Spontaneous and stimulated Raman scattering by the products of the interaction of lithium deuteride with the environment

• Published in: Optical materials 2023-08, Vol.142, p.114082, Article 114082
• Main Authors: Skrabatun, Alexander V., Pyatyshev, Alexander Yu, Vodchits, Alexander I., Khodasevich, Inna A., Korozhan, Olga P., Orlovich, Valentin A.
• Format: Article
• Language: English
• Subjects: Breathing mode; Disordered media; Lithium deuteride; Lithium hydroxide; Raman scattering
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2023.114082

The processes of spontaneous and multicomponent stimulated Raman scattering (SRS) in a polycrystal consisting of the products of the interaction of lithium deuteride crystals with air molecules are studied. The interaction of lithium deuteride with environmental molecules resulted in a solid polycrystalline mixture of LiOH, LiOD, LiOH·H2O, and Li2CO3 on the crystal surface. Excitation of the sample under study by the third harmonic of a picosecond repetitively pulsed YAG:Nd3+ laser made it possible to detect three Stokes and the second anti-Stokes SRS components with a Raman frequency ν = 3660 cm−1 corresponding to the valence breathing mode of the OH− ion. A feature of the obtained spectra is the smaller spectral half-width of the second and third Stokes components compared to the first. When the studied polycrystals were excited by picosecond radiation with a wavelength λ = 532 nm, two Stokes and one anti-Stokes SRS components corresponding to the internal symmetric vibrational mode of LiOH were detected. The excitation of SRS at the Raman frequency of the OH− vibration ν = 3660 cm−1 in solids is promising due to the high-frequency shift and high quality factor, and is also important for studying the strength of hydrogen bonds. •The surface of LiD, when interacting with air, contained crystals of LiOH, LiOD, Li2CO3.•An uneven distribution of the amount of LiOH and LiOD formed from LiD was found.•Similar SRS thresholds were observed for the first and second Stokes components of LiOH.•Up to 8 SRS of LiOH components were registered under repetitively pulsed excitation.