Formation of circular fringes by interference of two boundary diffraction waves using holography

Kumar, Raj; Chhachhia, D. P.

doi:10.1364/josaa.30.001627

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Holographic optics has several advantages over conventional optical elements such as compactness, light-weight, easy fabrication and off-axis functionality. Thus holographic optics is used for realization of various optical systems and experimental setups [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A simple setup for measurement of the coherence length of a laser diode using holographic optics

Dubey

Kumar

2019

Eur. J. Phys.

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Due to improvements in the technology of laser diodes, nowadays they have become an integral part of most physics and engineering undergraduate courses. Laser diodes, which generally have low coherence, are extensively used in various educational experiments due to their compactness, ease of operation and handling, as well as their cost-effectiveness. Thus, knowledge about the coherence length of beams from these laser diodes becomes important when designing experiments using these as light sources. Generally, students find it difficult to measure coherence length with most of the existing techniques. In the present work an experimental arrangement using holographic optics is designed and demonstrated to measure the temporal coherence of a laser diode beam in a compact and easy-to-align manner. The proposed scheme is particularly suitable to measure short coherence lengths. The temporal coherence of a laser diode is measured to be 2.1 ± 0.02 mm, by varying separation between two holographic optical components. The results obtained are experimentally compared with results from a Michelson interferometer.

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Section: Introductionmentioning

confidence: 99%

A simple setup for measurement of the coherence length of a laser diode using holographic optics

Dubey

Kumar

2019

Eur. J. Phys.

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“…The shape of the fringes provides important information about the interfering wavefronts. Thus, various techniques have been reported to generate interference fringes having different shapes for different applications [2][3][4][5]. In optical shop testing [6], the shape of interference fringes provides direct visual information about the type and magnitude of aberrations in optical components.…”

Section: Introductionmentioning

confidence: 99%

Straight, conic and circular fringes in single interferogram

Rajkumar

2015

Eur. J. Phys.

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Interferometry is an important part of optics courses taught at the undergraduate level in universities throughout the world. It is used to explain to students the wave nature of light and is also used to measure parameters like length, refractive index, thickness of test samples and wavelength of light source, etc. The shape of interference fringes (linear, conic or circular) gives vital information about the interfering wavefronts and is used for firsthand visual inspection in optical shop testing and other applications of scientific and engineering importance. The present work describes a simple laboratory technique to generate fringes with different shapes in a single interferogram. This is achieved by using our diffraction-Lloyd mirror interferometer where two portions of the diffracted field are superimposed to generate the interference fringes. The technique is quite helpful in explaining the role of source orientation on the shape of interference fringes to students.

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Two point-source interference: a study of the formation of concentric circular fringes

Thomas

2021

IOPSciNotes

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In this short paper, the hyperbola-based analysis of wave interference recently developed by Thomas is employed to study the pattern of concentric circular fringes captured on a distant screen, when its plane is oriented orthogonal to the line joining two coherent point-sources. Newton’s rings are another instance of concentric circular fringes, generated with an extended source and a plano-convex lens-glass plate combination. The underlying geometry of the latter scenario, as described in the literature, allows for the estimation of two important physical parameters viz. the wavelength of light and the refractive index of a liquid medium. It is demonstrated here that the geometrical arrangement of the former scenario can in principle, be utilized to reach the same ends as well. Additionally, the hallmark distinguishing features of both types of circular fringe patterns are qualitatively and quantitatively elucidated.

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Formation of circular fringes by interference of two boundary diffraction waves using holography

Cited by 6 publications

References 17 publications

A simple setup for measurement of the coherence length of a laser diode using holographic optics

A simple setup for measurement of the coherence length of a laser diode using holographic optics

Straight, conic and circular fringes in single interferogram

Two point-source interference: a study of the formation of concentric circular fringes

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