臺灣博碩士論文加值系統

在學術研究及商業應用對藍光光源的需求日益增加，然而現有的半導體雷射技術仍無法製作出實用性的短波長雷射。若能利用非線性晶體以二倍頻、和頻或差頻的方式，以現有的雷射光源就可以創造出幾乎涵蓋整個波段的光源。
利用準相位匹配法，僅需將雷射光耦合至具有週期性區域反轉之光柵與波導結構的非線性晶體中，即可轉換出高效率的二倍頻。同時利用光波導使得光場集中，非線性現象將更加明顯。
我們利用鈦擴散引致週期性區域反轉方式，配合鎳擴散式波導以及質子交換波導兩種方式，以扇形之光柵設計，針對固定波長 980nm 的基頻光，成功的製作出二倍頻的元件，產生肉眼可見之藍光。由量測所得之基頻光功率對二倍頻光功率的曲線，可推得正規化之轉換效率約為 2.6%/W。我們同時也探討了波導製程對週期性區域反轉的相容性，證實了波導製程並未破壞週期性區域反轉的結構。

The current demands of blue light sources are emerging for the
academic and industrial applications.
However, short wavelength industrial grade lasers cannot be
easily fabricated with the existing semiconductor laser techniques.
Using second harmonic generation, sum frequency generation or
difference frequency generation on nonlinear crystals,
it is possible to produce lasers covering the whole
spectral range with the current availability of limited
laser sources.
With quasi-phase matching technique, it only requires the coupling of light
to the nonlinear crystal which has periodic domain inversion grating
and waveguide structures, and a subsequently efficient double frequency
generation of light can be made.
As we enhance the optic field by focusing light into the
waveguides, the nonlinear phenomena will be more pronounced.
We introduce periodic domain inversion via diffusion of titanium,
in combination with nickel-indiffused and annealed proton exchange
waveguides, and fan-out design of grating. Aimed at a fundamental
pump frequency of 980nm diode laser, we successfully produced
devices of second harmonic generation for blue light.
The calculated normalized conversion efficiency is about 2.6%/W.
We also discuss the compatibility of the fabrication processes
of waveguide and periodic domain inversion, and prove the processes
would not destroy the structure of periodic domain inversion.

第一章 緒論
第二章 準相位匹配法
第三章 鈮酸鋰元件製程
第四章 準相位匹配法元件製作
第五章 實驗結果
第六章 結論及未來展望

吳振弘, "鈮酸鋰準相位匹配二倍頻元件之研製"
國立臺灣大學光電工程學研究所碩士論文，1996。