研究目的
Investigating the fine spectral features within several Raman active vibrational modes in potassium titanyl phosphate (KTP) crystal using femtosecond time-domain coherent anti-Stokes Raman scattering spectroscopy.
研究成果
Demonstrated resolution of complex Raman active vibrations in KTP crystal, revealing several spectral components corresponding to vibrations of different symmetries with distinctly different damping rates. The results can be used to estimate stimulated Raman gain for different vibrational modes in the crystal.
研究不足
The complexity of KTP’s vibrational spectra makes it difficult to perform comprehensive and unambiguous phonon line assignment. The experimental setup's sensitivity and resolution, while high, may not capture all spectral details due to the crystal's multiatomic unit cell.
1：Experimental Design and Method Selection:
Employed a femtosecond time-domain coherent anti-Stokes Raman scattering spectroscopy technique with three-color CARS geometry using widely tunable 110-150 fs pulses.
2：Sample Selection and Data Sources:
Used a flux-grown KTP crystal cut at φ=40? and θ=90?.
3：0?.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Optical parametric oscillators (OPOs), Ti:sapphire oscillator, high numerical aperture objective lens, diffraction grating, bandpass filters, photomultiplier tube (PMT).
4：Experimental Procedures and Operational Workflow:
Coherently drove lattice vibrations with energies within 600-990 cm?1 using OPOs, probed with a delayed part of the Ti:sapphire oscillator, detected anti-Stokes signal photons at selected wavelengths.
5：Data Analysis Methods:
Retrieved the vibrational system’s response function and Raman spectra by solving Fredholm type-I equations using the Fourier transform method.
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