Noncollinear-pumped KTP optical parametric oscillator
1999
A theoretical analysis and an experimental study are presented on
the phase-matching condition of noncollinearly pumped optical
parametric oscillators (OPO’s) based on a noncritical
phase-matching potassium titanyl phosphate (KTP) OPO. It is
shown that noncollinearly pumped, double-pass, singly resonant optical
parametric oscillators maintain the advantage of round-trip parametric
gain in a collinear pump, since in this case the two generated signal
waves are coherent, which results in high conversion efficiency and low
pump threshold. With this KTP OPO we achieved 31% energy
conversion efficiency from a 1064-nm pump wave to 1572-nm eye-safe
output. In addition, because the incident pump beam is not
perpendicular to the OPO cavity mirrors and consequently no reflected
beam flows back into the pump source, we can avoid employing optical
isolators.
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