采用原子滤光器的新型激光信标方案研究

提出了采用法拉第反常色散滤光器（ＦＡＤＯＦ）的光电双反馈激光信标新方案。该方案通过数字控制系统和光反馈系统的共同作用，使激光信标系统的稳定性、抗干扰性和可靠性大大提高，并实现了上电自动工作。这种新型激光信标的频率稳定度优于５×１０－９，在３０ｍｓ内可将半导体激光频率稳定在法拉第反常色散滤光器任一透射峰上。该方案可与采用法拉第反常色散滤光器的新型跟瞄系统匹配使用，对建立卫星激光通信链路有重要意义。     

原子滤光器多峰及可调谐特性在卫星光链路捕捉系统中应用探讨

从轨道方程出发，对影响卫星光链路接收机带宽的主要因素－－多普勒频移进行了研究。在对法拉第反常色散滤光器（FADOF）透射及调谐特性进行理论和实验研究的基础上，提出利用法拉第反常色散滤光器的多峰及可调谐特性的多种新方案来适应不同轨道捕捉点的需要。滤光器带宽典型数据为0.01nm-0.02nm。     

双透射峰钠原子滤光器在太阳速度场观测中的应用

法拉第反常色散原子滤光器作为一种精密光谱仪器,具有光谱分辨力高、光谱稳定性好等优点。探讨了利用双透射峰钠原子滤光器进行高分辨力太阳多普勒观测的方法,在此基础之上开发了原子滤光器透射谱型理论模拟软件,研制出双透射峰钠原子滤光器样机并对其进行了透射谱型测试。测试结果表明,理论模拟的透射谱型与实验测试结果符合良好,在双峰间距、透射带宽等参数方面基本满足太阳多普勒观测的要求,为太阳观测提供另一种有效手段。     

佛克脱反常色散原子滤光器工作机理研究

对佛克脱（Voigt)型反常色散原子滤光器的工作机理和各种性能进行讨论,该种滤光器的实现研究表明理论与实验结果符合得好。滤光器在外加磁场为0．02T、汽室温度为110℃的单峰带宽为0．8GHz,比相同条件下的法拉第型反常色散原子滤光器小0．5Hz,并且工程化实现比法拉第型反常色散原子滤光器容易。佛克脱型反常色散原子滤光器在卫星光通信领域有潜在的极大应用前景。     

中间场下铷532 nm法拉第滤光器传输特性分析

对工作在铷5P1/2→10S1/2(532 nm)跃迁的法拉第反常色散滤光器的传输特性,并对中间场下激发态法拉第反常色散滤光器的理论模型进行了分析与讨论.依据量子力学微扰理论和量子跃迁理论,给予了完整地描述.理论分析结果表明,在气室温度434 K,磁场强度0.067 T,抽运光强度20 W/m2,气室长度0.1 m条件下,法拉第反常色散滤光器处于一个最佳工作状态;期望的线芯工作方式得以实现.中心透射峰适宜作滤光器的信号光通道.理论模型预测滤光器的峰值透过率接近50%,等效带宽仅为2.6 GHz.铷532 nm激发态法拉第反常色散滤光器的光谱特性可用于检测具有重要应用价值的二倍频Nd:YAG激光信号.     

422.7nm法拉第反常色散滤光特性

对工作在第ｇ条夫朗和费暗线（４２２．６７４ｎｍ）的法拉第反常色散滤光器的滤光特性进行了理论分析和讨论。     

脉冲光信号的Cs原子455nm两级法拉第反常色散滤光器特性实？…

本文实验研究了脉冲光信号的Ｃｓ原子４５５ｎｍ两级法拉第反常色散滤光器的一些重要特性。     

法拉第原子滤光器的特性及应用

以我们对铯原子法拉第反常色散原了滤光器(FADOF)的研究为基础，结合其它FADOF的研究成果．介绍了FADOF的原理、特性、以及在滤波、鉴频、磁光调制等方面的应用。     

459nm可调谐法拉第反常色散滤光特性

本文考虑到铯原子６Ｓ１／２→７Ｐ１／２跃迁谱线（４５９ｎｍ）的超精细结构，对铯原子气体的法拉第反应色散滤光器的透过率，中心频率调谐特性，通频带宽与外加纵向磁场强度，原子汽室温度的关系进行了理论分析。     

