This research illustrates the design of a parallel plate reflector operating in the visible and near infrared fields, with a reflection and/or transmission coefficients equal to 50%, and robust to the polarization of the used light and its extinction
ratio (PER), in each of the two directions of polarization (perpendicular S and parallel P). Also there is no need for accurate adjustment of the plate so that the angle of incidence is exactly equal to 45.
The research has its various applications in optical measurements laboratories, laser technology laboratories, optical communication laboratories, and photography.
One of the most important applications of this plate is ophthalmology devices, which can be used as glasses for people with impaired vision, light measurements in laser laboratories and optical measurements.
ABSTRACT
This paper presents the measurement of the laser Threshold damage of an optical surface at different roughness coefficients. The study procedure is achieved
through the manufacturing of two types of parallel-sided borosilicate plate (Glass
Bk7, and SF13).
The Laser used is ND: YAG pulsed laser and the longitudinal mode TEM00 laser pulses with pulse width τ =30ns and wave length λ=1.064μm, the laser
beam is focused using F=30 mm lens. The concentrated laser beam is guided by a converging lens towards the optical surface of the parallel surface plate.
Finally, we obtained a graph of roughness coefficient is drawn in relation the optical Threshold Damage of the optical surface, Before and after processing
the optical surface. We were able to raise the threshold by about 15% after conducting thermal treatment of the optical surface.
In this research work, the performance of the measurement system (TDLAS) has been improved, it was connected to the computer for acquisition and processing data using the programming language MatLab. The internal surface of the cavity was coated by p
araffin wax, adsorption is significantly lowered.
This system has been employed to measure the concentration of ammonia in exhaled breath for 20 healthy volunteers in two cases (fasting and non-fasting), and 36 volunteers with chronic renal disease (before hemodialysis).
Corner cubes are one of the most important optical tools used in new optical devices and optical LIDAR. This paper compares
two different designs of the hollow and solid tetrahedral corner cubes and determines the relation between the Retroreflectio
n
index and the surface quality N and the surface flatness N and its effect on the focal length of the hollow and solid corner
cube.
The main objective of the study is to select the best technique for lithotripsy of distal
ureteral stones .This study included 082 patients of distal ureteral stone at Al-Assad
University Hospital and Tishreen University Hospital in Latakia between
2016 and 2017.
64 patients who underwent ureteroscopic holmium laser lithotripsy and 216 patient who
underwent ESWL.The ages ranged from 19-72Years, The median age was approximately
37 year.
the success rate of distal ureteral lithotripsy using uretroscope-laser was 97% (100%
with stones> 1 cm, and 95% with stones< 1 cm) while it was 72% with the extracorporeal
lithotripsy(84% with stones > 1 cm, and 36% with stones < 1 cm).
The best results in treating the distal uretral stones were achieved by the use of
ureteroscope and laser lithotripsy, regardless of the stone size. While the extracorporeal
lithotripsy the best results was only with stones< 1 cm.
This paper discuss the Laser induced breakdown
spectroscopy (LIBS) by using Nd:YAG which is a high energy
pulsed Laser . The laser radiation is focused on solid targets which
are samples of red Copper (99.5%). Most important Plasma
parameters which are electron temperature and density was
measured.
This study aimed to evaluate the extent of the
microleakage in the cavities which prepared with Er:YAG (erbium:
yttrium aluminum garnet) laser or diamond burs and restored by
using of different types of resin materials.
The work includes the development of a program in an advanced – programming
language. to solve two none linear related partial differential equation that form a
mathematical model that describes the dynamic status of laser ,so that we can study the
properties of radiation density through this type the related program ,as well as the
population inversion inside the homogeneous medium of laser . We have studied the
strength f the out put power as well as the population inversion in the case of pulse –
working of the solid state laser Nd:YAG and the population inversion change as a function
of the diameter and length of the effective medium of laser .
We grooved photovoltaic cell surface, to extend front grid
electrical contact, using laser to improve its performance. By
reduce line width leads to reduced shading loss. Mor light can
penetrate into the cell instead of being reflected from the me
tallic
gridlines.
The aim of this study is to evaluate the microleakage
resultant from; Silorane resin composite restorations in primary
teeth Prepared Using Burs And Er:YAG Laser with or without
using additional etching.
