Showing papers on "Mach–Zehnder interferometer published in 1975"
TL;DR: In this paper, the Intensity Interferometer (II) was used to measure the intensity of the interference produced by the intensity interferometer, and it was shown that the II can be used to detect interference.
Abstract: (1975). The Intensity Interferometer. Optica Acta: International Journal of Optics: Vol. 22, No. 6, pp. 561-561.
198 citations
26 citations
TL;DR: Two analytic examples are presented that demonstrate that under the above conditions the deduced refractivity distribution can be dramatically incorrect, both qualitatively and quantitatively, if an inverted Abel equation is used to reduce the fringe-shift data.
Abstract: Refractively inhomogeneous, cylindrically symmetric test objects, when placed in a Mach-Zehnder interferometer, cause fringe shifts that cannot be reduced with an inverted Abel integral equation to accurately determine the internal index of refraction distribution. Optical principles have been used to formulate an appropriate method of data reduction that is amenable to reasonably simple numerical procedures. Two analytic examples are presented that demonstrate that under the above conditions the deduced refractivity distribution can be dramatically incorrect, both qualitatively and quantitatively, if an inverted Abel equation is used to reduce the fringe-shift data.
17 citations
TL;DR: In this article, a 1GW, 125 J CO2 laser pulse focussed by a 10 cm f.l. parabolic mirror has been used to induce breakdown and heating in 15'Torr hydrogen along the axis of a short 50'kG magnetic mirror field.
Abstract: A 1 GW, 125 J CO2 laser pulse focussed by a 10 cm f.l. parabolic mirror has been used to induce breakdown and heating in 15 Torr hydrogen along the axis of a short 50 kG magnetic mirror field. Evolution of the breakdown plasma thus produced has been studied by high speed photography, ruby laser Thomson scattering, and a Mach–Zehnder interferometer. Results indicate an efficient radial confinement of plasma by the mirror field with an electron temperature much enhanced over that resulting from a fieldfree breakdown. Interferometric measurements show that breakdown results in a cylindrical plasma with an electron density minimum on axis in both cases. A monitor of the transmitted CO2 laser pulse indicates very incomplete coupling of laser radiation into the plasma column with the field applied, presumably due to refraction losses at the entrance boundary of the breakdown.
8 citations
TL;DR: In this paper, the use of a random partial diffuser is suggested as a beam spitter for absolute measurements with a sensitivity equal to that of a Mach-Zehnder interferometer.
4 citations
2 citations
1 citations
TL;DR: In this paper, the effect of free field fringes on the interferogram of convection from a vertical surface with uniform heat flux was investigated and it was shown that at excess temperatures of less than 1 k, the free fields had a marked effect on the convection of a liquid, while at about 1 k the fringe patterns produced by the boundary layer in the water agreed well with the prediction of theory.
Abstract: A theoretical and experimental investigation of the effect on interferograms of heat transfer from a liquid is reported. When the temperature of water in a tank differs from ambient, boundary layers are set up which produce the phenomenon of ‘free field fringes’, first reported by Knowles. At excess temperatures of less than 1 K the free field fringes had a marked effect on the interferogram of convection from a vertical surface with uniform heat flux but at excess temperatures of about 1 K the fringe patterns produced by the boundary layer in the water agreed well with the prediction of theory.
1 citations
1 citations
1 citations