Finding a Class I Laser Pointer for a Science Fair Experiment

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Discussion Overview

The discussion revolves around the selection of a Class I laser pointer for a science fair experiment, particularly in relation to replicating results similar to the double slit experiment. Participants explore the safety classifications of laser pointers and the feasibility of using different classes of lasers.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks guidance on where to find a Class I laser pointer, expressing a preference for not having to measure output to confirm the class.
  • Several participants note that many laser pointers are Class II, with some stating they have never seen a Class I laser pointer available commercially.
  • One participant suggests using an optical attenuator to reduce the intensity of a Class II laser pointer if a Class I is not available.
  • There is a discussion on the safety definitions of Class I lasers, with one participant stating that they are safe to look into for an indefinite time, while another clarifies that the classification is based on specific standards.
  • Participants discuss the differences between the old and new classification systems, noting that Class 1 is safe for viewing with optical instruments, while Class 2 relies on the blink reflex for safety.
  • One participant raises a question about whether attenuating a laser pointer would change its class, indicating uncertainty about the implications of altering the laser's intensity.

Areas of Agreement / Disagreement

Participants generally agree that Class I lasers are the safest option, but there is no consensus on the availability of such lasers or the implications of using Class II lasers with attenuation. Multiple competing views exist regarding the definitions and safety of laser classifications.

Contextual Notes

Participants express uncertainty about the availability of Class I lasers and the effects of using optical attenuators on laser classification. There are also references to differing familiarity with the old and new classification systems, which may affect interpretations.

Dembara
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I am doing some experimentation, for a science fair. And I want to make sure I the laser pointer I use is Class I (conceivably, I may change that, but any class of laser can be used to replicate results similar to the double slit experiment correct?). Can anyone direct me as to where I may be able to get one? Are commercial laser pointers generally class 1?
I could test them to see, by measuring output and all that, but I'd prefer not to go through that much effort if I can just get one that I know is of the correct class.

Thank you for any help, and sorry if this is in the wrong sub-forum, I didn't see any more appropriate.
 
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Many laser pointers are class 2. I don't think I've ever seen something that was labeled class 1.
 
Dembara said:
I am doing some experimentation, for a science fair. And I want to make sure I the laser pointer I use is Class I (conceivably, I may change that, but any class of laser can be used to replicate results similar to the double slit experiment correct?). Can anyone direct me as to where I may be able to get one? Are commercial laser pointers generally class 1?
I could test them to see, by measuring output and all that, but I'd prefer not to go through that much effort if I can just get one that I know is of the correct class.

Thank you for any help, and sorry if this is in the wrong sub-forum, I didn't see any more appropriate.
It looks like you are wanting to use a class 1 laser because it is the safest on the rating scale, right? https://en.wikipedia.org/wiki/Laser_safety

If you cannot find a class 1 laser pointer, just use an optical attenuator to decrease the intensity of a class 2 laser pointer...
 
Dembara said:
I am doing some experimentation, for a science fair. And I want to make sure I the laser pointer I use is Class I (conceivably, I may change that, but any class of laser can be used to replicate results similar to the double slit experiment correct?). Can anyone direct me as to where I may be able to get one? Are commercial laser pointers generally class 1?
I could test them to see, by measuring output and all that, but I'd prefer not to go through that much effort if I can just get one that I know is of the correct class.

Thank you for any help, and sorry if this is in the wrong sub-forum, I didn't see any more appropriate.

AFAIK, laser pointers are class II or higher devices, I have never seen a class I laser.
 
Class 1 means it's safe enough to look into, or it has enough engineering guards such that you can't look into it.
 
Khashishi said:
Class 1 means it's safe enough to look into, or it has enough engineering guards such that you can't look into it.

Not exactly- a class I light source, defined by ANSI Z136, means it's safe to look directly into the beam for an indefinite amount of time (I believe the specific number is 8 hours). The sun is too bright to be a class I, and actually delimits between class II (eye aversion response is sufficient) and class III (injury possible). It's worth mentioning that I'm more familiar with the 'old' system rather then the 'new' system.
 
The new system is nearly the same. If I recall. Class 1 is safe for viewing intrabeam even with optical instruments. 1M is potentially dangerous if viewed trough magnification. With class 2 the blink reflex is safe to prevent hazard for light in the visible range and any emissions outside the visible spectrum must be class 1. 2M is the same as 2 but is a hazard if magnified. most laser pointers still go by the old system though, I believe.
 
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berkeman said:
If you cannot find a class 1 laser pointer, just use an optical attenuator to decrease the intensity of a class 2 laser pointer...
So our OP seems to be MIA, but couldn't you make the science fair project a lot safer by attenuating the laser pointer beam? Heck, just use sunglasses to attenuate the beam. You still get an interference pattern, right?
 
berkeman said:
So our OP seems to be MIA, but couldn't you make the science fair project a lot safer by attenuating the laser pointer beam? Heck, just use sunglasses to attenuate the beam. You still get an interference pattern, right?

Sorry I did not get back to you. I want to use a Class I as it doesn't require paperwork for the science fair (and I'm allowed to bring it to the actual fair, without going through a long process). Would attenuating the laser pointer actually change the class? I'd assume altering the laser or strength enough would, correct?
 

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