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检索条件"任意字段=Conference on Modeling and Simulation of Higher-Power Laser Systems IV"

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Numerical designs of 100-kW class solid-media lasers

引用

conference on modeling and simulation of higher-power laser systems iv

作者： Basu, S Depsky, J Shah, R Endo, T Rocketdyne Div./Boeing North American Inc. (United States)

ISBN: (纸本)0819424005

In this paper, we have reviewed the design principles and numerical formalisms applicable to push the average power limits of state-of-the-art solid-media lasers from typically 1 kilowatt to hundreds of kilowatt. Several device architectures are considered, taking into account utilization of off-the-shelf technology, and inclusion of realistic values of propagation loss. We demonstrate that once the beam propagation problem is addressed properly, laser devices employing solid-media are capable of producing 100 kW to 1 MW of average output power in cw operation at 6 to 12% wall plug efficiency. This will open up applications for solid-media lasers where gaseous and chemical lasers are currently used.

关键词： solid-state laser amplifier beam propagation finite element power scaling temperature stress oscillator dynamic gain medium diode laser Neodymium Ytterbium YAG glass high power laser

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Analytical model for output optimization of fiber-coupled laser-diodes end-pumped lasers

引用

conference on modeling and simulation of higher-power laser systems iv

作者： Chen, YF Wang, SC Huang, TM Kao, CF Wang, CL Precision Instrument Development Ctr. (Taiwan) National Chiao Tung Univ. (Taiwan)

ISBN: (纸本)0819424005

A general model has been developed for the output power optimization of fiber-coupled laser-diode end-pumped lasers by including the thermal effect into the analysis. The optical path difference (OPD) distribution has been derived as a function of the pump-beam quality, focus position of pumping light, and pump radius at the focal plane under the assumption that the end faces of the crystal are thermally insulated. With the derived OPD, the diffraction losses arising from thermal-induced spherical aberration have been estimated by the Strehl intensity ratio. The practical example of a Nd:YVO4 laser pumped by a 1.2 W fiber-coupled laser diode is considered to illustrate the utility of the present model. Experimental results have shown a fairly good agreement with the theoretical predictions.

关键词： thermal effect pump-beam quality output power optimization fiber-coupled laser-diodes

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modeling of chemical oxygen-iodine lasers

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conference on modeling and simulation of higher-power laser systems iv

作者： Yang, TT Cover, RA Quan, V Smith, DM Bauer, AH McDermott, WE Copeland, DA Rocketdyne Div./Boeing North American Inc. (United States)

ISBN: (纸本)0819424005

A detailed engineering model for chemical oxygen-iodine laser (COIL) performance modeling and design predictions has been developed. In this model, mixing between the primary oxygen flow and the secondary iodine injectant is treated using a two-stage/three-stream model based on the flow characteristics of the transverse injection mixing scheme. Iodine dissociation, excited state pumping and quenching are treated using the standard Phillips Laboratory COIL kinetics package. Stable resonator optical extraction is described by a rooftop geometric optics model. These models have been incorporated into the two-dimensional Advanced Cavity Code for COIL (AC(3)). The validity of the mixing, kinetics, and optics models used in this code has been tested by comparing the predictions of the model with the iodine dissociation, laser small signal gain, and optical power data measured using the high pressure RotoRADICL device. Selected small signal gain and output power measured using the low pressure RotoCOIL were reproduced by the models. modeling of the high efficiency RADICL data obtained with various nozzle throat heights using this model shows good agreement with power. The good agreement with the data obtained from various devices encompassing a broad rang of experimental parameters lends credibility to this model.

关键词： Data modeling Iodine Oxygen RADICL Chemical oxygen iodine lasers Performance modeling Instrument modeling Chemical lasers Geometrical optics Platinum

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simulations of the lasing properties of a thin disk laser combining high output powers with good beam quality

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conference on modeling and simulation of higher-power laser systems iv

作者： Contag, K Brauch, U Erhard, S Giesen, A Johannsen, I Karszewski, M Stewen, C Voss, A Univ. Stuttgart (Germany) DLR Stuttgart (Germany)

