember always that you only have 2 eyes, and there's no spare parts for them ..... after all, always better safe than sorry, right ? .....
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 03-31-2010, 10:48 AM #3
davidgdg's Avatar
Class 2 Laser
 
Join Date: Dec 2008
Location: London
Posts: 271
Rep Power: 16
davidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to behold
davidgdg davidgdg is offline
Class 2 Laser
davidgdg's Avatar
 
Join Date: Dec 2008
Location: London
Posts: 271
Rep Power: 16
davidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to behold
Default Re: Line Laser Safety

Quote:
Originally Posted by tefeari View Post
How safe/dangerous are line lasers?
...

If a 5mw dot laser is the safety threshold with a spot size of 1cm,
...
The U.S. regulations are by reference to the radiant power detectable via a 7mm circular aperture (this figure is obviously by reference to the diameter of a fully expanded pupil). The Class 3A limit (indoor lecture theatre limit) is 5mw.

It is then easy to calculate equlvalence figures as long as you know the initial beam diameter, power and the divergence. If you assume divergence of 1mrad and an initial beam diameter of 1mm (fairly typical figures for high quality units), then rougly speaking:

A 25mw laser will be equivalent to a Class 3A at a distance of >14.5 meters (~50 feet)

A 50mw laser will be equivalent to a Class 3A at a distance of >21 meters (~70 feet)

A 125mw laser will be equivalent to a Class 3A at a distance of >34 meters (~ 120 feet)

A 500mw laser will be equivalent to a Class 3A at a distance of >70 meters (~250 feet)

David
__________________
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
davidgdg is offline   Reply With Quote
Old 03-31-2010, 11:44 AM #4
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,764
Rep Power: 42214
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is online now
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,764
Rep Power: 42214
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Line Laser Safety

That's good info for standard round beam Lasers David....
but he was asking about Line Lasers.. Like they use to
line up cuts in a saw mill or the hardware variety for lining
up a shelf with a level in it that projects a line rather
than a dot...

@ OP...Line Lasers that use Optics to create the line project
a line that is not linear in power across the line... The power
is greatest in the middle getting weaker as you go out from
the center of the line.
Scanning line lasers on the other hand... will have the same
power anywhere on the line since it is scanned across a
surface..


Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is online now   Reply With Quote
Old 03-31-2010, 01:24 PM #5
davidgdg's Avatar
Class 2 Laser
 
Join Date: Dec 2008
Location: London
Posts: 271
Rep Power: 16
davidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to behold
davidgdg davidgdg is offline
Class 2 Laser
davidgdg's Avatar
 
Join Date: Dec 2008
Location: London
Posts: 271
Rep Power: 16
davidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to beholddavidgdg is a splendid one to behold
Default Re: Line Laser Safety

Quote:
Originally Posted by lasersbee View Post
That's good info for standard round beam Lasers David....
but he was asking about Line Lasers.. Like they use to
line up cuts in a saw mill or the hardware variety for lining
up a shelf with a level in it that projects a line rather
than a dot...
Jerry
Hi Jerry. I was just commenting on the sun versus laser comparison. I'd guess that a line laser will rarely if ever pose an eye hazard. If you reckon on the line being 1mm by length of say 1m, then the radiance is down by a factor of 1000, compared to a spot .....
__________________
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
davidgdg is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 12:17 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC