Femtosecond Third-Order Optical Nonlinearity of Au：Bi203 Nanocomposite Films

Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au：Bi2O3 nanocomposite films deposited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect （OKE） and pump probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6Ф×10^- 10 esu and 1.8 × 10.9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump probe measurement.     

集成温度传感器AD590的电路原理及其在测温和温控中的应用

介绍AD590型温度传感器的内部电路结构,阐述其工作原理,举例说明它在温度测量和恒温控制中的应用     

用集成温度传感器作信号检测的恒温控制电路

介绍集成温度传感器ＡＤ５９０的优点和特性，并用该传感器作探测器研制高精度恒温控制器。