Pressure, gas ratio and operation voltage optimization of a helium-neon laser

Bilgili, Hulusi Birol
Aim of this thesis is to investigate the optimum working parameters of a helium-neon laser. Partial pressure ratios, total pressures of the gases and voltage-current characteristics were studied. The analysis of the results includes the minor factors (impurity, volume, etc.) and their effects to main parameters (laser power, voltage, current). Tables, which were formed by measured optical parameters as wavelength and power, converted to graphs and from these graphs optimal working conditions for the laser are obtained.


Numerical analysis of radio frequency inductively coupled ion thruster and computation of its performance parameters
Bozkurt, Erdal; Alemdaroğlu, Nafiz.; Department of Aerospace Engineering (2019)
The main goal of this thesis is geometric and parametric analysis of a simulated cylin-drical two-gridded Radio Frequency Inductively Coupled (RF-ICP) ion thruster. Inaddition, instrumental performance of this thruster and the effects of a fixed shapeof the electrodes on ion trajectories are investigated. The simulations of the plasmaand the ion optics are performed by using COMSOL Multiphysics software. The firststep is checking the reliability of the software. Radial and axial simulation parametricresults...
Dynamic ion behavior in plasma source ion implantation
Bozkurt, Bilge; Bilikmen, Kadri Sinan; Department of Physics (2006)
The aim of this work is to analytically treat the dynamic ion behavior during the evolution of the ion matrix sheath, considering the industrial application plasma source ion implantation for both planar and cylindrical targets, and then to de-velop a code that simulates this dynamic ion behavior numerically. If the sepa-ration between the electrodes in a discharge tube is small, upon the application of a large potential between the electrodes, an ion matrix sheath is formed, which fills the whole inter-ele...
Theoretical investigation of laser produced Ni-like Sn plasma
Yurdanur, Elif; Bilikmen, Kadri Sinan; Department of Physics (2006)
In this thesis, theoretical investigation of nickel-like tin plasma is presented. X-ray production in a plasma medium produced by a laser beam is reviewed. Applications mostly, lithography are discussed. Two different schemes for x-ray lasing, namely, quasi-steady state and transient collisional excitation are explained and compared. The computer codes that are used for plasma, especially for laser produced plasma and x-ray laser including hydrodynamic codes, ray-trace codes and collisional radiative codes ...
High gradient plasma waves to accelerate charged particles
Yedierler, Burak; Bilikmen, Kadri Sinan; Department of Physics (2002)
In this thesis one of the most promising plasma based particle acceleration methods, the Laser Wakefield Acceleration (LWFA) mechanism is discussed in detail. Starting from the standard LWFA method, the wakefield generation in plasmas and the energy gain of electrons are formulated. The wakefield generation by a multi passage laser beam in a plasma model based on the resonant LWFA is proposed. The growth of the wakefield amplitude is demonstrated and the corresponding energy gain of electrons is calculated....
Development of compact terahertz time-domain terahertz spectrometer using electro-optic detection method
Metbulut, Mukaddes Meliz; Altan, Hakan; Department of Physics (2009)
The goal of this thesis is to describe development of compact terahertz time-domain spectrometer driven by a mode-locked Ti:Sapphire laser. The terahertz radiation was generated by photoconductive antenna method and detected by electro-optic detection method. In this thesis, several terahertz generation and detection method, working principle of terahertz time-domain spectroscopy and its applications are discussed. We mainly focused on working principle of terahertz time-domain spectroscopy and characteriza...
Citation Formats
H. B. Bilgili, “Pressure, gas ratio and operation voltage optimization of a helium-neon laser,” M.S. - Master of Science, Middle East Technical University, 2005.