Analysis of a first‐order reflection grating with second‐harmonic generation

1991 ◽  
Vol 69 (3) ◽  
pp. 1201-1204 ◽  
Author(s):  
Z. Weissman ◽  
A. Hardy ◽  
E. Marom ◽  
S. R. J. Brueck
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
First Order ◽  
Reflection Grating ◽  
Order Reflection

First Order Quasi-Phase-Matched Second-Harmonic Generation in LiTaO3 Utilizing a Periodic Domain Inversion Created by an External Stress

1993 ◽  
Vol 329 ◽  
Author(s):  
Thomas A. Strasser ◽  
Rishi Raj
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Phase Match ◽  
Periodic Domain ◽  
Quasi Phase Match ◽  
First Order ◽  
Generation Structure ◽  
Domain Inversion ◽  
Periodic Domain Inversion

AbstractFirst order quasi-phase-matching in a proton exchanged LiTaO3 channel waveguide structure is reported, where the periodic domain inversion is created by the application of a periodic compressive stress near the Curie temperature. The processing conditions, driving force, and effects on resulting domain structure is reported, including the observation of domain structures with periods as small as 0.36 μm. A waveguide second-harmonic generation structure with a periodic 3.45 μm domain inversion structure is fabricated and evaluated to quasi-phase-match 420 nm blue light with 840 nm output available from standard laser diode sources.

Second-harmonic generation from a first-order quasi-phase-matched GaAs/AlGaAs waveguide crystal

2001 ◽  
Vol 26 (24) ◽  
pp. 1984 ◽  
Author(s):  
E. U. Rafailov ◽  
P. Loza-Alvarez ◽  
C. T. A. Brown ◽  
W. Sibbett ◽  
R. M. De La Rue ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
First Order

scholarly journals Second Harmonic Generation, Electrooptical Pockels Effect, and Static First-Order Hyperpolarizabilities of 2,2′-Bithiophene Conformers: An HF, MP2, and DFT Theoretical Investigation

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Andrea Alparone
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Density Functional ◽  
Second Harmonic ◽  
Second Order ◽  
Pockels Effect ◽  
First Order ◽  
Hartree Fock ◽  
Electron Correlation Effects ◽  
Moller Plesset

The static and dynamic electronic (hyper)polarizabilities of the equilibrium conformations of 2,2′-bithiophene (anti-gauche and syn-gauche) were computed in the gas phase. The calculations were carried out using Hartree-Fock (HF), Møller-Plesset second-order perturbation theory (MP2), and density functional theory methods. The properties were evaluated for the second harmonic generation (SHG), and electrooptical Pockels effect (EOPE) nonlinear optical processes at the typical λ=1064 nm of the Nd:YAG laser. The anti-gauche form characterized by the S–C2–C2′–S dihedral angle of 137° (MP2/6-311G**) is the global minimum on the potential energy surface, whereas the syn-gauche rotamer (S–C2–C2′–S = 48°, MP2/6-311G**) lies ca. 0.5 kcal/mol above the anti-gauche form. The structural properties of the gauche structures are rather similar to each other. The MP2 electron correlation effects are dramatic for the first-order hyperpolarizabilities of the 2,2′-bithiophenes, decreasing the HF values by ca. a factor of three. When passing from the anti-gauche to the syn-gauche conformer, the static and frequency-dependent first-order hyperpolarizabilities increase by ca. a factor of two. Differently, the electronic polarizabilities and second-order hyperpolarizabilities of these rotamers are rather close to each other. The syn-gauche structure could be discriminated from the anti-gauche one through its much more intense SHG and EOPE signals.

SECOND-HARMONIC GENERATION OF FLUORESCENT PROTEINS

2013 ◽  
Vol 12 (08) ◽  
pp. 1341007
Author(s):  
JING WEI ◽  
MIN-YI ZHANG ◽  
JIN-YUN WANG ◽  
GUO-LIANG CHAI ◽  
CHEN-SHENG LIN ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Density Functional ◽  
Nonlinear Optical ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Second Harmonic ◽  
Water Medium ◽  
First Order ◽  
Polarized Continuum Model

We theoretically study the second-order nonlinear optical properties of six fluorescent proteins (FPs), such as green fluorescent protein (GFP), BFP, enhanced BFP (eBFP), CFP, YFP, and DsRed. To begin with, the geometries of all these FP chromophores are optimized at B3LYP/6-311++G** level in a water medium and the polarized continuum model (PCM in water) method is adopted. Using a time-dependent density functional theory (TDDFT) method, the electronic structures and excited-state properties of chromophores are determined. Here we employ TDDFT combining with the sum-over-states (SOS) method to calculate the first-order hyperpolarizability for second-harmonic generation (SHG) optical process. Moreover, we discuss the origin of the nonlinear optical response and determine what caused the variation of first-order hyperpolarizability. Our calculations show that the charge transfers of π → π* in the central conjugated structure and p → π* charge transfers from the side chain R1 to conjugated structure of chromophores markedly affect the first-order hyperpolarizability.

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