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Retracing behaviors of phase-matching angle in optical parametric oscillators
were studied theoretically. They implied that two or more sets of signal-idler
outputs could be observed at certain phase-matching angles. In other words,
four-wavelength or more optical parametric oscillators could be implemented in
a nonlinear crystal which showed the retracing behavior. Previous research
indicated that a nonlinear crystal showed the retracing behavior only when the
pumping wavelength was in a specific wavelength range which was not available.
In this thesis, we proposed that in a noncollinear phase-
matching configuration,
retracing behaviors of phase-matching angle could be observed with the pumping
wavelength easily accessed. Particularly, our numerical results showed that
four-wavelength optical parametric oscillators could be implemented in a
BBO with the pumping wavelength at 266, 355, 532, and 1064 nm, which correspond
to the fourth, third, second harmonic of a Nd:YAG laser and itself. Meanwhile,
it was observed that over a quite broad signal wavelength range,the phase-
matching condition could be simultaneously reached, leading to an optical
parametric oscillator of broad-bandwidth signal and idler. This theoretical
prediction was already proved in our lab. Optical parametric oscillators of
broad-bandwidth were also studied in details.
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