New organic nonlinear optical materials: dithienylethylenes

2001 ◽  
Vol 708 ◽  
Author(s):  
B. Sahraoui ◽  
K.J. Pluciński ◽  
I. V. Kityk ◽  
B. Paci ◽  
P. Baldeck ◽  
...  
Keyword(s):  
Optical Materials ◽  
Optical Power ◽  
Laser Pulses ◽  
Visible Range ◽  
Nanosecond Laser ◽  
Wave Mixing ◽  
Third Order ◽  
Nanosecond Laser Pulses ◽  
Optical Power Limiting ◽  
532 Nm

ABSTRACTMeasurements of the third-order susceptibilities of new dithienylethylenes in solutions using a degenerate four wave mixing technique at λ=532 nm in picosecond regime were made. From these measurements we deduced the second order hyperpolarizabilities. Optical power limiting properties of the mentioned compounds using nanosecond laser pulses in the visible range are evaluated. The dispersion of nonlinear absorption coefficients is obtained. The appropriate quantum chemical calculations are carried out.

Optical limiting properties of BODIPY dyes substituted with styryl or vinylene groups on the nanosecond timescale

2019 ◽  
Vol 23 (07n08) ◽  
pp. 701-717 ◽  
Author(s):  
Nobuhle Ndebele ◽  
Zweli Hlatshwayo ◽  
Bokolombe P. Ngoy ◽  
Gugu Kubheka ◽  
John Mack ◽  
...  
Keyword(s):  
Thin Films ◽  
Absorption Coefficient ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Nanosecond Laser ◽  
Third Order ◽  
The Third ◽  
Nanosecond Laser Pulses ◽  
532 Nm ◽  
Order Susceptibility

The results of recent studies on the optical limiting properties of BODIPY dyes at 532 and 1064 nm are described and compared. The optical limiting properties of novel 1,7-dimethyl-3,5-di-4-dihydroxyborylstyryl- and 3,5,7-tristyryl-1-methyl-BODIPY dyes were studied in CH2Cl2 and C6H6 and polystyrene thin films using the open aperture Z-scan technique at 532 nm with nanosecond laser pulses to provide an example of how the effective nonlinear absorption coefficient, the third order susceptibility, hyperpolarizability and limiting thresholds can be calculated.

Third-Order Nonlinear Optical Properties of InN Thin Films Under 532 nm Nanosecond Laser Pulses

2017 ◽  
Vol 17 (2) ◽  
pp. 1460-1463
Author(s):  
Jin-Ying Wang ◽  
Zhe-Ming Jin ◽  
Ke-Xin Sun ◽  
Jin-Ding Sun ◽  
Cheng-Bao Yao ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Laser Pulses ◽  
Nonlinear Optical Properties ◽  
Nanosecond Laser ◽  
Third Order ◽  
Nanosecond Laser Pulses ◽  
532 Nm

Metal Organic Complexes for Optical Power Limiting

1994 ◽  
Vol 374 ◽  
Author(s):  
Chris M. Lawson ◽  
Tianyi Zhai ◽  
David C. Gale ◽  
Gary M. Gray
Keyword(s):  
Optical Power ◽  
Four Wave Mixing ◽  
Phosphine Ligands ◽  
Coordination Geometry ◽  
Wave Mixing ◽  
Phosphine Complexes ◽  
Organic Complexes ◽  
Metal Organic ◽  
Optical Power Limiting ◽  
532 Nm

AbstractNonlinear optical properties of transition metal-phosphine complexes have been measured at 532 nm by degenerate four-wave mixing. Large second-order molecular hyperpolarizabilities, γ, have been found for complexes containing two phosphine ligands. The measured γ values are closely related to the type and coordination geometry of the phosphine ligands, and the γ values vary as the fifth power of the number of substituents with π-electrons structure.

Wavelength Dispersion of Optical Power Limiting in Stilbene3 Analyzed within a Three Level Model

1999 ◽  
Vol 597 ◽  
Author(s):  
P-A. Chollet ◽  
A. Somin ◽  
B. Paci ◽  
V. Hully ◽  
J-M. Nunzi ◽  
...  
Keyword(s):  
Excited State Absorption ◽  
Optical Power ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Visible Range ◽  
Nanosecond Laser ◽  
Nonlinear Transmission ◽  
Two Photon ◽  
Level Model

AbstractNonlinear transmission in a dye (stilbene3) exhibiting two-photon absorption (TPA) has been studied has a function of wavelength, in the visible range using nanosecond laser pulses. The results have been analyzed within a three level model: the first excited one is populated by TPA and is excited toward an upper level (excited state absorption, ESA). The TPA and ESA spectra obtained by optical limiting (δ∼10-46 cm4s photon-1molecule-1; δ∼ 10-16 cm2) are in good agreement with those determined by two-photon fluorescence and Kerr ellipsometry. Thus, nonlinear transmission appears as a useful technique to estimate the TPA and ESA contributions in optical limiting.

