INVESTIGATION OF NEAR TWO-PHOTON RESONANCE OPTICAL NONLINEARITIES IN Ni(Ac)2[N-(8-QUINOLYL) PYRIDINE-2-CARBOXAMIDE] · 4H2O BY THE Z-SCAN TECHNIQUE

2003 ◽  
Vol 12 (01) ◽  
pp. 81-89 ◽  
Author(s):  
SHENG-LI GUO ◽  
HUI-TIAN WANG ◽  
N. B. MING ◽  
JUN-YONG ZHANG ◽  
ZHI-JIAN GUO
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Closed Aperture ◽  
Optical Nonlinearities ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nonlinear Optical Absorption ◽  
532 Nm ◽  
Photon Resonance

We describe a modified Z-scan technique for the case when nonlinear refraction is accompanied by nonlinear absorption to separately evaluate the nonlinear refraction and the nonlinear absorption by performing straightforward measurements with the aperture removed. We divide the closed aperture (S < 1) normalized Z-scan by a scan with an open aperture (S = 1). With nanosecond scale at a 532 nm wavelength, we first measured the nonlinear optical absorption and refraction coefficients of a solution of Ni(Ac)2[N-(8-quinolyl) pyridine-2-carboxamide] · 4H2O by using the modified Z-scan technique. The nonlinear absorption originates from the near resonant two-photon absorption while the mechanism of the nonlinear refraction is the near resonant two-photon absorption transition enhancement. The linear increasing dependences of the optical nonlinearities on the incident irradiance arise from the population redistribution due to the near resonant two-photon absorption.

NONLINEAR ABSORPTION AND OPTICAL LIMITING IN SOLUTIONS OF SOME RARE EARTH SUBSTITUTED PHTHALOCYANINES

2001 ◽  
Vol 10 (01) ◽  
pp. 113-121 ◽  
Author(s):  
K. P. UNNIKRISHNAN ◽  
JAYAN THOMAS ◽  
BINOY PAUL ◽  
ACHAMMA KURIAN ◽  
PRAMOD GOPINATH ◽  
...  
Keyword(s):  
Rare Earth ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Open Aperture ◽  
Pulse Excitation ◽  
Two Photon Absorption ◽  
Two Photon ◽  
532 Nm

Effective nonlinear absorption coefficient, β eff , of solutions of some rare earth substituted phthalocyanines (viz: Sm(Pc)2, Eu(Pc)2 and LaPc) was measured using open aperture Z-scan technique under nanosecond pulse excitation at 532 nm. The effect of nonlinear absorption on optical limiting in these samples was also investigated. Both nonlinear absorption and optical limiting phenomena in these samples are attributed to sequential two-photon absorption (STPA) process.

Spectroscopy and Nonlinear Absorption of α, ω-dithienyi Polyenes

1997 ◽  
Vol 479 ◽  
Author(s):  
L. V. Natarajan ◽  
Laura A. Sowards ◽  
C. W. Spangler ◽  
N. Tang ◽  
P. A. Fleitz ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Steady State Fluorescence ◽  
Nonlinear Optical Absorption ◽  
Substituted Polyenes

AbstractThe photophysics and nonlinear absorption behaviour of a series of α, ω-dithienyl polyenes were studied in chloroform and n-octane solutions. Steady state fluorescence, fluorescence lifetime and quantum yield measurements were made. The fluorescence quantum yields were significantly lower than those of the corresponding ax,o-diphenyl polyenes. Among the dithienyl polyenes, 3,3′-substituted polyenes exhibited stronger fluorescence than those of the 2,2′-substituted. Nonlinear optical absorption experiments showed evidence of two photon absorption.

scholarly journals Study of Nonlinear Refraction and Nonlinear Absorption Coefficients of Different CdS Film Thickness by diode laser

2013 ◽  
Vol 10 (1) ◽  
pp. 217-225 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Diode Laser ◽  
Nonlinear Absorption ◽  
Nonlinear Refraction ◽  
Michelson Interferometer ◽  
Photon Absorption ◽  
Absorption Coefficients ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Cds Film ◽  
Transmission Test

In the present work, different thicknesses of CdS film were prepared by chemical bath deposition. Z-Scan technique was used to study the nonlinear refractive index and nonlinear absorption coefficients. Linear optical testing were done such as transmission test, and thickness of films were done by the interference fringes (Michelson interferometer). Z-scan experiment was performed at 650nm using CW diode laser and at 532nm wavelength. The results show the effect of self-focusing and defocusing that corresponds with nonlinear refraction n2. The effect of two-photon absorption was also studied, which correspond to the nonlinear absorption coefficient B.

