SECOND HARMONIC GENERATION IN Λ-SHAPED ORGANIC MOLECULES

2008 ◽  
Vol 17 (03) ◽  
pp. 329-338 ◽  
Author(s):  
MALYAJ DAS ◽  
RASHMI TRIVEDI ◽  
B. Q. KHATTAK ◽  
P. RAMSHANKAR ◽  
PRATIMA SEN ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Organic Molecules ◽  
Second Harmonic ◽  
Theoretical Calculations ◽  
Geometry Optimization ◽  
Polymer Chains ◽  
Diphenyl Sulfone ◽  
Active Moiety ◽  
Nlo Materials

In epoxy based polymeric nonlinear optical (NLO) materials, the nonlinear optically active moiety forms crosslink between polymer chains. Some of the important moieties include 4, 4'diamino diphenyl sulfone (DADS). We have examined second harmonic generation (SHG) in DADS and have compared it with 4, 4'diamino diphenyl methane (DADM). The geometry optimization suggests that both molecules have Λ-shaped structure. The theoretical calculations as well as experimental observations of SHG in both the molecules suggest the suitability of DADS over DADM for making polymeric NLO materials.

Two rare-earth-based quaternary chalcogenides EuCdGeQ4 (Q = S, Se) with strong second-harmonic generation

2019 ◽  
Vol 48 (47) ◽  
pp. 17620-17625 ◽  
Author(s):  
Wenhao Xing ◽  
Naizheng Wang ◽  
Yangwu Guo ◽  
Zhuang Li ◽  
Jian Tang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Melting Behavior ◽  
Band Gaps ◽  
Metal Chalcogenides ◽  
Congruent Melting ◽  
Nlo Materials

Two RE-based quaternary metal chalcogenides EuCdGeQ4 (Q = S, Se) are discovered. They possess many attractive properties as preferred IR NLO materials including large band gaps, phase-matched intense SHG and congruent melting behavior.

Frequency-Dependent Second Harmonic Generation in Acentric Chromophoric Self-Assembled NLO Materials

1994 ◽  
Vol 351 ◽  
Author(s):  
Shlomo Yitzchaik ◽  
Paul M. Lundquist ◽  
Weiping Lin ◽  
David R. Kanis ◽  
Mark A. Ratner ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Self Assembly ◽  
Second Harmonic ◽  
Second Order ◽  
Frequency Dependent ◽  
Aligned Arrays ◽  
Nlo Materials ◽  
Charge Transfer Excitation ◽  
Self Assembled

ABSTRACTAn attractive and challenging approach to the construction of robust, thin film materials with large second-order optical nonlinearities is the covalent self-assembly of aligned arrays of high-β molecular chromophores into multilayer superlattices. In this paper, we describe the dispersion of second harmonic generation (SHG) in a self-assembled (SA) monolayer containing a stilbazolium chromophore. The frequency-dependent measurements were performed on 25 Å thick monolayers on glass using a tunable (0.4–2 μm) light source based on optical parametric amplification (OPA). The SHG spectrum contains a clear two-photon resonance at hω = 1.3eV. The maximum in the second-order susceptibility coincides with a low energy chromophore-centered charge-transfer excitation at 480 nm. The experimental SHG dispersion values compare favorably with theoretical results computed using a sum-over-states (SOS) formalism. However, the measured values exhibit a somewhat broader band response than the theoretical curve, and the origin of this behavior is discussed.

scholarly journals [A3X][Ga3PS8] (A = K, Rb; X = Cl, Br): promising IR non-linear optical materials exhibiting concurrently strong second-harmonic generation and high laser induced damage thresholds

2016 ◽  
Vol 7 (9) ◽  
pp. 6273-6277 ◽  
Author(s):  
Bin-Wen Liu ◽  
Hui-Yi Zeng ◽  
Xiao-Ming Jiang ◽  
Guan-E Wang ◽  
Shu-Fang Li ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Optical Materials ◽  
Second Harmonic ◽  
High Laser ◽  
Non Linear ◽  
Nlo Materials ◽  
Linear Optical ◽  
Laser Induced Damage

We have developed a new series of salt-inclusion chalcogenides, which are promising IR-NLO materials exhibiting large second-harmonic generation and high laser-induced damage thresholds.

CERENKOV-TYPE OPTICAL SECOND-HARMONIC GENERATION IN ORGANIC-CRYSTALLINE CHANNEL WAVEGUIDES

1992 ◽  
Vol 01 (02) ◽  
pp. 367-392 ◽  
Author(s):  
TAKASHI KONDO ◽  
NAOKI HASHIZUME ◽  
KEIJI TSUDA ◽  
RYUJI MORITA ◽  
RYOICHI ITO ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Theoretical Calculations ◽  
Planar Waveguides ◽  
Optimum Conditions ◽  
Nonlinear Optical Crystal ◽  
Optical Second Harmonic Generation ◽  
Channel Waveguides ◽  
Harmonic Power

Cerenkov-type optical second-harmonic generation (SHG) in organic-crystalline waveguides has been investgated. Various techniques for the fabrication of organic-crystalline waveguides are described. Planar and channel waveguides have been fabricated using an organic nonlinear optical crystal (−)2-(α-methylbenzylamino)-5-nitropyridine (MBANP). Visible blue light has been obtained in an MBANP rib waveguide using a laser-diode source. Theoretical analysis of Cerenkov-type SHG in planar waveguides is made, and a simple analytic expression for second-harmonic power is derived. Optimum conditions for attaining high conversion efficiency are discussed on the basis of the theoretical calculations.

GEOMETRY OPTIMIZATION AND SECOND HARMONIC GENERATION IN PARA-NITROANILINE–DIMETHYL FORMAMIDE ADDUCT

2008 ◽  
Vol 17 (01) ◽  
pp. 85-96 ◽  
Author(s):  
MALYAJ DAS ◽  
RASHMI TRIVEDI ◽  
PRANAY K. SEN ◽  
B. Q. KHATTAK ◽  
P. RAM SHANKAR ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Geometry Optimization ◽  
Dipolar Interaction ◽  
Adduct Formation ◽  
Dimethyl Formamide ◽  
Polar Molecules ◽  
Shg Efficiency

Para-nitroaniline(p- NA )–dimethyl formamide (DMF) adduct has been synthesized chemically. The formation of adduct is confirmed via UV, FTIR, CHN analyses and other techniques. The adduct formation takes place due to dipolar interaction and hydrogen bonding. The parent polar molecules, viz. p- NA and DMF, crystallize in symmetric forms and do not exhibit optical second harmonic generation (SHG). The adduct has been found to exhibit a considerable SHG efficiency and hence this confirms that the adduct crystallizes in a noncentrosymmetric form. These observations suggest a Λ-shaped structure of the molecule, which is further established theoretically via geometry optimization.

Fluoroborophosphates: a family of potential deep ultraviolet NLO materials

2019 ◽  
Vol 6 (3) ◽  
pp. 723-730 ◽  
Author(s):  
Baolin Wu ◽  
Chunli Hu ◽  
Ruling Tang ◽  
Feifei Mao ◽  
Jianghe Feng ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Uv Absorption ◽  
Nlo Materials ◽  
Deep Ultraviolet ◽  
Absorption Edges

A series of new fluoroborophosphates obtained by combining BO3F or BO2F2 with a PO4 tetrahedron exhibit short UV absorption edges and display second-harmonic generation signals.

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