Journal
IEEE PHOTONICS JOURNAL
Volume 13, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2021.3079417
Keywords
Optical fiber devices; Fiber lasers; Optical fiber dispersion; Optical fiber polarization; Laser mode locking; Optical fiber filters; Optical fiber couplers; Fiber lasers; Yb-fiber lasers; ultrafast lasers; mode-locked lasers
Funding
- National Key R&D Program of China [2018YFB0407100]
- National Natural Science Foundation of China [11727812]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
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An all-polarization-maintaining mode-locked fiber laser operating in all-normal-dispersion regime has been proposed and implemented based on a nonlinear amplifying loop mirror. The laser can deliver pulses with spectral bandwidth from 0.5 to similar to 4 nm by changing the specific fiber length. Additionally, single wavelength and dual-wavelength operations can both be achieved with an improved Lyot filter, with experimental results consistent with numerical analysis.
We have proposed and implemented an all-polarization-maintaining mode-locked fiber laser operating in all-normal-dispersion regime based on nonlinear amplifying loop mirror. The required spectral filtering on the circulating chirped pulse was realized with a Lyot filter that was constructed by two carefully angle-spliced polarization-maintaining single-mode fibers within the laser resonator. The intrinsic inline fiber optical filter exhibited desirable features such as compact layout, adjustable versatility, and long-term stability. By changing the specific fiber length, our laser could deliver pulses with spectral bandwidth from 0.5 to similar to 4 nm. Furthermore, a continuously tunable single-wavelength operation and an asynchronous dual-wavelength operation can both be obtained with the laser setup including an improved Lyot filter, and the experimental observations agreed well with numerical analysis.
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