THEORY OF TWO-PHOTON ABSORPTION

1967 ◽  
Vol 45 (8) ◽  
pp. 2513-2524 ◽  
Author(s):  
R. Guccione-Gush ◽  
H. P. Gush ◽  
J. Van Kranendonk
Keyword(s):  
Transition Probability ◽  
Single Mode ◽  
Multipole Expansion ◽  
Photon Absorption ◽  
Matrix Formalism ◽  
Stationary Field ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Density Matrix Formalism ◽  
Simple Evaluation

The two-photon absorption process is discussed using a density matrix formalism. The electromagnetic field is described by means of coherent states, a technique that permits a simple evaluation of the effect of coherence on the transition probability. It is concluded that the latter is the same for a coherent and an incoherent pulse of radiation. In the case of a stationary field containing many modes, the transition probability is nearly the same in the coherent and incoherent cases, whereas for a single mode the transition probability is twice as high for the incoherent field. These conclusions are independent of the multipole expansion of the interaction Hamiltonian and are valid for electric dipole and higher multipole transitions.

Two-Photon Absorption Light-Induced Self-Written Waveguide for Single-Mode Optical Interconnection

2018 ◽  
Vol 36 (12) ◽  
pp. 2478-2483 ◽  
Author(s):  
Freddy Tan ◽  
Hidetaka Terasawa ◽  
Okihiro Sugihara ◽  
Akari Kawasaki ◽  
Tatsuya Yamashita ◽  
...  
Keyword(s):  
Single Mode ◽  
Photon Absorption ◽  
Optical Interconnection ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Two-photon absorption effects on Raman gain in single mode As_2Se_3 chalcogenide glass fiber

2008 ◽  
Vol 16 (22) ◽  
pp. 18524 ◽  
Author(s):  
A. Tuniz ◽  
G. Brawley ◽  
D. J. Moss ◽  
B. J. Eggleton
Keyword(s):  
Glass Fiber ◽  
Chalcogenide Glass ◽  
Single Mode ◽  
Photon Absorption ◽  
Raman Gain ◽  
Two Photon Absorption ◽  
Two Photon

NON-RESONANT TWO-PHOTON ABSORPTION CONTROL BY TWO TIME-DELAYED LASER PULSES

2013 ◽  
Vol 22 (01) ◽  
pp. 1350008 ◽  
Author(s):  
CHENHUI LU ◽  
SHIAN ZHANG ◽  
TIANQING JIA ◽  
JIANRONG QIU ◽  
ZHENRONG SUN
Keyword(s):  
Time Delay ◽  
Excited States ◽  
Molecular System ◽  
Transition Probability ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Carrier Envelope Phase ◽  
Two Photon ◽  
Absorption Control

In this paper, we theoretically investigate the control of the non-resonant two-photon absorption induced by two time-delayed laser pulses, and an analytical solution for the dependence of the two-photon transition probability on the time delay and relative carrier-envelope phase of the two laser pulses is achieved. We show that the two-photon absorption can be significantly enhanced or completely suppressed by varying the time delay between the two laser pulses or their relative carrier-envelope phase. We also show that the two-photon absorption can be selectively excited when two excited states are simultaneously excited. Furthermore, we discuss the two-photon absorption control in the molecular system and analyze the effect of the absorption bandwidth on the control efficiency of the two-photon absorption.

scholarly journals Measurement of two-photon absorption by gold nanoparticles of different sizes photodeposited onto the core of an optical fibre

2021 ◽  
Vol 61 (1) ◽  
Author(s):  
J.M. Cuvas-Limón ◽  
J.G. Ortega-Mendoza ◽  
J.P. Padilla-Martínez ◽  
P. Zaca-Morán
Keyword(s):  
Gold Nanoparticles ◽  
Optical Fibre ◽  
Continuous Wave ◽  
Nonlinear Coefficient ◽  
Single Mode ◽  
High Gain ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The Core

In this work, the study of two-photon absorption by gold nanoparticles of different diameters photodeposited onto the core of a single-mode optical fibre is presented. The photodeposition of nanoparticles with diameters of 10, 20, 50 and 100 nm was achieved using a continuous wave laser at a wavelength of 1550 nm and a power of 50 mW. Nonlinear optical characterization was carried out by using the P-scan technique of a high gain erbium doped fibre amplifier with pulses of 20 ns at a frequency of 10 kHz, that provides a maximum intensity of approximately 60 MW/cm2. The results show that for gold nanoparticles greater than 20 nm photodeposited onto the fibre, in both cases, the nonlinear coefficient as well as the third-order susceptibility increase as the diameter of the nanoparticles increases, describing a typical behaviour of the two-photon absorption. The obtained results can be used for the design of filters and optical limiters in the communications area.

Sign in / Sign up

Export Citation Format

Share Document