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文中提出了两种利用放大原理测量全息光栅光栅常数的简单方法:扩束镜放大成像法和凸透镜放大成像法。采用这两种方法可以直接看到全息光栅的放大像,适于全息光栅结构的实验演示以及所制全息光栅质量的检查。同时这两种方法测量光栅常数具有简单、直观、准确、易于操作等优点,适合测量光栅常数大于1微米的全息光栅,并且光栅常数越大测量越精确,弥补了衍射法适于测量小光栅常数的不足。 相似文献
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本文叙述了全息光栅的制造原理、工艺要求和制造技术。介绍了平场全息光栅、图象全息光栅、超环面全息光栅、激光全患光栅和闪耀全息光栅的新进展。最后,作者提出进一步发展全息光栅的若干建议。 相似文献
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利用4f傅里叶交换系统,通过频谱面滤波手段,将圆盘玻璃振幅型径向光栅复制成全息式相位径向光栅.所复制的相位光栅具有新的频谱信息.另外,还可得到倍频光栅,理论分析和实验结果相符合. 相似文献
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本文报道一种利用洛埃镜原理制造全息光栅的新装置及其调整方法.该装置具有光学系统简单,干涉条纹定位精度高和调整方便等优点,可制造性能良好的全息光栅. 相似文献
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光谱仪用平场凹面光栅的凸面母光栅的消像差设计思路 总被引:2,自引:0,他引:2
平场全息凹面光栅是光谱仪中的核心元件之一,其成像质量和衍射效率直接影响了光谱仪的分辨率和光能利用率.利用凸面母光栅复制制作凹面光栅,便于在凸面基底上进行离子束刻蚀以获得高的衍射效率.为了保证复制的凹面光栅具有高的成像质量,文章提出一种全息凸面光刻胶光栅的消像差设计方法,优化中考虑了凸面基底对记录光束的折射效应以及由基底折射率所引入的附加光程.通过将"光程函数级数展开法"和ZEMAX光学没计软件相结合,采用粗精两步优化的方法,显著提高了优化的效率和成功率.ZEMAX对比仿真结果显示,复制得到的凹面光栅与传统直接采用全息法制作的凹面光栅的成像质量是相当的. 相似文献
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高质量全息光栅实验系统研究 总被引:2,自引:1,他引:1
基于全息光栅在信息光学及光谱仪中的重要地位,对全息光栅进行了理论分析,提出了一种新的制作高质量全息光栅的实验系统.该实验系统的优点在于:将激光器发出的高斯光束改造成为均匀平面光波,以此平面光波作为光源可以制作出高质量的全息光栅. 相似文献
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This paper explores the feasible use of circular optical grating for measuring the rotation of mirrors that are commonly found in micro-systems. Both theoretical and experimental results show that distortion of the circular grating that is projected onto the mirror surface is a simple function of the angular rotation of the mirror. The circular grating may readily be generated using a standard Michelson interferometer or an LCD projector. Through manipulating the distance between the interferometer and the mirror surface, the diameter of the optical grating may be varied. Furthermore, the additional use of a converging lens enables a significant reduction in the size of the grating: with simple laboratory facility, small circular grating of about 400 μm is achieved for use on micro-systems. With the use of more sophisticated optical elements, the angular rotation of even smaller micro-mirrors may be measured. 相似文献
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报道了对BaTiO3晶体中体全息栅的热定影过程的研究结果,对BaTiO3晶体中离子补偿栅形成的临界温度,离子栅的形成与衍射光振荡间的关系,离子栅的形成速度与温度的关系,降温方式对热定影效率的影响进行了仔细的研究,并实现了高效率的热定影,发现了高温擦除过程的有趣现象,并对实验结果进行了分析。 相似文献
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Jianliang Yang Yunqi Liu Sweechuan Tjin Jianping Yao 《International Journal of Infrared and Millimeter Waves》2002,23(8):1241-1250
A photonics true-time-delay system for phased array antenna beam steering employing a novel tunable chirped fiber grating delay line and a multi-wavelength erbium-doped fiber ring laser source based on a sampled grating filter is proposed. The tunable chirped fiber grating, which act as a continuous time-delay element, is achieved by bending a uniform fiber Bragg grating bonded at a slant onto the lateral surface of a simply supported beam. This technique allows the dynamic control of the chirp rate and spectral width of the grating without center wavelength shift. By adjusting the chirp rate of the fiber grating via bend strain, this kind of tunable chirped fiber grating could achieve very low and adjustable delay times, therefore provides higher angle resolution for scanning microwave beam, even the wavelengths of laser source are fixed and un-tunable. The true-time-delay system using proposed tunable chirped fiber grating delay element and sampled grating based laser source is constructed and demonstrated experimentally. 相似文献
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Zongqiang Lin Xiangfei Chen Fei Wu Jinshan Shi Yuzhe Yin Shizhong Xie 《Optics & Laser Technology》2003,35(4):315-318
In this paper, a new implementation of the double exposure method for fabricating apodized fiber Bragg gratings by controlling the parameters of rotation stage and the number of UV-shots is presented. As a result, the average refractive index is kept nearly constant along the Bragg grating, and various apodized fiber Bragg grating with high reflectivity and high side lobe suppression ratio have been fabricated in single-mode hydrogen-loaded photosensitive fiber . The achieved side-lobe suppression ratio is larger than 25 dB. 相似文献
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Guo-Dong Wang 《Optik》2006,117(10):477-480
A new grating structure of cladding being etched as hyperbolic function along the grating length is introduced to improve their performance. The fiber grating exhibits a flattop spectrum with steep edges and high reflectivity when tension is applied to it. The bandwidth utilization defined as the ratio of −1:−30 could be achieved a larger value (>0.9689). The −3 dB bandwidth and the bandwidth utilization could be tunable with the increment of tension applied to the grating and the etch factor. 相似文献
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研究了基于半导体光放大器(SOA)和双段级联取样光纤光栅构成的新型结构多波长激光器.设 计了取样光纤光栅,计算了其反射谱,模拟了多波长激光器的输出光谱.基于自行制作的SOA 和取样光纤光栅,进行了多波长激光器的实验研究,得到了间隔为0.8nm、输出功率不平坦 度小于1.0dB的11个波长输出.理论和实验两个方面都可以验证:与基于普通取样光栅的多波 长方案相比,基于双段级联取样光栅的方案能改善输出谱平坦度,并可提高可激射波长数.
关键词:
半导体光放大器
取样光纤光栅
多波长激光器 相似文献
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Improving the performance of chirped fiber grating with cladding being etched as sinusoidal function
A new grating structure of cladding being etched as sinusoidal function along the grating length is introduced to improve their performance. When a tension is applied to it, the fiber grating not only exhibits a flattop spectrum with steep edges and high reflectivity, but also has a smoothly time delay curve. The bandwidth utilization defined as the ratio of −1:−30 could be achieved a larger value (>0.90). The −3 dB bandwidth and the bandwidth utilization could be tunable with the increment of tension applied to the grating and the linearly chirped modulus. 相似文献