ISBN: (纸本)0819424005

A model to predict the optical efficiency and beam quality obtained from a diode pumped high-power thin disk laser will be presented. The laser consists of a linear resonator with the quasi-three-level laser active material Yb:YAG placed as a thin disk on a cooling finger. The laser crystal is pumped by a near flat-top pump beam profile in a multiple pass configuration. Cw-output powers of 255 W at pump powers of 519 W have been achieved experimentally. Within the model the temperature distribution inside the crystal is calculated, taking into account the mutual dependence of temperature (and thus level population) and pump light absorption. The pump beam power distribution is modeled by Monte-Carlo-ray-tracing. The resonator is simulated by selfconsistently circulating the power distribution within the resonator via transformations into a suitable mode system and back, using simple matrix multiplication. Thermal lensing due to thermooptical and mechanical deformations is considered, using the results of finite-element-modeling. The resulting optical efficiency and beam quality have been calculated. The dependence on variables like temperature, dimensions of the pump beam source, number of pump beam passes and crystal thickness will be discussed.

关键词： high power diode pumped laser thin disk laser Yb:YAG modeling optical efficiency beam quality

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Numerically calculated Q-switched laser output characteristics of high power diode laser-pumped Nd:YAG laser

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conference on modeling and simulation of higher-power laser systems iv

作者： Kundu, P Shaligram, AD Saxena, VN Institute of Armament Technology (India) Univ. of Pune (India)

ISBN: (纸本)0819424005

A numerical model for high power diode laser-pumped Q-switched Nd:YAG laser is presented. Number of models based on analytical methods for describing the performance effects of diode-pumped solid-state (DPSS) lasers have appeared in the literature. But very few numerical models have so far been reported Our model based on the numerical method takes into account all operational characteristics of pump laser diode at 808 nm, all opto-geometric and spectroscopic parameters of Nd:YAG crystal, the cavity parameters and various losses including Q-switch loss. Only the thermal lensing effect is excluded in the model. The model has been described to be simple, flexible with on-line graphics facility. It has been tested in we of Q-switched Nd:YAG laser experimental results of which are in close agreement with those predicted by the model. The model can efficiently and accurately compute the Q-switched pulse energy, energy stored in the gain medium, pulse width etc. Efforts are now being made to generalize and improve the predictive capability of the model so that it can be extended to other solid-state laser crystals optically pumped by laser diodes. It is expected that generalized mathematical model will be highly proficient and interactive to accurately predict the laser output.

关键词： laser diode pumping Q-switching Nd:YAG crystal

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Numerical modeling on pulse discharge for a high power fast-axial-flow CO2 laser

Numerical modeling on pulse discharge for a high power fast-...

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modeling and simulation of higher-power laser systems iv

作者： Peng, Xiaoyuan Li, Shimin Xu, Lei National Engineering Research Center for Laser Processing Huazhong University of Science and Technology Wuhan 430074 China Image Technology and Development Company Huazhong University of Science and Technology Wuhan 430074 China

The numerical modeling on pulse discharge for a high power carbon-dioxide laser was developed to describe and predict laser operating characteristics. The influence of turbulence and convection on the output of a high power fast axial flow carbon-dioxide laser is especially considered in this paper. An obvious requirement is that the pulse has a precisely specified time shape in order to obtain well-controlled optical pulse. The active medium is described by assuming a five-temperature model and balancing the quantum densities of vibrational states of the CO2 and N2 molecules. The conclusions are very helpful to realize pulse operation in cw carbon-dioxide lasers, especially in the laser equipment which is applied to drilling, welding and cutting. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： Numerical models

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modeling of high power cw Nd:YAG laser welding

Modeling of high power cw Nd:YAG laser welding

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modeling and simulation of higher-power laser systems iv

作者： Dumord, Evelyne Jouvard, Jean-Marie Grevey, Dominique F. IUT Le Creusot 12 rue de la Fonderie 71200 Le Creusot France

The model developed allows us to know the temperature field in a cw Nd:YAG laser joining piece. To realize the model, a physical approach has been used for defining the heat sources. First, from a pressures balance the geometry of the keyhole is determined. Then, an analysis of the plume existing at the surface of the target shows that the beam is scattered by the plume and consequently one more heat source must be considered. The spectrometric characterization indicates that no ionized particles exist in the plume and certainly in the keyhole. So Fresnel absorption must be the predominant effects for energy absorption in the keyhole. This assumption has been verified owing to Fresnel absorption coefficient measurements. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： Yttrium aluminum garnet

