Modeling the Discharge Loading of Radio Frequency Excited CO2 Slab Lasers PDF Download
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Author: Saad Ahmad
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Abstract: RF excited CO2 lasers are widely used in industry. They provide relatively high power discharge levels while maintaining compactness, simplicity, and durability with respect to other competing laser technologies. To attain high power levels in the range of 5-10 KW, lasers with large electrode areas have to be designed. Unfortunately, due to the large electrode length requirements, transmission line effects make the discharge loading nonlinear, adversely affecting the efficiency of the CO2 laser. A standard approach to linearize the discharge loading is to introduce shunt inductors across the length of the electrodes in an effort to counter the capacitive nature of the discharge behavior. This thesis investigates and improves the theoretical models found in the literature in an effort to predict the discharge non-uniformity and allow for multiple shunt inductors installation. Specifically, we discuss the coupling of a CO2 laser discharge model with an electrical circuit solving scheme and how it can be characterized as one dimensional (1-D) and two dimensional (2-D) systems. The 1-D system is modeled using transmission line (TL) theory, where as the 2-D system is modeled using a finite difference time domain (FDTD) scheme. All our models were implemented in standard MATLAB code and the results are compared with those found in the literature with the goal to analyze and ascertain model limitations.
Author: Saad Ahmad
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Book Description
Abstract: RF excited CO2 lasers are widely used in industry. They provide relatively high power discharge levels while maintaining compactness, simplicity, and durability with respect to other competing laser technologies. To attain high power levels in the range of 5-10 KW, lasers with large electrode areas have to be designed. Unfortunately, due to the large electrode length requirements, transmission line effects make the discharge loading nonlinear, adversely affecting the efficiency of the CO2 laser. A standard approach to linearize the discharge loading is to introduce shunt inductors across the length of the electrodes in an effort to counter the capacitive nature of the discharge behavior. This thesis investigates and improves the theoretical models found in the literature in an effort to predict the discharge non-uniformity and allow for multiple shunt inductors installation. Specifically, we discuss the coupling of a CO2 laser discharge model with an electrical circuit solving scheme and how it can be characterized as one dimensional (1-D) and two dimensional (2-D) systems. The 1-D system is modeled using transmission line (TL) theory, where as the 2-D system is modeled using a finite difference time domain (FDTD) scheme. All our models were implemented in standard MATLAB code and the results are compared with those found in the literature with the goal to analyze and ascertain model limitations.
Author: Ssardar Mohammad Ayub Durrani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: S. M. A. Durrani
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722968014
Category :
Languages : en
Pages : 162
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Book Description
The topics covered include the following: (1) CO2 laser kinetics modeling; (2) gas lifetimes in pulsed CO2 lasers; (3) frequency chirp and laser pulse spectral analysis; (4) LAWS A' Design Study; and (5) discharge circuit components for LAWS. The appendices include LAWS Memos, computer modeling of pulsed CO2 lasers for lidar applications, discharge circuit considerations for pulsed CO2 lidars, and presentation made at the Code RC Review. Johnson, Barry Unspecified Center ATMOSPHERIC SOUNDING; CARBON DIOXIDE LASERS; KINETICS; LASER APPLICATIONS; MATHEMATICAL MODELS; OPTICAL RADAR; PULSED LASERS; RADAR MEASUREMENT; SPECTRUM ANALYSIS; WIND MEASUREMENT; CHIRP; CIRCUITS; COMPUTERIZED SIMULATION...
Author: W. W. Duley
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 458
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Book Description
CO2 Lasers: Effects and Applications examines and summarizes the important applications of the device in different areas of study like physics, chemistry, and engineering. -- Google books
Author: Jonah Jacob
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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A pulsed CO2 laser system has been designed, fabricated, and successfully tested. Laser pulses have been generated with measured output energy of 600 mJ, pulse length 40 microsecond, and conversion efficiency of 14% in a 3:2:1 (HeN2:CO2) gas mixture. The laser operates at a total gas pressure between 5 and 40 Torr, and utilizes the COLD-I all-solid-state CO2 laser driver developed by SRL. Typical current, voltage, and laser output traces are presented and compared to numerically simulated curves, showing reasonable agreement. The theoretical model of CO2 laser discharges has been extended and utilized to analyze the steady state solutions and stability criteria for three regimes of operation: the stiff voltage case, the stiff current case, and the finite external impedance case. Numerical solutions are presented for the temporal evolution of the electron (plasma) density, the metastable density, and the electric field under various conditions. The theory of RF discharge stabilization has been extended to two spatial dimensions, and numerical results are presented for the stiff current and the stiff voltage cases. In a repetitively pulse CO2 laser, the lasing gas must be cooled between pulses to preserve efficiency. Conduction cooling has been examined by SRL as an advanced alternative to the traditional flow loop approach. This concept minimizes the weight of the laser head. A thermal analysis of a pulsed CO2 laser head with conduction cooling is presented, along with a discussion of beam quality effects due to acoustic and thermal processes. (jhd).
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1058
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Author: Stian Loevold
Publisher:
ISBN:
Category :
Languages : en
Pages : 101
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The concept of pumping a CO2 laser with a radiofrequency discharge at multiatmospheric pressures in order to obtain continuous frequency tuning has been investigated both theoretically and experimentally. Experimentally 40.68 MHz rf-excitation of discharges between parallel plate electrodes with up to 7-8 kW peak rf-power has been investigated. Emphasis has been laid on how to attain a stable glow-discharge with sufficiently long duration before arcing for integration of enough rf-power in the discharge to reach threshold for laser oscillation. A 10 atm rf-excited CO2 waveguide laser has been developed. With no dispersive elements in the laser resonator and with a 2% output coupler, input rf-power threshold for laser oscillation was 2 kW at 10 atm. Peak output power was 1.5 kW for 7-8 kW input rf-power. The output pulse has the form of a 300 ns duration gain-switched pulse followed by a tail at lower power. An efficiency (input rf-energy/laser output-energy) of 2% has been measured for the gain-switched pulse. The laser has been operated with pulse repetition rates in excess of 1 kHz, limited primarily by the available gas-flow capacity. Continuous frequency tuning between the R(12) and R(14) lines in the 10.4-micrometer band has been demonstrated. (Author).
Author: Alan William Mitchell
Publisher:
ISBN:
Category : Carbon dioxide lasers
Languages : en
Pages : 206
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Author: Bruce Allan McArthur
Publisher:
ISBN:
Category : Carbon dioxide lasers
Languages : en
Pages : 188
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