GROUP-VELOCITY-MATCHED 2ND-HARMONIC GENERATION - AN EFFICIENT SCHEME FOR FEMTOSECOND ULTRAVIOLET PULSE GENERATION IN PERIODICALLY DOMAIN-INVERTED BETA-BAB2O4

With the combined use of the group-velocity-matched and the quasi-phas e-matched frequency doubling in beta-BaB2O4, femtosecond ultraviolet p ulse generation is found to be realizable with high efficiency. Calcul ation of the group-velocity mismatch shows that at approximately 630 n m wavelength of the pump pulse the mismatch vanishes completely. Typic al design parameters such as the walk-off length, the dispersion lengt hs, and the quasi-phase-matching period are evaluated numerically arou nd the zero walk-off wavelength. Temperature tuning of the operation w avelength is investigated as well.