Physical Processes in Lasers

ISBN-13: 9781468416046 / Angielski / Miękka / 2012 / 181 str.

D. V. Skobel Tsyn; D. V. Skobel Tsyn

Opis

The present collection of articles sets forth the results of experimental research on physical processes in various types of optical quantum devices (lasers). Data are presented on the regulation of the temporal and spectral characteristics of solid-state lasers using a bleachable filter. A mode self-locking state is realized in which ultraflhort light pulses are emitted. The stimulated emission in a pinch discharge due to transitions of singly and doubly ion ized argon atoms in the visible and ultraviolet parts of the spectrum is investigated. Pulsed lasing associated with electron transitions in diatomic molecules at the leading edge of a power ful current pulse in a gas is subjected to systematic analysis. The book is aimed at a broad spectrum of scientists and engineers specializing in quan tum radiophysics. CONTENTS MODE DISCRIMINATION AND THE SELF-LOCKING EFFECT IN SOLID-STATE LASERS USING A BLEACHABLE FILTER A. S. Markin Introduction 1 Chapter 1. Q S wit chi n g 0 f Las e r s by Mea n s 0 f a Pas s i v e Shu t t e r. . . . 5 1. Operating Principle and Types of Passive Shutters. . . . . . . . . . . . . . . . . . . . 5 2. Q Switching of Neodymium Glass Lasers by Means of a Bleachable Liquid Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3. Dependence of the Width and Shape of the Giant Pulse on the Population Inversion Coefficient. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ."

Spis treści

Mode Discrimination and the Self-Locking Effect in Solid-State Lasers Using a Bleachable Filter A. S. Markin.- 1. Q Switching of Lasers by Means of a Passive Shutter.- 1. Operating Principle and Types of Passive Shutters.- 2. Q Switching of Neodymium Glass Lasers by Means of a Bleachable Liquid Filter.- 3. Dependence of the Width and Shape of the Giant Pulse on the Population Inversion Coefficient.- 2. Spectral Composition of Solid-State Laser Emission and Mode Discrimination by Various Cavity Elements.- 1. Spectral Composition of Solid-State Laser Emission.- 2. Mode Discrimination in Neodymium Glass Lasers with a Passive Shutter Due to Fresnel Reflection at the Ends of the Active Rod.- 3. Selective Properties of Various Cavity Elements and Their Influence on the Emission Spectrum of Solid-State Lasers.- 3. Development of the Emission Pulse in the Case of Passive Switching.- 1. Giant-Pulse Buildup in a Q-Switched Laser.- 2. Determination of the Giant-Pulse Buildup Time in a Neodymium Glass Laser with a Passive Shutter.- 3. Determination of the Buildup Time for a Free-Oscillation Spike in a Neodymium Glass Laser.- 4. Self Mode Locking in a Solid-State Laser Using a Bleachable Filter.- 1. Theoretical Model of the Self-Locking Process.- 2. Dependence of the Self-Locking Effect on the Position of the Bleachable Filter in the Cavity.- 3. Self-Locking in Neodymium Glass and Ruby Lasers with a Bleachable Filter in the Case of a Broad Emission Spectrum; Ultimately Narrow Width of Ultrashort Pulses in Lasers of This Type.- Literature Cited.- Detection and Investigation of Stimulated Emission in a Pinched Discharge V. M. Sutovsk.- 1. State of the Art of Pulsed Ionic Laser Research.- 2. On the Creation of Negative-Temperature States in a Pinch-Discharge Plasma.- 1. Physical Processes in a Pinch Discharge.- 2. Possible Mechanisms of the Formation of Negative-Temperature States in the Pinch-Discharge Plasma.- 3. On the Experimental Program.- 3. Investigation of the Characteristics of a Pinch Discharge.- 1. Description of the Experimental Setup.- 2. Discharge Electrotechnical Parameters.- 3. Probe Measurements of Current Distribution over the Discharge Tube Cross Section.- 4. High-Speed Photoscanning of Pinch Radiation.- 5. Discharge Spectral Characteristics.- 4. Properties of Stimulated Emission in a Pinch-Discharge Plasma at the Transitions of Singly and Doubly Ionized Argon Atoms.- 1. Properties of Emission by Ar II Ions.- 2. Emission at Ar III Transitions in the Ultraviolet Spectral Region.- 3. Emission in Subsequent Discharge Current Half-periods.- 4. Emission at the 4764.89Å Line for Discharge Current Pulses Having a High Repetition Rate.- Chapters 5. Determination of the Parameters of the Pinch-Discharge Plasma.- 1. Theoretical Foundation of the Applicability of Plasma Diagnostic Methods.- 2. Measurement Procedure and Results.- 3. Feasibility of Plasma Diagnostics Based on the Self-Induced Emission of a Pinch Discharge.- Discussion.- Literature Cited.- Physical Processes in Molecular Hydrogen, Deuterium, and First-Positive-Band-System Nitrogen Pulsed Gas-Discharge Lasers I. N. Knyaze.- 1. State of the Art of Research on Pulsed Gas-Discharge Lasers; Statement of the Problem.- 1. General Description of Pulsed Gas Laser Research.- 2. Brief Survey of the Literature on Lasers Operating on Electron Transitions in Diatomic Molecules; Statement of the Problem.- 2. Experimental Methodological Problems.- 1. The Laser and Its Excitation Circuit.- 2. Spectral Measurements.- 3. Gas-Discharge Measurement Technique.- 3. Pulsed Emission from H2, D2, and HD Molecules.- 1. The Stimulated Emission Spectrum.- 2. Electron States and Transitions in H2, D2, and HD Molecules; Qualitative Inversion Mechanism.- 3. Singular Characteristics of the Excitation of Rotational Spectral Structure in Hydrogen and Deuterium Lasers.- 4. Temporal and Energy Characteristics of the First-Positive-Band-System Molecular Nitrogen Laser.- 5. Stimulated Emission Spectrum of the N2(+1) Laser and Interpretation of the Vibrational-Rotational Structural Features of this Spectrum.- 1. The Stimulated Emission Spectrum.- 2. Electron States and Transitions in N2; Analysis of Excitation of the Vibrational and Rotational Structure of the Laser Emission Spectrum.- 6. Aspects of the. Physics of Pulsed Discharge.- 1. Pulsed-Discharge and Inversion Dynamics of the N2(+1) Laser.- 2. Temporal Evolution of the High-Current Discharge Phase; Physical Model of Discharge.- 7. Population Dynamics of the Upper Laser Levels in the 1+ Band System of N2.- 1. On the Excitation Mechanism for the Upper Laser Levels.- 2. Critical Analysis of the Mechanism of Step-by-Step Filling of the Laser Levels.- 3. Lasing Cutoff Mechanism; Simplified Laser-Level Diagram.- 8. Elementary Quantitative Theory of Laser Action in the 1+ Band System of N2.- 1. Population Inversion Dynamics.- 2. On the Ultimate Laser Power.- 3. Ultimate Efficiency of the N2(1+) Laser.- Conclusion.- Literature Cited.