کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10428750 | 909419 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The M2 factor of nonparaxial Hermite-Gaussian beams and related problems
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
On the basis of the second-order moment of the power density and in the use of the series expansion, the expressions for the beam width, far-field divergence angle and M2 factor of nonparaxial Hermite-Gaussian (H-G) beams are derived and expressed in a sum of the series of the Gamma function. The theoretical results are illustrated with numerical examples. The M2 factor of nonparaxial H-G beams depends not only on the beam order m, but also on the waist-width to wavelength ratio w0/λ. The far-field divergence angles of nonparaxial H-G beams with even and odd orders approach their upper limits θmax=63.435â and 73.898â, respectively, which results in M2<1 as w0/λâ0. For the special case of m=0 our results reduce to those of nonparaxial Gaussian beams. Some problems related to the characterization of the nonparaxial beam quality are also discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - International Journal for Light and Electron Optics - Volume 116, Issue 5, 16 June 2005, Pages 232-236
Journal: Optik - International Journal for Light and Electron Optics - Volume 116, Issue 5, 16 June 2005, Pages 232-236
نویسندگان
Xiaoping Kang, Baida Lü,