Potassium Titanium Oxide Phosphate (KTP) Optical 'Parametric Oscillator Pumped at 0.532 and 1.064μm

Optical paranetic oscillators (OPO) are attractive sources of coherent radiation in application for which laser sources are unavailable or for which wide tunability is needed. For samples, they can be used as mid-IR. countermeasure sources in military applications and can be applied into difference absorption lidar operating in the range of 2 ~ 14 μ m to monitor environment, medical diagnosis and treatment, material processing, scientific instrument, optical communication, low-light imaging, atmospheric aberration for astronomy and satellite tracing, optical signals processing, communication and imaging in water, remote sensing and identification biological materials. Many nonlinear frequency-conversion crystals such as lib3O5(LBO), KTiOPO4(KTP), β-BaB2O4 have been used in OPO devices. KTP is one of the best nonlinear frequency-conversion crystals, and it has high nonlinear coefficient, high damage threshold, easily-polished surface, and a broad transparency range[1,2]. So, Here, we focus our interest to KTP OPO.