The vibrational spectrum of a KTiOPO₄single crystal studied by Raman and infrared reflectivity spectroscopy

Femtosecond-Laser Microstructuring of Ribs on Active (Yb,Nb):RTP/RTP Planar Waveguides

“…4, the Raman spectrum for these materials is very complex: it has more than 30 peaks corresponding to , and symmetry representations [25]. We observed that all the peaks in the unablated area are also present in the ablated area, indicating that femtosecond irradiation does not induce amorphisation of (Yb,Nb):RTP, at least in the spatial resolution we used.…”

“…One of the techniques used to investigate the induced microscale modifications in the crystalline material is micro-Raman ( -Raman) measurement [25]. Micro-Raman scattering measurements were made using a micro-Raman Reinshaw Confocal InVia spectrometer equipped with a Leica 2500 confocal microscope and a CCD camera as the detector.…”

Terahertz Generation Based on Cascaded Difference Frequency Generation with Periodically-poled KTiOPO4

“…(2) shows the anti-Stokes processes where THz photons and (n+1)-order Stokes photons are consumed. The theoretical values of refractive index are calculated using a wavelength-independent Sellmeier equation for KTP in the infrared [20] and THz [19] ranges, respectively.…”

“…Compared with lithium niobate (LiNbO 3 ) and lithium tantalate (LiTaO 3 ) in THz generation based on optical parametric mixing, KTP is known to have a higher laser damage threshold. Moreover, the refractive indices of KTP in the THz range are about 20% lower than that of LiNbO 3 [18,19], providing a high figure of merit and enabling a better outcoupling of the THz radiation from the crystals. Compared with zincblende structure materials in THz generation based on DFG, such as GaAs, InP, ZnTe and GaP, KTP has a high laser damage threshold, and it is relatively inexpensive.…”

Resolving fine spectral features in lattice vibrational modes using femtosecond coherent spectroscopy

“…Even though the material has been known for more than three decades, detailed spectroscopic studies on its Raman active vibrations are relatively scarce. [10][11][12] The performed studies helped to elucidate contributions to Raman and infrared spectra from major atomic units within the primitive cell, as represented by TiO 6 octahedra and PO 4 tethrahedra. Also, important details concerning line assignments and their major characteristics were provided by the studies.…”