Pulse propagation and shaping are investigated in photorefractive self-pumped phase conjugators in both transmissionand reflection-grating regimes. The dispersion properties of self-pumped phase conjugators are analyzed by taking into account both the grating dispersion and the angular dispersion. The complex transfer functions are obtained by treating the crystal as a linear dispersive medium. We show that the pulse width as a result of the self-pumped phase conjugation is much wider in the reflection regime than in the transmission regime. The experimental results are consistent with the results calculated for the transmission-grating regime, indicating that this type grating is the dominant mechanism in the case of a femtosecond self-pumped phase conjugator. © 2000 Optical Society of America [S0740-3224(00)00908-5] OCIS codes: 190.5040, 190.5330, 190.5530, 320.5520.
4 Figures and Tables
Fig. 4. Broadening factor of the SPPC from the TG-SPPCM at 450 nm versus the grating period. Solid, dashed, and dotted curves represent the chirp parameter C 5 0,21, 1, respectively. The SPPC’s broaden for the three cases.
Fig. 6. Broadening factor of the SPPC from the 2k-grating versus the wavelength for three chirp parameters. The period of the 2k grating relates to the wavelength as L 5 l/2n0 .
Fig. 8. Pulse shapes of SPPC from 2k-grating-based SPPCM. Solid, dashed, and dotted curves represent the pump pulse, SPPC at 800 nm, and SPPC at 450 nm, respectively.
Fig. 9. Zero-dispersion angle versus wavelength. Solid and dashed curves represent the transmission grating and the reflection grating, respectively.
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