一种基于非扫描式F-P标准具的激光告警虚警抑制方法

为了降低激光告警系统的虚警率,提出了一种基于非扫描式F-P标准具结构的光学虚警抑制方法。该方法采用相干长度作为判据,因此可大大抑制背景辐射的干扰。通过计算机仿真验证了该方案的可行性。对该方案中的关键技术F-P标准具的设计进行了详细讨论,定性分析了F-P标准具结构参数对其工作性能的影响,并通过实验优选确定设计参数。结果表明,该方案结构简单,可有效排除非相干光的干扰,光学虚警率近乎为0,漏警率小于0.25%。     

用激光的强度比较式F-P空腔锁定技术进行微振动的测量

本文描述了一种微振动的激光测量方法。该方法利用F-P标准具的光学共振特性,借助于激光强度比较式F-P空腔锁定技术,在一般实验室条件下,实现了最小被测振幅可达10^-12cm数量级的微振动测量。 关键词：     

星载激光雷达F-P标准具高效温控算法的设计与实现

法布里-珀罗(F-P)标准具的研制是星载米散射激光雷达的关键技术节点之一。在分析温度对F-P标准具影响的前提下,结合常规PID温控算法和模糊算法原理,提出一种模糊算法与加入抗饱和参数的增量式PID算法相结合的高效温控算法,实现F-P标准具温度控制,将最终设定温度控制在±0.06 K范围内。该算法不仅实现简单,而且控制精度高,稳定性好,为星载米散射激光雷达窄带光学接收关键技术突破提供了保障。     

一种高稳定性光纤F-P标准具的设计

法布里-珀罗(F-P)标准具广泛应用于光纤通信与光纤传感领域。实心标准具受自身材料的限制,无法满足高稳定性的要求。空气隙标准具采用热膨胀系数极低的垫片,提高了器件的温度稳定性能。介绍了低温漂光纤F-P标准具的设计和制作,出射光自由光谱范围为100GHz,损耗为3dB,0~70℃温度漂移小于3GHz。相比于采用传统方法制作的标准具,该光纤F-P标准具稳定性更高,解决了实心标准具折射率和热膨胀变化大的问题。     

脉冲单纵模激光器中标准具精度与选模性能

根据脉冲单纵模激光器中的关键器件F-P标准具的选模原理,定量分析了不同参数F-P标准具的加工厚度精度、角度放置精度以及腔长变化对激光器纵模选择性能产生的影响,得到了对不同参数标准具的光学厚度偏差进行补偿所需的角度偏移量,研究了入射角度对标准具中心波长偏移的影响。这些结果对于脉冲单纵模激光器的机械结构设计、器件加工允差与装配调节精度的设计具有重要意义。在线型腔F-P标准具选模激光器中,得到了最大单脉冲能量8.41 J,脉冲宽度32 ns,近衍射极限的单纵模激光脉冲输出。     

塞曼效应实验中F．P标准具的快速调试

F-P标准具是塞曼效应实验仪器的核心元件,正确保养和调试非常重要。分析了F-P标准具的结构和成像原理,介绍了F-P标准具的快速调度方法。从而提高了仪器的使用寿命和师生动手操作等能力。     

一种基于F-P标准具的金属线膨胀系数测量方法

本论文提出一种基于F-P标准具的金属线膨胀系数测量方法.该方法利用光杠杆将金属棒受热膨胀时的伸长量转化为F-P标准具干涉光场中干涉条纹半径的变化,通过测量干涉条纹的间距便可实现对金属线膨胀系数的测量.由于该方法仅需测量F-P标准具干涉光场中外侧条纹的间距,并且F-P标准具的多光束等倾干涉可以产生锐利的干涉条纹,因此测量过程更加简便,实验结果的精确度更高.通过实验测量验证了该方法的可行性与可靠性.     

基于单法布里-珀罗标准具的双频率四边缘鉴频光电探测技术

提出了一种基于单固体法布里-珀罗(F-P)标准具和可调谐半导体激光器的高精度鉴频新技术双频率四边缘技术。导出了F-P标准具反射谱和透射谱函数表达式,分析了双频率四边缘技术的鉴频原理;根据鉴频原理,给出了鉴频系统结构及相应的探测信号分析处理方法;进一步分析了噪声引起的测量误差,导出了具体的误差公式;与传统的基于F-P标准具双边缘鉴频技术的探测性能做了对比分析。结果表明,该技术通过对F-P标准具的透射和反射信号同时探测,鉴频精度将提高2.82~3.03倍,而且由于采用的是单固体F-P标准具,光路简单且系统成本低。     

光纤空气隙法布里-珀罗标准具透射谱线型研究

空气隙法布里-珀罗(F-P)标准具是一种常见的光无源器件,其作为滤波器广泛应用于光通信、光电测量和光传感领域。根据经典干涉理论,F-P标准具的光谱为周期出现的洛伦兹峰。但在对F-P标准具透射谱的校准与拟合过程中,发现其透射峰存在左右不对称以及展宽现象,导致使用经典洛伦兹公式的拟合误差较大。通过分析透射峰不对称度和展宽间的关系,并考虑光纤准直器的发散角以及F-P标准具的装配误差因素,提出了一种基于传统F-P干涉理论并融合发散角与入射偏角的多峰叠加拟合公式。使F-P透射谱的拟合方差提高到0.008、重合精度为0.9998,与基于洛伦兹线型的拟合结果相比提高了近15倍。该研究提供了一种对光纤空气隙F-P标准具透射谱精确拟合的方法,并对其设计以及装配工艺有着重要的指导意义。     

