An optofluidic device with tunable optical limiting property is proposed and demonstrated. The optofluidic device is designed for adjusting the concentration of graphene oxide (GO) in the ethanol solution and fabricated by photolithography technique. By controlling the flow rate ratio of the injection, the concentration of GO can be precisely adjusted so that the optical nonlinearity can be changed. The nonlinear optical properties and dynamic excitation relaxation of the GO/ethanol solution are investigated by using Z-scan and pump-probe measurements in the femtosecond regime within the 1.5 μm telecom band. The GO/ethanol solution presents ultrafast recovery time. Besides, the optical limiting property is in proportion to the concentration of the solution. Thus, the threshold power and the saturated power of the optical limiting property can be simply and efficiently manipulated by controlling the flow rate ratio of the injection. Furthermore, the amplitude regeneration is demonstrated by employing the proposed optofluidic device. The signal quality of intensity-impaired femtosecond pulse is significantly improved. The optofluidic device is compact and has long interaction length of optical field and nonlinear material. Heat can be dissipated in the solution and nonlinear material is isolated from other optical components, efficiently avoiding thermal damage and mechanical damage.
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机译:提出并证明了具有可调光学极限特性的光流体装置。该光流体装置设计用于调节乙醇溶液中氧化石墨烯(GO)的浓度,并通过光刻技术制造。通过控制注射剂的流速比,可以精确调节GO的浓度,从而可以改变光学非线性。通过使用飞秒范围内在1.5μm电信频段内的Z扫描和泵浦探针测量,研究了GO /乙醇溶液的非线性光学性质和动态激发弛豫。 GO /乙醇溶液具有超快的恢复时间。此外,光学极限性质与溶液浓度成比例。因此,可以通过控制注入的流量比来简单且有效地操纵光学极限特性的阈值功率和饱和功率。此外,通过采用所提出的光流装置证明了振幅再生。强度受损的飞秒脉冲的信号质量得到显着改善。该光流体装置是紧凑的,并且具有长的光场和非线性材料相互作用的长度。可以将热量消散在溶液中,并且非线性材料与其他光学组件隔离开,从而有效避免了热损伤和机械损伤。
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