Non-Linear Light Scattering in a Two Component Medium Optical Limiting Application

1997 ◽  
Vol 479 ◽  
Author(s):  
V. Joudrier ◽  
J C. Fabre ◽  
P. Bourdon ◽  
F. Hache ◽  
C Flytzanis
Keyword(s):  
Light Scattering ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Spherical Particles ◽  
Nanosecond Laser ◽  
Two Component ◽  
Non Linear ◽  
Nanosecond Laser Pulses ◽  
532 Nm ◽  
Surrounding Liquid

AbstractThe first experimental investigation of an optical limiting device based on a suspension of spherical particles in a surrounding liquid is presented. The expected property is the non-linear light scattering based on a refractive index mismatch between the two components that appears at high intensity. Several experiments performed at 532 nm with nanosecond laser pulses provide good indication that such non-linear scattering is observed.

PICOSECOND OPTICAL LIMITING PERFORMANCE OF A NOVEL PPV-ZnPc CONJUGATED POLYMER

2000 ◽  
Vol 09 (03) ◽  
pp. 289-296 ◽  
Author(s):  
JINGJIN YU ◽  
LIMING WANG ◽  
QING WANG ◽  
MANKIT NG ◽  
LUPING YU
Keyword(s):  
Conjugated Polymers ◽  
Time Scale ◽  
Conjugated Polymer ◽  
Optical Power ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Picosecond Time Scale ◽  
Backbone Modification ◽  
Optical Power Limiting ◽  
532 Nm

A novel ZnPc monomer as well as PPV-ZnPc conjugated polymers have been synthesized and their optical power limiting (OPL) performances toward picosecond laser pulses at 532 nm have been measured. The comparison with the performance of C 60 under the same condition indicates that two of the compounds synthesized outperformed C 60 at picosecond time scale. It was found that conjugated PPV polymers containing a small amount of ZnPc cannot only preserve, but have also showed improvement over the monomer's OPL properties. It is believed that the backbone modification was responsible for the enhanced OPL performance.

Optical Limiting Performance of ZnS Nanotube

2007 ◽  
Author(s):  
Qing Chang ◽  
Cun Chang ◽  
Hongan Ye ◽  
Yinglin Song
Keyword(s):  
Effective Medium Theory ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Effective Medium ◽  
Experimental Results ◽  
Nanosecond Laser ◽  
Medium Theory ◽  
Nanosecond Laser Pulses ◽  
532 Nm

Optical limiting (OL) performances of ZnS nanotube and ZnS nanoparticle in N, N dimethyllformaide (DMF) were comparatively investigated by using nanosecond laser pulses at 532 nm. Experimental results indicate that the shapes of ZnS nanomaterials have effect on their OL performances, and ZnS nanotube exhibits stronger OL performance than ZnS nanoparticle. The results were analyzed by use of the Maxwell-Garnett Effective Medium theory (MGT).

Impact of the lasr wavelength and fluence on the ablation rate of aluminium

Open Physics ◽  
2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Mihai Stafe ◽  
Ionut Vladoiu ◽  
Ion Popescu
Keyword(s):  
Plasma Plume ◽  
Second Harmonic ◽  
Laser System ◽  
Target Surface ◽  
Threshold Value ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Nanosecond Laser ◽  
Nanosecond Laser Pulses ◽  
532 Nm

AbstractThe dependence of the ablation rate of aluminium on the fluence of nanosecond laser pulses with wavelengths of 532 nm and respectively 1064 nm is investigated in atmospheric air. The fluence of the pulses is varied by changing the diameter of the irradiated area at the target surface, and the wavelength is varied by using the fundamental and the second harmonic of a Q-switched Nd-YAG laser system. The results indicate an approximately logarithmic increase of the ablation rate with the fluence for ablation rates smaller than ∼6 μm/pulse at 532 nm, and 0.3 μm/pulse at 1064 nm wavelength. The significantly smaller ablation rate at 1064 nm is due to the small optical absorptivity, the strong oxidation of the aluminium target, and to the strong attenuation of the pulses into the plasma plume at this wavelength. A jump of the ablation rate is observed at the fluence threshold value, which is ∼50 J/cm2 for the second harmonic, and ∼15 J/cm2 for the fundamental pulses. Further increasing the fluence leads to a steep increase of the ablation rate at both wavelengths, the increase of the ablation rate being approximately exponential in the case of visible pulses. The jump of the ablation rate at the threshold fluence value is due to the transition from a normal vaporization regime to a phase explosion regime, and to the change of the dimensionality of the hydrodynamics of the plasma-plume.

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