Gorelik V S, Tcherniega N V, Schevchenko M A, Skrabatun A V, Bi Dongxue, Baranov A N, Kudryavtseva A D, Maresev A N
P.N. Lebedev Physical Institute, Russian Academy of Sciences, 53, Leninskiy Prospekt, Moscow, Russia; Bauman Moscow State Technical University, ul. Baumanskaya 2-ya, 5, Moscow, Russia.
P.N. Lebedev Physical Institute, Russian Academy of Sciences, 53, Leninskiy Prospekt, Moscow, Russia.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Aug 15;237:118418. doi: 10.1016/j.saa.2020.118418. Epub 2020 Apr 27.
The spectra of stimulated Raman scattering of light in ethanol and in water suspensions containing diamond microparticles with sizes 0.2-0.3 μm were investigated. An excitation radiation source was a pulsed ruby laser with a generation wavelength λ = 694.3 nm, a pulse duration τ ≈ 20 ns, a maximum beam energy of E = 0.6 J, a spectral width Δν = 0.015 cm, and a beam divergence 3.5·10 rad. For the first time, the observation of stimulated Raman scattering of light at a boson peak in suspension of diamonds microcrystals with close sizes (0.2-0.3 μm) in a liquid is reported. The corresponding spectra were recorded using a Fabry-Perot interferometer. In this case, the frequency shift of the stimulated Stokes Raman scattering depended on the size of the diamond microparticles introduced into the liquid and amounted to ~1 cm. In addition, stimulated Raman scattering by a fundamental optical mode with a frequency shift ν = 1331 cm was observed. In this case, the Raman spectra were recorded using a small-sized spectrometer with a multi-element receiver, detecting radiation in the range of 200-1000 nm. At a sufficiently high intensity of the exciting radiation, the Stokes and anti-Stokes satellites were simultaneously present in the spectrum of stimulated Raman scattering. The obtained results on stimulated scattering of diamond microparticles in liquids are of interest for estimating the sizes of microcrystals from scattering spectra at a boson peak, as well as for creating a frequency comb of emitters based on stimulated Raman scattering with a large frequency shift.
研究了乙醇以及含有尺寸为0.2 - 0.3微米金刚石微粒的水悬浮液中光的受激拉曼散射光谱。激发辐射源是一台脉冲红宝石激光器，其产生波长λ = 694.3纳米，脉冲持续时间τ≈20纳秒，最大光束能量E = 0.6焦耳，光谱宽度Δν = 0.015厘米，光束发散角为3.5·10弧度。首次报道了在尺寸相近（0.2 - 0.3微米）的金刚石微晶悬浮液中，在玻色子峰处观察到光的受激拉曼散射。使用法布里 - 珀罗干涉仪记录了相应的光谱。在这种情况下，受激斯托克斯拉曼散射的频移取决于引入液体中的金刚石微粒的尺寸，约为1厘米。此外，还观察到了频率偏移ν = 1331厘米的基模光学受激拉曼散射。在这种情况下，使用带有多元素接收器的小型光谱仪记录拉曼光谱，检测200 - 1000纳米范围内的辐射。在足够高的激发辐射强度下，受激拉曼散射光谱中同时出现了斯托克斯和反斯托克斯卫星峰。关于金刚石微粒在液体中的受激散射所获得的结果，对于从玻色子峰处的散射光谱估计微晶尺寸以及基于具有大频移的受激拉曼散射创建发射体频率梳具有重要意义。
