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self-defocusing |
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self-defocusing [¦self dē¦fō·kə·siŋ] (optics) The action of a medium whose index of refraction decreases with increasing optical intensity on a laser beam that is more intense in the center than at the edges, whereby the profile of the refractive index corresponds to that of a negative lens, causing the beam to defocus. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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