scholarly journals Study of two-photon absorption and optical limiting

BIBECHANA ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 26-31
Author(s):  
Bal Ram Ghimire
Keyword(s):  
Ground State ◽  
Dynamic Range ◽  
Energy Levels ◽  
Fused Silica ◽  
Photon Absorption ◽  
Irreversible Damage ◽  
Transmitted Beam ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Limiters

Simultaneous absorption of two photons of identical or different frequencies to excite a system that is atom or molecule from the ground state to excited state has great importance. It has an important role as a spectroscopic tool for determining the positions of energy levels that are not connected to the atomic ground state by the one-photon transition. In this work, experimental study of two-photon absorption of fused silica, quartz crystal, and metal halides and optical limiters based on the semiconductors are studied. It was investigated that two photons absorption depletes the transmitted beam but carrier defocusing spreads the beam in space and hence density is reduced. It was realized that limiters with thin samples have low dynamic range and fluency is high on the damage-prone surface and irreversible damage occurs. Some Semiconductors with high nonlinearity are found to be useful materials for optical limiters to protect devices like sensors. BIBECHANA 18 (2) (2021) 26-31

Two-photon absorption spectra of a near-infrared 2-azaazulene polymethine dye: solvation and ground-state symmetry breaking

2013 ◽  
Vol 15 (20) ◽  
pp. 7666 ◽  
Author(s):  
Honghua Hu ◽  
Olga V. Przhonska ◽  
Francesca Terenziani ◽  
Anna Painelli ◽  
Dmitry Fishman ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Absorption Spectra ◽  
Ground State ◽  
Near Infrared ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Polymethine Dye

Fluorescence anisotropy in indole under two-photon excitation in the spectral range 385–510 nm

2018 ◽  
Vol 20 (30) ◽  
pp. 19922-19931 ◽  
Author(s):  
M. E. Sasin ◽  
A. G. Smolin ◽  
K.-H. Gericke ◽  
E. Tokunaga ◽  
O. S. Vasyutinskii
Keyword(s):  
Propylene Glycol ◽  
Excited States ◽  
Spectral Range ◽  
Ground State ◽  
Fluorescence Anisotropy ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Molecular Ground State

This paper presents the detailed study of two-photon excited fluorescence in indole dissolved in propylene glycol produced by two-photon absorption from the molecular ground state to several high lying excited states.

The effect of two-photon absorption on the dynamic range of integrated microwave photonics links

2020 ◽  
Author(s):  
Jake A. Bass ◽  
Brandon Brea ◽  
Huong Tran ◽  
Wei Du ◽  
Richard Soref ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Microwave Photonics ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Protecting and accelerating adiabatic passage with time-delayed pulse sequences

2016 ◽  
Vol 18 (19) ◽  
pp. 13443-13448 ◽  
Author(s):  
Pablo Sampedro ◽  
Bo Y. Chang ◽  
Ignacio R. Sola
Keyword(s):  
Wave Packet ◽  
Computer Simulations ◽  
Ground State ◽  
Pulse Sequences ◽  
Photon Absorption ◽  
Rabi Oscillations ◽  
Adiabatic Passage ◽  
Two Photon Absorption ◽  
State Time ◽  
Two Photon

We study non-resonant two-photon absorption in the B band of Na2 with femtosecond pulses. The computer simulations show attenuated Rabi oscillations using coincident pulses that can be overcome by initially preparing a wave packet in the ground state. Time-delayed pulse sequences intrinsically protect the adiabatic passage of population, but the process can be accelerated starting with the packet.

Two-photon absorption properties of commercial fused silica and germanosilicate glass at 264 nm

2002 ◽  
Vol 80 (7) ◽  
pp. 1114-1116 ◽  
Author(s):  
Adrian Dragomir ◽  
John G. McInerney ◽  
David N. Nikogosyan ◽  
Peter G. Kazansky
Keyword(s):  
Fused Silica ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon

Accurate determination of two-photon absorption coefficients in fused silica and crystalline quartz at 264 nm

2001 ◽  
Vol 187 (1-3) ◽  
pp. 185-191 ◽  
Author(s):  
Joanne Nı́ Chróinı́n ◽  
Adrian Dragomir ◽  
John G McInerney ◽  
David N Nikogosyan
Keyword(s):  
Accurate Determination ◽  
Fused Silica ◽  
Photon Absorption ◽  
Absorption Coefficients ◽  
Crystalline Quartz ◽  
Two Photon Absorption ◽  
Two Photon

Two Photon Spectroscopy of Dithienyl Polyenes

1999 ◽  
Vol 561 ◽  
Author(s):  
Thomas M. Cooper ◽  
Paul A. Fleitz ◽  
Laura A. Sowards ◽  
Lalgudi V. Natarajan ◽  
Sean Kirkpatricky ◽  
...  
Keyword(s):  
Energy Gap ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Optical Limiters ◽  
Two Photon Absorption Coefficient ◽  
Photoinduced Charge ◽  
Transfer Mechanisms

ABSTRACTTo understand the properties of light-sensitive compounds used in optical limiters having photoinduced charge transfer mechanisms, we have investigated the photophysics of a series of di(2-thienyl-3,3'-butyl)polyenes. Spectroscopic measurements, including UV/Vis, fluorescence, fluorescence lifetimes, fluorescence quantum yields, triplet state lifetime, solvent effects and two-photon absorption coefficient were obtained as a function of the number of double bonds(n = 1-5). Trends in the data reflected the ordering, energy gap between and mixing of 1Bu* and 1Ag* excited state configurations.

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