Four-wave mixing in nanosecond pulsed fiber amplifiers

Four-wave mixing in microstructure fiber.

We report what we believe to be the first experimental demonstration of nondegenerate four-wave mixing in a microstructure fiber. The effect of the chi((3)) nonlinearity is enhanced in such a fiber because of the small core area, and we achieve phase matching by operating near the zero-dispersion wavelength (?750 nm) . We have observed parametric gains of more than 13 dB in 6.1-m-long fiber wit...

Vector theory of four-wave mixing: polarization effects in fiber-optic parametric amplifiers

We present a vector theory of four-wave mixing and use it to study the polarization-dependent nature of fourwave mixing and the conditions under which the gain of a dual-pump fiber-optic parametric amplifier becomes polarization independent. We find that in the absence of selfand cross-phase modulations, any pair of orthogonally polarized pumps can provide polarization-independent gain, but thi...

Piezoelectric contributions to pulsed degenerate four-wave mixing

In solid-state materials lacking a center of symmetry, cascaded second-order nonlinear optical effects, especially the combination of optical rectification and the linear electro-optic effect, are an important contribution to degenerate four-wave mixing ~DFWM!, an experimental tool widely used to measure the third-order nonlinear optical susceptibility. This quantity determines the magnitude of...

Ultraviolet four-wave mixing in the LP(02) fiber mode.

We report UV four-wave mixing in the LP(02) mode of a photonic crystal fiber when pumped by a frequency-doubled 532 nm microchip laser in the normal dispersion regime. A pure LP(02) mode was generated for the pump light by a broadband all-fiber mode converter. Ultraviolet signal wavelengths as short as 342 nm were generated.

Highly nondegenerate femtosecond four-wave mixing in tapered microstructure fiber