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Thread: Laser Safety

  1. #1
    Join Date
    Feb 2005
    Location
    Florida
    Posts
    802

    Default Laser Safety

    I am going to stress this point from time to time..

    Please... Everyone

    Make damn sure you have proper eye protection for yourself and for your guests.
    Even if its at your home..

    There are many types of Glasses and Goggles out there that will do the job.
    Just make sure they are an approved design..
    I mean make sure that they are designed for the wavelength and the power
    your going to use your laser(s) at.

    I could go into more detail..(others can step in here as well)
    But just remember the Optical Density rule..
    OD 1 (Optical Density) or ( Attenuation Factor) for a reduction of 10
    that means a 100mW laser will be reduced to your eyes by a factor of 10 or 10mW.
    OD 2 for a factor of (100) , OD 3 for a factor of (1000), OD 4 (10,000) and so on.
    I suggest going for an OD of 7 good for 1W and work your way from there.

    See this link http://www.osha.gov/SLTC/etools/eyea...html#Selection

    This is what determines if those goggles are up to the job..powerwise.
    They can be expensive... I know . Some look stupid..So What.!
    They are not comfortable ..Yeah I know but...
    But let this be your first priority
    You only have one set of eyes..And that lasershow will be useless to you if you cant see it !!!
    Dont let them just sit in the box..Hang them in a dust proof box for all to see.
    That way you will always remember to put them on..get in the habit.
    You may See Max and I demo a static beam from time to time.. But be assured this is only for the picture in a controlled enviroment.
    We dont have kids and animals running around when we do this.
    Be sure that goes for your demo's as well..
    How about we talk about the different styles of GoGGles we have and what you paid for them.
    This way newcommers will benifit by your experience.
    Thanks All

    End of Transmission.... For Now
    "My signature has been taken, so Insert another here"
    http://repairfaq.ece.drexel.edu/sam/laserfaq.htm
    *^_^* aka PhiloUHF

  2. #2
    Join Date
    Nov 2005
    Posts
    81

    Default cool specs

    I just got a pair of these from Dean at Nitelight Lasers....

    http://cgi.ebay.com/ARGON-LASER-SAFT...QQcmdZViewItem

    $45 = good protection against my argon.

    I think they're quite stylish as well.

  3. #3
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario, Canada
    Posts
    489

    Default

    Those laser goggles are good and you got a nice price too. Try buying those at Edmund Scientific or even directly from a manufacturer and you can pay up to $400 a pair.
    I have some for He-Ne, some for Argon, some for ND-YAG and some for DPSS 532 plus some general purpose ones to align visible Ion laser and brighten up gloomy days If I wear them ouside

    Dean Glassburn is a good guy to deal with but hard to get a hold of sometimes.

    I got my first Lexel 88 argon laser from Dean.

    Rick
    Profile Redacted by Admin @ 04.24.2010

  4. #4
    Join Date
    Mar 2006
    Posts
    5

    Default

    Hi,

    I bought a pair of Barr and Stroods, they seem quite good for my low power Greens. If I remember correctly they have an OD of 4, which should be safe up to the 150Mw range, and a pass band from 550nm to 670nm or so. They should be OD4 for 808nm, though I'm less sure of their stopping power at 1064nm I'd consider them OD3 at that wavelength. I've seen a transmission graph for them at Wicked.

    http://forum.wickedlasers.com/viewto...highlight=barr

    Have a good one, and thanks for all the knowledge Marconi.
    Shawndoe

  5. #5
    Join Date
    Jul 2005
    Location
    Tampa Florida
    Posts
    492

    Default OD 2 Is a Good compromise...

    Hi All,
    Laser eyewear is important and we should all probably be a little more careful so it is good to have a reminder message from time to time. Here at the USF Physics department I have seen a graduate student completley flashblinded in both eyes for about half an hour by one pulse from a doubled Nd:YAG reflecting off of another students forearm...no kidding. He did recover with no long term damage...very lucky. Having said all this...OD 2 is a good choice for most laser light show work. With OD2 500 mW becomes a 5 mW flash in the eye if you get careless but you can still see the laser beam to work. Opinions?
    Phil Bergeron 142laser here and on e bay also
    Phil Bergeron( AKA 142laser)

  6. #6
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,693

    Default

    Speaking of safety,

    I would go as far as saying, if your laser projector is going to be used with other people than you exposed to it, Scanner safety would be a very wise idea, especially in these days of litagation.
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  7. #7
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,506

    Default

    Scanner safety? If you've got the projector positioned to comply with CDRH regs regarding beam height, then a scanner failure shouldn't be a problem. (Unless your projector output window isn't masked to prevent beams from exiting the projector at unnaturally low angles that could be caused by a rotor failure...)

    If you're doing commercial stuff, then maybe I could see the utility... But even then, I'd rather rely on masking and projector positioning than a safety circuit.

  8. #8
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,693

    Default

    Quote Originally Posted by Buffo
    Scanner safety? If you've got the projector positioned to comply with CDRH regs regarding beam height, then a scanner failure shouldn't be a problem. (Unless your projector output window isn't masked to prevent beams from exiting the projector at unnaturally low angles that could be caused by a rotor failure...)

    If you're doing commercial stuff, then maybe I could see the utility... But even then, I'd rather rely on masking and projector positioning than a safety circuit.
    You are only speaking from a USA point of view. Not all of us around here are Americans
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  9. #9
    Join Date
    Jan 2005
    Location
    USA
    Posts
    457

    Default

    You are only speaking from a USA point of view. Not all of us around here are Americans
    Yea man... The CDRH really mucks up good displays... If im not miskaken, over in Europe they have just have "guidelines" to fallow... And they are not even 1/10th as insane as US regulatory requirements.

    Saw a great video from a club Epsilon in Poland...

    http://www.download17.vel.pl/letsmix.mpg

    Thats how shows should be

  10. #10
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,506

    Default

    You are only speaking from a USA point of view. Not all of us around here are Americans
    Ahhhh hell! You're absolutely right. Sorry Dave. ops:

    I keep forgetting that in some parts of the world you can still do audience scanning. Damn - wish we could do it here.

    I saw a killer show in a small auditorium downtown about 5 years ago. The guy had expanded the beam from one of his whitelight lasers to nearly 2 inches in diameter, and had it bouncing all over the room. I kept wondering if he was planning on scanning the audience with it.... (Why else go through the hassle to expand the beam like that?) But he never did.

    Adam

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