Report

Phase-Coherent Optical Pulse Synthesis from Separate Femtosecond Lasers

Science  17 Aug 2001:
Vol. 293, Issue 5533, pp. 1286-1289
DOI: 10.1126/science.1061754

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Abstract

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.

  • * These authors contributed equally to this work.

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

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

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