Raman and Coherent Raman Symmetry Specific Low-Frequency Vibrational Spectra ofLiNbO3 Single Crystals*

We have measured polarization sensitive Raman and Coherent Raman Spectra [1] of

Stochiometric Lithium Niobate (LiNbO3) crystals.  The observed emission bands are related to

the symmetry species of the crystal. We explain the measurement and the signal processing

methods used to eliminate unwanted spectral response properties of the laser spectroscopy

system. These include birefringent and nonresonant background effects. We concluded that the

coherent method can significantly reduce the measurement time even if it is executed in the low

power density range relative to the spontaneous Raman recordings condition and provide much

richer information about the vibrational structure of the crystal.

[1] Vibrational Spectroscopy 108 (2020) 103056