Holographic microscope with twins laser beams: A novel conceptual set-up for a multifunctional tool in biophotonics

2011 ◽  
Author(s):  
P. Memmolo. M. Paturzo ◽  
A. Finizio ◽  
P. Ferraro
Keyword(s):  
Laser Beams ◽  
Set Up

Harmonic generation by the propagation of two-colour laser beams in an underdense plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 933-938 ◽  
Author(s):  
PALLAVI JHA ◽  
NIRMAL KUMAR VERMA ◽  
AKANKSHA SAROCH
Keyword(s):  
Laser Beams ◽  
Harmonic Amplitude ◽  
Arbitrary Integer ◽  
Third Harmonic ◽  
The Third ◽  
Fundamental Frequencies ◽  
Linearly Polarized ◽  
Colour System ◽  
Set Up ◽  
Underdense Plasma

AbstractAn analytical theory is developed for studying the phenomenon of generation of efficient odd and even high harmonics by the propagation of two-colour linearly polarized laser beams in a homogeneous underdense plasma. The wave equation governing the evolution of the amplitude of various harmonics driven by the current density at corresponding frequencies is set up. The ratio of the fundamental frequencies of the two laser beams is considered to be an arbitrary integer. A numerical evaluation of amplitudes of the third, fourth and fifth harmonics has been presented. It is seen that the third harmonic amplitude generated by the two-colour system is enhanced in comparison to that obtained by a single laser beam. The detuning distance for the former is also increased in comparison to the latter case.

Directional Spectral Emittance of a Packed Bed: Influence of the Temperature Gradient in the Medium

2002 ◽  
Vol 124 (5) ◽  
pp. 904-911 ◽  
Author(s):  
Dominique Baillis ◽  
Jean-Franc¸ois Sacadura
Keyword(s):  
Temperature Gradient ◽  
Temperature Profile ◽  
Isothermal Condition ◽  
Packed Bed ◽  
Laser Beams ◽  
Power Laser ◽  
Temperature Nonuniformity ◽  
Spectral Emittance ◽  
The Face ◽  
Set Up

Recently a new experimental set-up for measuring the directional spectral emittance has been developed. Both sides of packed opaque spheres are simultaneously heated with identical power laser beams (CO2 10.6 μm) and the isothermal condition in the medium is assumed. In this paper we consider the coupled conduction-radiation equations to investigate the effect of the temperature nonuniformity on the calculated value of the emittance and to verify if the isothermal assumption is valid. Moreover, the sensitivity of the emittance and the temperature profile to the values of parameters (such as the porosity, the face temperatures, and the particle hemispherical reflectivity, etc.) is studied.

scholarly journals Modulation instability of two laser beams in plasma

2013 ◽  
Vol 31 (4) ◽  
pp. 753-758 ◽  
Author(s):  
Vijay Singh
Keyword(s):  
Growth Rate ◽  
Phase Modulation ◽  
Wave Equations ◽  
Modulation Instability ◽  
Group Velocity Dispersion ◽  
Laser Beams ◽  
Homogeneous Plasma ◽  
Single Beam ◽  
Linearly Polarized ◽  
Set Up

AbstractIn the present paper, spatial amplitude modulation instability arising due to relativistic self-phase modulation and relativistic cross phase modulation of two co-propagating, linearly polarized laser beams (with arbitrary relative polarization) interacting with homogeneous plasma, has been studied. Wave equations including finite perturbation length effects, group velocity dispersion, and coupled nonlinear source term have been set up. Coupled dispersion relation for the two laser beams has been derived and solved numerically. The growth rate of modulation instability has been obtained and compared with the growth rate of a single beam propagating in homogeneous plasma. It has been shown that modulation instability of a single beam may either be enhanced or suppressed by co-propagation of another laser beam having appropriate polarization.

scholarly journals Development of gravitational acceleration measurement set up based on laser beams

2021 ◽  
Vol 7 (1) ◽  
pp. 163-167
Author(s):  
Sadhan Chandra Das ◽  
Sagnik Das ◽  
Nandkishor Ghodke ◽  
Sumant Katiyal ◽  
Abhijit Majumdar
Keyword(s):  
Laser Beams ◽  
Gravitational Acceleration ◽  
Acceleration Measurement ◽  
Set Up

scholarly journals Optical set-up for dynamic superposition of three laser beams for structuring and polishing applications

