公开(公告)号：US4879468A

公开(公告)日：1989-11-07

申请号：US791663

申请日：1985-10-28

Applicant: John C. Brock

Inventor： John C. Brock

IPC: G01J1/42 ,  G01J1/44 ,  G01J3/12 ,  H04B10/06

CPC classification number: H04B10/60 ,  G01J1/42 ,  G01J3/12 ,  G01J2001/4295 ,  G01J2001/442 ,  G01J2003/1252

Abstract: An optical filter and detector, and a related method for its operation, in which signal photons are admitted into a detector cell and selectively excite atoms or molecules of a vapor to a selected metastable state. An illuminating laser then photoionizes a large proportion of the excited atoms or molecules, and the resulting free electrons are collected as a measure of the number of incident signal photons. The initial excitation step to a metastable state is highly sensitive to the wavelength of the signal photons and therefore acts as a narrowband filter.

Abstract translation: 光学滤波器和检测器及其操作的相关方法，其中信号光子被允许进入检测器单元并选择性地将蒸气的原子或分子激发到选定的亚稳态。 然后照射激光使大部分激发的原子或分子光电离，并且将所得的自由电子作为入射信号光子的数量的度量进行收集。 到亚稳态的初始激发步骤对信号光子的波长高度敏感，因此用作窄带滤波器。