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Two-dimensional source flow gain model for the chemical oxygen-iodine laser

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conference on modeling and simulation of higher-power laser systems iv

作者： Copeland, DA Yang, TT Rocketdyne Div. of Boeing North American Inc. (United States)

ISBN: (纸本)0819424005

A source flow gain model for optical extraction from the chemical oxygen-iodine laser medium is presented. In this model the gasdynamics of the reactive flow through the optical cavity, transverse to the optical axis, is described by the two-dimensional boundary-layer approximation to the full Navier-Stokes equations. The appropriate mass continuity, species, momentum, and energy conservation equations in cylindrical polar coordinates are presented and discussed. The gas kinetics is described by a reduced set of fourteen reactions among nine chemical species and includes pumping of the upper laser level by O-2((1) Delta), deactivation by water and energy pooling with O-2((1) Delta), and the Heidner molecular I-2 dissociation mechanism. Stimulated emission on the 3 --> 4 hyperfine transition of atomic iodine is described by a generalized version of the Zagidullian gain model which includes finite hyperfine relaxation of the P-2(1/2) and P-2(3/2) iodine sublevels, velocity cross-relaxation of the iodine atoms, and allows for incomplete I-2 dissociation. The model is illustrated by application to a laboratory-sized device and the effects of the boundary layer upon the gas flow, I-2 dissociation, O-2((1) Delta) fraction, small signal gain, optical extraction, and the medium homogeneity are examined.

关键词： Iodine Oxygen Chemical lasers Optical resonators Resonators Diffusion Doppler effect Molecules Chemical oxygen iodine lasers Chemical species

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modeling high brightness kW solid-state lasers

Modeling high brightness kW solid-state lasers

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modeling and simulation of higher-power laser systems iv

作者： Holleman, Gerald W. Harpole, George M. Injeyan, Hagop Moyer, Richard H. Valley, Marcy M. Machan, Jason P. St. Pierre, Randall J. Berg, Jacqueline G. Marabella, Leonard J. TRW Space and Electronics Group One Space Park Redondo Beach CA 90278 United States

Several kW-class solid-state lasers at TRW are described with an emphasis on the performance modeling used to aid development of high brightness operation. Comparisons of results and analysis are presented for key aspects of high power, diode pumped, Nd:YAG lasers and amplifiers that use zigzag slab configurations to minimize thermal effects. Devices described include multi-kW power oscillators suitable for high power machining, welding, and material processing;and phase conjugated master oscillator/power amplifiers (MOPAs) which provide short pulse, high brightness beams for active tracking, photolithography, or remote sensing. Laboratory measurements are in good agreement with predictions of diode pump profile and absorption efficiency;slab extraction efficiency and thermal load;and slab OPD. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： Efficiency

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Optical modeling of the Jefferson Laboratory IR demo FEL

Optical modeling of the Jefferson Laboratory IR demo FEL

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modeling and simulation of higher-power laser systems iv

作者： Neil, George R. Benson, Stephen V. Shinn, Michelle D. Davidson, Paul C. Kloeppel, Peter K. Thomas Jefferson National Accelerator Facility 12000 Jefferson Avenue Newport News VA 23606 United States

The Thomas Jefferson National Accelerator Facility (formerly known as CEBAF) has embarked on the construction of a 1 kW free-electron laser operating initially at 3 microns that is designed for laser-material interaction experiments and to explore the feasibility of scaling the system in power and wavelength for industrial and Navy defense applications. The accelerator system for this IR demo includes a 10 MeV photocathode-based injector, a 32 MeV CEBAF-style superconducting radio-frequency linac, and single-pass transport which accelerates the beam from injector to wiggler, followed by energy-recovery deceleration to a dump. The electron and optical beam time structure in the design consists of a train of picosecond pulses at 37.425 MHz pulse repetition rate. The initial optical configuration is a conventional near-concentric resonator with transmissive outcoupling. Future upgrades of the system will increase the power and shorten the operating wavelength, and utilize a more advanced resonator system capable of scaling to high powers. The optical system of the laser has been modeled using the GLAD code by using a Beer's-law region to mimic the FEL interaction. Effects such as mirror heating have been calculated and compared with analytical treatments. The magnitude of the distortion for several materials and wavelengths has been estimated. The advantages as well as the limitations of this approach are discussed. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： Free electron lasers

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