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Compression and broadening of phase conjugate pulses in photorefractive self pumped phase conjugator

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Fig. 1.(a) Transmission-grating-based self-pumped phase con-�jugator; (b) reflection-grating-based self-pumped phase conjuga-tor; (c) transmission grating; (d) reflection grating.(K1 , �1) in-dicate the incident beam; (K2 , �2) indicate the diffracted beam;1,2 are the incident and the diffracted angles.l1 and l are thethickness of grating and the distance between the crystal surfaceand the grating, respectively.� is the incident angle in air.
Figure 2(a) shows the first-order dispersion k�andTG-SPPCM is chosen as 2and 800 nm.length is fixed, the grating period changes accordingly asthe Bragg angle changes.creases, the first-order dispersion of the transmissionfor the RG-SPPCM is 21 as functions of wavelength.�, �1 , andThe Bragg angle for the�B � 45°, and the Bragg angle�B � 120°.Figure 2(b) shows �1 �1 versus the Bragg angle at two wavelengths:450Since we assume that the pump wave-We note that as the angle in-grating increases, whereas the opposite occurs for the re-
Fig. 2.(a) First-order dispersion k�, �1 , and �1 versus thewavelength.Solid, dashed, and dotted curves represent k�, �1 ,and �1 , respectively.The Bragg angles are 22.5° and 60° forthe transmission and the reflection gratings, respectively
Fig. 4.Broadening factor of the SPPC from the TG-SPPCM at450 nm versus the grating period.Solid, dashed, and dottedcurves represent the chirp parameter C � 0,�1, 1, respectively.The SPPC’s broaden for the three cases.
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