What to call this thread?

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Shiftless2 said:
Putting things in perspective #1,384
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If marriage is so great, why isn't god married? comedian David Brenner
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A N D !

There's an "R" !

- glass half full -
For most of human history food insecurity was an unrelenting concern.

How sublimely fortunate we are that the busybodies of the world have chosen #1,384 to make issue of, rather than:
- global warming
- child hunger
- Trump
- RFKj
- ...
 
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A rainbow laser stretched across the night sky over St. Petersburg, Florida -- visible from 60 miles away and impossible to ignore. The installation, called "Global Rainbow," which ran in late February for three nights, was a direct response to Governor Ron DeSantis's decision to erase more than 400 Pride crosswalks, street murals, and public art installations across the state.

"I am so proud to be able to do this where that rainbow crosswalk was taken away," said laser artist Yvette Mattern, who designed the display and received FAA clearance to project it across 50 blocks of Central Avenue toward the beaches. "Throughout my work around the world, I've learned that light carries meaning far beyond aesthetics. In moments when communities are pushed into silence, light becomes a form of presence and protest."

For Winter Pride St. Pete Executive Director Rob Hall, the display carried deeply personal weight. When Hall came out as an adult, he moved to St. Petersburg because he knew the city would be safe and accepting. The rainbow crosswalk in the Grand Central District was one of the first things he saw. "When I got to St. Pete, seeing that crosswalk, it was life-changing," he told Fox 13. Then last summer, the state painted over it -- along with a Black History Matters mural, student art on a bike lane, and even a "Back the Blue" mural outside a Tampa police station.

"When it was removed, it had a significant impact on my heart," Hall reflected. But he was resolute about what the laser display represented: "This is about more than one crosswalk. It's about the growing voices in Tallahassee and Washington that are actively trying to erase ....

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Shiftless2 said:
"A rainbow laser stretched across the night sky over St. Petersburg, Florida -- visible from 60 miles away and ..." #1,389
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This #1,390 comment is not an editorial comment on the merit of the socio-political rainbow. BUT !
Lasers are a continuing threat to U.S. aviation.

If the above quoted description is accurate, it presents a potential risk to human pilot aviation.

We can all take pride in championing uniform human rights.
But there's no shame in promoting that objective safely, without jeopardizing airliners.
 
sear said:
This #1,390 comment is not an editorial comment on the merit of the socio-political rainbow. BUT !
Lasers are a continuing threat to U.S. aviation.

If the above quoted description is accurate, it presents a potential risk to human pilot aviation.

We can all take pride in championing uniform human rights.
But there's no shame in promoting that objective safely, without jeopardizing airliners.
Click to expand...

To get the rainbow effect, one has to use a prism to separate the different frequencies, and that will render the laser safe for aircraft.
It is only when a laser remains focused with all its energy in a tiny dot that it is dangerous.

In the image, the laser is brightest in the upper left, and towards the lower right, it gets continually dimmer.
The means it is spreading out and has less danger over distance.
The danger from a normal laser comes from the fact it does not normally spread out at all, but remains a pinpoint of high energy.
 
Rigby5 said:
"To get the rainbow effect, one has to use a prism" R5 #1,391
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That's one way.
It's not the only way.
The more obvious way, an array of lasers each emitting its own frequency (color).
Design bears on this, but a prism tends to cause light emerging from it to diverge.
The illustration in #1,389 suggests the prism explanation is less likely.

What differentiates laser light from other light is laser light is coherent, the "waves" are synchronized.
Whether or not that changes after a laser beam passes through a prism ... ?

Rigby5 said:
" to separate the different frequencies, and that will render the laser safe for aircraft." R5
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Perhaps.
More likely, it may incrementally reduce some of the risk, but remains a risk.
 
sear said:
That's one way.
It's not the only way.
The more obvious way, an array of lasers each emitting its own frequency (color).
Design bears on this, but a prism tends to cause light emerging from it to diverge.
The illustration in #1,389 suggests the prism explanation is less likely.

What differentiates laser light from other light is laser light is coherent, the "waves" are synchronized.
Whether or not that changes after a laser beam passes through a prism ... ?


Perhaps.
More likely, it may incrementally reduce some of the risk, but remains a risk.
Click to expand...

The other factor in the image is that the rainbow laser appears to be only around 50' above the ground.
With the curvature of the earth, that eventually would become higher up, but I would hope it would also be more diffuse by then?
 
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