Strongly Modulated Pulses

Figure 4.7 (a) Schematic representation of an strongly modulated pulses (SMP), with the respective table of... 

E.M. Eortunato, M.A. Pravia, N. Boulant, et al.. Design of strongly modulating pulses to implement precise effective Hamiltonians for quantum information processing, J. Cherru Phys. 116 (17) (2002) 7599-7606. 

The shape of the spectrum significantly depends on the laser pulse duration. For an infinite plane wave, the spectrum consists of well-separated harmonics which are not at integral numbers of the laser wavelength. Their spectral separation depends on the observation angle, the laser intensity, and the initial energy of the electron. In the case of short laser pulses, the motion of the electron becomes strongly modulated in the laser pulse envelope and the consecutive harmonics overlap to form a continuous spectrum. 

Use of strongly modulated RF pulses for quantum gate implementation in NMRQIP... 

WoUenhaupt M, Prakelt A, Sarpe-Tudoran C, liese D, Bayer T, Baumert T (2006) Femtosecond strong-field quantum control with sinusoidtilly phase-modulated pulses. Phys Rev A 73 063409... 

This special pulse sequence uses strong nonselective pulses and gives general enhancement rather than specific sensitivity enhancement, as in SPT. The pulse sequence has a basic polarization-transfer portion that produces a net inversion of one of the proton spin states. Proton transverse magnetization is created by the initial proton 90° pulse and precesses for a period t. The magnetization is then refocused as a spin echo at a time 2r by the action of a 180° proton pulse. Application of a 180° pulse at the midpoint of the 2r delay ensures that the echo is modulated by the scalar coupling, 7ch- If t is chosen to be equal to 1/(4Jch) then at time 2r, the... 

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