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.

Improved Interference Filter Structures Made of Porous Silicon

1996 ◽  
Vol 452 ◽  
Author(s):  
M. Thönissen ◽  
M. G. Berger ◽  
M. Krüger ◽  
W. Theiβ ◽  
S. Hilbrich ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Interference Filter ◽  
Refractive Indices ◽  
Bragg Reflectors ◽  
Continuous Change ◽  
Specific Design ◽  
Fabry Perot ◽  
Current Densities ◽  
Substrate Doping ◽  
Filter Structures

AbstractRecently passive optical devices like filter structures or waveguides based on porous silicon have attracted high interest due to their easy and cheap fabrication. We have formed interference filters using porous silicon by changing the current density during formation. For the specific design of these filter structures a calibration of the etch rate and the refractive indices is required. Therefore we have determined the effective dielectric function for different substrate doping levels and anodization current densities by fitting reflectance spectra. Based on these results different kinds of reflectance filters consisting of discrete layers (Bragg reflectors, Fabry-Perot filters) as well as filters with a continuous change of the refractive indices with depth (rugate-filters) can be realised. Furthermore we present applications of these filter structures such as anti-reflectance coatings and high quality mirrors.

scholarly journals IX.—Researches on Heat. Third Series. § 1. On the unequally Polarizable Nature of different kinds of Heat. § 2. On the Depolarization of Heat. §; 3. On the Refrangibility of Heat

1839 ◽  
Vol 14 (1) ◽  
pp. 176-207
Author(s):  
James D. Forbes
Keyword(s):  
Refractive Indices ◽  
The Third ◽  
The Past ◽  
Made In ◽  
Past Winter

1. The following paper is divided into three sections, containing three distinct yet intimately connected investigations. The two first on the Polarizability and Depolarization of Heat have arisen immediately out of the train of investigation contained in my two former papers, and the researches of others to which they gave rise. The third is on the Refrangibility of Heat, a point of the highest importance for theory.2. The experiments on which these investigations are based have been performed almost exclusively during the past winter. Part of the experiments on Depolarization were, however, made in the winter 1836-7. The mode adopted for trying Refractive Indices I had long ago contemplated. It was not, however, put in practice until January last.

Tunable erbium doped fiber laser based on a spherical micro-ball lens as a Fabry–Perot interference filter

Laser Physics ◽  
2021 ◽  
Vol 31 (3) ◽  
pp. 033001
Author(s):  
C E Bender-Pérez ◽  
A A Castillo-Guzmán ◽  
R I Alvarez-Tamayo
Keyword(s):  
Fiber Laser ◽  
Interference Filter ◽  
Erbium Doped ◽  
Fabry Perot

A Simple and Reliable Dye Laser System for Spectroscopic Investigations

1972 ◽  
Vol 27 (4) ◽  
pp. 601-604b ◽  
Author(s):  
J. Kühl ◽  
G. Marowksy ◽  
P. Kunstmann ◽  
W. Schmidt
Keyword(s):  
Spectral Density ◽  
Narrow Band ◽  
Laser System ◽  
Interference Filter ◽  
Dye Laser ◽  
Quartz Plate ◽  
Simple System ◽  
Low Loss ◽  
Spectral Narrowing ◽  
Fabry Perot

Abstract Efficient spectral narrowing and accurately reproducible tuning of a dye laser has been achieved by the combination of a low-loss narrow-band interference filter and a solid-quartz-plate-Fabry-Perot-etalon. Bandwidths as small as 5-10-3 Å were obtained by this simple system increasing the spectral density by a factor of at least 2 · 103.

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.

scholarly journals Messung der Ionentemperatur mit Hilfe des thermischen Doppler-Effekts an einer Wasserstoff-Lichtbogenentladung

1970 ◽  
Vol 25 (4) ◽  
pp. 473-481 ◽  
Author(s):  
D. Ludwig ◽  
J. Raeder
Keyword(s):  
Doppler Effect ◽  
Axial Magnetic Field ◽  
Transmission Band ◽  
Interference Filter ◽  
Half Width ◽  
Spectral Lines ◽  
Ion Temperature ◽  
Strong Reduction ◽  
Radial Profiles ◽  
Fabry Perot

AbstractThe radial ion temperature distribution in a 2600 amp hydrogen arc in a 30 kG axial magnetic field was measured spectroscopically with a Fabry-Perot interferometer by evaluating the half width of Doppler broadened carbon lines. As the admixture of methane had to be low, in order to prevent a strong reduction of the temperature on the axis, the intensities of the C III and C IV lines were relatively weak. Consequently an interference filter with narrow transmission band width was used instead of a spectrograph in front of the F.-P.-interferometer. The broadening of the spectral lines, which were used for measurement, was caused mainly by the thermal Doppler effect. The rotation of the plasma and the macroscopical Doppler effect resulting therefrom did not disturb the measurements. The ion temperature, which was found to be 1.4 × 105 °K on the axis, was determined from the half width of the profiles of a C III spectral line. Since the discharge was observed side-on, the measured integrated values were reduced to radial profiles by using appropriate inversion formulae.

Revisiting the innermost kinematics of M31 galaxy with the OMM Fabry-Perot interferometer

2019 ◽  
Vol 14 (S353) ◽  
pp. 130-133
Author(s):  
Sié Zacharie Kam ◽  
Claude Carignan ◽  
Michel Marcelin ◽  
Philippe Amram ◽  
Jean Koulidiati
Keyword(s):  
Rotation Curve ◽  
Narrow Band ◽  
Optical Emission ◽  
Emission Lines ◽  
Interference Filters ◽  
Andromeda Galaxy ◽  
Fabry Perot ◽  
The Galaxy ◽  
Data Points ◽  
Made In

AbstractWe present observations on optical emission lines acquired with the scanning Fabry-Perot interferometer of the observatoire du Mont Mégantic, of the Andromeda galaxy (M31). A 765 order Fabry-Perot were used with a fast readout EM-CCD. From data obtained, kinematic maps and data points for the rotation curve of the innermost part of the galaxy are derived. Several dozen of regions have been scanned with the Fabry-Perot interferometer and narrow band interference filters. The central 10’x10’ were scanned with five different filters. Observations have been made in order to get better Hα data for kinematics purposes.

On the Eclipse E-Corona Observations by the Fabry-Perot Technique

1994 ◽  
Vol 144 ◽  
pp. 549-553 ◽  
Author(s):  
I. S. Kim ◽  
R. N. Smartt
Keyword(s):  
Near Infrared ◽  
Infrared Emission ◽  
Interference Filter ◽  
Point Of View ◽  
Velocity Measurements ◽  
Coronal Emission ◽  
Advantages And Disadvantages ◽  
Fabry Perot ◽  
Field Velocity ◽  
Near Infrared Emission

AbstractInterpretations of the eclipse Fabry-Perot interferograms obtained by different authors are compared particularly in point of view of velocity measurements. Advantages and disadvantages of the instrumentation consisting of a Fabry-Perot etalon and a narrow band interference filter are discussed when a coronal emission is imposed on steep gradient coronal continuum. A list of optical and near infrared emission coronal lines is analyzed and a recommendation for employment of the Fe XIV (5303Å) and Fe XI (7892Å) is given. An optical sketch of the Fabry-Perot instrumentation is suggested. It allows to select both the instrumental and coronal continuum contributions to get reliable data on the field velocity.

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