基于复合波长参考的温度稳定光纤光栅传感解调研究

为实现温度稳定的光纤光栅传感解调,提出了综合使用法布里-珀罗(F-P)标准具和乙炔气室进行实时复合波长参考的校正方法。分析了F-P标准具透射光谱和乙炔气室吸收光谱的温度漂移特性。建立实验系统,测试了F-P标准具透射光谱的温度漂移特性,实验显示F-P标准具谱线平均温度灵敏度为1.16 pm/℃,谱线温度重复性误差可达13.0 pm。进行了基于F-P标准具单独参考和基于复合波长参考的解调温度稳定性实验,实验结果表明0℃~55℃的高低温循环,基于F-P标准具单独参考的解调值变化范围为±32.7 pm,标准差为20.7 pm,基于复合波长参考的解调值变化范围为±1.2 pm,标准差为0.39 pm,解调值变化范围温度稳定性提高了27倍。     

On some properties of the Fabry-Perot etalon with negative permittivities of the medium

Specific features of the Fabry-Perot etalon with negative permittivities of the medium are analyzed. Inhomogeneous waves may exhibit, after passing through such an etalon, a giant amplitude enhancement. They remain inhomogeneous and do not transfer the field energy. Due to absorption and other losses, there may arise, in the inhomogeneous wave, running components and interference effects. The etalon cannot improve the diffraction-limited resolving power of the optical devices detecting traveling waves. The possibilities of application of the etalon in the near-field optics are noted. The giant enhancement of the inhomogeneous wave amplitude occurs due to resonance of the incident wave with eigen (surface) waves of the input and output planes of the etalon. It is shown that, with respect to inhomogeneous waves, the Fabry-Perot etalon with negative permittivities is a narrow-band filter with the peak transmission for the spatial frequency of the Fourier expansion of the boundary values on the order of the inverse wavelength. Under the resonance conditions, the running components, when passing through the etalon, experience aberrational distortions. Polarization properties of the resonance amplification are clarified.     

The interaction between single-mode laser radiation and sodium vapour in a Fabry-Perot etalon and a ring optical cavity

The observation of optical bistability in the D lines of sodium vapour contained in both a Fabry-Perot etalon and a ring cavity is reported. As well, an enhanced transmission feature which appears under appropriate conditions in the Fabry-Perot etalon only is presented. This feature is interpreted in terms of a non-absorption resonance in an inverted V three-level model of the sodium D transitions.     

A semiconductor-based, frequency-stabilized mode-locked laser using a phase modulator and an intracavity etalon

We report a frequency-stabilized semiconductor-based mode-locked laser that uses a phase modulator and an intracavity Fabry-Perot etalon for both active mode-locking and optical frequency stabilization. A twofold multiplication of the repetition frequency of the laser is inherently obtained in the process. The residual timing jitter of the mode-locked pulse train is 13 fs (1 Hz to 100 MHz), measured after regenerative frequency division of the photodetected pulse train.     

Thermal characteristics of a fiber Fabry-Perot etalon made of highly birefringent fiber

Fiber Fabry-Perot etalon (FFPE) is a device designed as an optical frequency filter, and its transmission characteristics change depending on temperature. The temperature dependence of the transmission frequency of an FFPE made of a highly birefringent fiber was found to be −2:31 GHz/deg, which is almost the same as that of a conventional etalon. On the contrary, its temperature dependence of the transmission frequency separation due to birefringence was found to be −140 MHz/deg. This is about 18 times larger than that for a conventional FFPE, and it implies that an FFPE made of highly birefringent fiber is promising as a temperature sensor with a high precision.     

Generation of 40 GHz and 60 GHz Optical Pulses by Repetition Rate Multiplying with Comb-like Filter

The comb-like filter characteristic of a Fabry-Perot etalon in frequency domain was deployed to filter out the discrete spectral lines of injected 10GHz optical pulse train. By changing the free spectral range and obtaining the spectral components spaced to 4 and 6 times of the repetition rate, the pulse trains with 40 GHz and 60 GHz were successfully obtained.     

In-line fiber-optic etalon formed by hollow-core photonic crystal fiber

A novel fiber-optic in-line etalon formed by splicing a section of hollow-core photonic crystal fiber (HCPCF) in between two single-mode fibers is proposed and demonstrated, for the first time to our knowledge. Such a HCPCF-based etalon acts as an excellent optical waveguide to form a Fabry-Perot interferometer and hence allows the cavity length to be as long as several centimeters with good visibility as the transmission loss of the HCPCF is much smaller than that of a hollow core fiber; this offers great potential to generate a practical dense fiber-optic sensor network with spatial frequency division-multiplexing. This novel etalon is demonstrated for strain measurement, and the experimental results show that a good visibility of 0.3 and a strain accuracy of better than +/- 5 microepsilon are achieved.     

Cavity optimization of optical bistable semiconductor etalon in transmission operation mode

Semiconductor nonlinear Fabry-Perot etalon design is considered. A method of determination of cavity parameters simultaneously satisfying the requirements: low critical switching intensity, high output signal and high contrast between two stable state, is proposed. The results obtained may be used for construction of optical bistable elements in the transmission operation mode.