International Journal of Optics and Photonics

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Showing 2 results for Haddad

Intensity-Dependent Thermally Induced Nonlinear Optical Response of Graphene Oxide Derivative in Hydraulic Oil

Mr. Moein Golestanifar, Dr. Mohammad Ali Haddad, Mr. Amir Namiq Hassan, Dr. Fatemeh Ostovari,
Volume 17, Issue 2 (Summer-Fall 2023)

Abstract

The spatial self-phase modulation (SSPM) method was used to study the nonlinear optical responses of hydraulic oil containing dispersed nanosheets of reduced graphene oxide (rGO), hydroxylated rGO (rGO-OH), and carboxylated rGO (rGO-COOH). The intensity-dependent number of observed symmetric diffraction rings was analyzed to estimate the samples' thermally induced nonlinear refractive indexes and lead to estimated thermo-optical coefficients. Based on the observed symmetric diffraction rings, the nonlinear refraction coefficient and thermo-optical coefficient of samples were estimated to be in the order of magnitude of 10^-6 cm²/W and 10^-2 K^-1, respectively. The results indicated that the presence of rGO derivatives significantly enhanced the optical nonlinearity of hydraulic oil.

Characterization of Urinary Calculi Using Laser-Induced Breakdown Spectroscopy and X-ray Diffraction: A Regional Study in Iran

Rezvan Babamir, Mohammad Ali Haddad, Seyed Hassan Tavassoli, Mohamad Reza Samadzadeh Yazdi, Serajoddin Vahidi,
Volume 18, Issue 1 (10-2024)

Abstract

Detailed compositional analysis of kidney stones is crucial for effective treatment and prevention; however, region-specific data are often limited. This study aimed to characterize the composition of urinary stones in Yazd Province, Iran, where such information is required. Urinary stones from 40 patients in Yazd were analyzed using Laser-Induced Breakdown Spectroscopy (LIBS) for elemental identification and X-ray Diffraction (XRD) for crystalline structure determination. LIBS was applied to both macroscopically uniform and heterogeneous stones to assess the intra-stone variability in elemental composition. LIBS revealed the consistent prominence of carbon, calcium, and nitrogen in uniform stones. Notably, heterogeneous stones exhibited significant intra-stone variations in elemental composition. XRD identified key crystalline components, including calcium oxalate (whewellite and raphide), calcium carbonate (calcite), and uric acid (uracite). These findings offer region-specific understanding into the types and characteristics of urinary stones prevalent in Yazd, Iran, emphasizing the importance of considering intra-stone heterogeneity. The integration of LIBS and XRD offers a comprehensive approach to stone characterization. Further research correlating these findings with patient-specific and environmental factors in Yazd is warranted to improve our understanding and treatment strategies.

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