Mode-Mismatched Dual-Beam Differential Thermal Lensing with Optical Scheme Design Optimized Using Expert Estimation for Analytical Measurements

2008 ◽  
Vol 62 (4) ◽  
pp. 439-449 ◽  
Author(s):  
Mikhail A. Proskurnin ◽  
Mikhail E. Volkov
Keyword(s):  
Thermal Lensing ◽  
Optical Scheme ◽  
Scheme Design ◽  
Analytical Measurements ◽  
Expert Estimation ◽  
Dual Beam

scholarly journals Thermal Lensing Spectroscopy With Picosecond Pulse Trains and a New Dual Beam Configuration

1982 ◽  
Vol 1 (1) ◽  
pp. 9-15 ◽  
Author(s):  
J. W. Perry ◽  
E. A. Ryabov ◽  
A. H. Zewail
Keyword(s):  
Picosecond Pulse ◽  
Thermal Lensing ◽  
Pulse Trains ◽  
Dual Beam

Optimization of Instrumental Parameters of a Near-Field Thermal-Lens Detector for Capillary Electrophoresis

2005 ◽  
Vol 59 (12) ◽  
pp. 1470-1479 ◽  
Author(s):  
Mikhail A. Proskurnin ◽  
Svetlana N. Bendrysheva ◽  
Nataliya Ragozina ◽  
Stefan Heissler ◽  
Werner Faubel ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Thermal Lens ◽  
Near Field ◽  
Field Measurements ◽  
Excitation Source ◽  
Low Flow ◽  
Optical Scheme ◽  
Multimode Laser ◽  
Dual Beam ◽  
Static Conditions

The optical scheme of a near-field dual-beam mode-mismatched thermal-lens detector for capillary electrophoresis with a crossed-beam configuration employing a multimode HeCd laser (325 nm) as an excitation source was optimized. It is shown that a multimode laser can be successfully used as an excitation source in thermal lensing with minimal deviations in thermal responses from Gaussian excitation sources. An equation for diffraction thermal-lens theory for near-field measurements is deduced, and the experimental results agree with the deduced equation. The temperature rise in the capillary was estimated, and the exponential decrease of the signal with time for static conditions and low flow velocities was explained. The optimum configuration of the detector from the viewpoint of the maximum sensitivity and beam sizes was found. The detector provides a significant improvement in the detection limits for model compounds absorbing at 325 nm (nitrophenols) compared to the results obtained with a commercial absorbance detector operating at the same wavelength.

Green Synthesized Plasmonic Silver Systems for Potential Non-Linear Optical Applications: Optical Limiting and Dual Beam Mode Matched Thermal Lensing

2019 ◽  
Vol 72 (6) ◽  
pp. 460 ◽  
Author(s):  
Jeena Thomas ◽  
Prakash Perikaruppan ◽  
Vinoy Thomas ◽  
Jancy John ◽  
Raji Mary Mathew ◽  
...  
Keyword(s):  
Bioactive Compound ◽  
Optical Limiting ◽  
Thermal Lensing ◽  
Optical Parameters ◽  
Dual Beam ◽  
Optic Property ◽  
Non Linear ◽  
Linear Optical ◽  
Beam Mode ◽  
Limiting Threshold

Bioactive compound functionalized plasmonic systems are evolving as a promising branch of nanotechnology. In this communication the synthesis of bioactive compound mimosine-based silver nanoparticles (AgNPs) and their non-linear optical and thermo-optic properties are presented. UV-Visible spectroscopy, optical bandgap measurement, fluorescence spectroscopy, and high-resolution transmission electron microscopy (HRTEM) techniques were used to characterize the synthesized AgNPs. An open aperture z-scan technique was used to determine the non-linear optical parameters. A very strong reverse saturable absorption (RSA) and low optical limiting threshold were observed for the present mimosine decorated AgNP system. The thermo-optic property of the present system was evaluated using a highly sensitive dual beam mode matched thermal lensing spectroscopic technique. A comparison of the low limiting threshold (242MWcm−2) and thermo-optic property (thermal diffusivity, D=1.13×10−7m2s−1) with similar systems proves its capability for non-linear optical and thermo-optic applications.

