Iraqi Laser Society Journal

The z-scan is an important optical technology that is used to diagnose the optical behavior of different materials and optical elements and to verify their parameters by defining their linear and non-linear optical properties, this technique is based on the principle of the interaction of the laser beam with the material within tunable ranges of power, During the research, this technique was employed in a research and experimental manner to determine its capabilities and record its ability to be a database that can be adopted in future research in this field. The solid-state laser type (Nd: YAG) continuous wave (CW) 100mW @ 1064 nm was calculated intensity of the beam, depending on the approved engineering distribution was calculated intensity of the laser beam were observed harmony wonderful ability within the ranges of the optical axis can be employed in the experiments to determine visual qualities of linear and nonlinear materials.

Light induced fluorescence technique is used for the investigation of selected soil samples from local sites to account for a suspected pollutants that may be included containing uranium amounts. Different excitation sources are used including xenon lamps(7w,50Hz) and high repetition xenon lamp(450w,40kHz), are used to excite both investigated soil sample uncontaminated and induced contaminated with uranium standard samples and uranium standards with different concentration and the excitation wave length used are (280,295,337,340,370,450 nm). Fluorescence measurement are carried on for the investigated samples for the steady state. The excitation with the 295 nm wavelength gave best emission results.

Low lower laser therapy is a form of alternative medicine where laser beams or light-emitting diodes (LED) are used on different areas of the body. Unlike the behavior of high-energy lasers that cut and destroy tissues, a low-level laser is used to relieve pain or stimulate and enhance function. Cell.In this study, a review of the concept of cold lasers and the different medical applications of the cold laser, their advantages and disadvantages, is studied, and the optimum conditions for work and the suitability of the cold laser for appropriate application are determined.

A microbend-based fiber optic sensor was designed and constructed to continuously track the level of liquids in the petroleum and chemical industries. In order to detect light, the device includes a microbend modulator (pair of teeth plates), a sensor and reference fiber, a glass tube containing water, a massage gage, a laser diode and an energy meter.The intensity of the liquid and the pressure are calculated in order to eliminate the fluctuation of the light source relative to the reference fabric. The sensor is based on the principle of liquid pressure. Liquid pressure causes the fiber to be micro-bend, The liquid level is indicated when comparing the output power of the bending fiber caused by liquid pressure with that of the reference power. The main advantage of this device is the low cost of using toxic or hazardous liquids. The results show that this sensor is suitable for liquid level measurement applications, particularly in areas where electrical insulation and electromagnetic interference (EMI) resistance are strictly required. This sensor was checked for oil, methanol and distal water

This study presents a concept of forming high electron density cloud in the Vicinity of radioactive materials. The concept based on the reality that radioactive materials emit gamma rays, which ionize the surrounding air. The electrons generated due to ionization rapidly attach to oxygen molecules forming O2- ions. Density of O2- in the vicinity of radioactive material can be several orders of magnitude greater than background levels. Increased population of O2 -extends several meters around the radioactive material. Electrons are easily photo-detached from O2- ions by a radiation of THz pulse signal. In the presence of THz pulse radiation, the photo-detached electrons initiate avalanche ionization which results in a rapid increase in electron density. As the electron density increases a frequency modulation on a probe beam will be induced, this becomes a direct spectral signature for the presence of radioactive material. Three radioactive sources are introduced in this study, 60Co, 137Cs and 22Na. These three radioactive sources of different amount 1.0 mg and 20.0 mg. The calculations are done up to three meters away from the sources. THz radiation could be high intensity laser source.