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Ultrahigh axial resolution OCT and enhanced penetration in highly scattering media is demonstrated with two fiber broadened femtosecond light sources, operating in the visible and in the near infrared in human cells and other human biopsies.
Summary form only given. Progress in high power ultrashort pulse lasers has opened new frontiers in physics and technology of light-matter interactions. Recent discoveries span from coherent X-ray generation and nonlinear Thomson scattering to anomalous anisotropic light scattering and direct writing of 3D photonic structures. We report the observation of a new phenomenon-anisotropic ultraviolet generation...
Summary form only given. Experiments were performed by picosecond four wave mixing on a 7 /spl mu/m-thick MOCVD-grown GaN epilayer using the second-harmonic of a modelocked, Q-switched Nd:YAG laser. In order to directly measure the total scattering efficiency, the boxcar geometry was used. The nonlinear refraction coefficient can then be determined from a relation.
Summary form only given. Optical imaging in scattering media has generated much interest in recent years because of its potential as a diagnostic tool in medicine. We have developed a femtosecond optical parametric amplifier (OPA) and applied it to detect unscattered or backscattered photons, which have travelled through a scattering medium made of nanospheres of latex in water. In conclusion we demonstrated...
Summary form only given. Generating femtosecond X-ray pulses via Thomson scattering of ultrashort laser pulses with relativistic electrons has a number of attractive advantages over other approaches. The duration of the generated X-rays is determined by the focal spot of the electron beam and the optical pulse duration. Thus generation of X-ray pulses of <100 fs duration is relatively straightforward...
Summary form only given. High-peak-power pulsed lasers operating around 1.5 /spl mu/m and generating nanosecond pulses at repetition rates from hundreds hertz to tens of kilohertz are of interest for various applications in eye-safe ranging, remote sensing and in fiber reflectometry etc. A number of techniques have been used. Here, we demonstrate a novel self-Q-switched Er-doped fiber laser generating...
Summary form only given. To develop a simple technique for imaging hidden objects embedded in or behind a scattering medium is challenging for many applications (e.g. biomedicine). One of the promising techniques developed is to use short pulse Raman gating in hydrogen for detection of unscattered photons, which carry the least degraded image information. For practical purposes however, Raman imaging...
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