High Efficiency APE PPLN Waveguide
碩士 === 國立清華大學 === 電機工程學系 === 92 === Optical waveguides fabricated on the Periodically-Poled LiNbO3 (PPLN) is commonly used for nonlinear devices. There are several methods to do this work by proton-exchange or Metal-in-diffused technologies. This thesis introduces the annealing liquid-phase proton-e...
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| Format: | Others |
| Language: | en_US |
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2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/11021920584854400411 |
| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 92 === Optical waveguides fabricated on the Periodically-Poled LiNbO3 (PPLN) is commonly used for nonlinear devices. There are several methods to do this work by proton-exchange or Metal-in-diffused technologies. This thesis introduces the annealing liquid-phase proton-exchange (APE) technology to fabricate optical waveguide devices, and has higher conversion efficiency for second harmonic generation (SHG).
The proton-exchange technology has been developed for many years, and many kinds of exchange source have been used. Benzoic acid is most used for proton sources. We completely setup a recipe of coating SiO2 thin film by the sputter and the APE technology. The thin film quality will affect the phase-matching condition and the conversion efficiency. We will invite a new method of coating the denser and more uniform film and optimize APE conditions to get a higher SHG conversion efficiency.
The APE PPLN waveguides with 40 mm-long quasi-phase matching (QPM) section will obtain a normalized conversion efficiency about 31 % W-1 cm-2 with the pumping power of 21mW. The crystalline phase is changed to a �� phase. The propagation loss at 1550nm is about 0.4dB/cm. The higher conversion efficiency will be very useful for many waveguide applications.
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