A laser system which features a distributed Bragg reflector (DBR) or a distributed feedback (DFB) tunable laser (11) coupled to a quasi-phasematched (QPM) waveguide (31; 16) of nonlinear material (13). The DBR laser is tuned either thermally (14; 51, 53) or via current injection (Itune), or both, converting the output of a red laser into blue. Thermal tuning provides coarse adjustment while injection current tuning provides fine adjustment. Intensity modulation or pulsed output may be provided by application of a modulation signal (Imod) to the DBR laser. Another embodiment provides frequency modulation (Vfsk) of the laser. In yet another embodiment, a high power laser (103) pumped fiber amplifier (101) is disposed between the laser (11) and the waveguide (16).