Tuning range limitation in lithium niobate OPO synchronously pumped at 532 nm

摘要

Tuning range limitation in the temperature-tuned 90 degrees lithium niobate OPO synchronously pumped at 532 nm by long trains of 30 ps pulses is investigated. It is shown that the threshold intensity for oscillation at a signal wavelength shorter than 710 nm quickly rises. The main reason for this is two-photon absorption of the picosecond pump pulses, which increases at higher lithium niobate temperatures and so really limits the tuning range of this OPO.