2014 ◽  
Vol 22 (2) ◽  
pp. 1387 ◽  
Author(s):  
André Temmler ◽  
Oliver Pütsch ◽  
Jochen Stollenwerk ◽  
Edgar Willenborg ◽  
Peter Loosen
Keyword(s):  
Laser Beams ◽  
Set Up

scholarly journals Development of gravitational acceleration measurement set up based on laser beams

2021 ◽  
Vol 7 (1) ◽  
pp. 110-114
Author(s):  
Sadhan Chandra Das ◽  
Sagnik Das ◽  
Nandkishor Ghodke ◽  
Sumant Katiyal ◽  
Abhijit Majumdar
Keyword(s):  
Laser Beams ◽  
Gravitational Acceleration ◽  
Acceleration Measurement ◽  
Set Up

scholarly journals Effect of cross focusing of two laser beams on the growth of laser ripple in plasma

2003 ◽  
Vol 21 (4) ◽  
pp. 567-572 ◽  
Author(s):  
GUNJAN PUROHIT ◽  
H.D. PANDEY ◽  
R.P. SHARMA
Keyword(s):  
Laser Beam ◽  
Numerical Solution ◽  
Intensity Distribution ◽  
Laser Plasma ◽  
Dynamical Equation ◽  
Ponderomotive Force ◽  
Laser Beams ◽  
Plasma Parameters ◽  
Set Up

This article presents an effect of cross focusing of two laser beams on the growth of a laser ripple in laser-produced plasmas. The mechanism of nonlinearity is assumed to be ponderomotive force, arising because of the Gaussian intensity distribution of the laser beams. The dynamical equation governing the laser ripple intensity has been set up and a numerical solution has been presented for typical laser plasma parameters. It is found that the change in the intensity of the second laser beam can affect the growth of the laser ripple significantly.

scholarly journals Development of gravitational acceleration measurement set up based on laser beams

2021 ◽  
Vol 7 (1) ◽  
pp. 110-114
Author(s):  
Sadhan Chandra Das ◽  
Sagnik Das ◽  
Nandkishor Ghodke ◽  
Sumant Katiyal ◽  
Abhijit Majumdar
Keyword(s):  
Laser Beams ◽  
Gravitational Acceleration ◽  
Acceleration Measurement ◽  
Set Up

Laser Interference Structuring of a-Si:H

1996 ◽  
Vol 420 ◽  
Author(s):  
C. E. Nebel
Keyword(s):  
Solar Cell ◽  
Electric Fields ◽  
Light Trapping ◽  
Window Layer ◽  
Laser Beams ◽  
Laser Interference ◽  
Hybrid Thin Film ◽  
Boron Doped ◽  
Cell Architecture ◽  
Set Up

AbstractLaser interference structuring with a pulsed Nd:YAG laser set-up is introduced and typical geometric dimensions and limitations are discussed. Intensity modulated laser beams are used to recrystallize amorphous silicon layers periodically at the intensity maxima. Stripe or tip structures of multi-crystalline (mc) silicon with sub-micrometer dimensions are shown. Structural, electronic and optical properties of the mc-Si structures are discussed. A hybrid thin film p-i-n solar cell architecture is described where the textured TCO is replaced by a flat TCO and a laterally structured boron doped mc-Si window layer. Light trapping, light diffraction and higher internal electric fields are proposed to be the main advantages of such a solar cell.

The Effects of Drying Techniques on Clay-Rich Soil Texture

1974 ◽  
Vol 32 ◽  
pp. 466-467
Author(s):  
T. G. Naymik
Keyword(s):  
Critical Point ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Drying Methods ◽  
Air Drying ◽  
Freeze Dried ◽  
Critical Point Drying ◽  
Set Up ◽  
The Relationship ◽  
Quartz Grains

Three techniques were incorporated for drying clay-rich specimens: air-drying, freeze-drying and critical point drying. In air-drying, the specimens were set out for several days to dry or were placed in an oven (80°F) for several hours. The freeze-dried specimens were frozen by immersion in liquid nitrogen or in isopentane at near liquid nitrogen temperature and then were immediately placed in the freeze-dry vacuum chamber. The critical point specimens were molded in agar immediately after sampling. When the agar had set up the dehydration series, water-alcohol-amyl acetate-CO2 was carried out. The objectives were to compare the fabric plasmas (clays and precipitates), fabricskeletons (quartz grains) and the relationship between them for each drying technique. The three drying methods are not only applicable to the study of treated soils, but can be incorporated into all SEM clay soil studies.

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