Electro-optic properties of the organic salt 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate

Abstract

We show that the organic salt 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) is a very interesting material for electro-optic applications in the near infrared. The electro-optic coefficients, namely r111, r221, r331, r113, r223, and r333, were determined in the spectral range of 700 up to 1535 nm using optical samples cut from large high quality bulk crystals. DAST combines large electro-optic coefficients, e.g., r111=77±8 pm/V at λ=800 nm and r111=47±8 pm/V at λ=1535 nm, with low dielectric constants, e.g., ε1=5.2±0.4. This combination leads to large polarization-optical coefficients.

Generation of widely tunable Fourier-transform-limited terahertz pulses using narrowband near-infrared laser radiation

“…3b. The normalized THz peak power is about 10 times smaller than indicated by our simulations [46] based on the reported optical and THz properties of the DAST crystal [24,26,[47][48][49][50] and the well-known formula for the output power of difference-frequency generation [51,52]. The same observation was made for the normalized THz peak powers generated in the crystals of ZnTe and GaP (see Section III B).…”

“…The organic crystalline salt 4-N ,N -dimethylamino-4 ′ -N ′ -methyl stilbazolium tosylate (DAST) possesses very high nonlinear susceptibilities and electro-optic coefficients, which makes it one of the best nonlinear materials for THz generation and detection up to date [24]. THz radiation has so far been generated in DAST by optical rectification (OR) of a single fs laser pulse [25,26] and by DFG using two ns laser pulses [27][28][29][30][31].…”

Noncollinear type-II second-harmonic generation in a Al(0.3)Ga(0.7)As/Al2O3 one-dimensional photonic crystal

“…15 The measured conversion efficiency was D (ϩ) ϭ(3.4Ϯ0.1)ϫ10 Ϫ2 . Substituting the experimental data and the refractive indices for DAST 14 and for the sample 6 in Eq. ͑2͒, we calculated by comparison:…”

“…For this calibration we used a crystal known in the literature with the acronym DAST. 14 The crystal was 1.5 mm long, with d eff ϭ͑15Ϯ3͒ pm/V for SHG at 1530 nm. 15 The measured conversion efficiency was D (ϩ) ϭ(3.4Ϯ0.1)ϫ10 Ϫ2 .…”

DAST/SiO_2 multilayer structure for efficient generation of 6 THz quasi-single-cycle electromagnetic pulses

“…DAST is a very attractive material for generating THz waves because of its high nonlinearity (d 111 615 pm V −1 at 800 nm) [17]. Around 1 THz, the effective nonlinearity of DAST is higher than that of LiNbO 3 and ZnTe by factors of 3.7 and 9, respectively [1].…”