Extreme-Ultraviolet Digital Holographic Microscopy

• Main Authors: Bing Kuan Chen, 陳秉寬
• Other Authors: 黃升龍
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/66412628222489020811

博士 === 國立臺灣大學 === 光電工程學研究所 === 104 === Bright short-wavelength coherent light sources owe their existence to the growing potential demand in both fundamental researches and industrial applications. With the advent of high-field lasers based on the chirped-pulse amplification technique, generating ultrashort coherent extreme-ultraviolet radiations with a much lower cost and even smaller size is no longer pie in the sky. In Chapter 1 and Chapter 2, we report the recent development of the extreme-ultraviolet laser at 32.8 nm in our laboratory. An average output of 10^12 photons per pulse is obtained at a pump energy of less than 1 joule, reaching an unprecedentedly high energy conversion efficiency of around 10^−5. Chapter 3 to Chapter 5 focus on a newly developed twin-free digital holographic microscopy using a 32.8-nm extreme-ultraviolet laser as the source of illumination. The computational core, single-hologram inter-projections algorithm, is numerically and experimentally proved to be capable of effectively depressing the phase ambiguity that is always encountered in the conventional reconstruction method, leading to high-fidelity object images without annoying twin disturbances. Full exemption from seeking a tight support constraint for retrieving the correct object phase also makes single-hologram inter-projections reconstruction method more fit for volumetric imaging that intrinsically requires a great amount of computational effort.