Abstract
We report a double feedback loop for the improvement of the carrier-envelope phase stabilization of a chirped mirror based femtosecond laser oscillator. By combining the control of the Ti:sapphire crystal temperature and the modulation of the pump power, the carrier envelope offset frequency, , was locked for close to 20 h, which is much longer than the typical phase stabilization time with only pump power modulation.
© 2009 Optical Society of America
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