Measurement of principal refractive indices of birefringent wafer by analysis of Fabry–Perot interference fringes

2014 ◽  
Vol 53 (24) ◽  
pp. 5527 ◽  
Author(s):  
Hee Joo Choi ◽  
Myoungsik Cha
Keyword(s):  
Refractive Indices ◽  
Interference Fringes ◽  
Fabry Perot

scholarly journals The difference between the mechanical and optical lengths of a steel end-gauge

1929 ◽  
Vol 122 (789) ◽  
pp. 122-133 ◽  
Keyword(s):  
Optical Length ◽  
Interference Fringes ◽  
Light Waves ◽  
Fabry Perot ◽  
The Difference ◽  
Block Gauge

The two lapped surfaces whose separation defines the length of a good end-gauge or block-gauge generally approach a degree of optical flatness and parallelism sufficient for their use in interferometry. If, therefore, such a gauge is supported between the semi-transparent mirrors of a Fabry-Perot étalon of greater length than the gauge, with its surfaces parallel to the mirrors, the gauge may be standardised in terms of light waves by the methods usually applied to Fabry-Perot étalons. In fig. 1 L is the optical separation of the étalon mirrors, l 1 and l 2 are respectively the optical separations of a gauge surface and an adjacent étalon mirror at each end of the figure, and O is the optical length of the gauge: therefore O = L — ( l 1 + l 2 ), (1) L is measured either directly or indirectly in terms of light waves, the choice depending upon the magnitude of L, while both l 1 and l 2 are measured directly in terms of light waves by observation of the reflected system of circular interference fringes; thus O may be obtained in terms of light waves.

Study of Variation in Order Parameter with Temperature of Mixtures of Nematic and Cholesteryl Liquid Crystal

2011 ◽  
Vol 181-182 ◽  
pp. 92-95
Author(s):  
Shezan Hasware ◽  
Ratnaraaj Parekh ◽  
Anil Devlekar ◽  
S.M. Bhatia
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Liquid Crystal ◽  
Order Parameter ◽  
Refractive Indices ◽  
Transition Temperatures ◽  
Fabry Perot ◽  
Mixture Samples ◽  
Crystal Mixture ◽  
Abbe Refractometer

The mixtures of nematic [4-Hexyloxy-4-Biphenyl carbonitrile] and cholesteryl propionate were investigated at various temperatures. Measurements of refractive index and transition temperatures were noted by using an Abbe refractometer with a heating arrangement. Ordinary and extraordinary refractive indices were obtained which helped us in calculating the order parameter and its variation with temperature. We also carried out Fabry-Perot Scattering Studies (FPSS) on our samples to confirm the various transition temperatures. Photographs of liquid crystal mixture samples placed between crossed nicols are taken at various temperatures to observe the phase transition.

Use of Fiber Interferometer for AFM Cantilever Probe Displacement Control

2005 ◽  
Vol 295-296 ◽  
pp. 77-82 ◽  
Author(s):  
N.C. Shie ◽  
T.L. Chen ◽  
Kai Yuan Cheng
Keyword(s):  
Light Intensity ◽  
Theoretical Equation ◽  
Displacement Sensor ◽  
Phase Array ◽  
Fibre Optic ◽  
Core Diameter ◽  
Atomic Force ◽  
Interference Fringes ◽  
Fabry Perot ◽  
Afm Cantilever

This investigation presents a fibre-optic Fabry-Perot interferometer as a displacement sensor in an atomic force microsope (AFM). A simple model of light wave transmission between two fibres with the same core diameter is proposed to determine the theoretical equation of light intensity of interference fringes from the fibre-optic Fabry-Perot interferometer. By replacing an AFM cantilever with a movable reflective mirror, the variations of relative light intensity of the interference fringes with the spacing between the fibre and the mirror were recorded. The theoretical equation for the light intensity of interference fringes was close to those obtained experimentally. Finally, a fibre-optic Fabry-Perot interferometer was operated in an AFM to image a two-dimensional phase array with a pitch of 4 µm and a depth of 150 nm.

Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
J. Kędzierski ◽  
Z. Raszewski ◽  
M. Kojdecki ◽  
E. Kruszelnicki-Nowinowski ◽  
P. Perkowski ◽  
...  
Keyword(s):  
Thin Film ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Monochromatic Light ◽  
Refractive Indices ◽  
Multiple Reflections ◽  
Edge Angle ◽  
Interference Fringes ◽  
Monochromatic Light Beam

AbstractA new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes appearing in polarised parallel coherent monochromatic light beam transmitted normally to the surfaces through a wedge cell filled with a nematic. Both glass plates confining the cell are coated with a partly transparent thin film of metal which is deposited by evaporation in vacuum. Owing to the multiple reflections between the surfaces and a small edge angle, the interference fringes observed near the wedge apex edge are sharp and equidistant. To apply this method one needs only small amount of an investigated liquid crystal. Basic mathematical formulae and results of an experiment are briefly discussed.

