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Experimental setup. L1 and L2 are plano-convex and plano-concave lenses, respectively. BBO is a nonlinear crystal(, type I) and L3 and L4 are focusing lenses mounted on XYZ translation stages. An iris (ID) is used to adjust coupling efficiency of pump beam. is a half-wave plate. W1, W2 are -thick windows. L5 is a collimating lens and DM a dichroic mirror. PS is a 90° periscope system.
(Top) DUV output tuning curve (thick line; bottom and left hand axes) where pulses are obtained by mixing either OPA idler (●) or signal (▴) pulses as seed for the fiber. (◻) Corresponding OPA pulse energies (thin line; right and top axes) measured at the entrance to fiber. (Bottom) Generated pulse spectra with fiber seeded by tunable IR pulses. Spectral broadening is (FWHM) corresponding to transform-limited pulse durations .
(a) Output spectra of light generated by FWM in a hollow core fiber (thick line) and by SFM in an thick BBO crystal (thin line, ). Fiber parameters: length, diameter. Pulsewidths in parentheses are transform-limited pulse durations corresponding to indicated spectral bandwidths (assumed Gaussian). (b) Spectrum of UV pulse centered at generated by FWM. Experimental autocorrelation (points) of (c) and (d) pulses after prism compression; (solid curve) fit assuming Gaussian pulse shape.
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