Sideband-free tunable and switchable dual-wavelength mode-locked fiber laser based on the Lyot filter and spontaneous radiation peaks.

We demonstrate a compact tunable and switchable dual-wavelength fiber laser based on the Lyot filtering effect and the spontaneous radiation peaks of gain fiber. By introducing a period of polarization-maintain Er-doped fiber (PM-EDF), stable dual-wavelength pulses can operate in both the anomalous dispersion region and the normal dispersion region. The corresponding repetition frequency difference of the dual wavelengths has excellent stability while the relative center wavelength can be adjusted in the range of 5 nm to 13 nm. There is no existence of significant sidebands in the optical spectrum during the whole tuning process. This dual-wavelength laser based on two spontaneous radiation peaks in the shorter wavelength direction has great application potential. Our work provides a new design solution for dual-comb sources (DCSs).

Chemical constitutes and anti-obesity potential of seedlings of purple-leafed rice in high-fat diet induced obese mice.

The seedlings of purple leafed rice (SPLR) are characterized by high contents of anthocyanins and various polyphenols, whose total anthocyanin content can reach 15.16 mg g-1, indicating that SPLR may have many bioactivities. Therefore, in order to evaluate the anti-obesity potential value of SPLR, the nutrient components were first identified, and the anti-obesity effect of SPLR was evaluated with a high-fat diet (HFD) induced obese mouse model for 12 weeks. The results demonstrated that SPLR supplementation could alleviate HFD-induced obesity and suppress pro-inflammatory cytokine production and macrophage infiltration in epididymal white adipose tissue of HFD-induced obese mice. The findings indicated that supplementation with SPLR may contribute to preventing obesity and related complications.