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A real-time displacement sensor based on a laser diode interferometer that has a coaxial structure is proposed and demonstrated. Several measurements indicate measurement accuracy of 0.1 mum.
In INSS2008, we described a new principle for monitoring full-axis (three translational and three rotational) deformation of large and long structures such as bridges, roads, and railways. It is based on a combined use of an optical Laguerre-Gaussian (LG) beam and correlation image sensor (CIS). In this paper, we describe theoretically and examine experimentally several key issues of this technology...
A radially polarized beam was amplified up to 1.1 W by passing through an Yb-doped double clad fiber pumped by a semiconductor laser, maintaining both the polarization and intensity patterns of the input beam.
Single higher-order transverse mode operation with radial polarization of a Nd:YAG laser was demonstrated by use of a spatially reflectivity-modulated output coupler. By adjusting the cavity, TM02, TM03, and TM04 modes were selectively obtained.
By varying the length of a flat-flat cavity, polarization selective operation of a Nd:YAG laser was achieved only in a stable region of either TM01 or TE01 mode based on cavity stability incorporating thermally effects.
This paper outlines a new research project (CREST) for structure health monitoring. The purpose is to develop a networked sensor for static, full-axis deformation of large and long structures such as bridges, roads, and railways. We propose a novel technique based on the combined use of an optical vortex (OV) beam and correlation image sensors (CIS). Since the beam profile of OV involves definitive...
Beams with spiral phase shift are generated using a duodecimally divided half waveplate in a Ti:sapphire laser cavity. Either Laguerre-Gaussian or radially polarized laser beam with orbital angular momentum is obtained from the cavity.
Transverse mode conversion by second harmonic generation is demonstrated using focused axially symmetric, polarized beams with spatial variation of ellipticity. Superposition of higher order transverse modes of Hermite-Gaussian or Laguerre-Gaussian beams forms peculiar intensity patterns.
Cylindrical vector beams were generated from a Nd:YAG laser cavity including an undoped c-cut YVO4 crystal. By simply adjusting the length of an asymmetric concentric cavity, the selection of radial or azimuthal polarization was possible.
FEL project for industrial application was started in Japan. The purpose of this project is to generate FEL from FIR to UV and use it to investigate industrial applications. FEL Engineering Corporation is founded to perform this project.
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