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Showing papers on "Mach–Zehnder interferometer published in 1969"


Journal ArticleDOI

26 citations


Journal ArticleDOI
TL;DR: In this paper, an experimental circuit for a Mach-Zehnder interferometer using a laser-like source is described. But the authors focus on the use of a laser as light source in interferometers.
Abstract: Applications of lasers as light sources in interferometers are analyzed. An experimental circuit is described. Interference patterns obtained with a Mach-Zehnder interferometer using a laser-like source are given.

9 citations


Journal ArticleDOI
TL;DR: In this article, a method of measuring the phase of vibrational displacement, utilizing a Michelson interferometer with a laser source, is described, and results of several applications are presented and discussed.
Abstract: A method of measuring the phase of vibrational displacement, utilizing a Michelson interferometer with a laser source, is described. Results of several applications are presented and discussed.

9 citations


Journal ArticleDOI
TL;DR: If the instrument is apertured in the usual way for scanning applications, the outer fringes of the interferometer will not appear at all, and under no circumstances will they appear as shown in Hercher's figure.
Abstract: (1) Wedge etalon effect. In discussing the wedge etalon effect, Hercher claims we failed to take notice of his stipulation that the interferometer is used in the scanning mode. However, if the instrument is apertured in the usual way for scanning applications, the outer fringes w ll not appear at all. If it is not apertured, they will appear as in our Fig. 1. Under no circumstances will they appear as shown in his figure.

5 citations




Journal ArticleDOI
TL;DR: In this article, a laser interferometer of the Mach-Zehnder type based on the use of a singlemode frequency-stabilised He-Ne gas laser, 6329 A in wavelength and with 100 μV output, has been used to measure accurately electron densities in the range 1014 −1015 cm−3 in a transient mercury-vapour plasma.
Abstract: A laser interferometer of the Mach-Zehnder type based on the use of a single-mode frequency-stabilised He-Ne gas laser, 6329 A in wavelength and with 100 μV output, has been used to measure accurately electron densities in the range 1014–1015cm−3 in a transient mercury-vapour plasma. An ‘amplitude’ (intensity) modulation system is employed in order to obtain a wide dynamic range. The interferometer system is mounted on a massive movable table in order to obtain the spatial distribution of electron density by means of sequential discharges. The experimental results show clearly that there are definite time delays between the peak of current in the discharge and the maximum value of the (average) electron density. The results are in good agreement with the values of electron densities obtained by the extrapolation from microwave measurements.

1 citations


Patent
Robert D Durand1, Thomas S Hahs1
18 Apr 1969

1 citations


Journal ArticleDOI
TL;DR: In this paper, an optical interferometer which employs a low power (100 µW) beam from a frequency stabilised He-Ne laser was used to find the effective change in path length due to the transient plasma in terms of fractional fringe shift.
Abstract: An optical interferometer which employs a low-power (100 µW) beam from a frequency stabilised He-Ne laser has been used to find the effective change in path length due to the transient plasma in terms of fractional fringe shift. The results confirm the magnitude of electron density previously deduced from the extrapolated microwave results and indicate a distinct time lag in the buildup of maximum electron density with respect to the transient current maximum. This implies a fall in drift velocity of electrons from the current peak to the electron-density peak which is a function of the degree of ionisation achieved.