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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper JSIII2_5

Direct Carrier-Envelope Phase Control for Coherent Synthesis with a Dual-Color Femtosecond Optical Parametric Oscillator

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Abstract

Coherent synthesis offers a route to sub-femtosecond laser pulses but generally requires a spectral bandwidth wider than the emission from a single laser. A direct way to realize this is to combine outputs from several independent lasers coherently by controlling their relative phases and pulse repetition frequencies [1]. Using outputs from a synchronously pumped ultrafast optical parametric oscillator for coherent synthesis passively ensures that the pulses have perfectly matched repetition frequencies, relaxing the technical constraints on achieving coherent synthesis. In our previous work [2], we reported a dual-color femtosecond OPO in which the co-resonant signal pulses had different carrier-envelope phase-slip (CEPS) frequencies (F1 at the shorter wavelength, F2 at the longer wavelength) and the interference between the pulses generated an easily detectable internal beat frequency Fint=\F1-F2\ despite their center wavelengths being separated by ~l00nm. Shifting the frequency of one of the two pulses by their mutual CEPS frequency difference, which is equal to the internal beat frequency, is sufficient to create two pulses with identical CEPS frequencies which can be combined to create a single coherently synthesized waveform. Because the internal beat frequency is generated in the OPO cavity simultaneously when it is operating in dual-color mode, no additional spectral broadening or nonlinear interferometer is needed to obtain the CEPS difference frequency, so greatly simplifying the experiment.

© 2007 IEEE

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