Abstract

We generate linearly polarized, 287W average-power, 5.5ps pulses using a cryogenically cooled Yb:YAG amplifier at a repetition rate of 78MHz. An optical-to-optical efficiency of 41% is obtained at 700W pump power. A 6W, 0.4nm bandwidth picosecond seed source at 1029nm wavelength is constructed using a chirped-pulse fiber amplification chain based on chirped volume Bragg gratings. The combination of a fiber amplifier system and a cryogenically cooled Yb:YAG amplifier results in good spatial beam quality at large average power. Low nonlinear phase accumulation as small as 5.1×103rad in the bulk Yb:YAG amplifier supports power scalability to a >10kW level without being affected by self-phase modulation. This amplification system is well suited for pumping high-power high-repetition-rate optical parametric chirped-pulse amplifiers.

© 2008 Optical Society of America

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