We investigated the output efficiency of signal wave as a function of reflectance of output coupler in nanosecond optical
parametric oscillators. The measurements are performed for a type-I critically phase matched signal-resonant optical
parametric oscillator of Beta-Barium-Borate crystal. It is observed that the threshold fluence and slope efficiency
increases as the reflectance of output coupler decreases, resulting that the maximum efficiency of the signal output was
achieved with ~ 60% reflectance of output coupler. It is found that the experimental result of output characteristics is in
good agreement with the numerical prediction by a simple numerical model.
The polyisocyanate random copolymer containing an asymmetric chiral carbon center and Disperse-Red-1 nonlinear optical chromophores is synthesized. The optical activity is measured at the visible and near infrared spectral ranges, confirming the existence of the induced optical chirality in the copolymer film. Upon the application of a Corona field to the slab waveguide copolymer film, the polarization rotation at the wavelength of 1.3 micrometers is found to be changed, opening the possibility of the chiral electro-optic modulation in a chiral polymeric waveguide thin film.
The Pockels coefficient of the chiral nonlinear optical crystal was measured in a longitudinal electro-optic configuration. The presence of the optical activity (the linear optical property) in a chiral system facilitates the measurement of the Pockels coefficients (related to the second order nonlinear optical property) with a low modulation voltage, important in the practical applications.
A Mach-Zehnder interferometry is employed to measure the Pockels coefficients in a poled polymer thin film in both the coplanar and the parallel-plate electrode structures. The modulated intensity ofthe Mach-Zehnder interferometer is investigated as a function of the optical bias in the reference arm, the modulation voltage applied to the film, the polarization angle of the incident light, and the angle of incidence on the film, as a complete analysis of the
optical characterization of an electro-optic polymer film. The Mach-Zehnder interferometry measurement of the Pockels coefficients has an advantage over the single-beam polarization interferometry in permitting the independent determination of the Pockels tensor components, r13 and r33.
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