Ke Feng, Haolin Yang, Pu Sun, Julian Evans, Sailing He
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The structure of double gain arms is the typical arrangement for Mamyshev oscillators (MOs), which is complex and costly compared with common mode-locking cavities. To pursue a simpler structure, single gain-arm MOs attract researchers. Realizing a single gain-arm structure in erbium (Er)-doped MOs encounters difficulties due to the intrinsic dispersion properties of silica fiber at 1.55 μm. Here, by utilizing a broadband band-pass filter in the cavity structure, we numerically and experimentally demonstrate an all-fiber Er-doped MO with a single gain arm. This single gain-arm Er-doped MO has a low mode-locking threshold and delivers a maximum output power of ∼16.68 mW corresponding to a pulse energy of ∼2.27 nJ. The mode-locking pulses with a repetition rate of ∼7.36 MHz have a pulse duration of ∼113 fs. We believe our work opens a way to achieve a single gain-arm Er-doped MO, which is attractive for practical applications.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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