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By B.T. Arnold

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Extra info for Babylonian Letters from the Kuyunjik Collection: Seventh Century Uruk in Light of New Epistolary Evidence

Sample text

This point is achieved when the intensity is about one-tenth of its initial value. 04 s ' SnopCp [(dn/dT)v a 2 XL 1 / 2 2 ay/E' where E is the pulse energy. , aL

If the turbulence is very fast, an adaptive optics system would only see the time-averaged disturbance. Fortunately, the actual turbulence is driven by winds and local eddies, which can be tracked by electronic means. A beam will pass through a different part of the air every time the wind moves it one beam diameter, t « D/v (D is the beam diameter; v is the wind velocity). When a beam is much larger than the coherence length, the time of interest is the time it takes for the wind to transport the beam one coherence length r [408], w w When the wind velocity is high, the movement of eddies across beam edges becomes very fast.

4 E v e n t h o u g h it is difficult t o get a large mirror jittering fast, it is generally treated the s a m e by a n a d a p t i v e optics s y s t e m . 3. NON-ATMOSPHERIC SOURCES 45 The aberrations that occur at mismatched edges have spatial frequency content that is very high. These almost-infinite spatial frequencies must be treated separately. The correction over the edges (which is usually a very small portion of the area of the aperture) can be simply disregarded, or the light that impinges on these edges can be masked out.

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Babylonian Letters from the Kuyunjik Collection: Seventh Century Uruk in Light of New Epistolary Evidence by B.T. Arnold


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