Spectral dispersion, phase, and relaxation of

The value of has first been evaluated by Schmid [123], by fitting a polynomial to the measured curve of signal intensity versus pump laser intensity. At 748 nm, this fit yields a 

With the improved modulation method, a value of (1.69 0.79) x 10 (mW) (1.1 X 10 esu) was evaluated at 729 nm [106]. This is in reasonable agreement with Schmid s measurements, considering the different wavelengths, different measurement techniques, and different samples. 

After successful growth of thin (a few micrometers) p-TS6 crystals, it was possible to study signals at near-resonant wavelengths without an interfering thermo-optical effect 

In the near resonant regime, the relaxation shows the same behaviour as No energy relaxation can be resolved in the off-resonant regime around ca. 720 nm, but the relaxation time increases with shorter wavelengths (Fig. 9.54). 

Flowever, with even larger wavelengths, the relaxation times rise again (e. g. 2.3 ps at 748 nm) [120], This can be successfully described proposing a three level energy scheme 

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