Gasdynamic Lasers: An Introduction - 1st Edition - ISBN: 9780120569502, 9780323160445

Gasdynamic Lasers: An Introduction

1st Edition

Authors: John D. Jr. Anderson
eBook ISBN: 9780323160445
Imprint: Academic Press
Published Date: 28th January 1976
Page Count: 192
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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


Details

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

About the Author

John D. Jr. Anderson