An high-efficiency optical filter composed of counter-propagating wavelength converter in ZnTe, is demonstrated. The device has a extremely narrow bandwidth 0.5 angstrom, corresponding to pump intensity 1.2MW/cm2 and length of crystal 1cm, is tunable over several nanometers in bandwidth using combination of length of device and pump intensity. The presented scheme is also a candidate of wavelength-dependant switcher.
We present a theoretical analysis of second-order nonlinear difference frequency generation (DFG) in a generalized mirrorless quasi-phase-matching (QPM) frame, aimed at a comparison of counter-propagating difference frequency generation configuration (CDFG) to other DFG schemes, in view of all-optical processing and optical amplifying applications. The evolution of propagating fields within the material have been calculated in dependence of operating parameters. The increased complexity in the evolution of amplitude and phase for fields interacting in CDFG with respect to forward- propagating DFG(FDFG) is at the basis of a dramatic increase in optical amplification under particular settings of device parameters.
We have studied the harmonic generation and the effective nonlinear-optical coefficients of the quasi-periodic optical superlattice (QPOS). It has been shown that the effective nonlinear-optical coefficients in QPOS are the extension of that in periodic optical superlattice (POS). The intensities of the harmonic generation obtained by the coupled-wave equations are in good agreement with prediction by the effective nonlinear-optical coefficients.
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