Blue 403 nm laser light is generated by frequency doubling the radiation of an AlGaAs diode laser oscillator amplifier system in critically phase matched LiB3O5 (LBO) and β-BaB2O4 (BBO) crystals. The laser system emits 400 mW of single frequency 806 nm radiation in an almost diffraction limited beam. For optimum doubling efficiency the laser radiation is enhanced by a resonant external ring cavity. The nonlinear crystal is placed at a resonator internal focus. Using a 16-mm-long LBO crystal a diode laser power of 387 mW generated 98 mW of second harmonic radiation, corresponding to a conversion efficiency of 25%. The same power was obtained in a 12- mm-long BBO crystal with a laser power of 417 mW. The measured conversion efficiencies are in good agreement with the values calculated for critically phase matched conversion in these nonlinear materials.

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Frequency-stable operation of a diode-pumped continuous-wave optical parametric oscillator (OPO) of RbTiOAsO(4) is demonstrated. Piezoelectric and fast electro-optic control of the optical length of the two-mirror OPO cavity (resonant for the pump and the idler waves) compensates for thermal changes in the refractive index of the OPO crystal (induced by absorption of pump light) and acoustic perturbations of the cavity length. Pumped by 405mW of the 810-nm output of a GaAlAs masterf-oscillator-tapered-amplifier diode laser system, the OPO generates a power-stable single-frequency signal wave at 1.24microm with an output of 84mW and a spectral bandwidth of less than 10MHz.

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