Electro-optical signal decay

After the switching off of the electric field, the electro-optical signal decays exponentially with time t, and this decay is simply related to the particle geometry [46] ... 

Decay of the Electro-Optical Signal. After switching off the electrical field the electro-optical signal t decays exponentially with time (2) ... 

Fig. 4 (a) The D1 transitions coupled by a fiequency modulated coupling field and two probe fields (one as the signal Qs and another as the control Qc) behaves as the coherently coupled three-level A-type system. The spontaneous decay rate of the excited state 3> is 73 (=271x5.4x10 s for the 5Pi/2 F =3 state), (b) Simplified diagram of the experimental set up. AOM acousto-optic modulator EOM electro-optic modulator, PMF polarization maintaining fiber X/4 quarter-wave plate DL extended-cavity diode laser, M mirror, D photodetector. 

The same effect of densilication on stability has also been observed by Wu et al. in another NLO chromophore, erythrosin-doped polyimide (Pyralin 2611) system. This polymer becomes highly anisotropic on densihcation. An initial decay of 35% of the electrooptic signal is observed for these films when the poled film is heated to 300°C, but there was no further decay after 1 h. At 200°C, there is an initial decay of 30%, but no further decay in 60 h. The electro-optic coefficient of this system was not reported. 

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