B. Voigt et al., A new set-up for nonlinear polarization spectroscopy in the frequency domain: Experimental examples and theoretical background, MEAS SCI T, 10(1), 1999, pp. N7-N11
The advantages of a new experimental geometry for nonlinear polarization sp
ectroscopy in the frequency domain (NLPF) are demonstrated. First, homogene
ous illumination of the sample allows one to use lower pump intensities, so
that the chi((3)) approach to describing the NLPF signal is valid. Secondl
y, there being fewer artefacts from competitive scattering processes result
s in distortionless NLPF spectra. These experimental improvements are illus
trated by experimental results concerning pinacyanol.