Abstract
Titanium selenide saturable absorber mirror (TiSe2-SAM) is fabricated by a combination of magnetron sputtering method and chemical vapor deposition method. With the optical circulator, the TiSe2-SAM is flexibly injected in the experimental cavity as the saturated absorber, and a steady Q-switched Er-doped fiber (EDF) laser is established. The modulation depth of TiSe2-SAM is measured to be 25.92%. Through appropriately adjusting the polarization states and changing the pump power, the shortest pulse duration and maximum output power of the passive Q-switched EDF laser are 1.126 μ s and 11.54 mW, respectively. The adjustable range of the repetition rate is 70–154 kHz, and the signal to noise ratio is greater than 62 dB. To our best knowledge, there is no report on Q-switched EDF lasers based on TiSe2 up to now, and our new attempt on TiSe2-based Q-switched EDF laser proves that TiSe2 as a powerful candidate is promising in ultrafast optical generation for the characteristics of high modulation depth and high stability.
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