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Laser Technology

The characteristics of Stark tuned Faraday anomalous dispersion optical filter at 459nm

Yufeng Peng

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

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.

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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.
Abstract A narrow linewidth Faraday anomalous dispersion optical filter (FADOF) with reflection configuration is achieved for the first time based on the cesium (Cs) ground state 6S1/2 to the excited state 6P3/2 transition at 852 nm. Compared with the conventional FADOF with transmission configuration, reflection-type FADOF can greatly improve the transmittance of optical filter under the same experimental parameters, because it allows signal light to go and return through the atomic vapor cell. In our experiment, peak transmittance at Cs 6S1/2 F = 4–6P3/2 transition is 81% for the reflection-type FADOF, and while 54% for the transmission-type FADOF when the temperature of Cs vapor cell and the axial magnetic field are 60 °C and 19 G. The idea of this reflection-type FADOF design has the potential to be applied to the FADOF operating between two excited states to obtain higher transmittance.
A 459 nm Faraday anomalous dispersion optical filter (FADOF) working at the side wings of the cesium 6S1/2→7P1/2 transition with weak oscillator strength is achieved. The transmittance of the higher side wing reaches 98% at a temperature of 179°C and magnetic field above 323 G. The experimental results coincide with the theoretical predictions in 1982 and 1995, which were not realized in experiments for over three decades. Due to its high transmittance, high accuracy, and narrow linewidth, the 459 nm FADOF can be applied in underwater optical communications, the building of active optical clocks, and laser frequency stabilization in active optical clocks.
The use of Faraday anomalous dispersion optical filtering in edge filters was proposed,which can cover the shortages of edge filters in using resonant transitions in the ~(127)I_2 and ~(129)I_2 molecules. The characteristics of filtering and frequency tuning of Faraday anomalous dispersion spectrum of Cs 6S_(1/2)7P_(1/2) transition were analyzed theoretically.The results show that there are two steep transmission peaks in line-wing symmetrically in the Faraday anomalous dispersion spectrum of Cs atoms,by adjusting the temperature of atomic vapor cell and the external magnetic field strength,the central frequencies of the transmission peaks in line-wing can be tuned to the desired locations.
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.
To obtain the weak signal light detection from the high background noise,a study on ultra-narrow bandwidth Faraday anomalous dispersion optical filter(FADOF) at the 87Rb D1 line,5S1/2F=2→5P1/2 F′=1transmission(795 nm) is demonstrated experimentally.A sample cell filled with Rubidium atoms in which the proportion of 87Rb is greater than that of the nature rubidium is placed in a homogeneous magnetic field between two crossed Glan-Thompson polarizers.The incident probe light goes through the sample cell,and interacts with the atoms.Because of the Faraday rotation,the function of the filter can be realized.When the experiment condition changed,the result of transmission spectrum changed accordingly.With the temperature rising from 340 K to 360 K,the variation of the transmission spectrum is recorded particularly.And the reason for the variation is analyzed carefully.At a proper temperature and magnetic field,a transmission spectrum narrowed to ~220 MHz is obtained,and the peak transmission is about 48%.The performance of the87Rb D1 line is better than that of the 85Rb.
SummaryWe achieve the stabilization of the laser power using a cesium Faraday anomalous dispersion optical filter (FADOF). We measured the transmission spectrum of the FADOF. In the transition line of 6s2S1/2F=4→6p2P3/2for cesium at the wavelength of 852 nm, when the laser frequency is constant, the transmission of FADOF increases rapidly and then decreases as the probe laser intensity increases. The negative correlation between FADOF transmission and laser intensity can be used to stabilize the laser power. Therefore, we tune the laser frequency to the cesium 6s2S1/2F=4→6p2P3/2transition line, then the power of the laser passing through the FADOF is expected to be stabilized. This work can be applied to the precision measurement field, such as atomic clocks, atomic gravimeters, atomic magnetometers, etc.