Differential Dual-Beam Thermal Lensing Spectrometry: Determination of Lanthanides

1987 ◽  
Vol 41 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Thierry Berthoud ◽  
Nathalie Delorme
Keyword(s):  
Index Of Refraction ◽  
Lanthanide Ions ◽  
Thermal Lensing ◽  
Excitation Beam ◽  
Dual Beam ◽  
Carbonate Medium ◽  
Excitation Laser ◽  
Lensing Effect ◽  
Thermal Lensing Effect

This paper describes a differential dual-beam thermal lensing setup which involves two continuous lasers and two cells placed one just behind the other on the beampath. A tunable excitation laser creates the thermal lensing effect in the two cells, whereas the (He-Ne) laser, colinear to the excitation beam, probes the variation of the index of refraction due to the absorption in each cell. The differential response is achieved by placing the solvent in the first cell and the solvent with analyte in the second cell. The positions of the two cuvettes are optimized in order to maximize differential thermal lensing effect detection. This differential instrument allows compensation of 95–98% of the thermal lensing solvent effect. Thermal lensing spectra of two lanthanide ions (Nd3+, Pr3+), both in no complexing solution (HClO4) and in carbonate medium, are discussed. Analytical determinations of these elements with detection limits in the range of 10−6 mole per liter are observed.

Nonlinear optical limiting and dual beam mode matched thermal lensing of nano fluids containing green synthesized copper nanoparticles

2019 ◽  
Vol 279 ◽  
pp. 63-66 ◽  
Author(s):  
Jancy John ◽  
Raji Mary Mathew ◽  
I. Rejeena ◽  
R. Jayakrishnan ◽  
S. Mathew ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Thermal Lensing ◽  
Dual Beam ◽  
Beam Mode ◽  
Nano Fluids

Beam geometry optimization in dual-beam thermal lensing spectrometry

1985 ◽  
Vol 57 (7) ◽  
pp. 1216-1219 ◽  
Author(s):  
Thierry. Berthoud ◽  
Nathalie. Delorme ◽  
Patrick. Mauchien
Keyword(s):  
Geometry Optimization ◽  
Thermal Lensing ◽  
Beam Geometry ◽  
Dual Beam

The expert estimation based analysis of the EEG acoustic image in bioacoustic corrections

2012 ◽  
Author(s):  
K. V. Konstantinov ◽  
M. K. Leonova ◽  
D. B. Miroshnikov ◽  
K. K. Konstantinova ◽  
T. V. Avaliani
Keyword(s):  
Acoustic Image ◽  
Expert Estimation

Increasing the information capacity of a fiber-optic multi-sensor converter of binary mechanical signals into electrical signals

2020 ◽  
pp. 15-23
Author(s):  
V. M. Grechishnikov ◽  
E. G. Komarov
Keyword(s):  
Fiber Optic ◽  
Information Capacity ◽  
Parallel Structure ◽  
Optical Scheme ◽  
Digital To Analog Converter ◽  
Electrical Signals ◽  
Mechanical Signals ◽  
Analog Converter ◽  
Output Code ◽  
Digital To Analog

The design and operation principle of a multi-sensor Converter of binary mechanical signals into electrical signals based on a partitioned fiber-optic digital-to-analog Converter with a parallel structure is considered. The digital-to-analog Converter is made from a set of simple and technological (three to five digit) fiber-optic digital-to-analog sections. The advantages of the optical scheme of the proposed. Converter in terms of metrological and energy characteristics in comparison with single multi-bit converters are justified. It is shown that by increasing the number of digital-analog sections, it is possible to repeatedly increase the information capacity of a multi-sensor Converter without tightening the requirements for its manufacturing technology and element base. A mathematical model of the proposed Converter is developed that reflects the features of its operation in the mode of sequential time conversion of the input code vectors of individual fiber-optic sections into electrical analogues and the formation of the resulting output code vector.

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