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Old 04-16-2014, 09:49 AM #1
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Smile Propagating beams

Hello, would any one happen to know how in laser shows they get what is usually seen as a solid laser beam to fool the eye in to looking like it is propagating outward? like instead of being the usual solid beam from emitter to the ending collision point, you instead see the beam end or/or begin in mid air and this non continuous beam segment moves in a direction.
my background in physics is limited to high school they did cover wave interference and wave/particle theory and such but most of that is long forgotten now!



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Old 04-16-2014, 10:51 AM #2
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Default Re: Propagating beams

Go on youtube and search for nike watershow. This is what you mean. I don't know with which technologic this is made but it looks great.
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Old 04-16-2014, 11:09 AM #3
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Default Re: Propagating beams

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Originally Posted by The Qube View Post
Go on youtube and search for nike watershow. This is what you mean. I don't know with which technologic this is made but it looks great.
nike watershow doesnt seem to show much but nike shoes being dunked in water! also i took a look at one water fountain laser show on youtube, looks like the localized water mist gives a sort of floating beam effect but this is not what i am talking about, the beams z axis is controllable through a medium like smoke, it can move through it on the z axis. have seen it on some tiesto laser shows
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Old 04-16-2014, 12:15 PM #4
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Default Re: Propagating beams

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Originally Posted by BubonicCronic View Post
You might mean a Scrim.



Its basically shear netting.

You can get 3D effects by using multiples.

Tiesto Pre?ov 2010 Laser Show by MINISTRY Rental Service - YouTube you see the green lasers at that time code 5:8 ish they are moving on their z axis linearly
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Old 04-16-2014, 03:54 PM #5
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Default Re: Propagating beams

cameras do funny things to pulsing light.
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Old 04-16-2014, 09:40 PM #6
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Default Re: Propagating beams

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Originally Posted by dins117 View Post
you see the green lasers at that time code 5:8 ish they are moving on their z axis linearly
This is an artifact of the camera caused by rolling shutter.
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Old 04-17-2014, 12:15 PM #7
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Talking Re: Propagating beams

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Originally Posted by dins117 View Post
Hello, would any one happen to know how in laser shows they get what is usually seen as a solid laser beam to fool the eye in to looking like it is propagating outward? like instead of being the usual solid beam from emitter to the ending collision point, you instead see the beam end or/or begin in mid air and this non continuous beam segment moves in a direction.
my background in physics is limited to high school they did cover wave interference and wave/particle theory and such but most of that is long forgotten now!
An easy way is to use a haze in the air, generated smoke effects for example, to create something for the laser to excite. In clean air, the beams are not really visible, especially at distance...so the beam "Appears" when its passing through something that gives that air glow, and, that can then make it appear as though the beam started or ended at the boundaries of the smoke, etc.

For this type of thing, you would not need heavy smoke, so little would be needed it could be quite subtle.

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Old 04-17-2014, 06:25 PM #8
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Default Re: Propagating beams

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Originally Posted by Teej View Post
An easy way is to use a haze in the air, generated smoke effects for example, to create something for the laser to excite. In clean air, the beams are not really visible, especially at distance...so the beam "Appears" when its passing through something that gives that air glow, and, that can then make it appear as though the beam started or ended at the boundaries of the smoke, etc.

For this type of thing, you would not need heavy smoke, so little would be needed it could be quite subtle.
You mean something like this: https://www.youtube.com/watch?v=gS0s...sn0vdR7fkgjuIA
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