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frequency sweeping
Microwave pulses with different frequencies are obtained by frequency sweeping.
      
Frequency sweeping of emission from heterojunction quantum lasers with pump current modulation
      
Major features of frequency sweeping of emission from heterojunction quantum lasers
      
Laser frequency sweeping does not occur for low current modulation frequencies, corresponding to realization of the quasisteady-state lasing regime.
      
At large amplitudes, nonlinear interactions overwhelm the dissipation causing frequency sweeping and new modes to be excited.
      
Compared with the shock excitation method, the frequency sweeping using a tone-burst function generator is more time-consuming.
      
Figure 7 shows the results of frequency sweeping for the 4 thicknesses.
      
The AD9953 model comes equipped with RAM for nonlinear phase/frequency sweeping.
      
The frequency sweeping is accomplished in discrete increments that are maintained for a user-specified period of time.
      
The model includes in an idealized way both transverse and radial expansion of the solar wind and induces the frequency sweeping effect.
      
The target is then rotated to the next angular step and the frequency sweeping is again performed.
      
The simulation reproduces measurements of the radial mode structure, overall amplitude, and the observed frequency sweeping.
      
The simulations illustrate the dynamics involved in the frequency sweeping mechanism for the heating and acceleration of ions.
      
 

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