Investigations of non-linear absorption of q-switching saturable absorbers and determination of their main parameters

2014 ◽  
Author(s):  
J. Mlynczak ◽  
K. Kopczynski ◽  
N. Belghachem
Keyword(s):  
Linear Absorption ◽  
Saturable Absorbers ◽  
Q Switching ◽  
Non Linear

Investigations of Non-Linear Absorption of Q-Switching Saturable Absorbers and Determination of their Main Parameters

2015 ◽  
Vol 230 ◽  
pp. 193-198
Author(s):  
Jaroslaw Mlynczak ◽  
Krzysztof Kopczynski ◽  
Nabil Belghachem
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Excited State Absorption ◽  
Absorption Cross ◽  
Ground State Absorption ◽  
Linear Absorption ◽  
Saturable Absorbers ◽  
Q Switching ◽  
Non Linear

Investigations of non-linear absorption of q-switching absorbers were carried out. Three types of saturable absorbers were examined (Cr4+:YAG at the wavelength of 1064 nm, V3+:YAG and Co2+:YAG at the wavelength of 1332 nm) and their principal parameters were estimated. To appropriately determine these parameters 48 samples of Cr4+:YAG, 42 samples of V3+:YAG and 26 samples of Co2+:YAG were investigated making the results more reliable. Three different models of analysis of saturation effect were described and the best one chosen. Using the best model for the analysis the main parameters of the saturable absorbers were determined. On the basis of so many samples the standard deviation of the ground state absorption cross section, the excited state absorption cross section and the unsaturable losses were calculated showing how the value of these parameters may differ even for the same type of crystal.

Investigation of nonlinear absorption in YAP and YAG single crystals doped with Co and co-doped with Si

2009 ◽  
Vol 17 (2) ◽  
Author(s):  
A. Bajor ◽  
J. Kisielewski ◽  
K. Kopczyński ◽  
T. Łukasiewicz ◽  
J. Mierczyk ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystals ◽  
Nonlinear Absorption ◽  
Linear Absorption ◽  
Q Switching ◽  
Non Linear ◽  
Laser Systems ◽  
New Material ◽  
Co Doped

AbstractSince our attempts to grow YAP:Co,Si non-linear absorbers have failed, we switched to Czochralski grown YAGs doped with the same ions. This time, however, the new material was found to exhibit excellent, non-linear absorption, which can be used directly in Q-switching elements in laser systems. In this work we report on technology of YAG single crystals doped with Co and Si, their optical properties, and, finally, on their non-linear absorption. An explanation on why the YAPs were found to be inefficient in non-linear absorption was also provided.

Oligooxyethylene liquid phthalocyanines

2000 ◽  
Vol 04 (05) ◽  
pp. 518-524 ◽  
Author(s):  
ARTHUR W. SNOW ◽  
JAMES S. SHIRK ◽  
RICHARD G. S. PONG
Keyword(s):  
Optical Properties ◽  
Absorption Coefficient ◽  
Visible Region ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Saturable Absorbers ◽  
Optical Limiter ◽  
Volatile Liquid ◽  
Non Linear ◽  
Linear Optical Properties

A series of methyl-terminated oligooxyethylene ( CH 3( OCH 2 CH 2)n O , n = 8.8)-substituted phthalocyanines with peripheral substitution at four β positions, at four α positions and at the eight α positions was synthesized and structurally characterized. These compounds are isotropic liquids above 10 °C. Non-linear optical properties of the tetra-α- and tetra-β-substituted compounds were examined. Both are reverse saturable absorbers in the visible region of the spectrum, but the tetra-α-substituted compound has the larger non-linear absorption coefficient and can be a useful optical limiter in cases where a non-volatile liquid is desirable.

Determination of Concrete Cube Strength from Used Samples / Určení Krychelné Pevnosti Betonu U Použitých Zkušebních Trámců

2012 ◽  
Vol 12 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Oldřich Sucharda ◽  
David Mikolášek ◽  
Jiří Brožovský
Keyword(s):  
Compressive Strength ◽  
Concrete Beams ◽  
Linear Analysis ◽  
Bending Tests ◽  
Cube Strength ◽  
Non Linear ◽  
Compressive Strength Of Concrete ◽  
Concrete Cube

Abstract This paper deals with the determination of compressive strength of concrete. Cubes, cylinders and re-used test beams were tested. The concrete beams were first subjected to three-point or fourpoint bending tests and then used for determination of the compressive strength of concrete. Some concrete beams were reinforced, while others had no reinforcement. Accuracy of the experiments and calculations was verified in a non-linear analysis.

scholarly journals Bias Truck Tire Deformation Analysis with Finite Element Modeling

2020 ◽  
Vol 10 (12) ◽  
pp. 4326
Author(s):  
Józef Pelc
Keyword(s):  
Incompressible Material ◽  
Axisymmetric Deformation ◽  
Thermal Shrinkage ◽  
Deformation Analysis ◽  
Truck Tire ◽  
Non Linear ◽  
Strain Relationship ◽  
Tire Modeling ◽  
Total Lagrangian Formulation

This paper presents a method for modeling of pneumatic bias tire axisymmetric deformation. A previously developed model of all-steel radial tire was expanded to include the non-linear stress–strain relationship for textile cord and its thermal shrinkage. Variable cord density and cord angle in the cord-rubber bias tire composite are the major challenges in pneumatic tire modeling. The variabilities result from the tire formation process, and they were taken into account in the model. Mechanical properties of the composite were described using a technique of orthotropic reinforcement overlaying onto isotropic rubber elements, treated as a hyperelastic incompressible material. Due to large displacements, the non-linear problem was solved using total Lagrangian formulation. The model uses MSC.Marc code with implemented user subroutines, allowing for the description of the tire specific properties. The efficiency of the model was verified in the simulation of mounting and inflation of an actual bias truck tire. The shrinkage negligence effect on cord forces and on displacements was examined. A method of investigating the influence of variation of cord angle in green body plies on tire apparent lateral stiffness was proposed. The created model is stabile, ensuring convergent solutions even with large deformations. Inflated tire sizes predicted by the model are consistent with the actual tire sizes. The distinguishing feature of the developed model from other ones is the exact determination of the cord angles in a vulcanized tire and the possibility of simulation with the tire mounting on the rim and with cord thermal shrinkage taken into account. The model may be an effective tool in bias tire design.

scholarly journals Determination of non-linear refractive index of laser crystals and ceramics via different optical techniques

2020 ◽  
Vol 8 ◽  
pp. 100065
Author(s):  
Laurent Lamaignère ◽  
Guido Toci ◽  
Barbara Patrizi ◽  
Matteo Vannini ◽  
Angela Pirri ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Techniques ◽  
Linear Refractive Index ◽  
Non Linear ◽  
Laser Crystals
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