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Optically compensating film of the dispersion

Author: LuoZhenYue
Tutor: GuPeiFu；LiuXu；ZhangYueGuang
School: Zhejiang University
Course: Optical Engineering
Keywords: Optical film Dispersion Compensation Chirp Optimization Phase test Time-Frequency Analysis
CLC: O484.1
Type: Master's thesis
Year: 2010
Downloads: 76
Quote: 0
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Abstract


Femtosecond laser pulse generation process, as the material dispersion and nonlinear effects lead to respective wavelengths, the group velocity of light propagation , and causes the phenomenon generates chirp pulse broadening, to compensate for this effect, is necessary to introduce a certain amount of negative dispersion . And compared to the other dispersion compensation device , such as grating , a prism pair, optical dispersion compensation film has low insertion loss , compensation accuracy good advantage , which in recent years has been widely attention. However, there is dispersion compensation film studies , there are some difficulties, mainly as follows: the design should also consider the dispersion characteristics and reflectivity requirements , preparation of the dispersion characteristics of the error is very sensitive to the lack of accurate testing methods and so on. To solve these problems , this paper focuses on two aspects of the design and testing carried out some exploration: ( a ) in the optimization design, the demand for a variety of practical use dispersion compensation designed a series of films , discussed various initial structure for the final design the impact of the results , and for the first time introduced the particle swarm optimization algorithm for the optimal design dispersion compensation film , and achieved good results ( 2 ) for dispersion compensation in time domain characteristics of the film some preliminary analysis using time-frequency analysis means the time domain analysis of the pulse broadening effects and chirp characteristics , frequency-domain analysis of various parameters on the time-domain characteristics ; while using finite-difference time-domain dynamic simulation of the optical pulse propagation within the structure of the film process , and through this method recorded maximum field strength values ??distribution characteristics can be used as the fight against light damage characteristics of a secondary analysis tool. ( 3 ) In the test , the built white light interferometry system for laboratory homemade dispersion compensation dispersion characteristics of films were tested to obtain a more reliable test results. Using a variety of signal processing methods to reduce the effect of noise test . It also explores the absolute white light interferometry system test phase , the film thickness inversion, bulk material dispersion testing and testing of piezoelectric properties of potential applications.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics > Film growth,structure and epitaxy
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