Nonlinear Optical Properties of Modified Carbocyanines

1997 ◽  
Vol 479 ◽  
Author(s):  
Nansheng Tang ◽  
Weijie Su ◽  
Thomas M. Cooper ◽  
Daniel G. McLean ◽  
Donna M. Brandelik ◽  
...  
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Pump Probe ◽  
Chirped Pulses ◽  
Molecular Hyperpolarizability ◽  
Meso Position ◽  
532 Nm

AbstractWe studied the optical nonlinearities of modified 3,3′-diethylthiadicarbocyanine iodides (X-DTDCI) in dimethyl sulfoxide (DMSO) solutions (X = H, Cl, Br at meso position) by a pump-probe technique with crossed polarized chirped laser pulses at room temperature. Reverse-saturable-absorption (RSA) with monoexponential lifetimes is observed at 532 nm in all the samples studied. We determined the effective excited-state absorption cross-sections and their lifetimes for all the samples investigated and found that they clearly correlate to the substituent X at the meso position. Empowered by the chirped pulses, a much faster nonlinearity with a decay time of ˜3.1 ps that is much shorter than the laser pulses used, is unveiled in Cl-DTDCI. We expressed both the absorptive and the refractive part of this fast nonlinearity as the equivalent molecular hyperpolarizability γ1212 and found γ1212 = (8.1 + i9.8) × 10−32erg−1.

Photophysics and reverse saturable absorption of cationic dinuclear iridium(iii) complexes bearing fluorenyl-tethered 2-(quinolin-2-yl)quinoxaline ligands

2021 ◽  
Author(s):  
Cuifen Lu ◽  
Taotao Lu ◽  
Peng Cui ◽  
Svetlana Kilina ◽  
Wenfang Sun
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Triplet Excited State ◽  
532 Nm

Dinuclear Ir(iii) complexes tethered by fluorenyl motif exhibited weak 1,3MLCT/1,3LLCT absorption at >500 nm, dual phosphorescence, broad triplet excited-state absorption, and reverse saturable absorption at 532 nm.

Dynamic saturable optical nonlinearities in free base tetrapyridylporphyrin

2003 ◽  
Vol 07 (06) ◽  
pp. 452-456 ◽  
Author(s):  
Newton M. Barbosa Neto ◽  
Leonardo De Boni ◽  
José J. Rodrigues ◽  
Lino Misoguti ◽  
Cléber R. Mendonça ◽  
...  
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Optical Nonlinearities ◽  
Free Base ◽  
Photophysical Parameters ◽  
Crossing Time ◽  
532 Nm

Dynamic optical nonlinearities in free base tetrapyridylporphyrin ( H 2 TPyP ) solutions were investigated at 532 nm with the Z-scan technique. We observed a reverse saturable absorption process that was found to have a fast contribution related to the singlet population and a slow accumulative contribution arising from the triplet population. The optical excitations and subsequent relaxations can be interpreted with a five-energy-level diagram that allows determination of the excited states photophysical parameters such as triplet and singlet absorption cross-sections and the intersystem crossing time.

Optical limiting properties of water-soluble phthalocyanine derivatives

2003 ◽  
Vol 07 (06) ◽  
pp. 447-451 ◽  
Author(s):  
Shuang Zhang ◽  
Zhou Yang ◽  
Hongwei Liu ◽  
Fu Xi ◽  
Zhi-xin Guo ◽  
...  
Keyword(s):  
Cross Section ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Water Soluble ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Solubility In Water ◽  
Practical Applications ◽  
Good Solubility ◽  
532 Nm

The optical-limiting properties of several water-soluble phthalocyanine derivatives in aqueous solution were measured at 532 nm with 10 ns pulses. The excited state absorption cross-section σex of the derivatives were determined with the Z-scan technique. The results showed that the phthalocyanine derivatives are materials for reverse saturable absorption. It was noted that the optical limiting performance of the phthalocyanine derivatives in aqueous solutions can be controlled through the addition of alkalis. These phthalocyanine derivatives possess good solubility in water and optical limiting controllability, which give rise to their use for practical applications.

PICOSECOND REVERSE SATURABLE ABSORPTION AND OPTICAL LIMITING IN FULLERENES AND THEIR METAL DERIVATIVES

2000 ◽  
Vol 09 (04) ◽  
pp. 505-521 ◽  
Author(s):  
J. CALLAGHAN ◽  
W. J. BLAU ◽  
F. Z. HENARI
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Ground State ◽  
Population Level ◽  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Picosecond Pulses ◽  
Metal Derivatives ◽  
532 Nm

Investigations of the reverse saturable absorption behaviour of Fullerenes C 60 and C 70 and some of their Pt and Pd metal derivatives have been carried out with picosecond pulses at 532 nm. From intensity dependent transmission measurements, coupled with a population level kinetic analysis, excited state cross sections were determined for the materials. These show that C 60 possesses the largest excited state to ground state cross-section ratio and that, of the materials studied, it offers the best optical limiting ability around 532 nm. C 70, due to its large ground state absorption, has been shown not to be an efficient limiter. The metal derivatives perform better than C 70 but less efficiently than C 60.

