FIG. 1. Schematic diagram of a surface-emitting TPO using KNbO3 with a noncollinear phase-matching scheme.
FIG. 2. Dispersion curve for the B1-symmetry polariton modes in KNbO3 and the phase-matching curves for the 1064-nm pump laser.
FIG. 3. Dispersion curve for the B1-symmetry polariton modes in KNbO3 and the phase-matching curves, at room temperature and a fixed phase-matching angle θ of 1°.
FIG. 4. Effective parametric gain length versus pump wavelength, assuming the physical length of the resonant cavity is 80 mm, l is 60 mm, and wp is 1 mm.
FIG. 5. Effective parametric gain length versus the radius of the pump wave, assuming the physical length of the resonant cavity is 80 mm, l is 60 mm, and p λ is 1064 nm.
FIG. 6. Effective parametric gain length versus crystal length, assuming the physical length of the resonant cavity is 80 mm, wp is 1 mm, and p λ is 1064 nm.
FIG. 7. THz-wave parametric gain coefficient gT and absorption coefficient T α for KNbO3 and MgO:LiNbO3 at room temperature( p λ = 633 nm, Ip = 100 MW/cm2): (a) gain coefficient gT, (b) absorption coefficient Tα .
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