Rayleigh backscattering, optical fiber, optical time reflectometry, OTDR, white light interferometry, optical lowcoherence reflectometry Rayleigh backscattering at a wavelength of 1.55 um is measured in standard single-mode fiber with a spatial resol ution of 32 um and a dynamic range of over 30 dB. A minimum reflection sensitivity of -148 dB is the best reported to date using optical low-coher...

A quasi-distributed fiber sensor system for smart-structure applications is proposed. The system is based on a fiber loop topology and interrogated by use of white-light interferometry. The results of preliminary experiments and a power budget analysis are presented.

Holographic interferometry with a phase-modulated reference beam is used to visualize a progressive ultrasonic wave in the interior of a transparent medium. The medium is illuminated with sheetlike light, and the light scattered from the plane of the light sheet is recorded in the hologram. The ultrasonic field on the plane is obtained from the reconstructed image, which provides the equiphase ...

Dispersion properties of novel, tapered, air-silica microstructure fibers are measured between 1.3 and 1.65 microm by white-light interferometry. Dispersion values (beta2) of -181 and -152 ps2/km were obtained for 2.2- and 3-microm core sizes, respectively, at lambda = 1.55 microm.

The effect of focal spot size on in-band 13.5 nm extreme ultraviolet (EUV) emission from laser-produced Sn plasmas was investigated for an EUV lithography light source. Almost constant in-band conversion efficiency from laser to 13.5 nm EUV light was noted with focal spot sizes from 60 to 500 microm. This effect may be explained by the opacity of Sn plasmas. Optical interferometry showed that t...

In this paper, we proposed a phase shifting Lau phase interferometry for the measurement of the focal length of a lens. The fundamentals of this application are discussed and the basis of the phase map interpretation is outlined. A three step phase-shifting algorithm is used to depict the phase maps of a lens-like test object and an application for measuring the focal length of a lens is report...

A systematic shift of the photon recoil momentum due to the index of refraction of a dilute gas of atoms has been observed. The recoil frequency was determined with a two-pulse light grating interferometer using near-resonant laser light. The results show that the recoil momentum of atoms caused by the absorption of a photon is n variant Planck's k, where n is the index of refraction of the gas...

We used low coherence interferometry to measure Brownian motion within highly scattering random media. A coherence gate was applied to resolve the optical path-length distribution and to separate ballistic from diffusive light. Our experimental analysis provides details on the transition from single scattering to light diffusion and its dependence on the system parameters. We found that the tra...

Abstract Optical interferometry has been a long-standing setup for characterization of quantum states light. Both linear and the nonlinear interferences can provide information regarding light statistics underlying detail light-matter interactions. Here we demonstrate how interferometric detection spectroscopic signals may be used to improve measurement accuracy matter susceptibilities. Light-m...