A Versatile Multi-Mode Fabry-Perot Instrument

1976 ◽  
Vol 3 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Michael A. Dopita ◽  
John A. Hart
Keyword(s):  
Refractive Index ◽  
Transmission Coefficient ◽  
Solid Angle ◽  
Fabry Perot ◽  
Spatially Extended ◽  
Multi Mode ◽  
Very High ◽  
Extended Emission

Fabry-Perot instruments have been extensively used for many years for the study of spatially extended emission nebulae because they offer a potential luminosity resolution product (L × Rpot) which exceeds by a high factor tha attainable by aerating spectrometer. Meaburn (1970) shows that this product is given by the relation where P is the number of resolution elements each containing a maximum solid angle, Ω observed simultaneously, ti is the refractive index of the medium between the plates, A is the acceptance area of the device, εo is the transmission coefficient of the associated optics and εF the transmission coefficient of the Fabry-Perot (which if coated with dielectric multilayers can be very high).

scholarly journals Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities

2020 ◽  
Vol 634 ◽  
pp. A111 ◽  
Author(s):  
J. P. U. Fynbo ◽  
P. Møller ◽  
K. E. Heintz ◽  
J. N. Burchett ◽  
L. Christensen ◽  
...  
Keyword(s):  
Emission Line ◽  
Absorption Line ◽  
Emission Lines ◽  
Broad Absorption ◽  
Broad Absorption Line ◽  
Red Edge ◽  
First Case ◽  
Bl Lac ◽  
Spatially Extended ◽  
Extended Emission

We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Si IV, C IV, and Al III, a redshift of z = 2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 Å that is most likely due to Lyman-α emission, which implies a systemic redshift of z = 2.66 if correctly identified. There is also evidence for the onset of Lyman-α forest absorption bluewards of 4450 Å and evidence for Hα emission in the K band consistent with a systemic redshift of z = 2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s−1 to 40 000 km s−1. To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-α emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.

scholarly journals Gold Enhanced Hemoglobin Interaction in a Fabry–Pérot Based Optical Fiber Sensor for Measurement of Blood Refractive Index

2018 ◽  
Vol 36 (4) ◽  
pp. 1118-1124 ◽  
Author(s):  
Charusluk Viphavakit ◽  
Sinead O Keeffe ◽  
Minghong Yang ◽  
Stefan Andersson-Engels ◽  
Elfed Lewis
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Fabry Perot

Highly sensitive refractive index sensor for detection of Hg2+ based on Fano-like resonance in metal-dielectric-metal meta-structure

2021 ◽  
Author(s):  
Shuangxiu Yuan ◽  
Xuebo Sun ◽  
Jing Li ◽  
Yan Li ◽  
Fufang Su ◽  
...  
Keyword(s):  
Refractive Index ◽  
Limit Of Detection ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Large Area ◽  
Amount Of Substance ◽  
Resonance Modes ◽  
Dipole Resonance ◽  
Highly Sensitive ◽  
Fabry Perot

Abstract We experimentally and theoretically investigate Fano-like resonance in large-area Au/SiO2/Au nano-patches meta-structure, which is originating from the coupling between Fabry Perot resonance and magnetic dipole resonance modes. A highly sensitive refractive index sensor based on the lineshape analysis is obtained. The extracted wavelength shift with the amount of substance of Hg2+ changing from 10-3 pmol to 1 nmol has a linear dependence, and the sensitivity can reach to ultra-low limit of detection (LOD) as 10-3 pmol. This study may provide an approach for the development and modification in sensing.

scholarly journals Significant photoinduced refractive index change observed in porous silicon Fabry–Pérot resonators

2000 ◽  
Vol 76 (15) ◽  
pp. 1990-1992 ◽  
Author(s):  
Morio Takahashi ◽  
Yuichi Toriumi ◽  
Takahiro Matsumoto ◽  
Yasuaki Masumoto ◽  
Nobuyoshi Koshida
Keyword(s):  
Refractive Index ◽  
Porous Silicon ◽  
Refractive Index Change ◽  
Index Change ◽  
Fabry Perot

scholarly journals Modified All-Fiber Fabry–Perot Interferometer and Its Refractive Index, Load, and Temperature Analyses

2015 ◽  
Vol 7 (3) ◽  
pp. 1-9 ◽  
Author(s):  
D. Jauregui-Vazquez ◽  
Y. Lopez-Dieguez ◽  
J. M. Sierra-Hernandez ◽  
M. Perez-Maciel ◽  
M. S. Avila-Garcia ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fabry Perot

Multi-mode all Fiber Interferometer based on Fabry-Perot Multi-cavity and its Temperature Response

Optik ◽  
2017 ◽  
Vol 147 ◽  
pp. 232-239 ◽  
Author(s):  
Y. Lopez-Dieguez ◽  
J.M. Estudillo-Ayala ◽  
D. Jauregui-Vazquez ◽  
J.M. Sierra-Hernandez ◽  
L.A. Herrera-Piad ◽  
...  
Keyword(s):  
Temperature Response ◽  
Fabry Perot ◽  
Multi Mode

scholarly journals Optical constants of sputtered beryllium thin films determined from photoabsorption measurements in the spectral range 20.4–250 eV

2020 ◽  
Vol 27 (1) ◽  
pp. 75-82
Author(s):  
Mikhail Svechnikov ◽  
Nikolay Chkhalo ◽  
Alexey Lopatin ◽  
Roman Pleshkov ◽  
Vladimir Polkovnikov ◽  
...  
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Synchrotron Radiation ◽  
Initial Data ◽  
Absorption Coefficient ◽  
Energy Range ◽  
Transmission Coefficient ◽  
Radiation Source ◽  
Optical Constants ◽  
Free Standing

In this work, the refractive index of beryllium in the photon energy range 20.4–250 eV was experimentally determined. The initial data include measurements of the transmittance of two free-standing Be films with thicknesses of 70 nm and 152 nm, as well as reflectometric measurements of similar films on a substrate. Measurements were carried out at the optics beamline of the BESSY II synchrotron radiation source. The absorption coefficient β was found directly from the transmission coefficient of the films, and the real part of the polarizability δ was calculated from the Kramers–Kronig relations. A comparison is carried out with results obtained 20 years ago at the ALS synchrotron using a similar methodology.

Wavelength-Interrogation Fabry–Perot Refractive Index Sensor Based on a Sealed In-Fiber Cavity

2016 ◽  
Vol 28 (1) ◽  
pp. 3-6 ◽  
Author(s):  
Tingting Wang ◽  
Yixian Ge ◽  
Jianhua Chang ◽  
Ming Wang
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Fabry Perot
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