Development of DAST-derivative crystals for terahertz waves generation

Crystal Engineering of Acentric Styryl Quinolinium Crystals with Strongly Hydrogen-Bonded Phenolic Anions

“…In particular, for second-order (quadratic) nonlinear optical applications, a noncentrosymmetric molecular arrangement in the crystalline state is crucial. − Noncentrosymmetric crystals based on heteroaromatic pyridinium cations exhibit excellent nonlinear optical properties. Since the reporting of 4-(4-(dimethylamino)­styryl)-1-methylpyridinium 4-methylbenzenesulfonate (DAST) crystal in 1989, based on the Coulomb interaction between a pyridinium cation and a sulfonate anion, with large macroscopic optical nonlinearities, , many styryl pyridinium derivatives with various counteranions have been reported. − In order to optimize the molecular ordering of styryl pyridinium chromophores in the crystalline state and their crystal characteristics, various hydrogen-bonded groups such as hydroxyl, carboxyl, and amine groups have been incorporated in aromatic sulfonate anions. − …”

Pump-beam-induced optical damage depended on repetition frequency and pulse width in 4-dimethylamino-N ′-methyl-4′-stilbazolium tosylate crystal

“…In both the cases of 15-ns pulse duration and 600-ps duration, we demonstrated that the thermal effects in DAST crystals dominated the optical damage, which depended on thermal accumulation and dissipation. Organic nonlinear optical (NLO) crystal 4-dimethylamino-N 0 -methyl-4 0 -stilbazolium tosylate (DAST), 1,2 with its large nonlinearity, is a promising material for efficiently generating terahertz (THz) waves by second-order NLO processes such as difference frequency generation (DFG) 3-8 and optical rectification (OR), [9][10][11][12][13] as well as for detecting THz waves with high sensitivity by nonlinear up-conversion. 14 In particular, tunable THz-wave generation and monochromatic coherent detection have been developed for many THz-wave applications.…”

Bulk crystal growth and nonlinear optical characterization of a stilbazolium derivative crystal: 4-[2-(3,4-dimethoxyphenyl)ethenyl]-l methylpyridinium tetraphenylborate (DSTPB) for NLO device fabrication

“…86,87 From the closed aperture Z-scan data, the difference between the normalized valley and peak transmittances (ΔT p-v ), as seen in Fig. 6b can be obtained using the relationship 81,88,89 ΔT p-v ¼ 0.406(1 À S) 0.25 |ΔF 0 | (11) where S is the linear transmittance of the aperture in the absence of a sample which is obtained using the following relationship 85…”

“…[3][4][5][6][7] Among the organic and inorganic crystals studied, organic stilbazolium derivatives have attracted considerable attention due to their large second-order optical nonlinearity, modulation of laser reading, terahertz (THz) wave applications including THz detection and generation. [8][9][10][11][12] The original reason for this is due to the presence of active hydrogen bonds with a p-conjugated system and Coulomb interactions between a stilbazolium cation and counter anion. [13][14][15][16][17] The experimental results also showed a combination of large NLO response with better mechanical properties, low dielectric constant, photochemical, and thermal stability.…”