High-Gain Regenerative Chirped-Pulse Amplifier Using Photonic Crystal Rod Fiber

We have demonstrated a high-gain regenerative chirped-pulse amplifier (CPA) using an Yb-doped photonic crystal rod fiber of 100 µm core diameter. The input pulse energy is 150 nJ in a pulse width of 2.5 ns at a repetition rate of 1 kHz with a central wavelength of 1053 nm. At a pump power of 13.2 W, the amplified pulse energy is 0.26 mJ, yielding a gain of 1700.