Tunable Si photodiode with integrated Fabry-Perot interference filter

1981 ◽  
Author(s):  
T. K. Plant ◽  
G. Petrie
Keyword(s):  
Interference Filter ◽  
Fabry Perot

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.

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.

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.

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 Fabry–Perot interferometer as a solar background noise suppressor: application to daytime lidar

2012 ◽  
Vol 55 (2) ◽  
Author(s):  
Karnam Raghunath ◽  
Karnam Ramesh ◽  
Sanama Narayana Reddy
Keyword(s):  
Background Noise ◽  
Noise Suppression ◽  
Performance Indicator ◽  
Signal To Noise Ratio ◽  
Interference Filter ◽  
Signal To Noise ◽  
Night Time ◽  
Fabry Perot ◽  
Noise Ratio ◽  
Identical Test

<p>Continuous atmospheric probing by a lidar is a requirement for many applications. However, due to high solar background noise during the daytime, lidar operations are mostly restricted to night-time. While many techniques are in practice, like reducing the receiver field of view, changing the view angle, introducing a narrow band Interference Filter (IF), these are applied to circumvent problems, rather than to suppress the noise. Using a Fabry-Perot interferometer as a narrow passband filter for solar background noise suppression is a known technique, and its potential is exploited in our system. An optical-fiber-coupled lidar system with its transmitter injection seeded was developed and has been operated during the daytime at Gadanki (13.6˚N, 79.2˚ E). The signal-to-noise ratio of the return signal is used as the performance indicator, to evaluate the improvements. Signal-to-noise ratios with and without the Fabry-Perot interferometer are measured with near identical test set-ups. The signal-to-noise ratio enhancement factor is ca. 4, in agreement with the theoretical value. The performance is compared when the receiver fields of view are changed.</p>

Ultra-narrow angle-tunable Fabry–Perot bandpass interference filter for use as tuning element in infrared lasers

2014 ◽  
Vol 67 ◽  
pp. 432-435 ◽  
Author(s):  
Jan Kischkat ◽  
Sven Peters ◽  
Mykhaylo P. Semtsiv ◽  
Tristan Wegner ◽  
Mikaela Elagin ◽  
...  
Keyword(s):  
Interference Filter ◽  
Infrared Lasers ◽  
Narrow Angle ◽  
Fabry Perot ◽  
Tuning Element

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.

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