ABSTRACT
ABSTRACT: Considering that the large pulse energy of the fundamental frequency laser in the intracavity pumped Optical Parametric Oscillator (OPO) can cause damage of the optical components, a new method of making the fundamental frequency laser backward output is adopted, which reduces the power density in the laser cavity. We describe a KTPOPO which transmitting backward fundamental frequency light and outputting 1.57 μm laser. The 1.57 μm laser energy is reduced while increasing the transmittance of backward fundamental frequency laser. When the transmittance of backward fundamental frequency is 20%, 52 mJ 1.57 μm output energy is obtained. We have concluded the relation between the transmittance of backward fundamental frequency beam and the output energy. The relation between the energy of pumped light and efficiency of OPO is obtained.
