基片傳輸型全像窄頻濾波片

Abstract

本論文提出一利用穿透式、反射式基片傳輸型全像元件組成的雙層構, 所 製作的光學窄頻濾波片。此濾波片具有超窄頻、高穿透率、可調性質與垂 直耦合輸入輸出等優點，可應太陽譜線的觀察、光纖通訊中波長多工及解 多工元件、光學交換、連接等。本文將先由耦合模理論與電腦模擬，計算 出此一元件所需的必要條件。在實驗中，我們以重鉻酸銨明膠與鹵化銀材 料，配合短波長記錄、長波長重建技術來製造全像光柵；在藉由單頻儀的 測量証實了組合穿透式、反射式部份後的元件具有使光波頻寬變窄的濾波 效果。 A new design for optical narrow-band filter is investigated by using substrate-mode holograms(SMHs). It combines transmission and reflection-type SMHs cascading up and down. This device has the advantages of narrow-linewidth(subnarometer), high transmittance (>90%), tunable central wavelength and normally incident and output coupling of the structure. Its applications include the detection of Sun's spectrum in solar astronomy, wavelength-division-multiplexing technology(WDM) in optical communication and wavelength selector for optical interconnection . Computer simulation of necessary conditions and experiment results with free space recording technology of short wavelength is presented. In our experiments, we also confirmed the filtering effect by light passing the combination of the two-type SMHs.