17 February 2010 Fiber-based drive laser systems for the Cornell ERL electron photoinjector
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Cornell University is developing a high brightness, high average current electron source for the injector of an Energy Recovery Linac (ERL) based synchrotron radiation source. Master oscillator-power amplifier (MOPA) laser systems have been developed to satisfy the requirements of the Cornell ERL high brightness electron photoinjector. One system operates at 50-MHz and low average power, and the second system operates at 1.3 GHz and high average power. The GHz system is comprised of a commercial harmonically mode-locked Yb-fiber oscillator, a SMF pre-amplifier, and a double-clad, large-mode area Yb-doped fiber amplifier. Currently, the system provides 45 watts infrared power in a train of 3-ps-long pulses at 1.3 GHz in a near diffraction-limited beam. A BBO Pockels cell is used to generate macropulse trains at various repetition rates. The infrared pulses are frequency-doubled to produce green beam average power of 15 watts. The green pulses (Gaussian shape, FWHM 2.5 ps) are efficiently shaped to flat-top pulses with sharp rise and fall times through differential delay in a set of birefringent crystals (YVO4). The transverse shaping is implemented with commercial refractive beam shaper (Newport). The laser systems design and characterization will be presented. Future work will address achieving of even larger average powers.
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Dimitre Ouzounov, Dimitre Ouzounov, Heng Li, Heng Li, Bruce Dunham, Bruce Dunham, Frank Wise, Frank Wise, } "Fiber-based drive laser systems for the Cornell ERL electron photoinjector", Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 75810N (17 February 2010); doi: 10.1117/12.841376; https://doi.org/10.1117/12.841376

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