Superior characteristics of organic chalcone single crystals as efficient nonlinear optical material

Abstract

High-quality biaxial single crystals of chalcone derivatives were grown by solution growth technique. Their molecular structures were designed to possess large second-order nonlinearities by choosing proper donor/acceptor groups while retaining a high transparency in the visible and infrared spectral regions. The second-order nonlinear optical coefficients, determined by applying the Maker fringe technique, were found to be much larger than those of LiB3O5, KTiOPO4, KH2PO4, and urea. The advantages, such as easy synthesis and crystal growth, low cutoff wavelength (<450nm), large optical nonlinearity, and high damage threshold (>7.2GW∕cm2), make these organic crystals promising for efficient frequency doubling.

Growth and characterization of an efficient nonlinear optical D–π–A–π–D type chalcone single crystal

“…The damage on the crystal could be due to the heating effect caused by linear absorption, and consequently the lower damage threshold at 532 nm could be due to higher linear absorption in the crystal. The laser damage threshold of PDBA was much higher than those of well-known potassium titanyl phosphate (KTP; 42, 4 GW/cm 2 at 1064 nm and 42 GW/cm 2 at 532 nm), potassium dihydrogen phosphate (KDP; 40.25 GW/cm 2 at 1064 nm and 48 GW/cm 2 at 532 nm [21] and other organic crystals, such as CDBA [19] and urea [31].…”

“…The d-coefficients of PDBA crystal were determined using Maker fringe technique and the details of the measurement are presented elsewhere [21]. As-grown single crystals of PDBA having good surface quality and flatness allowed us to determine the second-order NLO d-coefficients.…”

Synthesis, crystal growth, characterization and structure–NLO property relationship in 1,3-bis(4-methoxyphenyl)prop-2-en-1-one single crystal

“…Chalcones are interesting organic NLO materials that show good crystallizability, high SHG conversion efficiency compared to urea and transparency extending down to the blue region [8][9][10][11][12][13][14]. From the past investigations on these molecules it was shown that these molecules show a higher SHG response when a p-electron acceptor group is substituted at the para position of the benzoyl group rather than at the phenylene group.…”

Synthesis, crystal growth and characterization of a D-π-A type novel organic nonlinear optical single crystal

“…The substitution of electron acceptors/donors on either of the phenyl rings of chalcones greatly influences the noncentrosymmetric crystal packing structures required for second harmonic generation (SHG) [8]. It was suggested by Zhao et al [9] that electron donors such as -OCH 3 , -CH 3 , -Cl and -Br are the best donor groups for enhancing SHG in chalcones.…”

“…Chalcones are a class of cross conjugated NLO chromophores that exhibit high SHG efficiency, good crystallizability and excellent blue light transmittance [7,8]. The substitution of electron acceptors/donors on either of the phenyl rings of chalcones greatly influences the noncentrosymmetric crystal packing structures required for second harmonic generation (SHG) [8].…”