112 research outputs found
Broadband optical supercontinuum generation in a long cavity fibre laser
We describe optical supercontinuum generation in an actively mode-locked
fibre ring laser using a pulsed mode-locking technique.
Recirculation of a section of the continuum facilitated spectral
broadening
Ge-Doped microstructured multicorefiber for customizable supercontinuum generation
Supercontinuum generation in a multicore fiber in which several uncoupled cores
were doped with dissimilar concentrations of germanium was studied experimentally.
Germanium doping provided control over the separation between the zero-dispersion
wavelength and the 1064-nm wavelength of a Q-switched Nd:YAG pump laser. Supercontinua
generated independently in each core of the same piece of fiber displayed clear
and repeatable differences due to the influence of germanium doping on refractive index and
four-wave mixing. The spectral evolution of the subnanosecond pump pulses injected into
the different cores was accurately reproduced by numerical simulations
Nonlinear beam cleanup in Yb-doped GRIN multimode fiber taper
We demonstrate beam self-cleaning in a tapered Ytterbium-doped graded- index multimode fiber in both active and passive configurations, without accompanying self-phase modulation induced spectral broadening or frequency conversio
Absolute Interferometric Measurement of Differential Displacements
The paper describes an interferometric technique
suitable for the absolute measurement of displacements with
nanometer resolution over a range up to few hundreds of
micrometers. The displacement pick-ups are linked with optical
fibers. The laser source is a VCSEL operated with a continuous
wavelength modulation. The measurement is obtained combining
absolute frequency-based measurements with phase-based
measurements. The uncertainty analysis shows the conditions that
must be fulfilled to get the best results. To build a compact sensors it
is proposed the use of a DOE as a beam splitter and fiber coupler
Relationships between real-time and fault tolerance: A case study of a redundant loop data acquisition network
High-accuracy system for robot calibration using a high-frequency phase modulation interferometer
Strumentazione automatica per misure industriali: calibro multiquota inseribile in una rete di acquisizione dati
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