Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/4148
標題: 部分遮擋孔徑之短脈衝光譜壓縮現象探討
Study on the Spectral Compression of a Short Pulse through a Central-Obstructed Aperture
作者: 李忠憲
Li, Jhong-Sian
關鍵字: spectral compression;光譜壓縮;Central-obstructed aperture;Spectral switch;部分遮蔽孔徑;光開關
出版社: 精密工程學系所
引用: [1] E. Wolf, Phys. Rev Lett. 56, (1986) 1370. [2] E. Wolf, Nature 326, (1987) 363. [3] Z. Dacic, E. Wolf, J. Opt. Soc. Am. A 5 (1988) 1118. [4] C. Palma, G. Cincotti, Opt. Lett. A 157 (1991) 6. [5] F. Gori, G. Guattari, C. Padovani, Opt. Commun.367, (1988) 1. [6] H. C. Kandpal, J. S. Vaishya, K. C. Joshi, Opt.Commun.73, (1989)169 [7] J. Pu, H. Zhang, and S. Nemoto, ”Spectral shifts and spectral switches of partially coherent light passing through an aperture” Opt. Commun. 162, (1999) 57-63. [8] J. Pu, S. Nemoto, ”Spectral changes and 1 N spectral switches in the diffraction of partially coherent light by an aperture” J. Opt. Soc. Am. A 19, (2002) 339-344. [9] H. C. Kandpal, A. S. Vaishya, ”Experimental observation of the phenomenon of spectral switching for a class of partially coherent light, ”IEEE J. Quantum Electron.38, (2002) 336-339. [10] G. Gbur, T. D. Visser, and E. Wolf, ”Anomalous behavior of spectral near phase singularities of focused waves ”, Phys. Rev. Lett. 88, (2002) 013901. [11] P. Han, “Far-Field Spectral Intensity Characteristics of a Time- Dependent Gaussian Pulse from Two Types of Apodized Slits”, Japanese Journal of Applied Physics, 43 (6A) (2004) 3386-3393. [12] B. E. A. Salen and M. C. Teich, Fundamentals of Photonics, Wiley Interscience, P109~143, (1991). [13] J. W. Goodman, Introduction to Fourier Optic 2th, Mc Graw Hill, P63~P89、P151~P154, (2002). [14] E. Hecht, Optics 4th edition, Addsion Wesley, P444~513, (2002). [15] 張文忠,傅里葉分析-原理及題解-,中央圖書出版,P434~P441,(2001). [16] J. T. Foley, J. Opt. Soc. Am. A/Vol.19, No.12/December 2002.
摘要: 
近年來”孔徑色散”的現象引起了越來越多學者的注目,這個現象是因為孔徑繞射造成短脈衝光譜之改變,改變後的光譜產生藍位移或是紅位移的情形。
我們在近場的尺度下探討短脈衝光在部分孔徑遮擋效應下之現象,發現到遮擋的面積增加會減少軸上光譜開關之振盪週期;在遮擋的陰影面上存在著光譜壓縮現象;最後,遮擋面積與Fresnel number 存在著一個關係,當其二者乘積為一奇數,軸上光譜強度分布會有最大值產生;另一方面來說,當其二者乘積為一偶數,軸上光譜會有最小值產生。

Recently there is increasing interests in so called “aperture dispersion”, that is, the spectral changes of a short pulse resulting from the aperture diffraction. It also includes the red or blue shift of the spectrum maximum or the distortion of the incident pulse's spectrum.

With the Fresnel approximation, we investigate the spectral characteristics in the near zone when a short pulse is incident on a central-obstructed aperture. It is shown that, as the area of central obstruction increases, the period of on the axial spectral switches will increase. Also this spectral compression is found behind the shadow of the obstruction. Finally we get the relation between the area of the obstruction and Fresnel number. When the product of there two terms is odd, the maximum spectral intensity can be found. On the other hand, when it's is even, we get the minimum.
URI: http://hdl.handle.net/11455/4148
其他識別: U0005-2407200713522100
Appears in Collections:精密工程研究所

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