We experimentally demonstrate wavelength-preserving spectral phase conjugation for compensating chromatic dispersion and self-phase modulation in optical fibers. Our implementation is based on a temporal imaging scheme that uses time lenses realized by broadband four-wave mixing in silicon waveguides. By constructing a temporal analog of a 4-f imaging system, we compensate for pulse distortions arising from second- and third-order dispersion and self-phase modulation in optical fibers.

Spectral phase conjugation via temporal imaging

All-optical phase correction scheme for few-cycle optical pulses has been proposed. The temporal phase structure of a phase-modulated pulse is recorded as spatial index modulation in a two-photon recording medium. This scheme drastically relaxes complicacy in stretcher design for few-cycle chirped pulse amplification (CPA) systems.

All-optical temporal phase correction scheme for few-cycle optical pulses using diffractive optics.

A new scheme for pulse recording, time-reversed playback, and self-regeneration in a diffractive device was proposed. Self-pulse-regeneration in a two-photon-recorded glass tip has been demonstrated.

Femtosecond pulse recoding and self-regeneration in a two-photon gated periodic diffractive optics

Temporal phase structure of a 10-fs optical pulse has been regenerated by frequency-domain phase conjugator based on the two-photon recorded Bragg diffraction. This optically programmable diffractive device with the index modulation of Δn = 0.03 was directly written by a mode-locked laser with no cavity extension.

Frequency-domain Phase Conjugator for a Few-cycle and a Few-nJ Optical Pulses

All-optical phase-correction scheme in a 10 fs CPA system using a frequency-domain phase conjugator (FDPC) has been proposed. The cubic and quadratic phase distortions are automatically eliminated by an optically programmable pre-compensator.

Automatic compensation of higher order dispersion in chirped pulse amplification system by a nonlinear-recorded diffractive optics

Schemes to generate a frequency-domain phase-conjugate pulse by frequency mixing prechirped pulses are proposed. A femtosecond timereversed replica is generated by the temporal-frequency-converted optical parametric processes.

Frequency-domain phase-conjugate femtosecond pulse generation using frequency resolved crossphase modulation.

Summary form only given. We have demonstrated generation of a temporally reversed femtosecond pulse inside chirped pulse system. Frequency chirping in an input pulse due to unknown group velocity dispersion is converted to opposite frequency chirping by this scheme. This opposite chirped pulse, a frequency domain phase conjugation pulse, reconstructs the initial phase structure after propagating through the same dispersion medium. We can automatically compensate phase distortion of an ultrashort and/or ultrabroadband light pulse.

S. Ichihashi

Papers

Frequency-domain phase-conjugate femtosecond pulse generation using frequency resolved crossphase modulation.

Frequency-domain phase-conjugate femtosecond pulse generation using frequency resolved cross-phase modulation