采用级联原子滤光器的新型卫星激光链路系统研究

提出级联佛克脱型原子滤光器(Linked VADOF)的新构想。从理论上分析并计算了级联佛克脱型原子滤光器的透射谱。结果表明，级联佛克脱型原子滤光器将佛克脱型原子滤光器的多峰改造为单峰结构，具有比佛克脱型原子滤光器更窄的线宽和更高的噪声抑制比。将这种新型结构应用于激光信标锁频。该锁频方案提高了信标光频率的稳定性。在此基础上，给出了发射端采用级联佛克脱型原子滤光器锁频，接收端采用法拉第型原子滤光器(FADOF)滤光的新型卫星激光链路系统。外场初步联调实验表明了该系统的可行性。     

Cs Faraday anomalous dispersion optical filter for blue pulsed laser

ＣｓＦａｒａｄａｙａｎｏｍａｌｏｕｓｄｉｓｐｅｒｓｉｏｎｏｐｔｉｃａｌｆｉｌｔｅｒｆｏｒｂｌｕｅｐｕｌｓｅｄｌａｓｅｒＺＨＡＮＧＬｉａｎｇ；ＬｉＹｉｍｉｎ；ＴＡＮＧＪｕｎｘｉｏｎｇ；ＷＡＮＧＱｉｎｇｊｉ（Ｄｅｐｔ．ｏｆＲａｄｉｏ－Ｅｌｅｃｔｒｏｎｉｃ...     

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

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 6S_1/2 to the excited state 6P_3/2 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 6S_1/2 F=4-6P_3/2 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℃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.     

实现半导体激光器频率跟踪和锁定的新方法

本文报道实现半导体激光器连续频率跟踪和锁定的一种新方法:利用法拉第反常色散光学滤波器(FADOF)的透射谱作鉴频器,改变法拉第反常色散光学滤波器的磁场强度,实现频率跟踪和稳频.实验得到,当磁场从0.7×10~(-2)T变到2.2×10~(-2)T时,半导体激光器在～2GHz范围内跟踪锁定,其频率稳定度优于2.1×10~(-10)(100ms≤τ≤10s).     

Ultra-narrow bandwidth optical filters consisting of one-dimensional photonic crystals with anomalous dispersion materials

We present a new type of optical filter with an ultra-narrow bandwidth and a wide field-of-view （FOV）. This kind of optical filter consists of one-dimensional photonic crystal （PC） incorporating an anomalous-dispersion-material （ADM） with, for instance, an anomalous dispersion of 6P3/2←6S1/2 hyperfine structure transition of a caesium atom. The transmission spectra of optical filters are calculated by using the transfer-matrix method. The simulation results show that the designed optical filter has a bandwidth narrower than 0.33GHz and a wide FOV of ±30°as well. The response of transmission spectrum to an external magnetic field is also investigated.     

A Doppler lidar with atomic Faraday devices frequency stabilization and discrimination

In this paper, we report a Doppler lidar in which the laser frequency is stabilized and the backscattered light frequency is discriminated by a multi-peak and a less-peak atomic Faraday anomalous dispersion optical filter (FADOF), respectively. The transmission spectrum of the FADOF is stable as it is based on an atomic transition, and slightly tunable with a magnet due to Zeeman effect. The high frequency stability of the FADOF provides a high velocity accuracy; and the tunability of the FADOF transmission spectrum makes the measurement range flexible. We describe an experimental lidar system based on cesium FADOFs, and the experimental error is of±0.74 m/s over velocities ranging from ?40 to +40 m/s.     

The filtering characteristics of potassium Faraday anomalous dispersion optical filter in a strong magnetic field

This paper discusses in detail the effect of magnetic field on the filtering behaviour of potassium D₂ line Faraday anomalous dispersion optical filter (FADOF) when the working temperature and the length of the cell are fixed. The transmission spectra were measured in different magnetic fields and line-centre operation transmission spectrum was obtained under the predicted optimal working condition.     

Faraday anomalous dispersion optical filter with a single transmission peak using a buffer-gas-filled rubidium cell

A Faraday anomalous dispersion optical filter (FADOF) with a single transmission peak is achieved by using a buffer-gas (argon, 2 Torr)-filled rubidium cell. At room temperature, the transmission is 0.2% and the bandwidth of the transmission peak is 0.65 GHz. At a temperature of 63° C, the transmission rises to a maximum of 30.6%, with a bandwidth of 1.41 GHz. This FADOF may replace the use of interference filters or virtually imaged phased arrays in imaging modalities.