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Author Brignon, Arnaud
Title Coherent Laser Beam Combining
Imprint Somerset : John Wiley & Sons, Incorporated, 2013
©2014
book jacket
Edition 1st ed
Descript 1 online resource (509 pages)
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
Note Coherent Laser Beam Combining -- Contents -- Preface -- Acronyms -- List of Contributors -- Part One: Coherent Combining with Active Phase Control -- 1 Engineering of Coherently Combined, High-Power Laser Systems -- 1.1 Introduction -- 1.2 Coherent Beam Combining System Requirements -- 1.3 Active Phase-Locking Controls -- 1.3.1 Optical Heterodyne Detection -- 1.3.2 Synchronous Multidither -- 1.3.3 Hill Climbing -- 1.4 Geometric Beam Combining -- 1.4.1 Tiled Aperture Combiners -- 1.4.2 Filled Aperture Combiners Using Diffractive Optical Elements -- 1.4.2.1 Overview of DOE Combiners -- 1.4.2.2 DOE Design and Fabrication -- 1.4.2.3 DOE Thermal and Spectral Sensitivity -- 1.5 High-Power Coherent Beam Combining Demonstrations -- 1.5.1 Coherent Beam Combining of Zigzag Slab Lasers -- 1.5.2 Coherent Beam Combining of Fiber Lasers -- 1.5.2.1 Phase Locking of Nonlinear Fiber Amplifiers -- 1.5.2.2 Path Length Matching with Broad Linewidths -- 1.5.2.3 Diffractive CBC of High-Power Fibers -- 1.5.2.4 CBC of Tm Fibers at 2 µm -- 1.6 Conclusion -- Acknowledgments -- References -- 2 Coherent Beam Combining of Fiber Amplifiers via LOCSET -- 2.1 Introduction -- 2.1.1 Beam Combination Architectures -- 2.1.2 Active and Passive Coherent Beam Combining -- 2.2 Locking of Optical Coherence by Single-Detector Electronic-Frequency Tagging -- 2.2.1 LOCSET Theory -- 2.2.2 Self-Referenced LOCSET -- 2.2.2.1 Photocurrent Signal -- 2.2.2.2 LOCSET Demodulation -- 2.2.3 Self-Synchronous LOCSET -- 2.3 LOCSET Phase Error and Channel Scalability -- 2.3.1 LOCSET Beam Combining and Phase Error Analysis -- 2.3.2 In-Phase and Quadrature-Phase Error Analysis -- 2.3.3 Two-Channel Beam Combining -- 2.3.4 16-Channel Beam Combining -- 2.3.5 32-Channel Beam Combining -- 2.4 LOCSET High-Power Beam Combining -- 2.4.1 Kilowatt-Scale Coherent Beam Combining of Silica Fiber Lasers
2.4.2 Kilowatt-Scale Coherent Beam Combining of Photonic Crystal Fiber Amplifiers -- 2.5 Conclusion -- References -- 3 Kilowatt Coherent Beam Combining of High-Power Fiber Amplifiers Using Single-Frequency Dithering Techniques -- 3.1 Introduction -- 3.1.1 Brief History of Coherent Beam Combining -- 3.1.2 Coherent Beam Combining: State of the Art -- 3.1.3 Key Technologies for Coherent Beam Combining -- 3.2 Single-Frequency Dithering Technique -- 3.2.1 Theory of Single-Frequency Dithering Technique -- 3.2.2 Kilowatt Coherent Beam Combining of High-Power Fiber Amplifiers Using Single- Frequency Dithering Technique -- 3.2.3 Coherent Polarization Beam Combining of Four High-Power Fiber Amplifiers Using Single-Frequency Dithering Technique -- 3.2.4 Target-in-the-Loop Coherent Beam Combination of Fiber Lasers Based on Single- Frequency Dithering Technique -- 3.3 Sine-Cosine Single-Frequency Dithering Technique -- 3.3.1 Theory of Sine-Cosine Single-Frequency Dithering Technique -- 3.3.2 Coherent Beam Combining of Nine Beams Using Sine-Cosine Single-Frequency Dithering Technique -- 3.4 Summary -- References -- 4 Active Coherent Combination Using Hill Climbing-Based Algorithms for Fiber and Semiconductor Amplifiers -- 4.1 Introduction to Hill Climbing Control Algorithms for Active Phase Control -- 4.1.1 Conventional SPGD-Based Control Algorithm for Active Phase Control -- 4.1.2 Orthonormal Dither-Based Control Algorithm -- 4.1.3 Multiple Detector-Based Control Algorithm -- 4.2 Applications of Active Phase Control Using Hill Climbing Control Algorithms -- 4.2.1 Semiconductor Amplifier Active Coherent Combination -- 4.2.1.1 Introduction to SCOWA Semiconductor Waveguide and Phase Control -- 4.2.1.2 Tiled Array Beam Combination -- 4.2.1.3 Single-Beam Active Coherent Combination Using Diffractive Optical Elements -- 4.2.2 Fiber Amplifier Active Coherent Combination
