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12-21-2014, 08:50 PM #17
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Re: You can't see laser beams in space.

I've seen a photo of a 1 watt blue laser as viewed from the ISS, nice blue dot which did well for being so low power compared to the rest of the lights in the city nearby. I will have to get my wife to point my laser straight up some night while I am viewing from a couple of miles away to know if I can see it. Maybe I will take a drive up the mountain side and have her sweep towards me and above to see if the beam is visible a few miles away.

Edit:

From: http://www.dvice.com/archives/2012/0..._blasts_th.php

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Laser Safety:
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Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

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Last edited by Alaskan; 12-21-2014 at 08:57 PM.

12-21-2014, 08:53 PM #18
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WriggleyTinn
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Re: You can't see laser beams in space.

Last edited by WriggleyTinn; 12-21-2014 at 08:59 PM.

12-21-2014, 08:58 PM #19
 Class 3B Laser Join Date: Jan 2014 Location: Deployed to Iraq Posts: 4,229 Rep Power: 2059
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Re: You can't see laser beams in space.

I edited my post with the same info about the same time you posted, I guess.

Edit again: Oh, yours is a video of the event, thanks!
__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

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Last edited by Alaskan; 12-21-2014 at 09:02 PM.

12-21-2014, 09:13 PM #20
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WriggleyTinn
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Re: You can't see laser beams in space.

I live reasonably high up a hillside here and know most of my view.... a friend asked me to shine my 200mw green laser towards his house 3 mile away... and when I heard him say "Wow... the tree is twinkling with loads of green particles" I knew he could see it and was amazed myself.....

12-22-2014, 07:41 AM #21
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Dr_Evil
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Re: You can't see laser beams in space.

The RPL I'm trying to sell will hit this water tower with no problem. It is about 1.5 miles away from my house. I haven't tried anything else yet. The dot from the RPL is still quite visible from my end.

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12-22-2014, 05:49 PM #22
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WriggleyTinn
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Re: You can't see laser beams in space.

Forgive me if I'm wrong but wouldn't a dot at 1.5 miles at a divergence of 1.5mrad be around 3.5 meters... or 2,3 meters @ 1mrad?.... still a good distance on a 20mW Mr Evil

12-22-2014, 07:10 PM #23
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Teej
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Re: You can't see laser beams in space.

Are we diverging from the visibility of the beam in space, to the visibility of the dot?

12-22-2014, 07:17 PM #24
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WriggleyTinn
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Re: You can't see laser beams in space.

Indeed Teej, I believe we are.... One must apologise for being diverse in deviating from the course of the thread... Please consider my wrists slapped
:-D

12-22-2014, 09:33 PM #25
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Dr_Evil
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Re: You can't see laser beams in space.

Quote:
 Originally Posted by WriggleyTinn Forgive me if I'm wrong but wouldn't a dot at 1.5 miles at a divergence of 1.5mrad be around 3.5 meters... or 2,3 meters @ 1mrad?.... still a good distance on a 20mW Mr Evil
The RPL, not the 20mW.
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543 - GreeNe
532 - Optotronics RPL-260, Optotronics Pen ~20mW
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488 - Novalux
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12-23-2014, 02:05 AM #26
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The Lightning Stalker
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Re: You can't see laser beams in space.

Here is just xactly what the fax is.

The only source of the video is some nobody
YouTube channel full of 'UFO vidoes'.

OPALS operates at 1550nm. The camera
wouldn't pick it up. No one would see it.
Furthermore, it is only a measly 2.5W. I
have used a 1500nm laser and can verify this.

One time I saw a red point of light shoot
across the sky. A few minutes later,
another red point of light, possibly even
the same one, shot across the sky again,
following the exact same path. I have no
proof and cannot be sure it was actually
there.

12-23-2014, 05:23 AM #27
 Class 2M Laser Join Date: Oct 2013 Location: NewBrunswick, Canada Posts: 895 Rep Power: 296
Blarg King
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Re: You can't see laser beams in space.

Question: Would a laser have better divergence in space/vacuum since there would be no atmosphere?
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12-23-2014, 06:04 AM #28
 Class 3B Laser Join Date: Jan 2014 Location: Deployed to Iraq Posts: 4,229 Rep Power: 2059
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Re: You can't see laser beams in space.

Humm... I wonder how much our atmosphere affects divergence compared to a vacuum or is it purely a function of the device? My guess is they are completely unrelated, yet, atmosphere does bend light to some degree, maybe negligible unless at an angle across the horizon..
__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

Last edited by Alaskan; 12-23-2014 at 06:12 AM.

12-23-2014, 11:03 AM #29
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WriggleyTinn
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Re: You can't see laser beams in space.

Am I getting something wrong here.... Isn't it the lens that is responsible for the divergence of the beam (collimating lenses).

Nice laser you have there Dr Evil, the RPL, some pretty good stats with it :-
"Beam divergence (full angle) <1.00 mrad typically <0.9 mrad (Lowest true divergence in the industry)"

12-23-2014, 11:29 AM #30
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WriggleyTinn
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Re: You can't see laser beams in space.

[QUOTE=
OPALS operates at 1550nm. The camera
wouldn't pick it up. No one would see it.
Furthermore, it is only a measly 2.5W. I
have used a 1500nm laser and can verify this.

[/QUOTE]

Hmmnnn.... A camera will pick up 980nm light, you can try this yourself:-
Hold the led window of a standard tv remote to the lens of your phone camera and press a button and you will see it light up.
With this I question the fact a camera wouldn't pick up a high powered laser at 1500nm and would think a direct hit to a camera would cause total "white out".... IMHO.. but I may be proved wrong

12-23-2014, 11:35 AM #31
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Pi R Squared
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Re: You can't see laser beams in space.

Quote:
 Originally Posted by The Lightning Stalker Here is just xactly what the fax is. The only source of the video is some nobody YouTube channel full of 'UFO vidoes'. OPALS operates at 1550nm. The camera wouldn't pick it up. No one would see it. Furthermore, it is only a measly 2.5W. I have used a 1500nm laser and can verify this. One time I saw a red point of light shoot across the sky. A few minutes later, another red point of light, possibly even the same one, shot across the sky again, following the exact same path. I have no proof and cannot be sure it was actually there.
If you can't be sure it was actually there then you can't be sure you even saw it can you? It was probably just two meteors burning in. I know meteors are usually white light but there are red, orange, and green ones too, also slower moving green fireballs. The color is probably due to whatever it's made of. There is also man made space junk reentering from time to time too.

After viewing the video again it looks more like something in space is being illuminated by a laser from earth or from lower in the atmosphere, although that too seems unlikely to me.

Alan
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12-23-2014, 12:03 PM #32
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starlight
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Re: You can't see laser beams in space.

Quote:
 Originally Posted by Laser Project I've seen a photo of a 1 watt blue laser as viewed from the ISS, nice blue dot which did well for being so low power compared to the rest of the lights in the city nearby. I will have to get my wife to point my laser straight up some night while I am viewing from a couple of miles away to know if I can see it.
I made a video about 5 years ago of myself shining a 75mW green laser at my brother who was just over 5 miles away.

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Last edited by starlight; 12-23-2014 at 12:07 PM.

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