週期極化鈮酸鋰(PPLN)運用於頻率轉換時，常以二倍頻的方式呈現，當輸出光為可見光時，限制了輸入光源的波長範圍。以和差頻的方式產生光源時，則可使用的輸入光源的波長範圍能增加，本論文以準相位匹配原理，經MATLAB模擬和頻所需要的週期，以1064nm與1550nm為輸入光源，欲得輸出和頻為630nm紅光。
在製作的部分，先以黃光為影製成定義週期(Λ)之DC(Duty cycle)，接著再進行高壓極化的步驟。高壓極化為製作週期穩定度的重要步驟，已知鈮酸鋰之矯頑電場為21kV/mm，在此前先輸入略低於頑強電場18.5 kV/mm次數100次之成核電廠，每次時間100ms，緊接著施加極化電場22.7kV/mm時間為150ms，可得一位符合和頻之週期為11.5μm之週期極化反轉光柵。極化後的鈮酸鋰，利用氫氟酸對鈮酸鋰正負z面與正負y面之蝕刻速率不同，在光學顯微鏡下，分別觀察z切面與y切面之極化與極化的區域的情形。光學繞射法為將蝕刻後的週期性反轉鈮酸鋰至於載台上，以可見光雷射量測，由光點的距離再驗證光柵週期是否吻合。
在量測結果部分得到的結果為綠光，則反推出在輸入光源在光纖藕何時，因色散效應產生的差頻，與輸入光源和元件上的周期交互影響，並經準相位匹配原理佐證為一致。

The PPLN (periodically poled lithium niobate) is used for the purpose of frequency conversion and the result shows that SHG (Second Harmonic Generation) of converting 1064 to 532nm is successfully demonstrated. Furthermore, the sum frequency generation (SFG) is also attempted to generate 630nm visible light output by redesigning PPLN to simultaneously accommodate 1550nm signal and 1064nm pumping wavelength as inputs. Unexpectedly a green light output is observed instead, which is further speculated that the final observation is possibly due to the combined influences of a difference-frequency generation (DFG) process and four-wave mixing (FWM) effect.

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