An intra-extra (hybrid) cavity Optical Parametric Oscillator (OPO) using monolithic KTP crystal has been built for
converting 1064nm Nd:YAG laser radiation into 1572nm eye safe wavelength with high total conversion efficiency.
Here a monolithic X-cut KTP crystal, having HR coating for 1064nm on the output face, was used external to the
Nd:YAG laser. The Nd:YAG laser is Q-switched by a rotating prism. Because of the prism in rotation, it comes in
alignment with the PR (partial reflective) mirror of Nd:YAG laser and with the output face of the KTP crystal. This
situation gives rise to the intra-extra cavity OPO. In this configuration OPO gives sufficient eye safe output even when
Nd:YAG is operated below its lasing threshold. Also the power of the OPO eye safe output is reasonably insensitive to
the alignment variations.
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