Chitosan Gel Systems as Novel Host Materials for Optical Limiters

1997 ◽  
Vol 479 ◽  
Author(s):  
Hao Jiang ◽  
Weijie Su ◽  
Mark Brant ◽  
David Tomlin ◽  
Timothy J. Bunning
Keyword(s):  
Acetic Anhydride ◽  
Morphological Structure ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Laser Damage Threshold ◽  
Limiting Behavior ◽  
Optical Limiters ◽  
Host Materials ◽  
Chitosan Gel

AbstractTwo chitosan gel systems, chitosan/acetic anhydride and chitosan/glutaraldehyde, were studied as host materials for optical limiters. Both gels are transparent and have a very high laser damage threshold. The chitosan/acetic anhydride gel has a damage threshold > 540 J/cm2 while the chitosan/glutaraldehyde gel, which is slightly yellow in color, has a damage threshold > 600 J/cm2 (measurements made with 6.8 ns laser pulses at 532 nm). Different chromophore dopants, including porphyrin and CuPc, were tested. The optical limiting behavior of the guest/host gel systems was similar to their corresponding solution systems. The morphological structure of the gel systems was studied and the gelation process is discussed. Our current research explores the effect of gel morphology on the optical limiting properties of the chromophores and studies the relation between chromophores, cross-linking agents and the host materials. We have also investigated the relationship between optical properties and chemical structure of the gel/chromophore systems in order to optimize the optical behavior.

scholarly journals Laser-induced damage thresholds of ultrathin targets and their constraint on laser contrast in laser-driven ion acceleration experiments

2020 ◽  
Vol 8 ◽  
Author(s):  
Dahui Wang ◽  
Yinren Shou ◽  
Pengjie Wang ◽  
Jianbo Liu ◽  
Zhusong Mei ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Wide Band ◽  
Laser Pulses ◽  
Laser Damage Threshold ◽  
Single Shot ◽  
Bulk Materials ◽  
Free Standing ◽  
Wide Band Gap ◽  
Different Types ◽  
Laser Induced Damage

Abstract Single-shot laser-induced damage threshold (LIDT) measurements of multi-type free-standing ultrathin foils were performed in a vacuum environment for 800 nm laser pulses with durations τ ranging from 50 fs to 200 ps. The results show that the laser damage threshold fluences (DTFs) of the ultrathin foils are significantly lower than those of corresponding bulk materials. Wide band gap dielectric targets such as SiN and formvar have larger DTFs than semiconductive and conductive targets by 1–3 orders of magnitude depending on the pulse duration. The damage mechanisms for different types of targets are studied. Based on the measurement, the constrain of the LIDTs on the laser contrast is discussed.

Optical Limiting With Neutral Nickel Dithiolene Complexes

1999 ◽  
Vol 597 ◽  
Author(s):  
W. L. Tan ◽  
W. Ji ◽  
J. L. Zuo ◽  
J. F. Bai ◽  
X. Z. You ◽  
...  
Keyword(s):  
Benzene Solution ◽  
Excited State Absorption ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Linear Absorption ◽  
Time Resolved ◽  
Pump Probe ◽  
Limiting Behavior ◽  
Picosecond Pulses

AbstractWe report an investigation of optical-limiting behavior in two neutral nickel complexes with multi-sulfur 1,2 dithiolene ligands, [Ni(medt)2] I (medt = 5,6-dihydro-6-methyl-1,4-dithiin-2,3- dithiolate) and [Ni(phdt)2] 2 (phdt = 5,6-dihydro-5-phenyl-l,4-dithiin-2,3-dithiolate) in benzene solution. The fluence-dependent transmission of the complexes was observed with nanosecond and picosecond laser pulses at 532-nm wavelength. The limiting thresholds of the complexes were ˜0.3 J/cm2, when measured with the picosecond pulses. Both picosecond time-resolved pump-probe and Z-scan measurement revealed that the limiting effects should originate from excited-state absorption and refraction. The transparency window (400˜900 nm), observed in the linear absorption spectra of the complexes, indicated that their limiting response should cover a wider range than those of fullerenes and phthalocyanines.

