Gasdynamic Lasers: An Introduction

Gasdynamic Lasers: An Introduction

1st Edition - January 28, 1976

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  • Author: John D. Jr. Anderson
  • eBook ISBN: 9780323160445

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Description

Gasdynamic Lasers: An Introduction is a 12-chapter introductory text to major development generations of gasdynamic lasers, focusing on their underlying physical and fundamental aspects. The opening chapters discuss the basic detailed physical phenomena that ultimately are responsible for producing gasdynamic laser action and the methods of calculating the performance of these devices. These topics are followed by a chapter on confirmation of the performance calculations through arc and shock tunnel experiments. The discussion then shifts to vibrational relaxation process behind normal shock waves in CO2-N2-He mixtures and assesses their population inversions occurring in the nonequilibrium flow. Other chapters explore the concepts of downstream mixing and optical cavity in gasdynamic lasers, as well as the laser beam extracted from these devices. A systematic study of aerodynamic windows that use supersonic flow across the aperture is presented in the concluding chapters, along with the phenomena associated with gasdynamic laser diffusers. This introductory text will be of great value to professional scientists and engineers, as well as to students and workers in the field who are interested in interdisciplinary applied science.

Table of Contents


  • Preface

    Acknowledgments

    Chapter I Introduction

    Chapter II Elementary Physics

    2.1 Energy Levels and Population Inversion

    2.2 Why Does a Population Inversion Make a Laser Work?

    2.3 Definition and Calculation of Small-Signal Gain

    Chapter III Thermodynamics and Vibrational Kinetics of the CO2-N2-H2O OR He Gasdynamic Laser

    3.1 Molecular Properties of CO2 and N2

    3.2 Vibrational Energy and Population Distribution

    3.3 Vibrational Kinetics

    3.4 Vibrational Rate Equations

    Chapter IV Calculation Of Gasdynamic Laser Performance

    4.1 Analysis of the Flow Field

    4.2 Vibrational Model

    4.3 Results

    4.4 Comparison with Basov

    4.5 Coupled and Uncoupled Flows

    4.6 Recapitulation

    4.7 Power Extraction

    Chapter V Comparison Between Theory and Experiment

    5.1 Kinetic Rate Data

    5.2 Nonequilibrium Gasdynamics

    5.3 Small-Signal Gain

    5.4 NOL 3-MW Arc Tunnel

    5.5 NOL 12.7-cm Shock Tunnel

    5.6 Arc Tunnel Experiments

    5.7 Shock Tunnel Experiments

    5.8 Other Experiments

    Chapter VI Inversions Behind Normal Shock Waves

    Chapter VII CO2-N2 Gasdynamic Lasers: State-Of-The-Art

    7.1 Introduction

    7.2 Increased H2O Content

    7.3 Increased Temperature

    7.4 Binary Scaling

    7.5 Fuels for Gasdynamic Lasers

    Chapter VIII The Carbon Monoxide Gasdynamic Laser

    8.1 Introduction

    8.2 The Physical Process

    8.3 Results

    8.4 Disadvantage

    Chapter IX Downstream Mixing Gasdynamic Lasers

    9.1 Introduction

    9.2 Problems

    9.3 Results

    Chapter X Optical Cavity Considerations for Gasdynamic Lasers

    10.1 Introduction

    10.2 Cavity Types

    10.3 Causes of Beam Distortion in Gasdynamic Lasers

    Chapter XI Aerodynamic Windows

    11.1 Introduction

    11.2 Concepts

    11.3 Results

    11.4 Summary

    Chapter XII Diffusers

    12.1 Introduction

    12.2 Purpose of the Diffuser

    12.3 Diffuser Flow Field

    12.4 Normal Shock Recovery

    12.5 Area Ratio

    12.6 Drop-Out Pressure

    12.7 Summary

    Appendix A Effect of Uncertainties in the Kinetic Rates

    Appendix B Vibrational Relaxation Times for the CO2-N2-H2O OR He System

    Appendix C The Teare Effect

    References

    Index


Product details

  • No. of pages: 192
  • Language: English
  • Copyright: © Academic Press 1976
  • Published: January 28, 1976
  • Imprint: Academic Press
  • eBook ISBN: 9780323160445

About the Author

John D. Jr. Anderson

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