Peng Y, Cheng Z, Qiu J, Tang J, Zheng L
State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, 430074 Wuhan.
Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Jun;21(3):294-7.
In this paper the properties of an excited-state potassium Faraday anomalous dispersion optical filter in potassium vapor with a pump wavelength of 769.90 nm (i.e. 4S1/2-->4P1/2 transition) and a signal wavelength of 532 nm (i.e. 4P1/2-->8S1/2 transition) are calculated and discussed. The filter's transmissions versus the laser pump power and the external magnetic-field are obtained. The theoretical results show the transmission characteristics of the filter are relatively insensitive to the laser pump power and magnetic strength. The laser pump powers require range from 0.8 to 6 mW.cm-2. Our model predicts a peak transmission of 50% and an equivalent band-width of 4 GHz for the filter operating on the 4P1/2<--8S1/2 transition in potassium. The optical filter at 532 nm presented in this paper may be used to detect the practical and important frequency-doubled Nd:YAG laser.
本文计算并讨论了一种激发态钾法拉第反常色散光学滤波器的特性，该滤波器在钾蒸汽中，泵浦波长为769.90 nm（即4S1/2-->4P1/2跃迁），信号波长为532 nm（即4P1/2-->8S1/2跃迁）。得到了滤波器的透过率与激光泵浦功率及外部磁场的关系。理论结果表明，滤波器的传输特性对激光泵浦功率和磁场强度相对不敏感。激光泵浦功率要求范围为0.8至6 mW·cm-2。我们的模型预测，对于在钾中4P1/2<--8S1/2跃迁上工作的滤波器，峰值透过率为50%，等效带宽为4 GHz。本文介绍的532 nm光学滤波器可用于检测实际且重要的倍频Nd:YAG激光。
