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Old 10-27-2009, 04:40 PM   #1
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Lightbulb Distance Experiments


Distance Experiments

hi all, this might already be covered somewhere else on the forum i'm sure someone must of thought of this before, if so my apologies (suppose links will follow) but I was just wondering if any of you have some links to video clips where; from a high altitude fixed position someone blasts a laser across the night sky and someone else travels to it's furthest point to get an approximate (or as accurate as possible) REAL distance that these various high powered beauties can achieve? i've tried looking for similar type videos on youtube but couldn't find any.

if not maybe we could use this thread to kick off such experiments? I suppose apart from the obvious requirement, a nice dark sky, one or 2 devices to capture the video, a willing friend/s and a full tank of petrol lol

my laser is on order so i will have to wait until it's received before posting my contribution but if any of you guys are up for the challenge it would be interesting to see the results....

hurps
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Old 10-27-2009, 04:52 PM   #2
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Default Re: Distance Experiments

Interesting topic, I have wondered about this before...I have recently received a 200 mW green from rayfoss, and I am still waiting for a DX true 50 mW green and a custom built 8x blu-ray approx 350-400 mW (to be decided later), so I would be up for taking part in any experiments and/or contributing to this thread. I notice that you live in Wales, which part?
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Old 10-27-2009, 04:56 PM   #3
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Default Re: Distance Experiments

YouTube - Hulk 175mW Green Laser at 5 Miles!!!
YouTube - Green Laser Light from almost 2 miles away!
YouTube - Green Laser 2 miles

YouTube - 20 Miles Laser Experiment

Some videos of distance shots..
But nothing to find the end point at which the laser is visible.

i wonder if a handheld could go across the english channel
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Old 10-27-2009, 05:06 PM   #4
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Default Re: Distance Experiments

Quote:
Originally Posted by hurplegrappers View Post

Distance Experiments

hi all, this might already be covered somewhere else on the forum i'm sure someone must of thought of this before, if so my apologies (suppose links will follow) but I was just wondering if any of you have some links to video clips where; from a high altitude fixed position someone blasts a laser across the night sky and someone else travels to it's furthest point to get an approximate (or as accurate as possible) REAL distance that these various high powered beauties can achieve? i've tried looking for similar type videos on youtube but couldn't find any.

if not maybe we could use this thread to kick off such experiments? I suppose apart from the obvious requirement, a nice dark sky, one or 2 devices to capture the video, a willing friend/s and a full tank of petrol lol

my laser is on order so i will have to wait until it's received before posting my contribution but if any of you guys are up for the challenge it would be interesting to see the results....

hurps

Light travels an infinite distance with no attenuation in a vacuum. This means that the only limiting factors are impurities in the atmosphere and spreading of energy due to the divergence of the beam (divergence is not the same as attenuation. Divergence means the photons spread apart as they travel, meaning less of them will reach a target sensor as they will have expanded to an area larger than the receiving sensor area). Photons from a 5mW laser source can be detected at extremely large distances from the source with sensitive enough equipment. If photons from the laser source reach the vacuum of space they have the potential to travel infinitely far from the source if traveling a pure vacuum and given enough time.

Suffice it to say, photons can easily travel massive distances.
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Old 10-27-2009, 05:23 PM   #5
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Default Re: Distance Experiments

Quote:
Originally Posted by Dusty View Post
Interesting topic, I have wondered about this before...I have recently received a 200 mW green from rayfoss, and I am still waiting for a DX true 50 mW green and a custom built 8x blu-ray approx 350-400 mW (to be decided later), so I would be up for taking part in any experiments and/or contributing to this thread. I notice that you live in Wales, which part?
nice1 dusty good to hear you're up for having a go, btw i live in a small village the nearest town being pontypridd (where tom jones is from hehehe) the village i live in is in the grip of x-factor fever at the moment because it's the same place young lloyd daniels is from lol bless he's only 16.

Quote:
Originally Posted by Elgranto7 View Post

Some videos of distance shots..
But nothing to find the end point at which the laser is visible.

i wonder if a handheld could go across the english channel
lol @ english channel.. you'll need more than a tank of petrol for that one dude, funny.. thanks for the links but you're right, none have filmed the point where the laser fades away (or as close to it as possible)... maybe that's where we can make this experiment different, more emphasis on finding the end of the beam or point of serious fade.
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Old 10-27-2009, 05:32 PM   #6
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Default Re: Distance Experiments

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Originally Posted by ElektroFreak View Post
Light travels an infinite distance with no attenuation in a vacuum. This means that the only limiting factors are impurities in the atmosphere and spreading of energy due to the divergence of the beam.
yeah man suppose your right, atmos & light (i.e moon, fog, drizzle etc) conditions would play a huge roll.. taking this into account is it really worth doing then? sorry i dunno coz i'm new to all this and you sure sound like you know what you're talking about. i suppose posting the general light & atmos conditions in the findings/results would give us a better idea though. maybe also camera/video capture device used?

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Old 10-27-2009, 07:26 PM   #7
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Default Re: Distance Experiments

Get two hot air balloons and let one shine a laser at another.
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Old 11-04-2009, 11:47 AM   #8
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Default Re: Distance Experiments

What about a test to see how far "the beam" can be seen? I live in the Smoky Mountains so the air quality is always good for night lasing. I got a Led Shoppe 50mW coming so I will try to record a test on how far the beam (not the dot) can be seen. i shot the Optotronics 50mW down my neighborhood's main street which is over 100 yards long and my neighbor easily saw the beam about 20 feet in front of him. He said it continued into the forest (another 20 yards) until the dot was hitting trees. He also said the dot was smaller than golf ball size and even though it was hitting the bark on the trees which absorbs some of the light, it was just too bright to look at.
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Old 11-04-2009, 12:37 PM   #9
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Default Re: Distance Experiments

Me and laze_doctor did an experiment like this. I went to the top of a large hill and shined my RPL-300 down at a wide road about 2km away. He went down to the road and observed the dot, it was about 1m wide I think.

