Abstract
Due to the excellent electrochemical characteristics, Sb4O5Cl2 has been potentially used in flame retardant, catalyst, and anode materials, etc. At the same time, it has broad application prospects in optics and optoelectronics because of its strong inoxidizability, high damage threshold and relatively high-photoelectric conversion efficiency. However, the application of Sb4O5Cl2 in ultra-fast photonics has not been reported so far. In this work, the structure characteristic and nonlinear optics property of Sb4O5Cl2 have been systematically studied. The result indicates saturation intensity and modulation depth are 402.5 MW/cm2 and 1.3%, which prove Sb4O5Cl2 could be utilized as a saturable absorber (SA) in ultrafast photonics. Especially, harmonic mode-locking with 850-fs pulse duration, 2.86-nm 3-dB bandwidth, 202.3-MHz maximum repetition rate in optical communication region is generated based on a tapered fiber incorporated with Sb4O5Cl2 for the first time to our knowledge. This work opens novel avenues toward optoelectronics device based on Sb4O5Cl2 in the fields of optical modulation, optical detection and optical communication, etc.
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