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Science 17 August 2001:
Vol. 293. no. 5533, pp. 1286 - 1289
DOI: 10.1126/science.1061754
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Reports

Phase-Coherent Optical Pulse Synthesis from Separate Femtosecond Lasers

Robert K. Shelton,* Long-Sheng Ma,*dagger Henry C. Kapteyn, Margaret M. Murnane, John L. Hall, Jun Ye*ddagger

We generated a coherently synthesized optical pulse from two independent mode-locked femtosecond lasers, providing a route to extend the coherent bandwidth available for ultrafast science. The two separate lasers (one centered at 760 nanometers wavelength, the other at 810 nanometers) are tightly synchronized and phase-locked. Coherence between the two lasers is demonstrated via spectral interferometry and second-order field cross-correlation. Measurements reveal a coherently synthesized pulse that has a temporally narrower second-order autocorrelation width and that exhibits a larger amplitude than the individual laser outputs. This work represents a new and flexible approach to the synthesis of coherent light.

JILA (formerly Joint Institute for Laboratory Astrophysics), National Institute of Standards and Technology (NIST) and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.
*   These authors contributed equally to this work.

dagger    Permanent address: Physics Department, East China Normal University, Shanghai, China.

ddagger    To whom correspondence should be addressed. E-mail: ye{at}jila.colorado.edu

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