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The absolute measurement of the mass, as well as the determination of the Planck constant, has become one of the most important issues in metrology toward a new kilogram definition based on fundamental constant. A method for measuring the inertial mass, being different from the gravitational mass measurement by either a watt balance or the Avogadro project has been carried out recently at National...
An intense research effort has been channelled into improving mode-locked Yb-fiber oscillators in recent years. Despite efforts in all-normal dispersion oscillators, dispersion management is evidently necessary to reach pulse durations below 50 fs. This is implemented most commonly with bulk optical components in Yb-doped fiber lasers. Increased robustness remains a valuable trait, for which all-fiber-integration...
DDS sources were developed in NIM for impedance measurements. Stable and accurate phase difference can be obtained easily by this technique. It has been used for mutual inductance measurements and an uncertainty of 1×10-7 has been obtained.
A Tm-doped fiber master-oscillator power-amplifier system that generates over 100 W of single frequency output in a near-diffraction-limited beam with an M2 parameter of 1.25 is described. The prospects for further increase in power are considered.
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