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We demonstrate the highest efficiency ($\sim$80%) second harmonic generation(SHG) of Joule level, 27 femtosecond, high contrast pulses in a type-I lithiumtriborate (LBO) crystal. In comparison, potassium dihydrogen phosphate (KDP)gives a maximum efficiency of 26%. LBO thus offers high intensity ($>$10$^{19}$W/cm$^{2}$), ultra-high contrast femtosecond pulses, which have great potentialfor high energy density science particularly with nanostructured targets aswell as technological applications.

Efficient second-harmonic generation of a high-energy, femtosecond laser pulse in a lithium triborate (LBO) crystal