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Design and fabrication of broadband rugate filter

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【Author】 Zhang Jun-Chao a)b),Fang Ming a),Shao Yu-Chuan a)b),Jin Yun-Xia a),and He Hong-Bo a) a) Key Laboratory of Material Science and Technology for High Power Lasers,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China b) Optic and Laser Division,National Institute of Metrology,Beijing 100013,China

【机构】 Key Laboratory of Material Science and Technology for High Power Lasers,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences； Optic and Laser Division,National Institute of Metrology；

【摘要】 The design and the deposition of a rugate filter for broadband applications are discussed.The bandwidth is extended by increasing the rugate period continuously with depth.The width and the smoothness of the reflection band with the distribution of the periods are investigated.The improvement of the steepness of the stopband edges and the suppression of the side lobes in the transmission zone are realized by adding two apodized rugate structures with fixed periods at the external broadband rugate filter interfaces.The rapidly alternating deposition technology is used to fabricate a rugate filter sample.The measured transmission spectrum with a reflection bandwidth of approximately 505 nm is close to that of the designed broadband rugate filter except a transmittance peak in the stopband.Based on the analysis of the cross-sectional scanning electron microscopic image of the sample,it is found that the transmission peak is most likely to be caused by the instability of the deposition rate.更多还原

【Abstract】 The design and the deposition of a rugate filter for broadband applications are discussed.The bandwidth is extended by increasing the rugate period continuously with depth.The width and the smoothness of the reflection band with the distribution of the periods are investigated.The improvement of the steepness of the stopband edges and the suppression of the side lobes in the transmission zone are realized by adding two apodized rugate structures with fixed periods at the external broadband rugate filter interfaces.The rapidly alternating deposition technology is used to fabricate a rugate filter sample.The measured transmission spectrum with a reflection bandwidth of approximately 505 nm is close to that of the designed broadband rugate filter except a transmittance peak in the stopband.Based on the analysis of the cross-sectional scanning electron microscopic image of the sample,it is found that the transmission peak is most likely to be caused by the instability of the deposition rate.更多还原

【关键词】 rugate filter； broadband； rapidly alternating deposition；
【Key words】 rugate filter； broadband； rapidly alternating deposition；

【基金】 Project supported by the National Natural Science Foundation of China (Grant No. 10704079);the NSAF Joint Fund,China(Grant No. 10976030)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2012年05期

【分类号】TN713
【被引频次】3
【下载频次】43

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