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However, in recent times either with passive or active schemes, very short optical pulses have been achieved. These pulses may contain only a few oscillations and the slowly varying envelope condition is no longer fulfilled. | However, in recent times either with passive or active schemes, very short optical pulses have been achieved. These pulses may contain only a few oscillations and the slowly varying envelope condition is no longer fulfilled. | ||
Let us consider a slowly varying envelope harmonic field incident on a free charge. | |||
This is reminiscent of the Lorentz - Drude model in the limit where the binding force is zero thus leading to free charges. | |||
On the other hand, we shall consider the opposite limit where the external field is abruptly turned on. | |||
== Titles for the effect we are describing == | == Titles for the effect we are describing == | ||
Revisión del 21:05 24 jul 2007
The initial phase of an alternating field has played a minor role in the force exerted by the field over a free charge. The main reason being that in most cases the transient behaviour has a slowly varying envelope.
However, in recent times either with passive or active schemes, very short optical pulses have been achieved. These pulses may contain only a few oscillations and the slowly varying envelope condition is no longer fulfilled.
Let us consider a slowly varying envelope harmonic field incident on a free charge.
This is reminiscent of the Lorentz - Drude model in the limit where the binding force is zero thus leading to free charges.
On the other hand, we shall consider the opposite limit where the external field is abruptly turned on.
Titles for the effect we are describing
charge scattering due to transient harmonic fields
charge
