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trendal
J♠



Registered: 04/17/01
Posts: 20,815
Loc: Ontario, Canada
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Lasers in the radio part of the spectrum...
#8165614 - 03/19/08 07:35 AM (16 years, 2 months ago) |
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Do they exist?
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Once, men turned their thinking over to machines in the hope that this would set them free. But that only permitted other men with machines to enslave them.
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Seuss
Error: divide byzero



Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 3 months, 8 days
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Re: Lasers in the radio part of the spectrum... [Re: trendal]
#8165641 - 03/19/08 08:03 AM (16 years, 2 months ago) |
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Masers exist... (Microwave range)
-------------------- Just another spore in the wind.
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trendal
J♠



Registered: 04/17/01
Posts: 20,815
Loc: Ontario, Canada
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Re: Lasers in the radio part of the spectrum... [Re: Seuss]
#8165647 - 03/19/08 08:09 AM (16 years, 2 months ago) |
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Yeah...but that's not far enough
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Once, men turned their thinking over to machines in the hope that this would set them free. But that only permitted other men with machines to enslave them.
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Asante
Omnicyclion prophet


Registered: 02/06/02
Posts: 87,645
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Re: Lasers in the radio part of the spectrum... [Re: trendal]
#8168581 - 03/19/08 07:06 PM (16 years, 2 months ago) |
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Do you want to send radio signals to alien worlds?
-------------------- Omnicyclion.org higher knowledge starts here
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trendal
J♠



Registered: 04/17/01
Posts: 20,815
Loc: Ontario, Canada
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Re: Lasers in the radio part of the spectrum... [Re: Asante]
#8171203 - 03/20/08 10:33 AM (16 years, 2 months ago) |
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No, I'm more interested in terrestrial applications
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Once, men turned their thinking over to machines in the hope that this would set them free. But that only permitted other men with machines to enslave them.
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Asante
Omnicyclion prophet


Registered: 02/06/02
Posts: 87,645
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Re: Lasers in the radio part of the spectrum... [Re: trendal]
#8174299 - 03/20/08 11:28 PM (16 years, 2 months ago) |
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Non-scatter data transmission?
-------------------- Omnicyclion.org higher knowledge starts here
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stefan
work in progress


Registered: 04/11/01
Posts: 8,932
Loc: The Netherlands
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Re: Lasers in the radio part of the spectrum... [Re: trendal]
#8175264 - 03/21/08 09:45 AM (16 years, 2 months ago) |
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you would have to aim it VERY carefully to a reciever
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koppie
astral projectile


Registered: 07/23/04
Posts: 2,653
Loc: cloud hidden
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Re: Lasers in the radio part of the spectrum... [Re: trendal]
#8182686 - 03/23/08 07:41 AM (16 years, 1 month ago) |
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I believe what you are referring to is a radio transmitter.
A laser or maser traditionally is an amplifying medium placed in a resonant cavity. Feedback from the cavity (a pair of mirrors in the case of a laser or a tuned waveguide in the case of a maser) turns the amplifier into an oscillator.
In a radio transmitter the amplifying medium is either a transistor or a vacuum tube and the feedback is provided by a tuned coil/capacitor or a Quartz crystal.
High power transmitters usually have amplifying stages following the oscillator. This scheme is mirrored in the design of high powered lasers (as used in fusion research) where one traditional laser is followed by several stages of laser medium without mirrors, which amplify the beam from the first laser.
If you want a low divergence beam you need to make it a couple of thousand wavelengths wide to compensate for diffraction. In the case of a laser this means a diameter of a few mm, in the case of radio waves you need something akin to the Arecibo dish to get a nice parallel beam of about a mile across. Not very practical on earth.
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