We investigated the nonlinear optical properties of ReSe2. First, we measured the nonlinear absorption coefficient and the nonlinear refractive index of a ReSe2 thin film using open-aperture(OA) and closed-aperture(CA...We investigated the nonlinear optical properties of ReSe2. First, we measured the nonlinear absorption coefficient and the nonlinear refractive index of a ReSe2 thin film using open-aperture(OA) and closed-aperture(CA) Z-scan techniques. ReSe2 was shown to possess both saturable absorption and self-defocusing properties. The nonlinear absorption coefficient of ReSe2 was measured to be-5.67-0.35×103 cm^2∕GW, and its nonlinear refractive index was-2.81-0.13×10-2 cm^2∕GW at 1560 nm. Next, a fiberized saturable absorber(SA) based on ReSe2 was fabricated with a side-polished fiber platform and was tested as an ultrafast mode-locker capable of producing femtosecond pulses operating at a wavelength of 1560 nm. The estimated modulation depth and saturation power are 3.9% and 42 W, respectively, for the transverse electric mode, while they are 2.4% and 53 W for the transverse magnetic mode. Using the prepared SA, stable soliton pulses with a temporal width of 862 fs were produced from an erbium-doped fiber ring cavity. To the best of the authors’ knowledge, this is the first demonstration of using a ReSe2-based SA for femtosecond mode-locked pulse generation.展开更多
基金National Research Foundation of Korea(NRF)(2018R1A2B6001641)Institute for Information and Communications Technology Planning&Evaluation(IITP)(IITP-2019-2015-0-00385)
文摘We investigated the nonlinear optical properties of ReSe2. First, we measured the nonlinear absorption coefficient and the nonlinear refractive index of a ReSe2 thin film using open-aperture(OA) and closed-aperture(CA) Z-scan techniques. ReSe2 was shown to possess both saturable absorption and self-defocusing properties. The nonlinear absorption coefficient of ReSe2 was measured to be-5.67-0.35×103 cm^2∕GW, and its nonlinear refractive index was-2.81-0.13×10-2 cm^2∕GW at 1560 nm. Next, a fiberized saturable absorber(SA) based on ReSe2 was fabricated with a side-polished fiber platform and was tested as an ultrafast mode-locker capable of producing femtosecond pulses operating at a wavelength of 1560 nm. The estimated modulation depth and saturation power are 3.9% and 42 W, respectively, for the transverse electric mode, while they are 2.4% and 53 W for the transverse magnetic mode. Using the prepared SA, stable soliton pulses with a temporal width of 862 fs were produced from an erbium-doped fiber ring cavity. To the best of the authors’ knowledge, this is the first demonstration of using a ReSe2-based SA for femtosecond mode-locked pulse generation.
