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![]() Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? phoenix |
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On 25 Apr 2005 03:14:12 -0700, "phoenix" wrote:
Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? phoenix No. I don't care what they could do on the Enterprise holodeck, it was all nonsense. But, maybe a ring of controllable and tiny black holes around the periphery of the objective opening could be used to "bend light" to achieve the results you're looking for. Kind of like how an electron microscope uses magnets instead of lenses to manipulate electrons. -Rich |
#3
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phoenix wrote:
Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? You have been watching too much Star Trek ![]() a "holographic" telescope could work. Light can't impact the path of light. There are ways that theoretically one could bend light without a physical lens; but they would involve manipulating the fabric of space time ![]() -- Bill |
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![]() William McHale wrote: phoenix wrote: Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? You have been watching too much Star Trek ![]() way a "holographic" telescope could work. Light can't impact the path of light. Hmm.. that's right... refraction of light depends on the difference between the speed of light of the mediums and the continued absorptions and emissions of the electrons from the photons. There are ways that theoretically one could bend light without a physical lens; but they would involve manipulating the fabric of space time ![]() Strong mass can bend light. Maybe putting heavy neutron star matter at the periphery of the tube?? But then it's no longer lightweight unless 4000 A.D. technology has developed antigravity so you can take it along with you as well as higgs field suppressor to prevent the heavy neutron star mass from being formed while being carried. If not possible. Maybe they will have their own version of AP Traveller with unbreakable unscratcheable glass with 0 wavefront error correction ![]() I heard that science can extend life indefinitely within 30 years with advances in genetic and nanotechnology. Would Roland Christen with his billions be recipient of this immortal technological upgrade to the human body? ![]() Ph -- Bill |
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phoenix:
...Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front... William McHale: You have been watching too much Star Trek ![]() a "holographic" telescope could work. Light can't impact the path of light. There are ways that theoretically one could bend light without a physical lens; but they would involve manipulating the fabric of space time ![]() A gravitational-lens telescope? "An entire amateur astronomy club disappeared from the known universe as one of its members brought a gravitational-lens telescope to a star party and club members who gathered around to have a look were sucked into the black hole that comprised the telescope's 'lens.' An onlooker who was sufficiently distant from the telescope to avoid the instrument's event horizon reported that she heard a chorus of voices shout 'Wow, what a view!' before the group 'simply disappeared.' The Department of Homeland Security is investigating whether the group had ties to Al-Qa'eda. Congressional Republicans are calling for a ban on amateur astronomy, but the effort is not expected to go anywhere, as an NRA spokesman says that the group opposes regulation of anything that could be mistaken for a rocket launcher." Davoud -- usenet *at* davidillig dawt com |
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LOL!
Shneor |
#7
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On 25 Apr 2005 03:14:12 -0700, "phoenix" wrote:
Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? If you mean some sort of projected lens, no, that doesn't seem possible (at the least, it would depend on technology and physics not yet envisioned). But certainly, holographic lenses are already used in a variety of optics, including devices with optical properties that can be changed electronically. Many laser pointers use holographic lenses, and holographic mirrors create the moving beam pattern in supermarket checkout scanners. At the chip scale, holographic optics are used to focus and steer light in complex ways. The only things standing in the way of a complete holographic telescope are engineering issues (not physics issues). But such a telescope would probably not offer many advantages over a conventional design, and might have certain serious optical problems, so I don't see anyone rushing to invest heavily in this type of instrument. _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
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You must be psychic! I suggested this idea a while ago.
I imagined a laser producing a large reflecting spherical surface in a cloud of reflective particles to act as a telescope primary. The responses were't very positive last time round either. grin Chris.B |
#9
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Yes, such a holographic lens is possible but it has extreme
limitations, notable it would work only at the wavelength at which the original hologram was made. I also suspect it would have odd aberations (other than chromatic). Such a lens would be diffractive rather than refractive which is what may be confusing some people about this possibility. Theoretically, a Fresnel zone plate could be substituted for a lens but such would be difficult to fabricate. DBO wrote: You must be psychic! I suggested this idea a while ago. I imagined a laser producing a large reflecting spherical surface in a cloud of reflective particles to act as a telescope primary. The responses were't very positive last time round either. grin Chris.B |
#10
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RichA wrote:
On 25 Apr 2005 03:14:12 -0700, "phoenix" wrote: Theoretically. Is it possible to construct a telescope using holographic lens such that you flick a switch and the lens just formed at the front. I like the idea of a very lightweight 0 wave error 6" refractor that I can carry at my back when hiking and just putting it on the equally lightweight image stabilizer mount when the sky has a great view. In 4000 A.D. Can the above occur.. theoretically?? phoenix No. I don't care what they could do on the Enterprise holodeck, it was all nonsense. But, maybe a ring of controllable and tiny black holes around the periphery of the objective opening could be used to "bend light" to achieve the results you're looking for. Kind of like how an electron microscope uses magnets instead of lenses to manipulate electrons. You could also put a single slightly larger black hole in the center of the objective opening. Of course this would not make refractor people happy since you would now have an obstructed system. One advantage though would be that you would not have to worry about people touching the lens... well actually you would because the amount of radiation released as they were ripped apart by tidal effects and sucked into the lens certainly would not be that healthy for anyone in the vicinity ![]() -- Bill |
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