Méthode de fabrication et caractéristiques photographiques de photosystèmes de type Fabry-Pérot

1983 ◽  
Vol 61 (8) ◽  
pp. 1212-1217
Author(s):  
Daniel Saint-Germain ◽  
Germain Boivin
Keyword(s):  
Interference Filter ◽  
Refractive Indices ◽  
Lead Iodide ◽  
Photosensitive Element ◽  
Fabry Perot ◽  
Made In

The use of a Fabry-Pérot filter as a positive transmission photosystem is discussed first. Its construction is similar to an interference filter with multistacked mirrors. A lead–iodide and copper photosensitive element is made in such a way as to be combined with the multistacked mirrors. We then propose a method to fabricate the filter which is independent of the refractive indices of the materials. Finally, we present the sensitivity and contrast results of the photosystems.

scholarly journals Monitoring the Growth of a Microbubble Generated Photothermally onto an Optical Fiber by Means Fabry–Perot Interferometry

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 628
Author(s):  
J. Gabriel Ortega-Mendoza ◽  
Placido Zaca-Morán ◽  
J. Pablo Padilla-Martínez ◽  
Josué E. Muñoz-Pérez ◽  
José Luis Cruz ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Ccd Camera ◽  
Single Mode ◽  
Laser Source ◽  
Photothermal Effect ◽  
Interference Fringes ◽  
Time Period ◽  
Fabry Perot ◽  
The Time Domain ◽  
Practical Demonstration

In the present paper, we show the experimental measurement of the growth of a microbubble created on the tip of a single mode optical fiber, in which zinc nanoparticles were photodeposited on its core by using a single laser source to carry out both the generation of the microbubble by photothermal effect and the monitoring of the microbubble diameter. The photodeposition technique, as well as the formation of the microbubble, was carried out by using a single-mode pigtailed laser diode with emission at a wavelength of 658 nm. The microbubble’s growth was analyzed in the time domain by the analysis of the Fabry–Perot cavity, whose diameter was calculated with the number of interference fringes visualized in an oscilloscope. The results obtained with this technique were compared with images obtained from a CCD camera, in order to verify the diameter of the microbubble. Therefore, by counting the interference fringes, it was possible to quantify the temporal evolution of the microbubble. As a practical demonstration, we proposed a vibrometer sensor using microbubbles with sizes of 83 and 175 µm as a Fabry–Perot cavity; through the time period of a full oscillation cycle of an interferogram observed in the oscilloscope, it was possible to know the frequency vibration (500 and 1500 Hz) for a cuvette where the microbubble was created.

A Miniaturized Spectrometer Based on Optical Modulator Composed of Grating and Tunable Fabry-Perot

2011 ◽  
Vol 483 ◽  
pp. 447-451
Author(s):  
Nai Ke Wei ◽  
Zhu Gao Ni ◽  
Jun Yao ◽  
Jian Hua Zhu ◽  
Fu Hua Gao
Keyword(s):  
Focal Plane ◽  
Optical Modulator ◽  
Peak Wavelength ◽  
Grating Spectrometer ◽  
Interference Fringes ◽  
Fabry Perot

In this paper an innovative miniaturized spectrometer has been presented. The structure is similar to a grating spectrometer, but its optical modulator is composed of a grating and a tunable Fabry-Perot (FP). The collimated light is diffracted by the grating and filtered by the FP, and interference fringes distribute separately on the focal plane. The position of fringes moves when the FP is tuned, this helps in the scanning and detecting of the peak wavelength of fringes. The principle and characteristics of the spectrometer are discussed in detail.

Measurement of Refractive Indices of Ferroelectric SmC*Liquid Crystal by the Fabry-Perot Interference Method

1989 ◽  
Vol 28 (Part 2, No. 9) ◽  
pp. L1602-L1605 ◽  
Author(s):  
Masahiro Kawaida ◽  
Tomomi Yamaguchi ◽  
Tadashi Akahane
Keyword(s):  
Liquid Crystal ◽  
Interference Method ◽  
Refractive Indices ◽  
Fabry Perot
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