Stimulated Raman Scattering in Melilite‐Type Crystals Ca 2 MgSi 2 O 7 and Ca 2 Ga 2 SiO 7

• Published in: Crystal research and technology (1979) Vol. 55; no. 8
• Main Authors: Kaminskii, Alexander A., Bohatý, Ladislav, Eichler, Hans Joachim, Lux, Oliver, Rhee, Hanjo, Burianek, Manfred, Becker, Petra
• Format: Journal Article
• Language: English
• Published: 01.08.2020
• ISSN: 0232-1300; 1521-4079
• DOI: 10.1002/crat.202000038

Abstract χ (3) ‐nonlinear optical interactions in two melilite‐type stimulated Raman scattering (SRS)‐active non‐centrosymmetric crystals, Ca 2 MgSi 2 O 7 and Ca 2 Ga 2 SiO 7 , formerly known as Nd 3+ ‐laser media, are presented. Under picosecond pumping at 1.064 and 0.532 µm cascaded and cross‐cascaded effects occur in these tetragonal silicates. Besides the SRS‐promoting phonon modes with energy of ω SRS1 ≈ 908 cm −1 and ω SRS2 ≈ 668 cm −1 for Ca 2 MgSi 2 O 7 , and ω SRS1 ≈ 720 cm −1 and ω SRS2 ≈ 550 cm −1 for Ca 2 Ga 2 SiO 7 , respectively, combined phonon modes are observed. For Ca 2 MgSi 2 O 7 new data in a broad wavelength range of refractive indices and their dispersion are given as well. The observed χ (3) ‐nonlinear properties expand the functionality of the studied silicates and foreshadow their use in self‐frequency Raman laser converters (self‐SRS lasers).