Stimulated low-frequency Raman scattering (SLFRS) can provide important information on elastic properties of different nanoparticle systems, in particular, biological nanostructures. In the present study, for the first time we investigate low-frequency vibrational modes in human and bovine serum albumin (HSA and BSA), in view of the SLFRS method. We use 20 ns ruby-laser pulses for excitation. The SLFRS frequency shifts, corresponding to acoustic eigenfrequencies of the sample, are registered by Fabry–Pérot interferometers. For HAS, the set of eigenfrequencies obtained is 6 GHz (0.2 cm−1), 10 GHz (0.33 cm−1), and 15.6 GHz (0.52 cm−1), while for BSA, it is 8.7 GHz (0.29 cm−1) and 16.5 GHz (0.55 cm−1). We also measure the conversion efficiency and threshold. The SLFRS can be applied for biological-object identification and impact on the biological objects.
stimulated scattering spectrum laser human serum albumin bovine serum albumin nanoparticles nonlinear optics biharmonic pump
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