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.

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.

THEORETICAL STUDIES ON LINEAR AND NONLINEAR OPTICAL CHARACTERIZATION AND OPTICAL LIMITING PROPERTY OF Pb(II), In(III) CHLORIDE, Ni(II) METALLATED 1,4,8,11,15,18,22,25-OCTAALKYLPHTHALOCYANINES

2007 ◽  
Vol 16 (02) ◽  
pp. 247-254 ◽  
Author(s):  
ASLI KARAKAS ◽  
AYHAN ELMALI
Keyword(s):  
Nonlinear Optical ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Limiter ◽  
Limiting Property ◽  
Insight Into ◽  
Good Agreement

To provide an insight into the optical limiting (OL) behavior of a series of 3 metallated 1,4,8,11,15,18,22,25-octaalkylphthalocyanines; the third-order nonlinear optical (NLO) properties, one-photon absorption (OPA) and two-photon absorption (TPA) characterizations have been theoretically investigated by means of AM1, ZINDO and configuration interaction (CI) methods. The highest values for the TPA cross-section (δ(ω)) are exhibited by derivatives metallated with indium and lead. It is also seen that the nickel-metallated compound might be a passive optical limiter of the series, indicating the weakest δ(ω) and second hyperpolarizability (γ). Our calculated results are in good agreement with the previous experimental observations on the examined molecules.

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.

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.

Synthesis, Characterization, Two-Photon Absorption, and Optical Limiting Properties of Ladder-Type Oligo-p-phenylene-Cored Chromophores

2008 ◽  
Vol 18 (18) ◽  
pp. 2770-2779 ◽  
Author(s):  
Qingdong Zheng ◽  
Sandesh K. Gupta ◽  
Guang S. He ◽  
Loon-Seng Tan ◽  
Paras N. Prasad
Keyword(s):  
Optical Limiting ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Two-photon absorption and broadband optical limiting with bis-donor stilbenes

1997 ◽  
Vol 22 (24) ◽  
pp. 1843 ◽  
Author(s):  
J. E. Ehrlich ◽  
X. L. Wu ◽  
I.-Y. S. Lee ◽  
Z.-Y. Hu ◽  
H. Röckel ◽  
...  
Keyword(s):  
Optical Limiting ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

Two-photon absorption based optical limiting and stabilization in organic molecule-doped solid materials

1995 ◽  
Vol 117 (1-2) ◽  
pp. 133-136 ◽  
Author(s):  
Guang S. He ◽  
Raz Gvishi ◽  
Paras N. Prasad ◽  
Bruce A. Reinhardt
Keyword(s):  
Organic Molecule ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Solid Materials ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Polyfluorenylacetylene for near-infrared laser protection: polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties

RSC Advances ◽  
2017 ◽  
Vol 7 (85) ◽  
pp. 53785-53796 ◽  
Author(s):  
Gang Zhao ◽  
Yan Feng ◽  
Shanyi Guang ◽  
Hongyao Xu ◽  
Naibo Lin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Near Infrared ◽  
Optical Limiting ◽  
High Thermal Stability ◽  
Photon Absorption ◽  
Structure And Properties ◽  
Absorption Mechanism ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Good Solubility

The incorporation of styryl/stilbene–fluorene into polyacetylenes not only endowed the polymers with novel near-infrared optical limiting properties based on a two-photon absorption mechanism but good solubility and high thermal stability.

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