Interference fringes between two separate lasers

Louradour, Frédéric; Reynaud, François; Colombeau, B.; Froehly, Claude

doi:10.1119/1.17298

Cited by 22 publications

(17 citation statements)

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“…16 However, other experiments show clear interference between two independent lasers, suggesting otherwise. 17 The notion of different photons interfering is satisfying only until one confronts similar experiments that continue to show this interference-even at the individual photon counting level! 18 This surprising effect is explained by noting that one cannot tell which source the photon came from, therefore the two processes interfere; in a sense, each photon is emitted by both lasers.…”

Section: Nature Of the Photonmentioning

confidence: 99%

A simple experiment for discussion of quantum interference and which-way measurement

Schneider

LaPuma

2002

American Journal of Physics

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We have developed a which-way experiment using visible light that is completely analogous to a recent experiment involving which-way measurement in atom interference. This simple experiment, easily accessible to undergraduate students and the resources of undergraduate departments, facilitates the examination of the key elements of which-way measurement, quantum erasure, and related mysteries of quantum measurement. The experiment utilizes a Mach-Zehnder interferometer, and visually demonstrates the loss of interference fringes when a which-way measurement is imposed, and the restoration of that pattern when the which-way information is destroyed. This device is also sensitive enough to observe interference fringes arising from single photons. We present a simple analysis of the interference appropriate for the coherent classical field limit and the single photon limit at a level accessible to undergraduates. We also briefly mention related issues on the nature of the photon.

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Section: Nature Of the Photonmentioning

confidence: 99%

A simple experiment for discussion of quantum interference and which-way measurement

Schneider

LaPuma

2002

American Journal of Physics

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“…( ) common f t ∆ the common perturbation of the lasers; 1 ( ) f t ∆ and 2 ( ) f t ∆ the unique part of perturbation of the lasers; 1 k and 2 k the wavenumbers of the lasers; ( ) k t ∆ the perturbation of the lasers; and 1 φ and 2 φ the arbitrary phase differences [5][6] . When the two beams are combined, it follows that the intensity of the combined beam of the two lasers is given as Schematics of (a) the tandem ECLD and (b) a setup using tandem ECLD.…”

Section: Tandem Ecld: Overviewmentioning

confidence: 99%

“…1) consisting of a series of moving interference fringes involves a possibility to transport small particles constantly. The series of interference fringes can be created via an interference of two laser beams having slightly different frequencies [5][6] . Moreover, a 'micropump' can be another way of realization of various applications including the optical conveyor 4 , optical sorting, and microfluidic sorting.…”

Section: An Optical Actuator Driven By Two Different Wavelengthsmentioning

confidence: 99%

Proposing a novel scheme for optical manipulation of objects using interference of two laser beams of different wavelengths

Maruyama¹,

Tagami²,

Okamura³

2007

SPIE Proceedings

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In this paper a novel scheme for optical manipulation of objects utilizing the frequency difference of two separate lasers is proposed. In this scheme interference fringes moving at constant speed generated from two counter-propagating laser beams are expected to transport small particles trapped. For this purpose a highly stable light source is needed. On the other hand, actuators are nowadays widely used for controlling the position of or moving an object. Among them, piezoelectric actuators are commonly utilized to accurately control the angle of a diffraction grating in an external cavity laser diode (ECLD). However, conventional use of piezoelectric actuators in ECLDs causes difficulty in continuous scanning of the wavelength of an ECLD. Here, the 'tandem ECLD' utilizing an electromagnetically-driven actuator instead of a piezoelectric actuator is proposed based on the theoretical calculation that, when two separate lasers with different wavelengths sharing a common perturbation term are combined, the wavelength of the combined laser can be controlled in terms of the frequency difference of the two lasers. The wavelength shift of a prototype of the 'tandem ECLD' with respect to the current applied to the electromagnetically-driven actuator is measured. It is shown that the wavelength tuning method of an laser diode (LD) using an electromagnetically-driven actuator at low voltage exhibits equivalent performance (2.51nm wavelength shift when 2.58mA applied) to the conventional method that causes wavelength tunability using a piezoelectric actuator.

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“…Furthermore, it has already been pointed out that our modern interpretation of Dirac's sentence should not be understood too restrictively [6], since interference between separate laser or atoms sources are now admitted and commonly realized (see for example Refs. [7][8][9]). Also, inverting Dirac's famous statement stays compatible with some recent variants of the historical Young's double slit experiment, where the following results have been reported:…”

Section: )mentioning

confidence: 99%

Simple alternative model of the dual nature of light and its Gedanken experiment

Hénault

2011

SPIE Proceedings

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In this paper is presented a simple alternative model of the dual nature of light, based on the deliberate inversion of the original statement from P. A. M. Dirac: "Each photon interferes only with itself. Interference between different photons never occurs." Such an inversion implies that photons and light quanta are considered as different classes of objects, but stays apparently compatible with results reported from different recent experiments. A Gedanken experiment having the potential capacity to test the proposed model in single photon regime is described, and its possible outcomes are discussed. The proposed setup could also be utilized to assess the modern interpretation of the principle of complementarity.

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Interference fringes between two separate lasers

Cited by 22 publications

References 0 publications

A simple experiment for discussion of quantum interference and which-way measurement

A simple experiment for discussion of quantum interference and which-way measurement

Proposing a novel scheme for optical manipulation of objects using interference of two laser beams of different wavelengths

Simple alternative model of the dual nature of light and its Gedanken experiment

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