熱膨脹對體積全像的影響

本篇論文主要是採用相位疊加法(VOHIL,英文全名稱為Volume Hologram being an Interference of the Lights emitted from elementary Light Sources) 來模擬並分析溫度對反射式體積全像的影響。模擬的方法是利用兩道平面光建構完成的反射式光柵在溫度均勻變化時，以及非均勻變化時，探討其所造成繞射光強度和波長的改變。同樣亦應用於二維的情況，已建構好的光柵之體積全像(其大小為4mm×4mm)，針對隨溫度均勻分布和梯度分佈兩種不同變化時，在不同觀察距離探討分析所呈現的繞射光干涉圖形，以及繞射光波長的變化。另外，再次用此法於三維立方體積全像(其大小為4mm×4mm×4mm)，探討分析所呈現繞射光干涉圖形隨著定點加熱，定直線加熱的變化，並與實驗所得到的結果作一詳細之比較。最終的結論，發現模擬分析的圖形與實驗操作真正所得到的結果具有高度的吻合性，由此可證實利用相位疊加法來模擬分析溫度對體積全像的影響，不僅是一種既簡單又方便，更具高效率的方法。

關鍵字

熱膨脹；相位疊加法；體積全像

並列摘要

In this thesis, a useful and effective model is so-called VOHIL (Volume Hologram being an Interference of the Light emitted from elementary light sources) for simulating and analyzing on influence by thermal expansion in volume hologram grating is presented and discussed. The simulating method is taking two plane waves to construct completely a reflected volume hologram grating, which was considered as the main material performed under both conditions of uniform and gradient thermal variational distribution. And to investigate these above mentioned factors arise affected on the relatively diffracted intensities and wavelengths of volume hologram grating. The same method and procedure can also be applied in two-dimensional case, with a volume hologram grating (its size is 4mm×4mm) fulfilled at various observation distances. In addition, follow the same procedure again to three-dimensional case, with a cubic volume hologram grating (its size extended to 4mm×4mm×4mm) but set a fixed heating point and heating line respectively. Finally, the simulated result obtained here has been compared with that obtained experimentally in an excellent agreement to each other. Therefore, it is an evidence that the VOHIL model is a simplify and powerful method in predicting the relative diffracted efficiency and wavelength of volume hologram grating under specified thermal condition.

並列關鍵字

volume hologram ； thermal expansion ； VOHIL

參考文獻

[1] D. Gabor, ”A new Microscopic principle,” Nature 161,777(1948).

[2] P. J. van Heerden, “Theory of optical information storage in solids,” Appl. Opt. 2, 393 (1963).

[4] C. C. Sun, W.C. Su, B. Wong, and Y.O. Yang, “Diffraction selectivity of holograms with random phase encoding.” Opt. Commum, 175, 67 (2000).

[5] C. C. Sun, W.C. Su, ”Three-dimensional shifting selectivity of random phase encoding in volume holograms.” Appl. Opt. 40, 1253 (2001).

[6] C. C. Sun, ”Simplified model for diffraction analysis of volume holograms,” Opt. Eng. 42(5) 1184 (2003).

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熱膨脹對體積全像的影響

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