本論文主要研究摻雜雷射染料與偶氮染料摻雜聚合物-液晶混合薄膜之全像光柵在外加電壓調控與在雙光子調控下，其樣品雷射輸出強度所發生的改變。實驗結果顯示我們可以藉由提高電壓與增強照射cw綠光雷射能量來降低雷射輸出能量，最主要有兩個原因，其中一個原因雷射染料的吸收的降低而使得螢光放射減少；另外一個原因為液晶與聚合物層之間的折射率差降低使得正向與反向螢光耦合係數減少，以上兩個原因將使得雷射輸出能量下降。電壓調控與雙光子調控最大的差異是在電壓增加會使得液晶排向趨向於與玻璃基板垂直，而照射cw綠光雷射將使得偶氮染料由棒狀的trans態變為彎曲狀的cis態進而帶動液晶轉變為isotropic態。此外，如果使用cw綠光雷射先照射樣品一段時間後使樣品幾乎無法產生雷射輸出，之後再用一道強紅光雷射照射樣品，我們會發現紅光雷射照射時間越久，樣品產生的雷射能量有明顯越來越變強回來的趨勢，這是由於受綠光雷射照射下足夠濃度染料轉變為cis態所導致液晶等溫相變的現象，因為照射強度夠強且時間夠久的紅光雷射使得偶氮染料轉變回trans態，進而使得液晶回復到原向列相後，此時雷射輸出能量又逐步回復。

This study demonstrates the electric and biphotonic controllability of the lasing emission based on the holographic dye-doped polymer-dispersed liquid crystal (H-DDPDLC) films. Experimental results show that the lasing emission decreases with increasing either the amplitude of the applied voltage or the intensity of the incident cw green beam. This is attributable to two factors. One is the decrease of the absorption of the laser dyes and thus the intensity of the emitted fluorescence. Another is the decay of the difference between the refractive indices in liquid crystal-rich and polymer-rich regions and thus the coupling coefficient of the fluorescence. The two factors cause the decay of the lasing emission. The difference operated in the two ways is that the applied field will align LC to be normal to the substrates of the cell and the illumination of the incident cw green beam will transform azo-dyes to bended cis-isomers to disturb the LC into isotropic phase. Furthermore, if the intensity of a strong red beam irradiated on the green-beam-illuminated cell gradually increases, the cis-dyes will cis–trans back isomerized to trans-state such that the isotropic LC can gradually return back the nematic phase and thus the lasing emission can gradually recovery.

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