Fiber Lasers for the Generation of Ultrashort Pulses & Generation of Energetic Pulses in Fiber Lasers: The Mamyshev Oscillator

Fiber Lasers for the Generation of Ultrashort Pulses

Ultrashort pulse fiber lasers have emerged as a cornerstone technology in modern optics, offering unmatched stability, compact designs, and exceptional beam quality. In this lecture, we will recap the main features of fiber lasers, and we will explore the fundamental principles behind generating ultrashort pulses within optical fiber platforms. We will cover key mode-locking mechanisms—including active, passive, and nonlinear polarization evolution techniques—alongside chromatic dispersion management and optical nonlinearities.

Generation of Energetic Pulses in Fiber Lasers: The Mamyshev Oscillator

While ultrafast fiber lasers offer unmatched beam quality and stability, conventional mode-locking techniques hit severe energy limits due to non-linear optical wave breaking. The Mamyshev oscillator has emerged as a groundbreaking paradigm to overcome these barriers, enabling microjoule-level, high-peak-power ultrashort pulses directly from a fiber cavity. This lecture explores the physical principles driving this technology, focusing on non-linear spectral broadening followed by offset spectral filtering to achieve robust, pulsed operation. We will also examine critical design aspects such as pulse-seeding and alternative strategies to start the mode-locking regime.

About the Speaker

Federico Pirzio received the degree in Electronic Engineering in 2003, and the Ph.D. degree in Photonics in 2007 from the University of Pavia. He is Associate Professor at the Department of Electrical, Computer and Biomedical Engineering of the University of Pavia where he holds courses on Physics and Quantum Electronics.

Dr. Pirzio research interests include the design and numerical modeling of diode pumped solid state lasers sources, fiber lasers oscillators and amplifiers and highly customized laser systems in every functioning regime (continuous wave, nanosecond and sub-nanosecond Q-Switching regime and picosecond and femtosecond mode-locked regime). He also has a wide experience in the design of nonlinear frequency conversion stages based on both harmonic and parametric generation in the nanosecond, picosecond and femtosecond regime and characterization of new laser materials. He took part to several Italian and European research projects and collaborations with Italian and international companies in the field of industrial lasers throughout the last 20+ years.

Dr. Pirzio co-authored more than 80 papers on peer-reviewed international journals, about 50 communications at international conferences and 2 chapters in books.