中文摘要
利用腔內倍頻的方式所產生可見光固態雷射常可做為全彩雷射顯示器中的背光源等運用，雖然利用腔內倍頻可以提高倍頻光的轉換效率，但是因為也同時會產生綠光雜訊的問題而造成可見光功率的不穩定，導致運用方面的限制，為了要避免出現此現象產生，我們必須讓雷射共振腔中只有一個縱模存在，在本文中，我們利用Volumetric Bragg grating（VBG）對光譜有較高的選擇性而作為雷射的cavity mirror，並且和用約99.5%左右HR@1064 nm mirror作為cavity mirror時所量測的結果作比較，我們發現用VBG作為cavity mirror時所產生的綠光功率比用約99.5%左右HR@1064 nm mirror作為cavity mirror時來的小，但是卻只有用VBG時才能達到單模並且成功讓雜訊減小，我們所能達到的單模綠光功率約0.60 mW。
我們也試圖製造週期性極化反轉摻MgO的鈮酸鋰晶體（PPMgLN）來作為倍頻晶體，藉由QPM方式來使用晶體的最大非線性係數以提高倍頻光的轉換效率，在成品製作完成後，我們也將我們的自製的PPMgLN作光學的量測，並且對如何去提高自製的PPMgLN的品質加以探討和研究，以期達到更深的Poling 深度，並希望將來能結合VBG達到更高的單模綠光輸出功率，以產生小雜訊且高功率的單模綠光雷射。

Abstract
Intracavity doubled diode-pumped solid-state lasers can be consi-dered as the scanning light source or backlight in laser displays which have been an attractive alternative of other popular flat panel displays, such as liquid crystal display and organic light emitting diode. However, the intrinsic “green problem” which makes the laser power fluctuate is observed. The phenomenon can be prevented when there is only one longitudinal mode in the laser cavity. In order to accomplish the purpose, we used a Volumetric Bragg grating (VBG) with high spectral selectivity to be a laser cavity mirror, and compared with HR@1064 nm mirror. In the experiment, we observed that the green laser’s power of VBG’s cavity would be smaller than the power of HR@1064 nm mirror’s cavity, and we only observed single mode in the VBG’s cavity. We got the green laser’s power for the single frequency is near 0.60 mW and observed that the green problem would be reduced.
We also intended to enhance the second-harmonic conversion effi-ciency. We fabricated a piece of periodically poled lithium niobate doping MgO (PPMgLN), which has a large effective nonlinear coeffi-cient. We measured the optical parameters of our PPMgLN and tried to improve the quality of our PPMgLN. We expect to get the high power and low noise single frequency green laser by VBG and PPMgLN in the future.

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