We use a TiSa oscillator amplifier system running at 745nm (2mJ, 120fs). The TiSa pulses are frequency tripled in BBO (type I SHG followed by type I SFM) to 248.5nm. The reason for the kind of exotic wavelength is that we amplify the 100µJ pulses to >10mJ in an excimer discharge afterwards. Unfortunately, the spectral bandwidth of the THG from the TiSa is narrow than the gain spectrum of the KrF excimer. I think the reason is the limited acceptance bandwidth of the THG crystal (maybe also the SHG crystal). So I was wondering if there is a straight forward possibility to get a broader spectrum out of the THG, e.g. by using a thinner BBO or just a different material for triplling. A similar pulse energy at 248nm would be desireable to have sufficient seed for amplification.
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