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Yes, the amount of radiation (i.e. power) would decrease $N^4$ times, since the whole geometry of the system does not change, only the power emitted by the sun. But the temperature of the earth would decrease only $N$ times, since the ratio of the temperatures remains equal - again because of the unchanged geometry. The earth radiates a power proportional ...


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Background The specific intensity or brightness, $I_{\nu}$, is defined as: $$ I_{\nu} = \frac{ dE }{ dA \ dt \ d\Omega \ d\nu } \tag{1} $$ where $\nu$ is the frequency, $dE$ the differential energy, $dA$ the differential area, $dt$ the differential time, $d\Omega$ the differential solid angle, and $d\nu$ the differential frequency. We can define a net flux ...


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Now perfect balance between the centrifugal force of orbital rotation and sun's gravity is impossible so the earth's orbit should either be slowly decaying inwards or expanding outwards due to difference in magnitude of those opposing forces. This assumption is incorrect. We could make the same argument about a weight suspended from a spring. ...


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In principle there is nothing wrong with your idea. But I think it is not viable by DIY, at least not with the results I guess you'd be expecting, with such a small understanding of the subject (read: Wikipedia is definitely not enough, and if you were to do things seriously the Sun would be the last source you'd be thinking of). First of all, any lasing ...


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An inverted laser medium can be used to amplify light in general so in principle this is perfectly possible. The output would however inherit the properties of the sun light and you would not get a laser like type of radiation. What you also have to keep in mind is the limited gain bandwidth of typical laser materials. Ti:sapphire is an example of a very ...


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The part of your question about the non-visible light gives quite surprising (to me at least) results! : Compare the power from the sun with the cosmic microwave background ("CMB"), taking both as blackbody radiators: The temperatures are 2.725 and 5778 K respectively (wikipedia :)) The solid angle of the CMB is obviously $4\pi$. The diameter of the sun ...


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Sun pumped laser The two most studied lasing media for solar-pumped lasers have been iodine,1 with a laser wavelength of 1.31 micrometers, and NdCrYAG, which lases at 1.06 micrometers wavelength... The largest solar-pumped laser is currently being operated by a research facility in Uzbekistan. It is a 1 MW solar input power NdYAG type laser, ...



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