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Old 09-15-2010, 01:06 AM #1
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Default Unfocused laser beam.

Is an unfocused 300mW 650nm laser safe to look at? I'm not talking about shining it in my eyes or anything, but what about using it as a pointer?


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Old 09-15-2010, 01:51 AM #2
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Default Re: Unfocused laser beam.

the more spread out the beam is the less the intensity of the light at a given point.
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Old 09-15-2010, 01:52 AM #3
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Default Re: Unfocused laser beam.

You're planning on using a 300mW red laser as a pointer? Also, by unfocused, do you mean without a second collimating lens to focus the laser, or without the primary collimating lens that tightens the beam?
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Old 09-15-2010, 01:57 AM #4
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Default Re: Unfocused laser beam.

Quote:
Originally Posted by jedirock View Post
You're planning on using a 300mW red laser as a pointer? Also, by unfocused, do you mean without a second collimating lens to focus the laser, or without the primary collimating lens that tightens the beam?
Not planning, just wondering, and without the collimating lens or with the point focused to infinity.
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Old 09-15-2010, 01:29 PM #5
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Default Re: Unfocused laser beam.

I'm curious, what's the difference between a collimated beam and one focused to infinity?

I think with 300mW you'd have a huge dot before it's relatively safe. If you use it as a pointer, why not a lower power? points just as good.
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Old 09-15-2010, 02:02 PM #6
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Default Re: Unfocused laser beam.

Yeah to have a 300mW safe it would be more like a spot light rather than a pointer.
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Old 09-15-2010, 03:22 PM #7
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Default Re: Unfocused laser beam.

Alright, thanks for the help everyone.
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