کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7925787 | 1512510 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffraction of a Gaussian laser beam by a straight edge leading to the formation of optical vortices and elliptical diffraction fringes
ترجمه فارسی عنوان
تفکیک یک پرتو لیزر گاوسی توسط یک لبه مستطیلی که منجر به تشکیل گردابی های نوری و حاشیه های پراش بیضی می شود
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کلمات کلیدی
انکسار، گرداب نوری، پرتو گاوسی، دخالت، انسجام فضایی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
The diffraction of a Gaussian laser beam by a straight edge has been studied theoretically and experimentally for many years. In this paper, we have experimentally observed for the first time the formation of the cusped caustic (for the Fresnel number Fâ100) in the shadow region of the straight edge, with the cusp placed near the center of the circular laser beamλ=0.65μm overlapped with the elliptical diffraction fringes. These fringes are originated at the region near the cusp of the caustic where light intensity is zero and the wave phase is singular (the optical vortex). We interpret observed diffraction fringes as a result of interference between the helical wave created by the optical vortex and cylindrical wave diffracted at the straight edge. We have theoretically revealed that the number of high contrast diffraction fringes observable in a shadow region is determined by the square of the diffracted angles in the range of spatial frequencies of the scattered light field in excellent agreement with experiments. The extra phase singularities with opposite charges are also observed along the shadow boundary as the fork-like diffraction fringes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 413, 15 April 2018, Pages 261-268
Journal: Optics Communications - Volume 413, 15 April 2018, Pages 261-268
نویسندگان
Iosif Zeylikovich, Aleksandr Nikitin,