4.2.2.1 Introduction to Fiber Amplifier Active Beam Combination Architectures -- 4.2.2.2 Tiled Array Beam Combination -- 4.2.2.3 Single-Beam Active Coherent Combination Using Diffractive Optical Elements -- 4.3 Summary -- Disclaimer -- References -- 5 Collective Techniques for Coherent Beam Combining of Fiber Amplifiers -- 5.1 Introduction -- 5.2 The Tiled Arrangement -- 5.2.1 Calculation of the Far-Field Intensity Pattern -- 5.2.2 Influence of Design Parameters on the Combining Efficiency -- 5.2.2.1 Impact of the Near Field Arrangement -- 5.2.2.2 Impact of Collimation System Design and Errors -- 5.2.2.3 Impact of Phase Error -- 5.2.2.4 Impact of Power Dispersion -- 5.2.3 Beam Steering -- 5.3 Key Elements for Active Coherent Beam Combining of a Large Number of Fibers -- 5.3.1 Collimated Fiber Array -- 5.3.2 Collective Phase Measurement Technique -- 5.3.2.1 Principle of the Measurement -- 5.3.2.2 Implementation in the Experimental Setup -- 5.3.2.3 Phase Retrieval Techniques -- 5.3.3 Phase Modulators -- 5.4 Beam Combining of 64 Fibers with Active Phase Control -- 5.5 Beam Combining by Digital Holography -- 5.5.1 Principle -- 5.5.2 Experimental Demonstration -- 5.6 Conclusion -- Acknowledgments -- References -- 6 Coherent Beam Combining and Atmospheric Compensation with Adaptive Fiber Array Systems -- 6.1 Introduction -- 6.2 Fiber Array Engineering -- 6.3 Turbulence-Induced Phase Aberration Compensation with Fiber Array-Integrated Piston and Tip-Tilt Control -- 6.4 Target Plane Phase Locking of a Coherent Fiber Array on an Unresolved Target -- 6.4.1 Fiber Array Control System Engineering: Issues and Considerations -- 6.4.2 SPGD-Based Coherent Beam Combining: Round-Trip Propagation Time Issue -- 6.4.3 Coherent Beam Combining at an Unresolved Target over 7 km Distance -- 6.5 Target Plane Phase Locking for Resolved Targets
6.5.1 Speckle Metric Optimization-Based Phase Locking -- 6.5.2 Speckle Metrics -- 6.5.3 Experimental Evaluation of Speckle Metric-Based Phase Locking -- 6.6 Conclusion -- Acknowledgments -- References -- 7 Refractive Index Changes in Rare Earth-Doped Optical Fibers and Their Applications in All-Fiber Coherent Beam Combining -- 7.1 Introduction -- 7.2 Theoretical Description of the RIC Effect in Yb-Doped Optical Fibers -- 7.2.1 Introduction: Thermal and Electronic RIC Mechanisms -- 7.2.2 Description of the Spectroscopic Properties of Yb-Doped Optical Fibers -- 7.2.3 Description of the Electronic RIC Mechanism -- 7.2.4 Description of the Thermal RIC Mechanism -- 7.2.5 Comparison of Electronic and Thermal Contributions to the Pump-Induced Phase Shift -- 7.2.6 Phase Shifts in the Case of Periodic Pulse Pumping and in the Presence of Amplified Signal -- 7.2.7 Conclusion -- 7.3 Experimental Studies of the RIC Effect in Yb-Doped Optical Fibers -- 7.3.1 Previous Observations of the RIC Effect in Laser Fibers -- 7.3.2 Methodology of Pump/Signal-Induced RIC Measurements -- 7.3.3 Characterization of RIC in Different Fiber Samples -- 7.3.4 Phase Shifts Induced by Signal Pulses -- 7.3.5 Evaluation of the Polarizability Difference -- 7.3.6 Comparison of the RIC Effects in Aluminum and Phosphate Silicate Fibers -- 7.3.7 Conclusion -- 7.4 All-Fiber Coherent Combining through RIC Effect in Rare Earth-Doped Fibers -- 7.4.1 Coherent Combining of Fiber Lasers: Alternative Techniques -- 7.4.2 Operation Algorithm and Simulated Results -- 7.4.3 Environment Noise in Optical System to be Compensated -- 7.4.4 Combining of Two Er-Doped Amplifiers through the RIC Control in Yb-Doped Fibers -- 7.4.5 Extension Algorithm for Combining of N Amplifiers -- 7.4.6 Conclusion -- 7.5 Conclusions and Recent Progress -- References
