Monoclinic ethylenediamine (+)-tartrate (NH3CH2CH2NH3)((+)-C4H4O6) (EDT) – a new organic non-centrosymmetric crystal for Raman laser converters with large (≈3000 cm–1) frequency shifts
✍ Scribed by A. A. Kaminskii; L. Bohatý; P. Becker; H. J. Eichler; H. Rhee; M. Maczka; J. Hanuza
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 344 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
Our investigations reveal the nonlinear-laser properties of monoclinic organic ethylenediamine (+)-tartrate (NH 3 CH 2 CH 2 NH 3 )((+)-C 4 H 4 O 6 ) (EDT) crystals, namely many-phonons SRS and efficient cascaded χ (3) ↔ χ (2) generation including SHG processes under phase matching conditions of type I and type II. All recorded multiple Stokes and anti-Stokes lasing wavelengths were attributed to the eight χ (3) -active vibration modes (≈ 80, ≈ 100, ≈ 470, ≈ 785, ≈ 990, ≈ 2945, ≈ 2975, and ≈ 3010 cm -1 ) of the crystal. The first Stokes steady state Raman gain coefficients in the visible were estimated. Carried out measurements of refractive indices show that EDT is phase-matchable for SHG in its whole optical transmission range. Short review of SRS-promoting modes of all known χ (3) -active organic crystals are given as well. a1 a3 a2 O C H H N View of a stick-and-ball representation of the crystal structure of ethylenediamine (+)-tartrate approximately along the a 3 -axis