We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrac...We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrachloride under two different concentrations(0.004 and 0.008 mg/mL)and two different solution thicknesses(10 and 20 mm)are measured.The influences of concentration and thickness on the optical limiting effect of graphene dispersion are analyzed.Theoretical analysis of the experimental data shows that the main optical limiting mechanism of the new graphene dispersions is Mie scattering.The limiting capacity coefficient of the new graphene dispersion in carbon tetrachloride reaches 0.405 and the minimum transmittance reaches 0.292 when the concentration is 0.004 mg/mL and the thickness is 20 mm.The graphene dispersions in carbon tetrachloride can be used to achieve good nonlinear optical limiting effects at the wavelength of 3.8μm.展开更多
Brillouin scattering based optical fiber sensors(BOFS)have the unique advantages over other sensors such as long distance,fully distributed,and multi-parameter sensing.The progresses on the development of BOFS technol...Brillouin scattering based optical fiber sensors(BOFS)have the unique advantages over other sensors such as long distance,fully distributed,and multi-parameter sensing.The progresses on the development of BOFS technology in Nanjing University are reviewed.The key technologies to make BOFS with ultra-long distance,high spatial resolution,and fast measuring speed are discussed and realized.展开更多
A novel infrared broadband nonlinear optical limiting[NOL]technology based on stimulated Billouin scattering(SBS)in As_(2)Se_(3) fiber is proposed.The As_(2)Se_(3) fiber alows a weak infrared laser to pass through,but...A novel infrared broadband nonlinear optical limiting[NOL]technology based on stimulated Billouin scattering(SBS)in As_(2)Se_(3) fiber is proposed.The As_(2)Se_(3) fiber alows a weak infrared laser to pass through,but blocks an intense laser with the same wavelength due to the SBS effect.This NOL technology has been experimentally proved to have excellent NOL per-formance for incident pulsed lasers with a typical infrared wavelength of 3.6μm.The linear transmissions of 1 m and 0.5 m As_(2)Se_(3) fibers are higher than 90%,and the lowest nonlinear transmissions are reduced to 0.89%and 1.23%,respectively.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.62175105 and 61875086)the Fundamental Research Funds for the Central Universities(No.56XBC22047)。
文摘We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrachloride under two different concentrations(0.004 and 0.008 mg/mL)and two different solution thicknesses(10 and 20 mm)are measured.The influences of concentration and thickness on the optical limiting effect of graphene dispersion are analyzed.Theoretical analysis of the experimental data shows that the main optical limiting mechanism of the new graphene dispersions is Mie scattering.The limiting capacity coefficient of the new graphene dispersion in carbon tetrachloride reaches 0.405 and the minimum transmittance reaches 0.292 when the concentration is 0.004 mg/mL and the thickness is 20 mm.The graphene dispersions in carbon tetrachloride can be used to achieve good nonlinear optical limiting effects at the wavelength of 3.8μm.
基金This work was supported by National Basic Research Program of China(973 Program)under Grant No.2010CB327803 and National Natural Science Foundation of China(61027617).
文摘Brillouin scattering based optical fiber sensors(BOFS)have the unique advantages over other sensors such as long distance,fully distributed,and multi-parameter sensing.The progresses on the development of BOFS technology in Nanjing University are reviewed.The key technologies to make BOFS with ultra-long distance,high spatial resolution,and fast measuring speed are discussed and realized.
基金This work was supported by the National Natural Science Foundation of China(NSFC)(Nos.62175105 and 61875086).
文摘A novel infrared broadband nonlinear optical limiting[NOL]technology based on stimulated Billouin scattering(SBS)in As_(2)Se_(3) fiber is proposed.The As_(2)Se_(3) fiber alows a weak infrared laser to pass through,but blocks an intense laser with the same wavelength due to the SBS effect.This NOL technology has been experimentally proved to have excellent NOL per-formance for incident pulsed lasers with a typical infrared wavelength of 3.6μm.The linear transmissions of 1 m and 0.5 m As_(2)Se_(3) fibers are higher than 90%,and the lowest nonlinear transmissions are reduced to 0.89%and 1.23%,respectively.
