scholarly journals Laser double optical resonance excitation-ionization of Mo with optogalvanic detection

2022 ◽  
Author(s):  
Hu Lu ◽  
Lazaros Varvarezos ◽  
Piergiorgio Nicolosi ◽  
Alberto Andrighetto ◽  
Daniele Scarpa ◽  
...  
Keyword(s):  
Exotic Species ◽  
Hollow Cathode ◽  
Spectroscopic Investigation ◽  
Cost Effective ◽  
Resonance Excitation ◽  
Optical Resonance ◽  
General Domain ◽  
Mode Of Operation ◽  
Isol Facility ◽  
Double Optical Resonance

Abstract We report on measurements of resonant three-step, two-colour ionization of atomic molybdenum, using a hollow cathode lamp (HCL) with optogalvanic detection. Wavelength scans were made for two specific transitions involved in the ionization pathways under investigation, namely 4d5(6S)5s 7S3 - 4d5(6S)5p 7P4 and 4d5(6S)5p 7P4 - 4d5(6S)6d 7D5.So-called ‘slow’ and ‘fast’ optogalvanic signals were observed for each pathway. Results confirm the HCL as a cost effective spectroscopic investigation tool. In particular its use in the optogalvanic mode of operation allows one to precisely, easily and reliably tune the wavelength of one or more lasers to resonances of interest for experiments in the general domain of atomic vapour laser isotope selection (AVLIS). The measurements are closely related to the Selective Production of Exotic Species (SPES) project at the ISOL facility and were performed in the recently established laser laboratory in Legnaro National Laboratories of INFN.

Nanoplasmon coupled intracellular optical resonance excitation for ultrasensitive 3D fluorescence cell imaging

2011 ◽  
Author(s):  
Manas Ranjan Gartia ◽  
Austin Hsiao ◽  
Mayandi Sivaguru ◽  
Yi Chen ◽  
G. Logan Liu
Keyword(s):  
Cell Imaging ◽  
Resonance Excitation ◽  
Optical Resonance

scholarly journals Large-Area Resonance-Tuned Metasurfaces for On-Demand Enhanced Spectroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Masanobu Iwanaga ◽  
Bongseok Choi ◽  
Hideki T. Miyazaki ◽  
Yoshimasa Sugimoto ◽  
Kazuaki Sakoda
Keyword(s):  
Nanoimprint Lithography ◽  
Near Infrared ◽  
Cost Effective ◽  
Silicon On Insulator ◽  
Fine Tuning ◽  
Infrared Range ◽  
Large Area ◽  
Optical Resonance ◽  
Optical Resonances ◽  
Soi Substrates

We show an effective procedure for lateral structure tuning in nanoimprint lithography (NIL) that has been developed as a vertical top-down method fabricating large-area nanopatterns. The procedure was applied to optical resonance tuning in stacked complementary (SC) metasurfaces based on silicon-on-insulator (SOI) substrates and was found to realize structure tuning at nm precision using only one mold in the NIL process. The structure tuning enabled us to obtain fine tuning of the optical resonances, offering cost-effective, high-throughput, and high-precision nanofabrication. We also demonstrate that the tuned optical resonances selectively and significantly enhance fluorescence (FL) of dye molecules in a near-infrared range. FL intensity on a SC metasurface was found to be more than 450-fold larger than the FL intensity on flat Au film on base SOI substrate.

Autler-Townes effect in double optical resonance

1978 ◽  
Vol 25 (3) ◽  
pp. 359-362 ◽  
Author(s):  
H.R. Gray ◽  
C.R. Stroud
Keyword(s):  
Optical Resonance ◽  
Double Optical Resonance

The effect of self-absorption in hollow cathode lamp on its temperature

2014 ◽  
Vol 32 ◽  
pp. 1460349
Author(s):  
Samad Sobhanian ◽  
Hamid Naghshara
Keyword(s):  
Hollow Cathode ◽  
Small Error ◽  
Resonance Absorption ◽  
Main Axis ◽  
Lower State ◽  
Optical Resonance ◽  
Hollow Cathode Lamp ◽  
Gaussian Profile ◽  
Axisymmetric Form

It has been shown experimentally that even a small error in the calculation of the temperature inside the hollow-cathode lamp (HCL) and the current applied to the lamp, may cause a tremendous error in determination of the absorption ratio in optical resonance absorption (ORA) method. This effect is intensified nonlinearity for large absorption ratios. If a higher current is applied to a copper hollow cathode lamp, the copper density inside the lamp is increasing rapidly. Due to the cylindrical (axisymmetric) form of the lamp, the density of atoms around the main axis of the lamp becomes greater than that near the internal wall. In this case the auto-absorption (or self-absorption) is occurred and as its result, the emission spectrum produced by copper atoms is locally absorbed before going out from the lamp. This absorption is stronger near the main axis compared with the areas near the wall because of the Gaussian profile of the spectral line. Two different Cu atoms ground state lines with the similar lower state (327.4 nm and 324.7 nm) are used in this work as optical resonance absorption and the absorption coefficient is obtained for three different pressures (0.6, 4.5 and 14 µbar). The best values for copper HCL temperature and for maximum HCL current were found respectively 450 K, and 5mA.

scholarly journals Doppler-free spectroscopy of the lowest triplet states of helium using double optical resonance

2021 ◽  
Vol 75 (8) ◽  
Author(s):  
Ali Dia ◽  
Marie Abboud ◽  
Pierre-Jean Nacher ◽  
Geneviève Tastevin
Keyword(s):  
Triplet States ◽  
Optical Resonance ◽  
Double Optical Resonance

scholarly journals UXO detection and identification based on intrinsic target polarizabilities — A case history

Geophysics ◽  
2009 ◽  
Vol 74 (1) ◽  
pp. B1-B8 ◽  
Author(s):  
Erika Gasperikova ◽  
J. Torquil Smith ◽  
H. Frank Morrison ◽  
Alex Becker ◽  
Karl Kappler
Keyword(s):  
Electromagnetic Induction ◽  
Current Practice ◽  
Cost Effective ◽  
Scrap Metal ◽  
Training Data ◽  
Time Dependent ◽  
Unexploded Ordnance ◽  
Data Set ◽  
Detection And Identification ◽  
Mode Of Operation

Electromagnetic induction data parameterized in time-dependent object intrinsic polarizabilities can discriminate unexploded ordnance (UXO) from false targets (scrap metal). Data from a cart-mounted system designed to discriminate UXO of [Formula: see text] in diameter are used. Discriminating UXO from irregular scrap metal is based on the principal dipole polarizabilities of a target. Nearly intact UXO displays a single major polarizability coincident with the long axis of the object and two equal, smaller transverse polarizabilities, whereas metal scraps have distinct polarizability signatures that rarely mimic those of elongated symmetric bodies. Based on a training data set of known targets, objects were identified by estimating the probability that an object is a single UXO. Our test survey took place on a military base where [Formula: see text] mortar shells and scrap metal were present. We detected and correctly discriminated all [Formula: see text] mortars, and in that process we added 7% and 17%, respectively, of dry holes (digging scrap) to the total number of excavations in two different survey modes. We also demonstrated a mode of operation that might be more cost effective than current practice.

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