| Summary: | 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.
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