title: Compact and high-efficiency device for Raman scattering measurement using optical fibers.
abstract: We describe the design and development of a high-efficiency optical measurement device for operation within the small bore of a high-power magnet at low temperature. For the high-efficiency measurement of light emitted from this small region, we designed a compact confocal optics with lens focusing and tilting systems, and used a piezodriven translation stage that allows micron-scale focus control of the sample position. We designed a measurement device that uses 10 m-long optical fibers in order to avoid the influence of mechanical vibration and magnetic field leakage of high-power magnets, and we also describe a technique for minimizing the fluorescence signal of optical fibers. The operation of the device was confirmed by Raman scattering measurements of monolayer graphene on quartz glass with a high signal-to-noise ratio.
authors.affiliation: Surface Physics and Structure Unit, Advanced Key Technologies Division, National Institute for Materials Science, Sakura 3-13, Tsukuba 305-0003, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Mitsui