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Journal of Modern Optics

A study of the potassium excited state Stark anomalous dispersion optical filter at 532.33 nm

Xiaoling Jia, Guochun Wan, Zhongyi Wang

Published Apr 17, 2009• 3 citations
Publisher

Abstract

The potassium tunable excited state Stark anomalous dispersion optical filter (SADOF) at 532.33 nm was studied theoretically and experimentally. The theoretical model of SADOF was deduced and the transmission of SADOF was calculated. The transmission spectra of potassium SADOF in different electric fields were measured and the experimental frequency shifts of SADOF versus the strengths of the electric field were given. Furthermore, the comparison between the experimental results with the corresponding theoretically simulated results has been completed. The comparison shows that our experimental results agree with the theoretically simulated results in general.

DOI
10.1080/09500340902843032

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The potassium tunable excited state Stark anomalous dispersion optical filter (SADOF) at 532.33 nm was studied theoretically and experimentally. The theoretical model of SADOF was deduced and the transmission of SADOF was calculated. The transmission spectra of potassium SADOF in different electric fields were measured and the experimental frequency shifts of SADOF versus the strengths of the electric field were given. Furthermore, the comparison between the experimental results with the corresponding theoretically simulated results has been completed. The comparison shows that our experimental results agree with the theoretically simulated results in general.
A Stark anomalous dispersion optical filter (SADOF) is an ultra-narrow bandwidth optical filter for applications in laser remote sensing and satellite laser communications. A SADOF consists of an atomic vapor cell between crossed polarizers subject to a dc electrical field transverse to the optical path and oriented 45° relative to the crossed polarizers. When linearly polarized light travels through a rubidium atomic vapor cell, a polarization rotation occurs (Stark induced birefringence). Large rotation angles may be obtained when the input light frequency is near the resonant frequencies of the atomic vapor. The transmission peaks of the SADOF correspond to frequencies that have rotation angles of odd integer multiples of π/2 and low absorption in the vapor cell. The transmission curve depends on the electric field and atomic density, and the optimum conditions for a rubidium SADOF are found through theoretical calculations that include both Stark spectral and polarization rotation. We will present theoretical SADOF transmission curves for several green rubidium transition frequencies.
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.
The characteristics of cesium Stark tuned Faraday anomalous dispersion optical filter(S-FADOF) at 459nm are theoretically analyzed.The transmission spectrum of cesium S-FADOF at 459nm is calculated,then compared with that of cesium FADOF at 459nm in the same condition.The influence of different magnetic strength and temperature on the transmission spectrum of cesium S-FADOF at 459nm is analyzed.The calculated curve of the central frequency shift of the transmission spectrum of cesium S-FADOF at 459nm as a function of electric field is also given.The results show that external electric field doesn't change the structure of transmission spectrum and only causes the central frequency shift which increases with the enhancement of the electric field.
An ultra-narrow bandwidth potassium Faraday anomalous dispersion optical filter (FADOF) at the D/sub 2/ line is studied theoretically and experimentally. The effect of temperature on the characteristics of the potassium Faraday filter is discussed and the transmission versus temperature is given. Our research results show that the transmission of the K-FADOF reaches nearly 90% with a bandwidth of only 1.5 GHz. To meet different requirements, K-FADOF can operate at line-center or in the line-wing by changing the working parameters.
The characteristics of a potassium Faraday anomalous dispersion optical filter operating on the blue and near infrared transitions are calculated. The results show that the filter can be designed to provide high transmission, very narrow pass bandwidth, and low equivalent noise bandwidth. The Faraday anomalous dispersion optical filter (FADOF) provides a narrow pass bandwidth (about GHz) optical filter for laser communications, remote sensing, and lidar. The general theoretical model for the FADOF has been established in our previous paper. In this paper, we have identified the optimum operational conditions for a potassium FADOF operating on the blue and infrared transitions. The signal transmission, bandwidth, and equivalent noise bandwidth (ENBW) are also calculated.
In this paper the calculations for a K Faraday filter at 532.33 nm that can be used to detect the practical and important frequency-doubled Nd:YAG laser are presented and discussed. Our model predicts a peak transmission of 50% and an equivalent bandwidth of 4 GHz for the filter operating on the transition in potassium. 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 required range from 0.8 to .