TWO-PHOTON ABSORPTION AND OPTICAL-LIMITING PROPERTIES IN DIMETHYLAMINOCYANOBIPHENYL CRYSTAL

1996 ◽  
Vol 05 (04) ◽  
pp. 767-774 ◽  
Author(s):  
P. FENEYROU ◽  
O. DOCLOT ◽  
D. BLOCK ◽  
P.L. BALDECK ◽  
J. ZYSS
Keyword(s):  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Transmitted Intensity ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Thick Crystal ◽  
Optical Applications ◽  
Nonlinear Optical Applications ◽  
532 Nm

Dimethylaminocyanobiphenyl (DMACB) has been synthesized in view of nonlinear optical applications in the visible. In this communication, we report the strong nonlinear absorption of DMACB crystal in its noncentrosymmetric form which could be useful for optical-limiting applications in the visible. The transmitted intensity of a 230 μm thick crystal was measured at λ=532 nm as a function of beam intensity and polarization. For light polarized parallel to the long molecular axis, the nonlinear absorption coefficient is 130±40 cm GW −1. Various hypothesis to explain this value are discussed.

Two-Photon Absorption, Nonlinear Refraction and Optical Limiting in Semiconductors

2008 ◽  
pp. 404-404-20 ◽  
Author(s):  
EW Van Stryland ◽  
H Vanherzeele ◽  
MA Woodall ◽  
MJ Soileau ◽  
AL Smirl ◽  
...  
Keyword(s):  
Nonlinear Refraction ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films

2018 ◽  
Vol 8 (10) ◽  
pp. 1810 ◽  
Author(s):  
Rihan Wu ◽  
Jack Collins ◽  
Leigh Canham ◽  
Andrey Kaplan
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Quantum Confinement ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Silicon Thin Films ◽  
Gaussian Decomposition

We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We show an enhancement of the nonlinear refraction and a suppression of TPA in p-Si in comparison to c-Si, and the enhancement gets stronger as the wavelength increases.

scholarly journals Impact of the Subunit Arrangement on the Nonlinear Absorption Properties of Organometallic Complexes with Ruthenium(II) σ-Acetylide and Benzothiadiazole as Building Units §

Inorganics ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 67
Author(s):  
Eleonora Garoni ◽  
Alessia Colombo ◽  
Kenji Kamada ◽  
Claudia Dragonetti ◽  
Dominique Roberto
Keyword(s):  
Electron Acceptor ◽  
Cross Sections ◽  
Nonlinear Absorption ◽  
Organometallic Complexes ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Resonance Enhancement

In this paper, the nonlinear absorption properties of two complexes consisting of Ru(C≡CPh)(C≡C)(dppe)2 (dppe = Ph2PCH2CH2PPh2) as electron donor (D) and 4,7-di(2-thienyl)benzo[c][1,2,5]thiadiazole as electron acceptor (A) units in two different arrangement, i.e., A–D–A and D–A–D, are presented. They were measured in solution by the femtosecond open-aperture Z-scan method. The complexes show moderate two-photon absorption cross-sections σ(2) of several hundred to one thousand GM (here 1 GM = 10−50 cm4 s molecule−1 photon−1). Although they are formed by the same building units, it was found that the two-photon absorption values of the D–A–D arrangement are six times higher than that of the A–D–A one. This difference can be explained by the number of metal cores (one or two ruthenium centers), the geometrical configurations of the complexes (more or less planar), and the resonance enhancement by lowering the intermediate state.

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