I never saw the dot, so you'd need to ask laze_doctor what it looked like, lol. Apparently the beam was insanely visible.
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Old 11-04-2009, 01:38 PM   #10
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Default Re: Distance Experiments

here ya go!
YouTube - Lichtkunst Light Art Mind Blowing 20 Mile Outdoor Laser Beam
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Old 11-04-2009, 01:52 PM   #11
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Default Re: Distance Experiments

Using a telescope as a beam expander will help you to get the laser over 10 or miles easily even it's 200mW
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Old 11-04-2009, 02:02 PM   #12
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Default Re: Distance Experiments

Beam visibility is dependent on airborne particles (called aerosols) that reflect the light and make the beam visible. The aerosol layer ends less than 5000 ft above us. Therefore, a visible laser beam directed straight upward can only be seen to extend about that far before it abruptly ends. A 20 mile visible beam can therefore only exist if the laser is projected almost perfectly horizontally.
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Old 11-04-2009, 02:21 PM   #13
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Default Re: Distance Experiments

This has been something I've been wanting to test myself but never had the time or the right area in which to do it. Someday soon I hope I can though.
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Old 11-04-2009, 02:28 PM   #14
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Default Re: Distance Experiments

Quote:
Originally Posted by Kenom View Post

Those beams starting at 1:50 in that video are crazy but that's a huge freakin' laser right? 8-16 Watt Lasers? How many mW's in a Watt, 1,000,000?
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Old 11-04-2009, 02:37 PM   #15
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Question Re: Distance Experiments

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Originally Posted by Gsquared18 View Post
How many mW's in a Watt, 1,000,000?
Huh, are you asking seriously ?

MILLIwatt = 1/1000 of watt = 1000 milliwatt for a watt.

1.000.000 is for microwatt
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Old 11-04-2009, 02:41 PM   #16
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Default Re: Distance Experiments

This are the kind of questions that I can't hold.

Let me google that for you
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Old 11-04-2009, 03:27 PM   #17
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Default Re: Distance Experiments

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Huh, are you asking seriously ?

MILLIwatt = 1/1000 of watt = 1000 milliwatt for a watt.

1.000.000 is for microwatt
Yeah, yeah I knew that, I was just testing you. You passed!!!
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Old 11-04-2009, 03:34 PM   #18
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Talking Re: Distance Experiments

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Yeah, yeah I knew that, I was just testing you. You passed!!!
LOL

Then let me test you ..... what is more high, 100 femtowatt, or 10 eptawatt ?

j/k
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Old 11-04-2009, 05:33 PM   #19
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Default Re: Distance Experiments

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LOL

Then let me test you ..... what is more high, 100 femtowatt, or 10 eptawatt ?

j/k

Easy! Without question, 10 Petawatt. 1 Petawatt = (10^30) Femtowatts.
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Old 11-04-2009, 05:48 PM   #20
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Talking Re: Distance Experiments

Wrong reply ..... cause the question was involving eptawatt, not petawatt

(no, it was not a typo ..... mega, giga, tera, penta, exa, epta ..... and so on )

LOL !
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Old 11-04-2009, 06:48 PM   #21
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Default Re: Distance Experiments

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Old 11-05-2009, 01:03 AM   #22
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Default Re: Distance Experiments

Crap!! I copied and pasted your question into Yahoo Answers and some guy named Rajashekhar Shivaram Sharma provided that answer. With a name like that, I figured he had to be right.
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Old 11-05-2009, 01:45 AM   #23
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Default Re: Distance Experiments

Attached are photos of >600mW pointed at some hills approximately 1.78miles away. These photos are pretty much as close as I could get to reality. Not the best camera. This laser is BRIGHT!
I have video, but my video camera is so old... it uses video cassettes.
The spot is easily visible. No beam expander, about 0.8mRad divergence.
I'll be doing some ~10 mile experiments when I have some time.
Edit: The last picture is a beam shot at about 5:30pm where I live. No exposure tricks. Yes... the beam IS fairly visible before dusk, with clear air!
Attached Thumbnails
Distance Experiments-dsc09992a.jpg   Distance Experiments-dsc09989a.jpg   Distance Experiments-dsc09976a.jpg  

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Old 11-05-2009, 11:10 AM   #24
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Default Re: Distance Experiments

Quote:
Originally Posted by RA_pierce View Post
Attached are photos of >600mW pointed at some hills approximately 1.78miles away. These photos are pretty much as close as I could get to reality. Not the best camera. This laser is BRIGHT!
I have video, but my video camera is so old... it uses video cassettes.
The spot is easily visible. No beam expander, about 0.8mRad divergence.
I'll be doing some ~10 mile experiments when I have some time.
Edit: The last picture is a beam shot at about 5:30pm where I live. No exposure tricks. Yes... the beam IS fairly visible before dusk, with clear air!
Great pics RA thanks! Is that last one pointed at the moon or sun or is that the dot?
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Old 11-05-2009, 04:44 PM   #25
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Default Re: Distance Experiments

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Originally Posted by Gsquared18 View Post
Great pics RA thanks! Is that last one pointed at the moon or sun or is that the dot?
That is the moon.
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