Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : laser

An Investigation of Germanium Properties Prepared by Laser Ablation in Liquid

Iman H. Hadi

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1467-1472

In this work, fabrication and characterization of germanium (Ge) NP is presented. The germanium particles were prepared by pulsed laser ablation in liquid technique (PLAL) at different laser fluenceusing Q-switched Nd:YAG laser at (1.06 µm) laser wavelength with pulsewidth 10 ns .Atomic Force Microscopy(AFM) and Energy Dispersive Analysis of X-rays (EDAX) are utilized here to study the surface and sizes of Ge nanoparticles and the evidences for ablation of materials respectively and the spectrophotometer have been used to characterize the optical properties of the prepared nanoparticles.

Second Order Dispersion In The Interferometer's Optical Elements For Quantum Cryptography (QC) System

Adawiya J. Haider; Ali K. Abdul-Fattah; Ahlam L. huraiji; Duha S. Ahmed

Engineering and Technology Journal, 2009, Volume 27, Issue 4, Pages 654-662

In this study, we have studied the entangled photon source and how the coincident
count rate and visibility could be affected by the optical elements of the system setup. The
profile of the interference dip of the optical elements for Quantum Cryptography (QC)
system is modified by the increase of the second order dispersion parameter (Dp) and lead to
increase of visibility. Non zero chirp parameter (ai) of the pump beam can provide a higher
central peak but on the other hand it reduces the visibility, the peak remains, while the
dispersion in an optical element through which down converted photon propagate leads to
asymmetry in the interference pattern dip , the dip is particularly stretched with larger value
of birefringent material length (20-30)mm. The highest visibility at birefringent material
dispersion (d) equals to zero, and the dip was broader at larger value of (d).