飛秒雷射技術與其在非線性顯微術上的應用

Abstract

本論文主要是研究控制和量測飛秒賣衝。在控制上，我們用Gerchberg-Saxton演算法，來設計飛秒賣衝波形。在量測方面，我們提出一個新的演算法，得以精確量測賣衝。在實驗和模擬上這個新的演算法都比傳統的基因演算法快、更精確、更能抵抗雜訊的影響，我們運用此演算法探測三種不同的半導體飽和吸收反射鏡。我們也運用此技術到非線性顯微術上。

In this thesis we demonstrate how to design and measure optical pulses. We demonstrate how to design and synthesize optical pulses by using Gerchberg-Saxton algorithm. A newly developed phase-freezing scheme for characterization and adaptive control of coherent optical pulses is described. The operational principle is based upon the concept that the highest peak intensity shall correspond to a complete frozen-phase state of all spectral components involved in a coherent optical pulse. Our experimental and theoretical results reveal this new scheme to be faster, accurate and more immune to the noise and laser power fluctuation than that with genetic algorithm. This freezing phase scheme had been employed for investigating three types of semiconductor saturable absorber Bragg reflectors (SBR) and the influence on the spectral phase distortion with subtle change of device structure was revealed. The application of the new phase freezing scheme on nonlinear optical microscopy is also presented.