We service nearly all makes and models of argon, krypton, and mixed iongas lasers. Closedcycle gas dynamic laser design investigation 5. In recent years the use of diodepumped solidstate dpss lasers in oem applications has been growing rapidly. During the initial expansion stage, the plume acting as a supersonic piston on the ambient gas forms in the latter an external or primary shock wave which moves with respect to the centre. Pdf jet engine based mobile gas dynamic laser for water surface. We demonstrated the possibility of integrating the super jet turbine and a jet nozzle as a single binary system for the purpose of generation of powerful coherence radiation. Based on our work 8, the gasdynamic behaviour of the plume can be sketched as follows. On the basis of mean value theorem, one would expect that for every family of supersonic nozzle shapes shock free, wedged, logarithmic, and. The presence of a gas jet plays an important role in laser cutting.
We consider a turbofan engine tfe, where the turbine rotor blades of the low pressure turbine lpt are microlaval nozzles. The operation of a gas dynamic laser involves heating the gas, rapidly cooling that gas in a supersonic nozzle, flowing the gas through an optical cavity wherein stimulated emission lasing takes place, and exhausting the gas. Hassanein school of nuclear engineering and center for materials under extreme environment, purdue university, 400 central dr. Thus, the shape of a supersonic nozzle is an important factor in small signal gain of co 2 gasdynamic laser. An experimental 10kw cw gasdynamic laser is converted to a highfrequency pulseperiodic mode with pulses 0.
Gas dynamic laser gdl is laser based on differences in relaxation velocities of molecular vibrational states. The gas dynamics notes pdf gd notes pdf book starts with the topics covering concept of continuum and control volume, properties of atmosphere, stagnation enthalpy, variable area flow, adiabatic and isothermal flow calculation of pressure, pressure disturbances in compressible fuld, rayleigh pilot and frandtl pitot equation for normal. Heat treatment of largescale rolling machine rolls by. Each function has an mtype argument that lets you specify the inputs for the flow. Development of a large diameter diaphragmless shock tube. Guaranteed to meet or exceed original manufacturers specification. A gas dynamic laser gdl is a laser based on differences in relaxation velocities of molecular vibrational states. Experimental gas dynamic laser studies aiaa journal. A quantitative theory of an electronbeamexcited carbon monoxide gas dynamic laser. The mechanisms, peripherals, and priciples of the device are explained in plain language with just the right amount of mathematics, to excite the reader enough about this wonderful device, to want to get some handson, andor dive into somewhat more parametrically intense. A new concept for a high power co gas dynamic laser that promises both the high efficiency of an electrically pumped co gdl and the high power of a thermally pumped co gdl. All lgricos analyzers utilize a unique laser absorption technology called offaxis integrated cavity output spectroscopy oaicos. Carbon dioxide lasers, or co 2 lasers can emit hundreds of kilowatts at 9. The laser medium gas has such properties that an energetically lower vibrational state relaxes faster than a higher vibrational state, thus a population inversion is achieved in a particular time pure gas dynamic lasers usually use a combustion chamber, supersonic expansion nozzle.
Licensed to youtube by sme on behalf of mer musikk. Fundamentals, types, and operations n n e 0 e e 1 e 3 e 0 e e 1 2 fast decay fast decay fast decay pumping pumping lasing lasing a b figure 1. The gas dynamic laser 1 generates radiation 2 with a wavelength 10,6 microns. In the gasdynamic laser, the excitation energy comes from heat applied to the laser gas, which is initially at a pressure of several atmospheres. Gas dynamic effects on formation of carbon dimers in laserproduced plasmas k. It was invented by edward gerry and arthur kantrowitz at avco everett research.
The term laser is an acronym for light amplification by. T he gasdynamic laser gdl introduced a new method of cw power generation and set the stage for a new technology based on highpower gas laser. The results are presented of measurements of surface hardness and wear resistivity of rolling machine 2000 rolls which were under heat treatment by high power gas dynamic laser at cherepovetz metallurgy work. Gas dynamic effects on laser cut quality sciencedirect. Laser gas dynamic laser tnclasslfied unlimited closedloop gdi. Gas lasers using many gases have been built and used for many purposes. Surface hardness of rolls increased from 70 hsh to 80 85 hsh. B 1976, in highpower gas lasers, summer school iop, capri, italy, september 1975, p. The ls series provides exceptional beam quality, low noise, and dependability in a compact and affordable package. Pdf experimental study of optical gasdynamic processes. Fast, reliable, and competitively priced laser repair and replacement. Population inversion of the co2 molecule was achieved by expansion of heated test gas through a supersonic nozzle.
Finite volume computation of viscous flow in supersonic diffuser for gas dynamic laser. However, most of the previous research efforts journal of manufacturing processes vol. The opening chapters discuss the basic detailed physical phenomena that ultimately are responsible for producing gasdynamic laser action and the methods of. Internal structure and expansion dynamics of laser. Large gas lasers known as gas dynamic lasers use a combustion chamber and supersonic nozzle for population.
A xenon chloride xecl excimer laser consists of xenon a noble gas and chlorine a halogen combined to act as a lasing medium. Investigation of active media for a shortwave gas dynamic. This abbpatented technique offers numerous advantages compared to other laserbased techniques, but is also regarded as being disruptive in the industrial world as it displaces longestablished measurement technologies such as lead acetate tapes, chilled mirrors. The compressor power for this cycle is assumed to be supplied by a separate power system. Dynamic laser laser repair and replacement services. Latinautor sonyatv, sony atv publishing, ascap, warner chappell, cmrra, latinautor.
