Modified czochralski growth of nonlinear optical organic crystals

Aggarwal, Mohan D.; Wang, W.S.; Tambwe, M.

doi:10.1016/0025-5408(92)90020-z

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…In recent years there has been an increasing interest in using nonlinear optics produced by different organic materials [6][7][8][9], including molecular crystals of some aromatic compounds such as benzyl and benzophenone [10][11][12][13][14]. A study of the nonlinear properties of extensively purified solution-grown pyrene crystals, in which their morphological, topographical and structural qualities are characterized by optical goniometry and x-ray methods [15], is presented in this work.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced second harmonic generation in molecular crystals caused by defects

Kityk

Marciniak

Mefleh

2000

J. Phys. D: Appl. Phys.

138

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We have found optical photoinduced second harmonic generation in pyrene molecular crystals photoinduced by intrinsic defects. A correlation between the number of macro-vacancies (defects) measured by positron annihilation and second-order nonlinear optical susceptibilities indicates the appearance of additional non-centrosymmetry in the electron charge density distribution caused by the defects. Simultaneously, changes in the kinetics of phenomena in the picosecond time regime are demonstrated. The latter indicate the essential role of intra- and intermolecular contributions in the observed phenomena.

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Section: Introductionmentioning

confidence: 99%

Photoinduced second harmonic generation in molecular crystals caused by defects

Kityk

Marciniak

Mefleh

2000

J. Phys. D: Appl. Phys.

138

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“…Earlier study of electrooptics (Pockels) properties of pyrene crystals, which morphology, topographical and structural perfection are very close to benzene [10,11] showed strong dependence of electrooptics on number of macrodefects [12]. Because study of the EOE in the bulk crystals is restrained by the difficulties of obtaining the crystals of good optical quality and of relatively large sizes, in the present work we will investigate the EOE for benzene crystallites with averaged sizes equal about 80-100 nm incorporated within the polyvinyl alcohol (PVA) photopolymer matrices, similarly as it was done in [13].…”

Section: Introductionmentioning

confidence: 97%

Photoinduced piezooptic effect in the benzene molecular crystallites incorporated within the polyvinyl alcohol matrices

Ozga¹

2004

Chemical Physics Letters

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“…9 In the Czochralski technique, it is very difficult to stabilize the growth of benzil. [10][11][12] In the Bridgman technique, benzil crystals were grown by using single wall ampoules. 7,12,13 As better quality single crystals are needed for device application, it is necessary to improve the method of growth.…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of benzil single crystals using nanotranslation by the modified vertical Bridgman technique

Suthan¹,

Dhanaraj²,

Rajesh³

et al. 2011

CrystEngComm

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Benzil single crystals have been grown by the modified vertical Bridgman technique using the double wall ampoule with nanotranslation for the first time. The characterization studies of benzil crystals grown by both single and double wall ampoules were analyzed. The grown benzil crystal was confirmed by single crystal and powder X-ray diffraction analyses. Fourier transform infrared analysis confirms the functional groups of the grown benzil. High resolution X-ray diffraction analysis indicates the crystalline perfection of the grown crystals. The UV-Vis-NIR studies show that the grown benzil crystals cutoff wavelength is around 434 nm. The green emission of the grown benzil was identified by photoluminescence studies. The thermal property of the grown benzil was studied by thermogravimetric and differential thermal analyses. The dielectric measurements of benzil crystals were carried out with different frequencies and temperatures and the results indicate an increase in dielectric and conductivity parameters with the increase of temperature at all frequencies. The second harmonic conversion efficiency of the grown benzil was determined.

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Modified czochralski growth of nonlinear optical organic crystals

Cited by 11 publications

References 6 publications

Photoinduced second harmonic generation in molecular crystals caused by defects

Photoinduced second harmonic generation in molecular crystals caused by defects

Photoinduced piezooptic effect in the benzene molecular crystallites incorporated within the polyvinyl alcohol matrices

Growth and characterization of benzil single crystals using nanotranslation by the modified vertical Bridgman technique

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