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Chemical Physics

Coherent control of second harmonic generation using spectrally phase coded femtosecond waveforms

Zheng Zheng, Andrew M. Weiner

Published Jun 1, 2001• 35 citations
Publisher
DOI
10.1016/s0301-0104(01)00220-8

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This Week in Science

Mixing light waves of different frequencies is a routine technique for synthesizing waveforms of arbitrary shape and spectral composition. For applications in coherent quantum control, ultrafast optical pulses over a range of wavelengths may be required. Shelton et al. (p. 1286; see the Perspective by Brown et al. ), building on recent advances involving phase-locking of femtosecond optical pulses, generation of a comb of optical frequencies, and precision measurement of optical frequencies, now show that two waveforms can be coherently stitched together from separate femtosecond lasers to form a coherent pulse train.

Science•Aug 17, 2001•0 citations
We demonstrate a novel all-optical scheme for measuring the correlation of spectrally phase-coded ultrashort optical waveforms that uses second-harmonic generation (SHG) in long, periodically poled lithium niobate crystals. The SHG yield can be controlled over a range of ~30 dB, depending on the correlation of the applied phase codes. Such a spectral phase correlator has applications for ultrashort-pulse optical code-division multiple-access networking and could serve as a nonlinear optical but classical analog for certain schemes for coherent quantum control of multiphoton processes.
Mixing light waves of different frequencies is a routine technique for synthesizing waveforms of arbitrary shape and spectral composition. For applications in coherent quantum control, ultrafast optical pulses over a range of wavelengths may be required. Shelton et al. (p. 1286; see the Perspective by Brown et al. ), building on recent advances involving phase-locking of femtosecond optical pulses, generation of a comb of optical frequencies, and precision measurement of optical frequencies, now show that two waveforms can be coherently stitched together from separate femtosecond lasers to form a coherent pulse train.