Q-Switched Erbium-Doped Fiber Laser Using Cadmium Selenide Coated onto Side-Polished D-Shape Fiber as Saturable Absorber

摘要

A stable Q-switched erbium doped fiber laser emitting at 1558nm is demonstrated using a cadmium selenide (CdSe) material coated onto a side-polished D-shape fiber as the saturable absorber (SA).By elevating the input pump power from the threshold of 91 mW to the maximum available power of 136mW,a pulse train with a maximum repetition rate of 57.44kHz,minimum pulse width of 3.76μs,maximum average output power of 7.99mW,maximum pulse energy of 0.1391 μJ,and maximum peak power of 36.99mW are obtained.The signalto-noise ratio of the spectrum is measured to be around 75 dB.This CdSe based SA is simple,robust,and reliable,and thus suitable for making a portable pulse laser source.