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Old 05-05-2017, 01:35 PM #1
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Default Very low laser beam divergence

Here's a video using a laser to prove the earth is flat (it ain't), but the reason I posted this is it shows what a low diverging beam the spot size looks like at some distance.
Start watching at 13 minutes.
https://www.youtube.com/watch?v=GBhDFO4NMrw

Optical and laser specifications: Laser: 3W laser adjustable collimator 0.08mRad divergence


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Old 05-05-2017, 02:06 PM #2
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Default Re: Very low laser beam divergence

Quote:
Originally Posted by steve001 View Post
Here's a video using a laser to prove the earth is flat (it ain't), but the reason I posted this is it shows what a low diverging beam the spot size looks like at some distance.
Start watching at 13 minutes.
https://www.youtube.com/watch?v=GBhDFO4NMrw

Optical and laser specifications: Laser: 3W laser – adjustable collimator – 0.08mRad divergence
Nice find -special purpose made low divergence set up, for sure.

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Old 05-05-2017, 03:44 PM #3
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Default Re: Very low laser beam divergence

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Originally Posted by Encap View Post
Nice find -special purpose made divergence for sure.

Your average DPSS green with a 10x BE should be able to get to 0.08mRad without much trouble. Will need to give that video a watch later though, at the very least it'll be a good laugh.
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Old 05-05-2017, 04:02 PM #4
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Default Re: Very low laser beam divergence

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Originally Posted by diachi View Post
Your average DPSS green with a 10x BE should be able to get to 0.08mRad without much trouble. Will need to give that video a watch later though, at the very least it'll be a good laugh.
Are you sure? With your average 1- 1.5 mrd 532nm green dpss laser a 10x would give a beam reduction 10x less or 0 .1- 0.15 mrd. You'd have to use a 100x beam expander to get down to such low divergence as seen in the video.
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Old 05-05-2017, 04:06 PM #5
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Default Re: Very low laser beam divergence

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Originally Posted by steve001 View Post
Are you sure? With your average 1- 1.5 mrd 532nm green dpss laser a 10x would give a beam reduction 10x less or 0 .1- 0.15 mrd. You'd have to use a 100x beam expander to get down to such low divergence as seen in the video.

0.8mRad is low for sure, but far from unheard of for a green DPSS, maybe not the super cheap china jobs, but even they have rather good divergence. 10x would bring that down to 0.08mRad. 100x Would bring your 1mRad beam down to 0.01mRad.

That said, at 3W that's pretty impressive. But looking at the video, they're using a real big DPSS unit with a BE on the end. Probably dropped a large amount of cash for that setup...
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Old 05-05-2017, 04:26 PM #6
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Default Re: Very low laser beam divergence

All it takes is a temperature gradient to throw their measurements off.
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Old 05-05-2017, 04:43 PM #7
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Default Re: Very low laser beam divergence

Quote:
Originally Posted by Alaskan View Post
All it takes is a temperature gradient to throw their measurements off.

Yep, and I don't particularly trust their methods either... Doesn't seem at all accurate.
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Old 05-05-2017, 04:58 PM #8
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Default Re: Very low laser beam divergence

Watched that whole video and it's easily bs. Air temperature bends light, and with such precise measurements of only a meter or two, at 800-2000 meters away, the slightest thing can change that including air temperature. I've also heard of mirage effects and things like that bending light around the earth from ships behind the horizon.
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Old 05-05-2017, 08:39 PM #9
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Default Re: Very low laser beam divergence

That's a nice video IMO, not because of the experiment, but because of laser they used and showed it how the dot looks in various far distances during a day.
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Old 05-05-2017, 09:13 PM #10
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Default Re: Very low laser beam divergence

Quote:
Originally Posted by Alaskan View Post
All it takes is a temperature gradient to throw their measurements off.
Quote:
Originally Posted by diachi View Post
Yep, and I don't particularly trust their methods either... Doesn't seem at all accurate.
Quote:
Originally Posted by Crazlaser View Post
Watched that whole video and it's easily bs. Air temperature bends light, and with such precise measurements of only a meter or two, at 800-2000 meters away, the slightest thing can change that including air temperature. I've also heard of mirage effects and things like that bending light around the earth from ships behind the horizon.
Agree, inaccurate pseudoscience based delusional flat earther belief BS/propaganda
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Old 05-05-2017, 09:38 PM #11
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Default Re: Very low laser beam divergence

Quote:
Originally Posted by Radim View Post
That's a nice video IMO, not because of the experiment, but because of laser they used and showed it how the dot looks in various far distances during a day.
That's the reason why I posted this video.
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Old 05-06-2017, 12:29 AM #12
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Default Re: Very low laser beam divergence

I was struck by the fact that by 3 miles out they could no longer see the dot/spot/light of any kind. A three watt 532nm laser with a good BE should have been visible still at that distance.
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Old 05-06-2017, 03:04 AM #13
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Default Re: Very low laser beam divergence

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Originally Posted by paul1598419 View Post
I was struck by the fact that by 3 miles out they could no longer see the dot/spot/light of any kind. A three watt 532nm laser with a good BE should have been visible still at that distance.
That could be do to scattering and or refraction of the beam do to different air densities close to the water surface.
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Old 05-06-2017, 03:15 AM #14
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Default Re: Very low laser beam divergence

That is possible, but I tend to think it is because this whole thing was a sloppy attempt at science.
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445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM
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