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Femtosecond lasers began to draw attention as a new light source for high-precision absolute distance measurements (ADMs) allowing for advanced principles such as synthetic wavelength generation, Fourier-transform-based dispersive analysis and multi-wavelength interferometry. In this talk, we present the state-of-the-art measurement principles and performance demonstrated by exploiting the unique...
Femtosecond pulse lasers provide novel possibilities to high-precision optical profilometry for quality assurance of step-structures on 3D microelectronic products based on its time and frequency domain characteristics.
Femtosecond pulse lasers offer breakthroughs in precision metrology particularly in the fields of time, distance and spectroscopy. This advance attracts much attention to extend today's space missions by improving the precision of remote sensing and control capabilities. In this presentation, we introduce how femtosecond lasers are being investigated for space explorations in the near future.
This paper proposes an efficient detection of absolute robot arm position using dual incremental encoders. We considers a robot joint comprising a motor, a reducer, two encoder, and motor driver. An incremental(first) encoder provides motor rotor position or input position of reducer while another incremental(second) encoder does output position of reducer. A table is made where a relationship between...
We present an Er-doped fiber femtosecond laser having a wider repetition rate tuning range by introducing a pair of CFBGs which magnifies the cavity length change by 15 times.
We exploit femtosecond pulses for time-of-flight measurement of distances. Not only long distances but also short distances less than 10 m are measured with sub-micrometer precision beyond the traditional limit of time-of-flight measurement.
We demonstrate an all-fiber-based apparatus built to generate near-infrared frequencies directly from an Er-doped fiber frequency comb. The amplified final output signal yields a frequency stability of 2×10−15 with a linewidth less than 1 Hz.
The optical frequency generator built using the optical comb of a femtosecond laser enables absolute distance measurements with sub-wavelength precision by performing multi-wavelength interferometry. This method will benefit precise manufacture of large objects and also future space missions.
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