نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه اراک
2 گروه فیزیک-دانشکده علوم پایه-دانشگاه لرستان-خرم آباد-ایران
کلیدواژهها
عنوان مقاله English
نویسندگان English
According to the most practical applications that use the Gaussian beam profiles from lasers in this study, Going further than applying the plane wave approximation, we consider a Gaussian coherent illumination on the two-dimensional separable structures to develop a more practical framework of the diffraction of a Gaussian beam by a radial phase grating with a binary profile that better reflects real-world experimental conditions. The results clearly demonstrate that this process leads to the formation of radial carpet beam patterns. These beams preserve their transverse structure during propagation, a property that makes their shape-invariance highly valuable for precise and controlled applications in science and technology. Furthermore, the influence of variations in the wavelength of the incident beam on the diffraction pattern of the radial phase grating with a binary is examined. The analysis reveals that the intensity distribution exhibits rotational symmetry, and that the number of lobes in the diffracted intensity and phase patterns is twice that of the corresponding radial phase grating with a binary. A comprehensive Fresnel diffraction model for a Gaussian beam interacting with radial phase gratings with a binary phase is presented, from which analytical expressions for the resulting complex optical field are derived.
کلیدواژهها English
