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.

OPTICAL LIMITING STUDIES IN PHOTOREFRACTIVE PURE AND IRON-DOPED Bi12SiO20 CRYSTALS

2000 ◽  
Vol 09 (02) ◽  
pp. 217-225 ◽  
Author(s):  
P. SREERAMANA AITHAL ◽  
P. PREM KIRAN ◽  
D. NARAYANA RAO
Keyword(s):  
Excited State Absorption ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Limiting Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Iron Incorporation ◽  
Optical Limiter ◽  
Level Model

Optical limiting characteristics of pure and 150 ppm Fe-doped Bi 12 SiO 20 (BSO:Fe) crystals are studied at high intensity nanosecond pulse regime. When the input light is at 532 nm and at 595 nm with 6 ns pulse duration, a good optical limiting behavior is observed due to simultaneous effect of trap assisted excited state absorption and two photon absorption. The precise role of the internal defects due to impurity centers present in the crystal lattice is explained on the basis of a four level model. This study reveal that the increased nonlinear absorption due to iron incorporation in BSO makes it an excellent passive optical limiter.

Design, Synthesis and Characterization of New Bimechanistic Optical Power Limiters Based on Reverse Saturable and Two-photon Absorption

1999 ◽  
Vol 597 ◽  
Author(s):  
C. W. Spangler ◽  
E. H. Elandaloussi ◽  
B. Ozer ◽  
K. Ashworth ◽  
L. Madrigal ◽  
...  
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Optical Power ◽  
Radical Cations ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon

AbstractDuring the past five years there has been considerable progress in the design of organic materials for optical power limiting (OPL) applications. One of the more promising and widely studied material approaches involves reverse saturable absorption (RSA) from various excited states. We have recently been examining the efficacy of utilizing highly absorbing photogenerated charge states for RSA. Both polaronic radical cations and bipolaronic dications are possible candidates for this mode of optical limiting. Equally intriguing are new approaches to designing chromophores with large two-photon absorption (TPA) cross-sections. For some pulse durations the effective two-photon cross-section for bis-(diphenylamino)diphenylpolyenes, and dendrimers based on these repeat units, are extraordinaryly large, indicative of excited state absorption. In this presentation we will discuss the possibility of combining these two optical limiting mechanistic paradigms in single structures, which may then be considered as bimechanistic optical power limiters.

DENDRITIC FLUORENE OLIGOMERS FOR NONLINEAR ABSORPTION IN THE VISIBLE RANGE

2005 ◽  
Vol 14 (03) ◽  
pp. 311-318 ◽  
Author(s):  
CYRIL BARSU ◽  
CHANTAL ANDRAUD ◽  
NADIA AMARI ◽  
SYLVIE SPAGNOLI ◽  
PATRICE L. BALDECK
Keyword(s):  
Nonlinear Absorption ◽  
Excited State Absorption ◽  
Photon Absorption ◽  
Visible Range ◽  
Absorption Process ◽  
Time Duration ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
At Resonance

We report here the nonlinear absorption properties of dendritic molecules of oligofluorenes. Measurements were performed in chloroform between 450 and 650 nm for nanosecond time duration pulses. The nonlinear absorption is attributed to a three-photon absorption process involving first a two-photon absorption (TPA) step followed by an excited state absorption (ESA) process. The corresponding three-photon absorption coefficient α3 presents at resonance high values (α3 > 10000 cm 3/ GW 2 for 2G1 the first dendrimer generation bearing a bifluorene at a concentration of 50 g/L). These values are strongly enhanced with respect to those obtained in the same conditions for analog linear oligofluorenes.

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.

Synthesis and characterization of optical properties of soft and hard Er3+-doped (K Na)NbO3 piezophotonic ceramics

2020 ◽  
Vol 557 (1) ◽  
pp. 73-84
Author(s):  
M. C. dos Santos ◽  
J. A. Eiras ◽  
M. H. Lente
Keyword(s):  
Excited State Absorption ◽  
Photon Absorption ◽  
Visible Range ◽  
Secondary Phases ◽  
Absorption Process ◽  
Photoluminescence Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Potential Applications

Real-time tuning of photoluminescence properties are highly desirable for potential applications. Thus, one proposed approach is to tune the photoluminescence emissions by applying an external electric field. However, in order to switch the ferroelectric polarization, high quality bulk ceramics is demanded. In this work, soft and hard Er3+-doped (K,Na)NbO3 piezophotonic ceramics were prepared by the conventional route and their microstructural, structural and up-conversion emission properties were investigated. Dense and free from secondary phases ceramics were successfully produced. The photoluminescence spectra, in the visible range, were characterized as a function of the pumping power. For the soft composition, a remarkable green shift was verified with increasing the laser power. It was supposed that the excited state absorption, involving a three-photon absorption process, was involved in the 4S3/2→4I15/2 transition. For the hard composition, the two-photon absorption process was dominant and the presence of complex defects reduced significantly the 4F9/2→4I15/2 transition.

Theoretical investigation of two-photon absorption properties and optical limiting behavior of two symmetrical fluorene derivatives

2015 ◽  
Vol 24 (04) ◽  
pp. 1550046 ◽  
Author(s):  
Hong Ma ◽  
Jiancai Leng ◽  
Mei Liu ◽  
Lina Zhao ◽  
Yang Jiao
Keyword(s):  
Fdtd Method ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Rate Equations ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Limiting Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Potential Applications

Two-photon absorption and optical limiting of two fluorenyl-based derivatives, 9,9-dimethyl-2,7-bis((E)-4-nitrostyryl)-9H-fluorene and 9,9-dimethyl-2,7-bis((E)-4-((E)-4-nitrostyryl)styryl)-9H-fluorene, in gas phase and solvent with nanosecond laser pulse have been theoretically investigated by solving the coupled rate equations and the field intensity equation employing an iterative predictor–corrector finite-difference time-domain (FDTD) method. The results show that both optical limiting properties and two-photon absorption cross-section strongly depend on the length of these molecules and the solvent. Moreover, the dynamical two-photon absorption behavior is affected by the thickness of samples and the pulse duration. These discoveries demonstrate that these fluorenyl-based derivatives possess highly promising characteristics and have potential applications for optical limiting devices.

Two-photon absorption-based optical limiting in 2-(2-methoxybenzyllideneamino)-5-methylphenylmercuric chloride-doped PMMA film

2014 ◽  
Vol 28 (10) ◽  
pp. 1450079 ◽  
Author(s):  
Qusay Mohammed Ali Hassan
Keyword(s):  
Continuous Wave ◽  
Optical Power ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Pmma Film ◽  
Potential Candidate ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Cw Laser ◽  
Optical Power Limiting

The synthesis and the linear and optical limiting properties of a 2-(2-methoxybenzyllideneamino)-5-methylphenylmercuric chloride-doped poly(methylmethacrylate) (PMMA) film are described. The sample exhibits strong optical power limiting under continuous wave (cw) laser at the experimental wavelength. The mechanisms for the optical limiting were discussed on the basis of the two-photon absorption involved in the process. The nonlinear absorption coefficient β of the sample is estimated and its value is found to be 67 × 10-2 cm/W. Our study indicated that the investigated compound-doped PMMA film is a potential candidate for optical limiting applications in low power cw regime.

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