浸入式光栅谱线特性（英文）

发布时间：2019-01-01 09:38

【摘要】：浸入式光栅常应用于光学材料折射率较高的红外谱段.其特殊的工作模式会产生一系列普通反射式光栅不需面临的问题,而它们对于浸入式光栅的应用却十分重要.论文推导了普通光栅长波端与短波端谱线长度的关系.针对折射率与波长相关的特点,以短波红外(1.5~2.5μm)为例,分析其谱线位置分布及光谱分辨率变化特性.结果表明,浸入式光栅谱线分布相较于普通光栅有明显差异,"梯形"谱线会发生倾斜.在折射率变化较大的短波红外谱段,"梯形"谱线倾斜程度较明显.在以长波(2.5μm)配准Littrow条件时,谱线向短波端倾斜,以短波(1.5μm)配准时向长波端倾斜,且Littrow波长均漂离中心波长.由于折射率在热红外谱段变化较小,"梯形"谱线倾斜较小,更接近普通光栅情况.浸入式光栅的光谱分辨率随折射率变化而改变,同级中,波长增大分辨率增大;各级间,级数减小分辨率减小.同时,由于高级次(短波)分辨率大于低级次(长波),因此各级谱线长度之比不再满足普通光栅中的比例关系.
[Abstract]:Immersion gratings are often used in infrared spectrum with high refractive index of optical materials. Its special mode of operation will result in a series of problems that ordinary reflective gratings do not have to face, but they are very important for the application of immersion gratings. The relationship between the length of the long wave end and the short wave end of the grating is deduced in this paper. According to the characteristics of refractive index and wavelength correlation, the spectral line location distribution and spectral resolution change characteristics of HF infrared (1.5 渭 m 2.5 渭 m) are analyzed. The results show that the spectral line distribution of the immersed grating is obviously different from that of the ordinary grating, and the "trapezoid" line will be inclined. The gradient of "trapezoid" spectral line is obvious in the short wave infrared spectrum where the refractive index varies greatly. When the Littrow condition is registered with long wave (2.5 渭 m), the spectral line is inclined to the short wave end, and the short wave (1.5 渭 m) is punctually inclined to the long wave end, and the Littrow wavelength is drifted away from the center wavelength. Because the refractive index varies little in the thermal infrared spectrum, the "trapezoid" spectral line tilts less, which is closer to the case of common grating. The spectral resolution of immersion grating varies with the change of refractive index. In the same order, the resolution of wavelength increases and the resolution of series decreases. At the same time, because the resolution of high order (short wave) is higher than that of low order (long wave), the ratio of line length of each level is no longer satisfied with the proportion relation in ordinary grating.
【作者单位】：西安电子科技大学物理与光电工程学院;中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室;深圳大学光电子器件与系统教育部/广东省重点实验室;中国科学院西安光学精密机械研究所空间光学应用研究室;
【基金】：Supported by the National Natural Science Foundation of China(61501361) State Key Laboratory of Transient Optics and Photonics,Chinese Academy of Sciences(SKLST201509) Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province(GD201712) Open Research Fund of Key Laboratory of Spectral Imaging Technology,Chinese Academy of Sciences(LSIT201506) the Fundamental Research Funds for the Central Universities(JB160509)
【分类号】：TN25

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