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Generation of femtosecond laser pulses tunable from 380 nm to 465 nm via cascaded nonlinear optical mixing in a noncollinear optical parametric amplifier with a type-I phase matched BBO crystal

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We report the generation of tunable femtosecond pulses from 380nm to 465nm near the degenerate point of a 405-nm pumped type-I BBO noncollinearly phase-matched optical parametric amplifier (NOPA). The tunable UV/blue radiation is obtained from sum frequency generation (SFG) between the OPA output and the residual fundamental beam at 810-nm and cascaded second harmonic generation (SHG) of OPA. With a fixed seeding angle, the generated SFG and SHG covers from 385 nm to 465-nm. With a pumping energy of 75 µJ at 405 nm, the optical conversion efficiency from the pump to the tunable SFG is more than 5% and the efficiency of SHG of the OPA is about 2%.

©2003 Optical Society of America

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Figures (3)

Fig. 1
Fig. 1 Experimental setup of the OPA-SHG/SFG. The bright spot on the left of the parametric superfluorescence ring is the SHG component and the central spot is a pinhole to let the residual pump beam go through to avoid saturating the CCD camera. The spot between the pump of OPA and the SHG is the SFG component. The image is taken with a seeding angle of 8-degree.
Fig. 2
Fig. 2 Spectra of cascaded SFG (up-figure) and SHG (bottom-figure) of NOPA at various BBO orientations. The spectra were taken at a seeding angle of 8 degree.
Fig. 3.
Fig. 3. Theoretical calculation on the relationship of phase-matching angle of SFG and SHG as a function of wavelength of OPA indicating the coexistence of SFG and SHG near the degenerate point of OPA at 810 nm.


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