Visible-Wavelength All-Fiber Mode-Locked Vortex Laser

Sun, Honggang; Zou, Jinhai; Ruan, Qiujun; Dong, Chuchu; Dong, Zhipeng; Luo, Zhengqian

doi:10.1109/jlt.2021.3117997

Cited by 18 publications

(2 citation statements)

References 40 publications

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“…Apart from that, visible MLFL is a rather new topic and was reported recently for red lasers operating at ≈635 nm and investigation of the real-time dynamics could be interesting. [174][175][176] In addition, more MLFL at visible range can be explored in near future. For instance, a 3.6 W continuous wave praseodymium-doped green laser at ≈521 nm was demonstrated and supposed to achieve mode-locking operation.…”

Section: Challenges and Recommendationsmentioning

confidence: 99%

Real‐Time Investigation of Ultrafast Dynamics through Time‐Stretched Dispersive Fourier Transform in Mode‐Locked Fiber Lasers

Lau

Cui

Liu

et al. 2023

Laser & Photonics Reviews

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Real‐time investigation in mode‐locked fiber lasers (MLFLs) is important to understand the ultrafast dynamics before, during, and after the formation of stable laser pulses. However, the experimental measurement of these dynamics is restricted by the resolution of conventional oscilloscopes. The development of a time‐stretched dispersive Fourier transform (TS‐DFT) technique provides the shot‐to‐shot measurement of mapping the spectral information of an ultrashort optical pulse into time‐stretched waveform in the MLFL. Here, the recent progress and development of various fascinating dynamics in the MLFL, including the study of birth, evolution, and extinction process in MLFL, different types of MLFL, and complex motion dynamics in MLFL, have been reviewed. The issues and challenges encountered in this research area are discussed and several recommendations are suggested to overcome these problems. The integration of the TS‐DFT technique is expected to provide deeper insight into the real‐time investigation of various dynamics in the MLFL by displaying fascinating phenomenon and revealing unexplored trajectories.

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Section: Challenges and Recommendationsmentioning

confidence: 99%

Real‐Time Investigation of Ultrafast Dynamics through Time‐Stretched Dispersive Fourier Transform in Mode‐Locked Fiber Lasers

Lau

Cui

Liu

et al. 2023

Laser & Photonics Reviews

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“…Currently, the majority of visible fiber lasers leverage rare-earth-doped fluoride fibers (e.g., Pr3+, 24 Ho3+, 25 Dy3+, 26 and Er3+ 27 ) as the efficient gain medium. Over the years, significant progress has been made in achieving wavelength-tunable, 28 – 30 high-power, 31 – 37 Q-switched, 38 – 40 and mode-locked 41 – 46 visible rare-earth-doped fluoride fiber lasers. Although it has been very well demonstrated in the near-infrared, femtosecond mode locking in visible fiber lasers remains extraordinarily challenging and has not yet been reported, except for one related work on 1.6 ps visible fiber oscillator compressed to 168 fs duration outside the oscillator by a grating pair 46 .…”

Section: Introductionmentioning

confidence: 99%

635 nm femtosecond fiber laser oscillator and amplifier

Zou,

Ruan,

Chen

et al. 2024

Adv. Photon. Nexus

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Although visible femtosecond lasers based on nonlinear frequency conversion of Ti:sapphire femtosecond oscillators or near-infrared ultrafast lasers have been well developed, limitations in terms of footprint, cost, and efficiency have called for alternative laser solutions. The fiber femtosecond mode-locked oscillator as an ideal solution has achieved great success in the 0.9 to 3.5 μm infrared wavelengths, but remains an outstanding challenge in the visible spectrum (390 to 780 nm). Here, we tackle this challenge by introducing a visible-wavelength mode-locked femtosecond fiber oscillator along with an amplifier. This fiber femtosecond oscillator emits red light at 635 nm, employs a figure-nine cavity configuration, applies a double-clad Pr 3þ -doped fluoride fiber as the visible gain medium, incorporates a visible-wavelength phase-biased nonlinear amplifying loop mirror (PB-NALM) for mode locking, and utilizes a pair of customized high-efficiency and high-groove-density diffraction gratings for dispersion management. Visible self-starting mode locking established by the PB-NALM directly yields red laser pulses with a minimum pulse duration of 196 fs and a repetition rate of 53.957 MHz from the oscillator. Precise control of the grating pair spacing can switch the pulse state from a dissipative soliton or a stretched-pulse soliton to a conventional soliton. In addition, a chirped-pulse amplification system built alongside the oscillator immensely boosts the laser performance, resulting in an average output power over 1 W, a pulse energy of 19.55 nJ, and a dechirped pulse duration of 230 fs. Our result represents a concrete step toward high-power femtosecond fiber lasers covering the visible spectral region and could have important applications in industrial processing, biomedicine, and scientific research.

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