全像碟片與全像儲存系統Holographic storage disk and holographic storage system

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

15/011,627

專利證號

US 9,466,326 B2

專利獲證名稱

全像碟片與全像儲存系統Holographic storage disk and holographic storage system

專利所屬機關 (申請機關)

國立中央大學

獲證日期

2016/10/11

技術說明

於全像儲存碟片中建立反射結構所組成之腔體能夠增加全像儲存材料之利用率，然而此種結構會引入較高的邊界散射雜訊。本專利提出數種降低雜訊的方式，在SLM的參考光區域，我們輸入碟片邊界遮蔽訊號；在腔體入口的共軛影像處，我們放置使用平移裝置移動的邊界濾波器；在物鏡的前焦面，我們放置不遮蔽參考光與訊號光的低通濾波器；在碟片的腔體中我們加入1/4波板層，在繞射訊號中傳至成像模組的光路中，我們使用偏振光濾波器濾除呈正交偏振的散射雜訊。 Holographic storage discs consisting of reflective cavity structure can increase the utilization of the whole image storage materials, however, this structure will introduce higher boundary scattering noise. The patent suggests several ways to reduce noise. In the reference light region of the SLM, we enter the disc boundary masking signals; at the position of conjugate image of the entrance of the cavities, we placed moving boundary filters using translational means; in the front focal plane of objective lens, we put low-pass filter without sheltering reference light and signal light; in the disc cavity layer we add the 1/4 wave plate; in the light path between diffraction signal and image detector, we use polarizing filter to filter out the orthogonally polarized scattering noise.

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