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Self-starting mode-locked Tm-doped fiber laser using a hybrid structure of no core - graded index multimode fiber as the saturable absorber
摘要： We experimentally demonstrated a passively mode-locked all-fiber Tm laser using a no-core-graded-index multimode fiber structure as a saturable absorber based on the nonlinear multimode interference. Stable fundamentally mode-locking operation was obtained at a pump threshold of 180 mW. The output soliton pulses had a centre wavelength, spectral width, pulse duration, and repetition rate of 1895.7 nm, 3.3 nm, 1.25 ps, and 18.91 MHz, respectively. This is a simple, low-cost, stable, and convenient laser oscillator, with many potential applications in eye-safe ultrafast photonics.
关键词： Nonlinear multimode interference,Fiber laser,Mode-locked laser
更新于2025-11-28 14:24:03
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All-Fiber Saturable Absorbers for Ultrafast Fiber Lasers
摘要： The past decade has witnessed tremendous achievements of ultrafast ?ber laser technologies due to rapid developments of saturable absorbers (SAs) based on, in particular, nanomaterials such as 0D quantum dot, 1D carbon nanotubes, 2D layered materials, and 3D nanostructures. However, most of those nanomaterials-based SAs are inevitably absence of the high damage threshold and all-?ber integration, therefore challenging their applications on highly integrated and high-energy pulse generations. Recently, the real all-?ber SAs based on the nonlinear multimodal interference (NLMMI) technique using multimode ?bers are demonstrated to overcome the above limitations. In this review, a detailed summary of the recent advances in NLMMI-based all-?ber SAs is provided, including the fundamental theory, implementation scenarios, and ultrafast ?ber lasers of the all-?ber SAs, covering wide wavelength range of 1, 1.55, and 2 μm. In addition to the state-of-the-art overview, optical rogue waves in the all-?ber SA-based ultrafast ?ber laser are extensively analyzed, which reveals the laser physics behind the dynamics from low-energy to high-energy pulses and directs the design of high-energy ultrafast ?ber lasers. The conclusions and perspectives of the all-?ber SAs are also discussed at the end.
关键词： nonlinear multimode interference effect,high-energy pulse generation,saturable absorber,Ultrafast ?ber laser,optical rogue wave
更新于2025-09-11 14:15:04
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Femtosecond Soliton Erbium-doped Fiber Laser with a Symmetrical GIMF-SIMF-GIMF Saturable Absorber
摘要： A femtosecond soliton erbium-doped fiber ring laser with the symmetrical saturable absorber (SA) of graded index multimode fiber-step index multimode fiber-graded index multimode fiber (GIMF-SIMF-GIMF) is proposed and proved. Based on the nonlinear multimode interference (NL-MMI) effect of SA, the fiber laser achieved femtosecond soliton mode-locking operation and repetition rate tuning. The duration of soliton was 364 fs at 1562.5 nm and repetition rate was tunable from 10.29 MHz to 763.36 MHz. In the structure of SA, a short step index multimode fiber (SIMF) was inserted between two graded index multimode fibers (GIMFs) to generate more high-order modes，adjust the self-focusing length, and improve operation stability of mode-locked fiber laser. The SA also has the advantages of immunity to the external environment variation, high damage threshold and inoxidizability, which make the laser operate stably for a long time.
关键词： Femtosecond soliton,ultrafast fiber lasers.,mode-locked fiber lasers,nonlinear multimode interference
更新于2025-09-11 14:15:04