Effects of spectral diffusion on the nonlinear optical properties in two- and three-state quantum systems in a four-wave mixing signal

2018 ◽  
Vol 27 (04) ◽  
pp. 1850038
Author(s):  
F. Moncada ◽  
J. L. Paz ◽  
L. Lascano ◽  
C. Costa-Vera
Keyword(s):  
Nonlinear Optical ◽  
Relaxation Times ◽  
Potential Method ◽  
Four Wave Mixing ◽  
Quantum Systems ◽  
Spectral Diffusion ◽  
Nonlinear Susceptibility ◽  
Matrix Formalism ◽  
Wave Mixing ◽  
Potential Applications

Effects of spectral diffusion on the third-order nonlinear susceptibility for two- and three-level quantum systems, immersed in a thermal reservoir, are evaluated with a four-wave mixing (FWM) signal through the density matrix formalism. For this, inhomogeneously broadened two- and three-level quantum systems are used. In these models, the distribution of natural frequencies follows a Lorentzian function. The absorptive and dispersive nonlinear optical responses are determined for the considered quantum models. The results presented in this work show potential applications in the development of optical switches and provide a potential method to measure spectral diffusion relaxation times in three-level quantum systems.

Four-wave mixing signal intensity: Relaxation time effects on the absorptive and dispersive optical properties in a two-level system

2015 ◽  
Vol 24 (02) ◽  
pp. 1550023
Author(s):  
J. L. Paz ◽  
Luis G. Rodríguez ◽  
Cesar Costa-Vera
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Level System ◽  
Time Effects ◽  
Frequency Space ◽  
Signal Response

A study of the effects of relaxation times on the Four-Wave Mixing (FWM) signal response in frequency space for a two-level system is presented where the collisional effects of the solvent and the presence of the electromagnetic field are considered. The model is a generalization of the conventional two-level approach in that it includes a simplified description of the molecular structure associated with the non-zero permanent dipole moments. Significant changes in both the FWM-intensity and nonlinear optical properties are observed, due mainly to changes in the ratio between the longitudinal and transversal relaxation times.

scholarly journals Four-wave mixing and enhanced analog Hawking effect in a nonlinear optical waveguide

2019 ◽  
Vol 99 (4) ◽  
Author(s):  
Scott Robertson ◽  
Charles Ciret ◽  
Serge Massar ◽  
Simon-Pierre Gorza ◽  
Renaud Parentani
Keyword(s):  
Optical Waveguide ◽  
Nonlinear Optical ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Hawking Effect

Theoretical and Experimental Studies of Third-Order Nonlinear Optical Susceptibilities of New p-N,N'-Diamethylaniline Tetrathiafulvalene Derivatives

2000 ◽  
Vol 660 ◽  
Author(s):  
B. Sahraoui ◽  
K.J. Pluciński ◽  
M. Makowaska-Janusik ◽  
I. V. Kityk ◽  
M. Salle ◽  
...  
Keyword(s):  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Nonlinear Optical ◽  
Experimental Studies ◽  
Physical Nature ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Electronic Contribution ◽  
Optical Nonlinearities ◽  
Third Order

ABSTRACTA study was made of third-order nonlinear optical susceptibilities of new tetrathiafulvalene (TTF) derivatives, using the degenerate four wave mixing (DFWM) method, as well as complex quantum chemical calculations. To understand the physical nature of the optical nonlinearities, we separated their electronic and nuclear contributions. We found that the electronic contribution to these nonlinearities predominated. Our investigations suggest that TTF may be a highly promising material for nonlinear optics (NLO).

scholarly journals Generalized Kramers–Kronig relations and sum rules for moments and powers of degenerate four wave mixing susceptibility

2021 ◽  
Author(s):  
Jarkko J. Saarinen
Keyword(s):  
Sum Rules ◽  
Terahertz Spectroscopy ◽  
Theoretical Models ◽  
Present Theory ◽  
Four Wave Mixing ◽  
Dispersion Relations ◽  
Nonlinear Susceptibility ◽  
Complex Frequency ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing

AbstractGeneralized Kramers–Kronig (K–K) type dispersion relations and sum rules are derived in the static limit for the moments of the degenerate four wave mixing susceptibility. The degenerate nonlinear susceptibility is different from a typical use of the conventional K–K dispersion relations, which assume absence of complex poles of a function in the upper half of complex frequency plane, whereas degenerate susceptibility has simultaneous poles in both half planes. In the derivation of the generalized K–K relations the poles and their order are taken into account by utilization of the theorem of residues. The conventional K–K relations can be used to estimate the real and imaginary parts of the second and higher powers of the susceptibility as the effect of the poles is reduced due to a faster convergence of the dispersion relations. The present theory is directly applicable to higher order susceptibilities and can be used in testing of theoretical models describing the degenerate four wave mixing susceptibility in nonlinear optical and terahertz spectroscopy.

HIGHLY ACCURATE WAVELENGTH SCANNED FOUR-WAVE MIXING EXPERIMENT IN AN OPTICAL FIBER AND DEMONSTRATION OF RETRIEVAL OF ITS LINEAR AND NONLINEAR OPTICAL PARAMETERS

2006 ◽  
Vol 15 (01) ◽  
pp. 141-156
Author(s):  
S. J. JUNG ◽  
J. Y. LEE ◽  
D. Y. KIM
Keyword(s):  
Optical Fiber ◽  
Nonlinear Optical ◽  
Chromatic Dispersion ◽  
Tunable Laser ◽  
Four Wave Mixing ◽  
Optical Parameters ◽  
Wave Mixing ◽  
Dependent Change ◽  
Measurement Results ◽  
Linear And Nonlinear

Accurate wavelength scanned four-wave mixing (FWM) measurement results in an optical fiber are presented with two tunable laser sources near the dispersion-zero wavelength of the fiber. By comparing the measured FWM data with a simple analytic expression, we have demonstrated that important linear and nonlinear optical properties such as zero-dispersion wavelength, dispersion slope and nonlinear refractive index of the sample fiber. Highly accurate and repeatable measurement results for a sample fiber are presented. Temperature-dependent change in the chromatic dispersion of a fiber is also investigated.

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