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 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.

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-IR Polymethine Molecule with a Broken Ground-State Symmetry

2011 ◽  
Author(s):  
Honghua Hu ◽  
Dmitry Fishman ◽  
Scott Webster ◽  
Olga V. Przhonska ◽  
Julia L. Bricks ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Near Ir

Red to Green Upconversion in Er3+-Doped BaTiO3 Nanorods

2008 ◽  
Vol 8 (12) ◽  
pp. 6564-6568 ◽  
Author(s):  
Márcio A. R. C. Alencar ◽  
Glauco S. Maciel ◽  
Cid B. de Araújo ◽  
Amitava Patra
Keyword(s):  
Excited State ◽  
Excitation Spectrum ◽  
Ground State ◽  
Laser Power ◽  
Excited State Absorption ◽  
Photon Absorption ◽  
Absorption Process ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Upconversion Emissions

We investigated the frequency upconversion (UC) process in BaTiO3:Er3+ nanocrystals for excitation wavelengths in the range 638 to 660 nm. Green upconversion emissions at 526 and 547 nm corresponding to 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 to transitions of the Er3+ were observed. The excitation spectrum for UC emissions presented three bands, due to ground state and excited state absorption of Er3+ ions. The UC intensity as a function of the laser power was investigated and it was found this a two-photon absorption process.

An improved singlet oxygen sensitizer with two-photon absorption and emission in the biological transparency window as a result of ground state symmetry-breaking

2012 ◽  
Vol 48 (11) ◽  
pp. 1689-1691 ◽  
Author(s):  
Thibault Gallavardin ◽  
Chloé Armagnat ◽  
Olivier Maury ◽  
Patrice L. Baldeck ◽  
Mikael Lindgren ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Singlet Oxygen ◽  
Ground State ◽  
Transparency Window ◽  
Photon Absorption ◽  
Absorption And Emission ◽  
Two Photon Absorption ◽  
Two Photon
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