Low-coherence heterodyne photon correlation spectroscopy.

Homodyne and heterodyne X-ray photon correlation spectroscopy: latex particles and elastomers

In a coherent X-ray small-angle experiment, heterodyning between the scattering amplitudes of two samples is obtained by stacking a static reference and a fluctuating sample. Results of homodyne and heterodyne measurements are compared in the case of 98 nm diameter latex particles in glycerol. The method is also used for the study of the slow relaxation process of carbon-blackfilled ethylene–pr...

High-Concentration Submicron Particle Size Distribution by Dynamic Light Scattering: Power spectrum development with heterodyne technology advances biotechnology and nanotechnology measurements

Modified two-photon absorption and dispersion of ultrafast third-order polarization beats via twin noisy driving fields

We investigate the color-locked twin-noisy-field correlation effects in third-order nonlinear absorption and dispersion of ultrafast polarization beats. We demonstrate a phase-sensitive method for studying the twophoton nondegenerate four-wave mixing NDFWM due to atomic coherence in a multilevel system. The reference signal is another one-photon degenerate four-wave-mixing signal, which propaga...

Path Length Resolved Dynamic Light Scattering Measurements with Suppressed Influence of Optical Properties Using Phase Modulated Low Coherence Interferometry

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...