Reverse saturable Absorption in Organically Doped Xerogels

1997 ◽  
Vol 479 ◽  
Author(s):  
M. Brunel ◽  
F. Chaput ◽  
S. A. Vinogradov ◽  
B. Campagne ◽  
M. Canva ◽  
...  
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Visible Spectrum ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Nanosecond Laser ◽  
Reverse Saturable Absorption ◽  
Saturable Absorbers ◽  
Sol Gel Process ◽  
Nanosecond Laser Pulses

AbstractPd and Zn - tetraphenyltetrabenzoporphyrins (PdTPTBP and ZnTPTBP), hexacyanin 3 (HITCI), and substituted phthalocyanines were incorporated in solid-state matrices (xerogels) using a sol-gel process. Nonlinear reverse saturable absorption was observed with those materials when they were illuminated with nanosecond laser pulses at 532 nm, or other wavelengths in the visible spectrum (between 450 nm and 630 nm). PdTPTBP doped xerogels exhibit a nonlinear activation threshold of about 10 mJ/cm , which is much lower than the value of 80 mJ/cm2 obtained under similar conditions with classical Al phthalocyanine chloride, or HITCI molecules. Solid state “red active” reverse saturable absorbers can be obtained with substituted phthalocyanines doped xerogels. The different experimental results are discussed using classical 4- energy level diagrams.

Doped Gels for Optical Limiting Applications.

1994 ◽  
Vol 374 ◽  
Author(s):  
Marc Brunel ◽  
Michael Canva ◽  
Alain Brun ◽  
Frédéric Chaput ◽  
Laurent Malier ◽  
...  
Keyword(s):  
Sol Gel ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Covalent Bonding ◽  
Indirect Measurement ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Sol Gel Process ◽  
The Matrix ◽  
532 Nm

AbstractAluminophthalocyanine and fullerene were trapped in solid transparent matrices using the sol-gel process. The covalent bonding to the matrix improved the chemical stability of the fullerene doped sample. Solid state optical limiting at 532 nm, mainly due to reverse saturable absorption processes, was observed with such samples. The non-linear transmission threshold was typically about 10 mJ/cm2 and an induced density of 1.6 was observed with three orders of magnitude greater illumination. Fluorescent decay measurements support the choice of a three energy level absorption model for the process, which allows indirect measurement of the excited-state absorption.

Femtosecond to Nanosecond Characterization of Optical Limiting Mechanisms in Power Limiting Liquids and Solids

1999 ◽  
Vol 597 ◽  
Author(s):  
A. Malko ◽  
S. Xu ◽  
H-L. Wang ◽  
R. Kohlman ◽  
L. Smilowitz ◽  
...  
Keyword(s):  
Solid State ◽  
High Performance ◽  
Transient Absorption ◽  
Visible Spectrum ◽  
Damage Threshold ◽  
Optical Limiting ◽  
Transient Absorption Spectroscopy ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Femtosecond Transient Absorption

AbstractWe present our recent advances toward the development of high-performance solid-state optical limiting devices using reverse saturable absorption (RSA) dyes doped into optical host materials. Femtosecond transient absorption spectroscopy was employed to determine both the spectral regions of strong RSA, and the singlet-triplet excited-state dynamics. The optical limiting in the visible spectrum in both metallo-phthalocyanines and metallo-porphyrins is due to a combination of singlet and triplet RSA. Optical limiting performance was studied for RSA dyes in dual tandem limiters (both in solution and solid-state). Our best results in the solid-state yielded an attenuation of 400x, and a damage threshold of up to several mJ at f/5 focusing. The optical limiting at f/5 is further enhanced, particularly in the solid-state, by self-defocusing thermal nonlinearities.

Modification of the bronze alloy microtopography under irradiation with a scanning beam of nanosecond laser pulses

2019 ◽  
pp. 27-34
Author(s):  
V.N. Yolkin ◽  
◽  
T.V. Malinskiy ◽  
Yu.V. Khomich ◽  
V.A. Yamshchikov ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Bronze Alloy ◽  
Scanning Beam ◽  
Nanosecond Laser Pulses

Damage to multilayer dielectric coatings by nanosecond laser pulses

1985 ◽  
Vol 15 (4) ◽  
pp. 478-483
Author(s):  
V N Alekseev ◽  
M B Svechnikov ◽  
V N Chernov
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Dielectric Coatings ◽  
Nanosecond Laser Pulses ◽  
Multilayer Dielectric

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

An investigation of the cleaning performances of femtosecond and nanosecond laser pulses for artificially soiled papers with sizing

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
Canan Y. Boynukara ◽  
Mehmet Uguryol ◽  
Gurcan Mavili ◽  
Selcuk Akturk
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Nanosecond Laser Pulses

Laser photoionization of triacetone triperoxide (TATP) by femtosecond and nanosecond laser pulses

2006 ◽  
Vol 252 (1) ◽  
pp. 69-72 ◽  
Author(s):  
Christopher Mullen ◽  
David Huestis ◽  
Michael Coggiola ◽  
Harald Oser
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Triacetone Triperoxide ◽  
Nanosecond Laser Pulses ◽  
Laser Photoionization
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