A new scheme for stabilizing the carrier-envelope (CE) phase of a few-cycle laser pulse train is demonstrated. Self-phase modulation and difference-frequency generation in a single periodically poled lithium niobate crystal that transmits the main laser beam allows CE phase locking directly in the usable output. The monolithic scheme obviates the need for splitting off a fraction of the laser output for CE phase control, coupling into microstructured fiber, and separation and recombination of spectral components. As a consequence, the output yields 6-fs, 800-nm pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform.
© 2005 Optical Society of America
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(320.7160) Ultrafast optics : Ultrafast technology
Takao Fuji, Jens Rauschenberger, Alexander Apolonski, Vladislav S. Yakovlev, Gabriel Tempea, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Walter Lehnert, Michael Scherer, and Ferenc Krausz, "Monolithic carrier-envelope phase-stabilization scheme," Opt. Lett. 30, 332-334 (2005)