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Rashidian Vaziri M R. Obtaining the effective focal length of the shaped lens in nonlinear media in their interaction with laser beams. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :637-640
URL: http://opsi.ir/article-1-639-en.html
URL: http://opsi.ir/article-1-639-en.html
Abstract: (3898 Views)
In this paper, the effective focal length of the formed lens in nonlinear media as a result of their interaction with the laser beams is obtained. To this end, it is assumed that the nonlinear medium induces a nonlinear phase in the impinging wave. Using the aberration-free theory and the Taylor series expansion of the nonlinear phase shift, the lens focal length is obtained. It is shown that the focal length must contain a correction factor to precisely consider the role higher order omitted terms in the Taylor expansion. Previously performed experiments showed that the mentioned correction factor may take on values between 3.77 and 6.4. If this correction factor be ignored in determination of the value of the nonlinear refractive index, in the experiments that are mostly used in this case, the determined values may contain relative errors as large as 73.5- 84.4%.
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