用於全像儲存之同差檢測技術

全像資訊儲存技術急需一種簡單並具備波前像差容忍度的方法來解碼相位訊號。我們提出並驗證了基於雙頻光柵的剪切干涉術能夠使用單次曝光達到二階相位訊號解碼，橫向剪切量取決於雙頻光柵的頻率差與準直透鏡的焦距，實驗證實繞射波的相位編碼被成功地解碼。我們建立並以實驗驗證基於雙頻光柵的剪切干涉術的光學模型，並使用此光學模型證明基於雙頻光柵的剪切干涉術用於全像儲存系統中純相位訊號讀取時的高像差容忍度。

關鍵字

體積全像資訊儲存；同差檢測；雙頻光柵；剪切干涉術；像差容忍度

並列摘要

A simple method to decode the stored phase signal of volume holographic data storage with adequate wave aberration tolerance is highly demanded. We proposed and demonstrated a one-shot scheme to decode a binary-phase encoding signal through double-frequency-grating based shearing interferometry (DFGSI). The lateral shearing amount is dependent on the focal length of the collimated lens and the frequency difference between the gratings. Diffracted waves with phase encoding were successfully decoded through experimentation. An optical model for the DFGSI was built to analyze phase-error induction and phase-difference control by shifting the double-frequency grating longitudinally and laterally, respectively. The optical model was demonstrated experimentally. Finally, a high aberration tolerance of the DFGSI was demonstrated using the optical model.

並列關鍵字

Volume holographic data storage ； homodyne detection ； double-frequency-grating ； shearing interferometry ； aberration tolerance

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