Optical output and Luminens?

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Offline Samnang

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Optical output and Luminens?
« on: 24/06/2015 21:44:22 »
I am confused about laser optical output and luminens. Is there any relation between the two?
Also, what is the maximum laser optical output that won't damage anything, not even paper?

Thanks

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Offline chiralSPO

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Re: Optical output and Luminens?
« Reply #1 on: 24/06/2015 22:07:45 »
damage will depend on the intensity, the frequency (color of light) and the target it's interacting with (the color and stability of the target)

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Offline alancalverd

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Re: Optical output and Luminens?
« Reply #2 on: 25/06/2015 07:50:53 »
A lumen is

Quote
the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela

However since the output of a laser is usually monochromatic and non-divergent, it is generally more convenient to quantify it as for radiofrequency or microwave radiation, either in watts (for the whole beam) or watts/square meter for the part that actually hits a target.

Lasers are classified for safety purposes based on their potential for causing injury to human eyes and skin. The class of a device depends on its maximum and average power and also its spectrum. In general a Class 1 laser is unlikely to damage anything, whereas Class 4 is unlimited and includes cutting machines and weapons. 
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Offline Samnang

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Re: Optical output and Luminens?
« Reply #3 on: 28/06/2015 15:44:17 »
Thanks and sorry for late reply. And I have another question. Suppose a white light laser can be obtained by combining Red, Green and Blue lasers and I shoot it thru a transparent color glass(1/2, 1/4 red per example, what color will I get? Or can a manufacture company such as Rosco produce Permacolor Dichroic Filters with 1/2,1/4 etc.. of the Red, Green, Blue?

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Offline chiralSPO

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Re: Optical output and Luminens?
« Reply #4 on: 29/06/2015 22:45:04 »
Thanks and sorry for late reply. And I have another question. Suppose a white light laser can be obtained by combining Red, Green and Blue lasers and I shoot it thru a transparent color glass(1/2, 1/4 red per example, what color will I get? Or can a manufacture company such as Rosco produce Permacolor Dichroic Filters with 1/2,1/4 etc.. of the Red, Green, Blue?

I'm not exactly sure what you mean, and whether a laser would be the best way to test this...

You could also effectively generate a "white" laser pulse by producing a femtosecond laser pulse that is broad enough to cover the visible region.
https://en.wikipedia.org/wiki/Ultrashort_pulse
http://www.thenakedscientists.com/forum/index.php?topic=44748.0

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Offline alancalverd

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Re: Optical output and Luminens?
« Reply #5 on: 30/06/2015 00:29:55 »
Combining RGB lasers is effectively the same process as generating a color TV image from a 3-gun CR tube. There are a few commercial systems in existence.
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Offline Samnang

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Re: Optical output and Luminens?
« Reply #6 on: 30/06/2015 14:51:32 »
I saw some laser light show on Youtube and their combined light from red,green and blue laser has only a few color which is far from 16 million colors. Also, I came across this review about how Sony came up with laser color schemes for its VLP projector.  But I still don't understand how they get 16 million color. I understand only how to mix red,green and blue to make any one of the 16 million color in graphic programming.

newbielink:ftp:// [nonactive] newbielink:http://www.ravepubs.com/sonys-new-laser-technology [nonactive]