High-Power Fiber Lasers

Dear Colleagues,

In 1961, just one year after the invention of the laser, the first demonstration of a fiber laser marked a milestone. Subsequent advancements, particularly in 1988 with the introduction of double-clad fiber, enabled an increase in the output power from mere milliwatts to substantial watts. The progression continued into the 21st century, witnessing a further increase in the power of fiber lasers utilizing ytterbium ion as the gain medium—from 100 W to 100 kW. Presently, high-power fiber lasers have found extensive applications in scientific research, industry and medicine, owing to their advantages such as high efficiency, high beam quality and flexible power transmission. Notably, these lasers have greatly advanced the applications of laser cutting, welding, cleaning, and additive manufacturing, thereby significantly promoting the development of sectors such as automobiles, shipbuilding, and aerospace. At the technical level, fiber lasers are evolving towards laser structure optimization, wavelength band extension, time domain adjustability, transverse mode controllability and power scaling. At the practical level, fiber lasers are aiming for high power, high efficiency, high beam quality, high reliability, high stability and low cost. Recent years have witnessed the emergence of novel laser structures, innovative optical fibers, and new pump source technologies. Furthermore, the integration of artificial intelligence technology has added new potentials to this evolution. We believe that the improved performance and expanded applications of high-power fiber lasers will make them more effective in serving the economy and benefiting human society.

This Special Issue aims to publish high-quality papers that study emerging and practical technologies in high-power fiber lasers. Research areas may include (but are not limited to) the following topics:

• High-power ytterbium-doped fiber lasers;
• High-power continuous wave fiber laser;
• High-peak-power pulsed fiber laser;
• High-power near-single-mode fiber laser;
• High-power fiber laser oscillator;
• High-power fiber laser amplifier;
• High-power oscillator amplifier integrated laser;
• Nonlinear effect in high-power fiber lasers;
• Transverse mode instability in high-power fiber laser;
• Fast simulation and modeling of high-power fiber laser;
• High-power single-frequency fiber amplifier;
• High-power narrow-line-width fiber amplifier;
• High-power fiber laser components;
• Novel transverse and longitudinal parameter controlled fiber;
• High-power crystal fiber;
• Ytterbium-doped short- and long-wavelength fiber laser;
• High-power novel wavelength laser such as green fiber laser;
• High-power-beam combined fiber laser;
• Other high-power fiber lasers and laser components.

Dr. Xiaolin Wang
Guest Editor

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• ytterbium-doped fiber laser
• fiber laser oscillator
• fiber laser amplifier
• multi cladding fiber
• transverse mode instability
• nonlinear effect
• single-frequency fiber laser
• narrow-linewidth fiber laser
• pulsed fiber laser
• quasi-continuous-wave fiber laser

Title: Polarimeter optical spectrum analyzer
Authors: Eyal Buks
Affiliation: Technion - Israel Institute of Technology
Abstract: We integrate a coherent optical spectrum analyzer with a rotating quarter wave plate polarimeter. The combined polarimeter optical spectrum analyzer (POSA) allows the extraction of the state of polarization with high spectral resolution. In this work, POSA is used to study two optical systems. The first is an optical modulator based on a ferrimagnetic sphere resonator. We explore the underlying magneto-optical mechanism that breaks time reversal symmetry, and consequently enables modulation having sideband asymmetry. The second system under study is a cryogenic fiber loop laser, which produces an unequally spaced optical comb. Polarization measurements provide insights on the nonlinear processes responsible for comb creation. Characterizations extracted from POSA data provide guidelines for performance optimization of applications based on these systems under study.