Stimulated Raman Scattering in Melilite‐Type Crystals Ca2MgSi2O7 and Ca2Ga2SiO7. Issue 8 (14th June 2020)

• Record Type: Journal Article
• Authors: Kaminskii, Alexander A.; Bohatý, Ladislav; Eichler, Hans Joachim; Lux, Oliver; Rhee, Hanjo; Burianek, Manfred; Becker, Petra
• Is Part Of: Crystal research and technology. Volume 55:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-14
• Subjects: Ca2Ga2SiO7 -- Ca2MgSi2O7 -- many‐phonon χ(3)‐nonlinear lasing -- stimulated Raman scattering (SRS) -- tetragonal melilite‐type crystals; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.202000038
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract: χ (3) ‐nonlinear optical interactions in two melilite‐type stimulated Raman scattering (SRS)‐active non‐centrosymmetric crystals, Ca2 MgSi2 O7 and Ca2 Ga2 SiO7, 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 Ca2 MgSi2 O7, and ω SRS1 ≈ 720 cm −1 and ω SRS2 ≈ 550 cm −1 for Ca2 Ga2 SiO7, respectively, combined phonon modes are observed. For Ca2 MgSi2 O7 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). Abstract : Searching for new crystals with potential for realization of self‐frequency Raman laser converters χ (3) ‐nonlinear lasing properties of the melilite‐type laser host crystals Ca2 MgSi2 O7 and Ca2 Ga2 SiO7 are investigated. Based on two active vibration modes and two combined modes for each crystal effective frequency conversion via stimulated Raman scattering and Raman‐induced four wave mixing is observed.