Low Threshold ZnSe1−x Tex Optical Limiters

1994 ◽  
Vol 374 ◽  
Author(s):  
W. Ji ◽  
H. S. Tan ◽  
Z. C. Feng ◽  
P. Becla
Keyword(s):  
Laser Pulses ◽  
Free Carrier ◽  
Charge Carriers ◽  
Nanosecond Laser ◽  
Free Charge ◽  
Limiting Behavior ◽  
Optical Limiters ◽  
Low Threshold ◽  
Nanosecond Laser Pulses ◽  
Limiting Threshold

AbstractWe report an experimental investigation of optical limiting with bulk ZnSe1−xTex crystals at wavelengths just below the band edge, using nanosecond laser pulses. The limiting threshold as low as a few mJ/cm2 has been demonstrated. The generation of free charge carriers by singlephoton absorption, and subsequent free-carrier nonlinearities (nonlinear absorption and selfdefocusing) are responsible for the limiting behavior.

Modified carbon nanotubes as broadband optical limiting nanomaterials

2006 ◽  
Vol 21 (11) ◽  
pp. 2758-2766 ◽  
Author(s):  
Kok Chung Chin ◽  
Amarsinh Gohel ◽  
Hendry Izaac Elim ◽  
Weizhe Chen ◽  
Wei Ji ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Film Coating ◽  
Nanosecond Laser ◽  
Optical Limiters ◽  
Optical Limiter ◽  
Recent Developments ◽  
Device Applications ◽  
Modified Carbon Nanotubes

Carbon nanotubes have been shown to be effective broadband optical limiters for nanosecond laser pulses. In this paper, we review the recent developments of carbon nanotube-based optical limiters, in particular the effects of modifying carbon nanotubes for device applications. The techniques used to modify carbon nanotubes mainly include thin film coating, doping, and blending with optical absorbing dye. These modifications can greatly enhance the optical limiting performance of carbon nanotubes, with the goal of fabricating an optimal optical limiter system.

Guest-host optical limiters with high-laser-damage threshold

1997 ◽  
Author(s):  
Mark C. Brant ◽  
Michael E. De Rosa ◽  
Hao Jiang ◽  
Daniel G. McLean ◽  
Richard L. Sutherland ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Optical Limiters ◽  
High Laser

Elastic Polymer Guest-Host Optical Limiters

1997 ◽  
Vol 479 ◽  
Author(s):  
M. E. De Rosa ◽  
W. Su ◽  
M. C. Brant ◽  
D. G. Mclean
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Damage Threshold ◽  
Thermomechanical Properties ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Threshold Fluence ◽  
Optical Limiters ◽  
Order Of Magnitude ◽  
Elastic Polymer

AbstractThis paper presents the results of the bulk laser damage performance of undoped epoxy thermosets with glassy and rubbery mechanical properties and two commercial polymethylmethacrylate (PMMA) samples. We demonstrate how thermomechanical properties such as glass transition temperature (Tg) and equilibrium shear modulus (Ge) affect laser damage threshold. The rubbery epoxy elastomer shows a damage threshold fluence one order of magnitude higher than PMMA and 2.5 orders of magnitude higher than a glassy epoxy thermoset. A solid-state guest-host limiter is made by doping the epoxy elastomer with zinc octabromotetraphenylporphyrin (ZnOBP). The limiting performance of the elastomer limiter is compared to a solution of ZnOBP and C60 in toluene. Photochemical hysteresis effects in the solid limiter were also investigated.

Guest-host optical limiting elastomers with high laser damage threshold

1997 ◽  
Author(s):  
Michael E. De Rosa ◽  
Weigie Su ◽  
Doug Krein ◽  
Mark C. Brant ◽  
Daniel G. McLean
Keyword(s):  
Damage Threshold ◽  
Optical Limiting ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
High Laser

scholarly journals Efficient Optical Limiting in Carbon-Nanohorn Suspensions

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2074
Author(s):  
Elisa Sani ◽  
Nicolò Papi ◽  
Luca Mercatelli ◽  
Aldo Dell'Oro
Keyword(s):  
Smart Materials ◽  
Model Fitting ◽  
Aggregate Size ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Green Energy ◽  
Nanosecond Laser ◽  
Limiting Behavior ◽  
Carbon Nanohorns ◽  
Single Wall Carbon Nanohorns

Nonlinear optical properties of aqueous dispersions of single-wall carbon nanohorns (SWCNH) are investigated by a simple and original technique, relating nonlinear transmittance measurements with semi-empirical model fitting and allowing to identify the dominant nonlinear mechanism. The nanofluids shown a particularly strong optical limiting under irradiation by nanosecond laser pulses at 355, 532 and 1064 nm, much stronger than that previously reported in SWCNHs with smaller aggregate size. The effect is more relevant at 355 nm, where a nearly ideal optical limiting behavior with output energy practically independent on the input one is obtained, and it is attributed to the massive production of bubbles under the effect of light irradiation. This result opens interesting perspectives for the use of SWNCH-based suspensions for smart materials applications and green energy.

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