In addi tion, a plasmatron serves as a preionization source. Experimental study of optical gasdynamic processes of polymeric material ablation by ultrashort laser pulses. T he gasdynamic laser gdl introduced a new method of cw power generation and set the stage for a new technology based on highpower gaslaser. Xenon chloride excimer lasers properties and applications. Transverse flow is also used in another type of highpower co2 laser, the gasdynamic laser, shown in figure 2. Effect of nozzle shape on small signal gain in gas dynamic. Physical processes in lowtemperature gasdynamic lasers. Recent advances in roomtemperature, nearir and visible diode laser sources for telecommunication, highspeed computer networks, and optical data storage applications are enabling a new generation of gasdynamic and combustionflow sensors based on laser absorption spectroscopy. The radiation is directed on a concave focusing mirror 3 and, being reflected, impacts on a surface of test. The lasing medium gas has such properties that an energetically lower vibrational state relaxes faster than a higher vibrational state, and so a population inversion is achieved in a particular time. Isentropic equations are used to find flow properties throughout the nozzle and diffuser from the properties at their.
Ktalkherman and others published gas dynamic laser nozzleunit aerooptics find, read and cite all the research you need on researchgate. A carbon dioxide gasdynamic laser was operated over a range of reservoir pressure and temperature, testgas mixture, and nozzle geometry. The ls series laser systems offer a superior solution to those seeking unmatched quality in an iongas laser system. Laser fundamentals federation of american scientists. Gasdynamic effects of the interaction between a pulsed. Beam divergence and mirror deterioration were reduced by changes in optical cavity geometry. Dynamic lasers ls series laser systems offer a superior solution to those seeking unmatched quality in an iongas laser system. Figure 1 shows the calculated gai fonr a co2 gasdynamic laser utilizin ag mixture compose ofd 6. In the second section a thermally pumped gas dynamic laser included in a closed. Pdf gasdynamic laser nozzleunit aerooptics researchgate. In this paper, the basic design concept of a mobile gas dynamic co2 laser is introduced, and the possibility of using various types of lasers for solution of required. Measurements included shape, time, and energy of the laser output, and beam diameter. Both the cutting efficiency and cut quality are very sensitive to gas pressure and nozzle standoff distance because of the complex nature of shock fronts and associated phenomena in a supersonic gas jet impinging on a workpiece. Preliminary analysis of a lightgas gundriven gas dynamic.
An introduction is a 12chapter introductory text to major development generations of gasdynamic lasers, focusing on their underlying physical and fundamental aspects. Ktalkherman and others published gasdynamic laser nozzleunit aerooptics find, read and cite all the research you need on researchgate. N 1 to achieve the condition of population inversion between e 2 and e 1 at moderate pumping. Uses include confocal microscopy, life science research, optical disk mastering, and more. We estimated the efficiency of the binary high pressure emitting system being a tfe part. By reducing the laser exit gas temperature before compression, the mechan ical problems and high compressor work associated with high compressor inlet tempera tures are avoided. Ktalkherman and others published gasdynamic laser nozzleunit aerooptics find, read and cite all the research you need on. Hydrocarbonair mixture combustion gasdynamic laser jetp. Pdf jet engine based mobile gas dynamic laser for water. A quantitative theory of an electronbeamexcited carbon. Calculate flow relations for fanno lines, isentropic, normal shock, prandtlmeyer functions, and rayleigh lines. Mixing gasdynamic laser with nonequilibrium arc excitation. The light emitted from this type of laser is normally continuous wave cw. The basic concept consists of adding an appropriate nozzle and an expansion section to the pumptube end of the gas gun.
The laser medium gas has such properties that an energetically lower vibrational state relaxes faster than a higher vibrational state, thus a population inversion is achieved in a particular time. Xenon is a colourless, odourless, heavy, and stable noble gas. Both the heat and some components of the laser gas may come from. Gas dynamic effects on formation of carbon dimers in laser. A highly ionized xenon plasma, generated by a pulsed gas dynamic source of the shock tube with nozzle type, was used in the experiments.
In addition to conventional species concentration and density measurements, spectroscopic techniques for. When possible, these functions assume perfect gas environments. Effect of water vapor on output power of co 2 gasdynamic laser journal of the physical society of japan, vol. A portion of the lasers beam is passed through a modulator and fed back into the laser, causing the output beam to become pulsed. Chapter 7 lasers after having derived the quantum mechanically correct suszeptibility for an inverted atomic system that can provide gain, we can use the twolevel model to study the laser and its dynamics. The different mechanisms involved during a laser ablation process, including laser absorption, evaporation, transient gas dynamics, radiation transport, condensation, ionization and recombination, are rather complex and require further investigation. A gas dynamic laser gdl is a laser based on differences in relaxation velocities of molecular. One should note that if brewster angle windows are attached to the gas discharge tube, some laser radiation may be reflected out the side of the laser cavity. Pdf diode laser absorption sensors for gasdynamic and. Abstract one of drevs lightgas guns could be modified for use as a driver for a co2 gas dynamic laser. The efficiency of a co 2 laser is over 10% carbon monoxide or co lasers have the potential for very large outputs, but the use of this type of laser. The main engineering element of the shock tube is a diaphragmlike sliding piston in place of a rupturing diaphragm by which normal shock waves are. This paper reports on the design and performance of a large diameter diaphragmless shock tube that has been recently developed in order to experimentally study various basic characteristics of the gasdynamic laser gdl. Lgricos 950 series laser process analyzers accurately measure gas concentrations with extraordinarily high sensitivity, fast response and over a wide dynamic range in both simple and complex mixtures.
1277 199 279 851 1146 602 711 1199 689 443 1299 1231 255 1670 340 870 1428 9 34 1365 850 1430 848 805 201 1238 1396 1046 1463 1343 1370 163 718 1115 483 1016 1016