We have developed a silver-mirror-based multipass preamplifier for a broadband amplification in a terawatt Ti:sapphire laser. With the extremely broad bandwidth of the silver mirrors, a very broad amplified spectrum can be generated at an amplified energy of $4\mathrm{mJ}$ ; the amplified spectral width is $65\mathrm{nm}$ at half maximum and $160\mathrm{nm}$ at $-25\mathrm{dB}$ without any spectral shaping technique. Such a broad amplification can be explained well by the simulation that includes gain narrowing and gain saturation. Even after a further amplification to an energy of $600\mathrm{mJ}$ , the amplified spectrum is broad enough to support an $\sim 20\mathrm{fs}$ transform-limited pulse duration.

© 2008 Optical Society of America

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