sun distroying lasers

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Given that many LEDs are photsensitive, and sometimes used for dual purposes , can we be 100% certain that exposure of some laser diodes to direct sunlight may not cause some degradation?
SandyK

LED doubles as emitter and detector | EDN

Yes, some knowledge of physics helps, the power density inside the laser diode is orders of magntude more than solar flux. The crossection of a typical laser diode is tiny and solar flux is around 1000W per square meter at best.
 
Yeah but they all would have to be on one side of the earth at the time. This then begs a question, would the earth then topple over because it's unbalanced? Think about it.:D

I've always wondered... if all the land masses combined to form a supercontinent, wouldn't the resulting shift in center of gravity cause the sea to flood and cover the supercontinent while revealing other new land masses?
 
A famous musician supposedly announced that he will release his next music album on vinyl because it can reproduce the fine texture of the music better than digital can. You can be sure the disc will cost a bomb ! Wonder if that means there will be no CD version ?
In which case lets hope they modulate/press the LP correctly! I have heard absolutly terrible LPs straight out of the new packet. Some of the best in my opinion were EMI, Atlantic and sometimes the old DECCA! :D
 
Not much as more than half would land in water. But say you got Australia full of people, (no bias here!) and made them all jump at the same time, and then again just at the right time about half an hour later and so on.

You would very easily as Nikola Tesla postulated, destroy the earth from resonance. He said it would split like an apple! no wonder they thought he was a mad scientist:D
teslaxc9.jpg
 
It is quite possible to blow a laser diode, with some effort, by causing a reflexion on the integrated monitoring photodiode ( by saturating it).
How it may work? For constant power lasers a photodiode generates a current proportional with the optical power. This is converted to a voltage which is compared with a reference that sets the CW power. Typically this is done at max 80% of the rated diode power to allow for aging and get good service life... ..and to protect the diode against accidental overshoots in the error amp.

With ill conceived electronics (no poles to control rise time, no fast over-current limiting and with the power adjusted to 100% eventually) it only takes a few usec after the occurrence of a reflexion to get a "supernova".

Generally it happens when adjusting the focus, the beam itself gets reflected on impurities on the back side of the lens or on other "bad" optical surfaces.
As for the sun... the only thing playing in sun's favor is its "wideband" but other than that all you need is a shutter...Wait, it may work afterall...:rolleyes::confused:
 
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