8 Coherent Beam Combining of Pulsed Fiber Amplifiers in the Long-Pulse Regime (Nano- to Microseconds) -- 8.1 Introduction -- 8.2 Beam Combining Techniques -- 8.2.1 Filled and Tiled Apertures -- 8.2.2 Locking Techniques -- 8.2.2.1 Direct Phase Locking Techniques -- 8.2.2.2 Indirect Phase Locking Techniques -- 8.2.3 Requirements of Various Techniques -- 8.2.3.1 Indirect Phase Locking Techniques -- 8.2.3.2 Direct Phase Locking Techniques -- 8.2.4 Case of Pulsed Laser -- 8.3 Amplification of Optical Pulse in Active Fiber -- 8.3.1 Approximations and Validity Domain of the Calculation -- 8.3.2 Pulse Propagation in the Resonant Medium -- 8.3.3 Practical Calculation of the Output Pulse Based on the CW Regime -- 8.3.4 Pulse Shape Distortion -- 8.3.5 Influence of the Amplified Spontaneous Emission -- 8.4 Power Limitations in Pulsed Fiber Amplifiers -- 8.4.1 Physical Principle of the Stimulated Brillouin Scattering -- 8.4.2 SBS Gain -- 8.4.3 SBS Threshold Input Power -- 8.4.4 SBS Reduction -- 8.4.5 Domain of SBS Predominance -- 8.4.6 Physical Principle of the Stimulated Raman Scattering -- 8.4.7 Maximum Peak Power Achievable -- 8.5 Phase Noise and Distortion in Fiber Amplifiers -- 8.5.1 Phase Noise Measurement -- 8.5.2 In-Pulse Phase Shift Measurement -- 8.5.3 In-Pulse Phase Shift Calculation -- 8.5.3.1 Kerr-Induced Phase Shift -- 8.5.3.2 Gain-Induced Phase Shift -- 8.6 Experimental Setup and Results of Coherent Beam Combining of Pulsed Amplifiers Using a Signal Leak between the Pulses -- 8.7 Alternative Techniques for Pulse Energy Scaling -- 8.8 Conclusion -- References -- 9 Coherent Beam Combining in the Femtosecond Regime -- 9.1 Introduction -- 9.2 General Aspects of Coherent Combining over Large Optical Bandwidths -- 9.2.1 Description and Propagation of Femtosecond Pulses -- 9.2.2 Coherent Combining over a Large Bandwidth
9.2.3 Influence of Spectral Phase Mismatch on the Combining Efficiency
Laser beam combining techniques allow increasing the power of lasers far beyond what it is possible to obtain from a single conventional laser.One step further, coherent beam combining (CBC) also helps to maintain the very unique properties of the laser emission with respect to its spectral and spatial properties. Such lasers are of major interest for many applications, including industrial, environmental, defense, and scientific applications. Recently, significant progress has beenmade in coherent beam combining lasers, with a total output power of 100 kW already achieved. Scaling analysis indicates that further increase of output power with excellent beam quality is feasible by using existing state-of-the-art lasers. Thus, the knowledge of coherent beam combining techniques will become crucial for the design of next-generation highpower lasers. The purpose of this book is to present the more recent concepts of coherent beam combining by world leader teams in the field
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Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2020. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Link Print version: Brignon, Arnaud Coherent Laser Beam Combining Somerset : John Wiley & Sons, Incorporated,c2013 9783527411504
Subject Nonlinear optics.;Laser beams
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