Recent progress of organic nonlinear optics in Japan

Miyata, Seizo; Xu, Tao

doi:10.1016/s0379-6779(96)03765-4

Cited by 18 publications

(7 citation statements)

References 129 publications

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“…So, electric-field induced second harmonic (EFISH) generation or optical poling can be adopted to induce the noncentrosymmetric character in some of the NLO active chromopores. 5 In photoinduced second harmonic generation of BiB 3 O 6 (BiBO) glass having different degree of crystallinity, an increasing degree of crystallinity of BiBO glass leads to increase of the output second-order optical susceptibility. 6 Intrinsic defects in molecular crystals can induce second harmonic generation when subjected to a laser beam.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)

Krishnakumar

Kalyanaraman²,

Piasecki

et al. 2008

J Raman Spectroscopy

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We have established a possibility to obtain the photoinduced optical second harmonic generation in the initially centrosymmetric single crystals of tris(thiourea)copper(I) perchlorate crystallized in the monoclinic system with the space group P2 1 /c. The second-order susceptibility of the investigated crystal was measured by inducing the crystal by external laser field. The results obtained are interesting and discussed in detail. We have established that the optical second harmonic generation achieves its maximum (about 0.84 pm/V) at photoinducing power density about 1430 kW/cm 2 for the fundamental wavelength 1064 nm. The maximal output second harmonic generation (SHG) was achieved at an angle of about 35°b etween the pumping and fundamental power beam's polarizations. Such maximum may be a consequence of a competition between the so formed anharmonic photothermal expansions and the thermal destruction that occurred because of the heating of the crystal surfaces. Our independent verifications have shown that the photoinduced surfaces were heated up to 8-12°C. This may cause occurrence of photothermal relaxation processes. The output SHG exists only immediately after the act of photoinduction. The obtained dependences are caused by specific features of the Raman spectra of the investigated crystals.

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Section: Introductionmentioning

confidence: 99%

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)

Krishnakumar

Kalyanaraman²,

Piasecki

et al. 2008

J Raman Spectroscopy

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“…This was different from the one‐dimensional chromophores in which the contribution of the off‐diagonal components to β can be negative in most cases or pretty small so that it could be omitted. In addition, when it is embedded into a polymeric backbone, the off‐diagonal component contributions may be helpful in reducing the requirements for orientation before β of each chromophore contributing to the electrooptical coefficient of the polymer27 and in achieving more effective phase‐matched harmonic generation 10, 28. The β 0 of the chromophore was theoretically calculated at 21.3 × 10 −30 esu, and the ground‐state dipole moment μ g was 7.99 (D).…”

Section: Resultsmentioning

confidence: 99%

Design and synthesis of a thermally stable second‐order nonlinear optical chromophore and its poled polymers

Qin

Yang

Bai

et al. 2003

J. Polym. Sci. A Polym. Chem.

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A multiple charge‐transfer second‐order nonlinear optical (NLO) chromophore 2,3‐bis(4‐aminophenyl)‐5,6‐dicyanopyrazine (BAPDCP) was successfully designed and synthesized. It was characterized by 1H NMR, mass spectrometry, Fourier transform infrared spectroscopy, and elemental analysis. The first hyperpolarizability β of BAPDCP was measured with the Hyper–Rayleigh scattering technique, which was 123.5 × 10−30 esu. The donor‐embedded prepolyimide and prepolyurea were also synthesized by a polyaddition reaction. Thermogravimetric analysis and differential scanning calorimetry demonstrated that either the chromophore or the polymers have fine thermal stability. The thin films of prepolymers were prepared by coating on ITO glass substrate and poled by corona poling at elevating temperature. The second‐order NLO coefficients d33 of the films were measured by in situ second‐harmonic generation measurements. The d33 were deduced as 27.7 and 16.5 pm/V for polyurea and polyimide at 1064 nm fundamental wavelength, respectively. The onset depoling temperature of the polyimide and polyurea were both as high as 200 °C. To understand the temperature effect to the orientation thermal stability of polyimide, two films were treated at different final poling temperatures. The depoling experimental results showed that the orientation stability is higher, as raising the final treated temperature but the d33 value are almost similar. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 2846–2853, 2003

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“…The increasing demand on organic materials for technological applications, which includes optical frequency doublers, ultra-fast modulators, amplifiers and switches, has prompted researchers to look for newer promising materials [1][2][3][4][5]. One of the main criteria for SHG material is that its crystal structure lacks a centre of symmetry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, growth and characterization of 3-nitroacetanilide—A new organic nonlinear optical crystal by Bridgman technique

Lenin

Ramasamy

2008

Journal of Crystal Growth

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Recent progress of organic nonlinear optics in Japan

Cited by 18 publications

References 129 publications

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)

Design and synthesis of a thermally stable second‐order nonlinear optical chromophore and its poled polymers

Synthesis, growth and characterization of 3-nitroacetanilide—A new organic nonlinear optical crystal by Bridgman technique

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Recent progress of organic nonlinear optics in Japan

Cited by 18 publications

References 129 publications

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH2)2)3(ClO4)

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH2)2)3(ClO4)

Design and synthesis of a thermally stable second‐order nonlinear optical chromophore and its poled polymers

Synthesis, growth and characterization of 3-nitroacetanilide—A new organic nonlinear optical crystal by Bridgman technique

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Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)

Photoinduced second harmonic generation studies on Tris(thiourea)copper(I) perchlorate Cu(SC(NH₂)₂)₃(ClO₄)