The Nd: Yag Laser

Nd:YAG Layout | Operations Data | Nd:YAG Statistics | Gun Hutch

Multi-Pulse Nd:YAG Laser Operation for the FEL Oscillator Experiment

For the visible FEL oscillator experiment, the linac should generate a train of electron bunches. Every electron bunch transmitted through the FEL wiggler generates photons. If the appropriate resonance and beam quality conditions are achieved, a build-up of coherent radiation is observed.

For this experiment, the YAG laser provides a square 3-s train of laser pulses, 12 ns spaced, gated from the oscillator output with a Pockels cell switch. Since the requirement of the FEL experiment is a pulse train with a flat top, stable in amplitude to within 2%, this regime of operation presents an additional challenge: how to avoid natural energy drooping in the laser train due to gain depletion caused by the large extraction of energy throughout the pulse train. The solution is to introduce an exponentially decreasing loss early in the amplification process. To accomplish this, another Pockels cell based amplitude controller [IP1]is used to adjust the Nd:YAG preamplifier output. Transmission of this controller is modulated in time with an arbitrary waveform generator. Page: 1 [IP1] Link to Amplitude Control Click here for picture

Last Modified: December 3, 2007
Please forward all questions about this site to: Vitaly Yakimenko

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