NONLINEAR OPTICAL RESPONSE AND REVERSE SATURABLE ABSORPTION OF RARE EARTH PHTHALOCYANINE IN DMF SOLUTION

2003 ◽  
Vol 12 (03) ◽  
pp. 367-376 ◽  
Author(s):  
G. A. KUMAR
Keyword(s):  
Rare Earth ◽  
Excited State ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Excited State Absorption ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption Cross

Nonlinear optical response and reverse saturable absorption behavior of various rare earth phthalocyanines such as Nd , Eu , Sm and La in dimethyl formamide (DMF) solution were studied under high power Nd:YAG laser excitation. Excited state absorption cross-sections and two-photon absorption cross-sections of these systems are measured from the limiting characteristics. The SmHPc 2 system yields maximum value for excited state absorption cross-section and its potential application in DMF as a suitable optical limiter is also discussed.

THIRD-ORDER NONLINEARITIES AND OPTICAL LIMITING OF C60 POLYURETHANE–UREA FILMS

2004 ◽  
Vol 13 (01) ◽  
pp. 45-54 ◽  
Author(s):  
SHENG-LI GUO ◽  
BING GU ◽  
TAO ZHANG
Keyword(s):  
Excited State Absorption ◽  
Optical Limiting ◽  
Homogeneous Material ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Limiting Behavior ◽  
Nonlinear Optical Absorption ◽  
The Difference ◽  
532 Nm

We report on the measurement of the nonlinear optical absorption and refraction coefficients of C60-containing polyurethane–urea films on a nanosecond scale at a 532-nm wavelength, using the Z-scan technique. The optical limiting properties were also observed. The results show that the C60 polyurethane–urea is a kind of homogeneous material with a range of C60 content. With the difference in C60 content in polymers, the optical limiting properties are many and the required transmittance and transmitted energy can be altered depending on the C60 content in polymers. We suggest that the third-order nonlinearities and optical limiting behavior are consistent with excited-state absorption (reverse saturable absorption) as a mechanism.

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.

Synthesis of Silver Nanowires and Investigation of their Optical Limiting Properties

2011 ◽  
Vol 295-297 ◽  
pp. 152-155 ◽  
Author(s):  
Ya Ping Han ◽  
Ming Hai Luo ◽  
Qing Wen Wang ◽  
Jin Xin Wang ◽  
Xue Lian Gao
Keyword(s):  
Silver Nanowires ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
X Ray Diffraction ◽  
Current Electric Field ◽  
532 Nm ◽  
State Ionic

Silver nanowires were fabricated in a direct current electric field using a solid-state ionic method, and were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The reverse saturable absorption and optical limiting properties in silver nanowires, suspended in de-ionized water were investigated by using an EKSPLA (PL2143A) picosecond laser, which produced 30 ps laser pulses at 532 nm with a repetition rate of 2 Hz. Experimental results indicate silver nanowires have obvious optical limiting properties.

Design and Synthesis of New Acceptor Molecules for Photo-Induced Electron Transfer Reverse Saturable Absorption

1999 ◽  
Vol 598 ◽  
Author(s):  
M. Bader ◽  
J. Moser ◽  
H. Li ◽  
S. Tarter ◽  
C. Spangler
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Optical Power ◽  
Laser Frequency ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Incident Wavelength ◽  
Limiting Behavior ◽  
Design And Synthesis ◽  
Laser Systems

ABSTRACTWith the advent of efficient and relatively inexpensive pulsed and CW laser systems for both civilian and military applications, the need for adequate eye and sensor protection is becoming increasingly important. While it is possible to filter out harmful wavelengths if the laser frequency is known, the proliferation of frequency agile laser sources underscores the need for “smart” passive materials that can sense the incident wavelength and provide protection. There has been considerable progress made in recent years in the design of optical power limiting (OPL) materials that can function by a variety of mechanisms, most of which derive their limiting behavior from some type of nonlinear absorption process. The most well-studied of these processes involve excited state absorption in which the absorption cross-sections of the photo-generated transient species are much greater than the original S0 to S1 transition. In this presentation we will discuss the efficacy of charge transfer species for optical limiting, and the need for more and better electron acceptor species.

Saturable and reverse saturable absorption in silver nanodots at 532 nm using picosecond laser pulses

2008 ◽  
Vol 104 (7) ◽  
pp. 073107 ◽  
Author(s):  
Ullas Gurudas ◽  
Elijah Brooks ◽  
Daniel M. Bubb ◽  
Sebastian Heiroth ◽  
Thomas Lippert ◽  
...  
Keyword(s):  
Picosecond Laser ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Picosecond Laser Pulses ◽  
Silver Nanodots ◽  
532 Nm
Sign in / Sign up

Export Citation Format

Share Document