High-energy all-fiber Er-doped femtosecond chirped-pulse amplification system seeded by nonlinear multimodal interference mode-locked fiber laser

Ahmad, Harith and Ithnahaini, M.U.M. and Samion, Muhamad Zharif and Zaini, Muhammad Khairol Annuar and Ismail, Mohammad Faizal and Bayang, Leonard and Thambiratnam, Kavintheran and Ortaç, Bülend (2025) High-energy all-fiber Er-doped femtosecond chirped-pulse amplification system seeded by nonlinear multimodal interference mode-locked fiber laser. Optical Fiber Technology, 93 (1). pp. 1-6. ISSN 1068-5200 E-ISSN 1095-9912

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Abstract

We report a high-energy femtosecond 1.5 µm all-fiber source based on chirped-pulse amplification (CPA) of soliton pulses generated by a multimodal interference. The erbium-doped mode-locked fiber seed source utilizes a nonlinear multimodal interference-based saturable absorber designed with a single-multi-single (SMS) mode fiber configuration, which can generate femtosecond soliton pulses. A commercially available ultra-high numerical aperture fiber with normal group velocity dispersion stretches the pulses up to a duration of 5.14 ps. These stretched pulses are amplified in pre- and main amplification stages to achieve watts-level average output power. Additionally, single-mode fiber (SMF) effectively compresses the pulses back down to femtosecond duration. The CPA configuration provides output power, pulse width, and repetition rate of 1.34 W, 580 fs, and 14.7 MHz, respectively, measured at a central wavelength of 1563 nm. The CPA performance yields a pulse energy of 91.2 nJ and a peak power of 157 kW. Notably, the system exhibits stable output with a minimal average output power fluctuation of 0.08 dB, indicating a stable laser performance. © 2025

Item Type:	Article (Journal)
Additional Information:	Cited by: 1
Uncontrolled Keywords:	Chirp modulation; Delta sigma modulation; Erbium doped fiber amplifiers; Mode-locked fiber lasers; Pulse repetition rate; Pulse width modulation; Single mode fibers; Sols; Ultrashort pulses; All fiber; Chirped-pulse-amplification; Energy; Femtoseconds; Mode-locked; Modelocking; Multi-modal; Nonlinear multimodal interference; Single-mode fibers; Soliton pulse; Saturable absorbers
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Ts. Dr. Kavintheran Thambiratnam
Date Deposited:	19 Nov 2025 09:24
Last Modified:	19 Nov 2025 09:24
Queue Number:	2025-11-Q048
URI:	http://irep.iium.edu.my/id/eprint/124458

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