Preliminary measurements have been made with pump powers of 90 mW at 813 nm and 800mW at 1064 nm with respective coupling efficiencies of 75% and 35%. This yielded a total of 70mW of blue light that was emitted from both ends of the cavity. Therefore the power conversion efficiency of the system is 20%. The transmitted 813 nm signal obtained by scanning the cavity length is shown in figure 2. The blue generation only occurs when the cavity is doubly resonant, thus resulting in a decrease of the initial circulating power due to the conversion loss and an increase of the coupling efficiency due to the impedance matching. The structure in the doubly resonant fringe is due to the different cavity finesses for the pump wavelengths. By increasing the diode laser power one expects a significant improvement of the generated blue power since the impedance matching conditions will be more closely satisfied.
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