A harmonic generator laser system which features a distributed Bragg reflector (DBR) or distributed feedback (DFB) tunable diode laser coupled to a quasi-phasematched (QPM) waveguide of optically nonlinear material. Tuning of the DBR laser may be achieved either thermally or via current injection, or...http://www.google.fr/patents/US5644584?utm_source=gb-gplus-shareBrevet US5644584 - Tunable blue laser diode
