Photoinduced Kerr rotation spectroscopy for microscopic spin systems using heterodyne detection

High Performance Method for Skin Roughness Detection Using Raman Spectroscopy

Rotation detection by optical heterodyne fiber gyro with frequency output.

A fiber gyro with optical heterodyne detection is proposed. The experimental setup has been constructed and tested. Both the frequency difference in the fiber and the path-length difference between counterpropagating waves are eliminated to reduce output drift. An electronic circuit for phase-nulling detection has been constructed, which gives an electronic frequency output in proportion to the...

Kerr rotation in Cu, Ag, and Au driven by spin accumulation and spin-orbit coupling

We measure transient spin accumulation in Cu, Ag, and Au by time-resolved magneto-optical Kerr effect. The transient spin current is generated by ultrafast demagnetization of a ferromagnetic [Co/Pt] layer, and spin accumulates in an adjacent normal metal, Cu, Ag, or Au by spin diffusion. The magnitude of the Kerr rotation is described by an off-diagonal conductivity tensor that is proportional ...

Spectrometers for Heterodyne Detection

Heterodyne spectrometers split naturally into two sections: a front-end that shifts the input band to lower frequency and amplifies it, and a back-end which analyzes and detects the signal. This brief review discusses requirements for spectrometer back-ends at submillimeter and far-infrared wavelengths, describes basic spectrometer technology, and indicates some of the important areas for futur...

Few-photon heterodyne spectroscopy.

We perform a high-resolution Fourier transform spectroscopy of optical sources in the few-photon regime based on the phenomenon of two-photon interference in a beam splitter. From the heterodyne interferogram, between test and reference sources, it is possible to obtain the spectrum of the test source relative to that of the reference. The method proves to be a useful asset for spectral charact...