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We have used electro-reflectance measurements to study charge-density-wave(CDW) polarization dynamics at voltages near the CDW depinning onset (Von) inthe quasi-one-dimensional conductor K0.3MoO3 ("blue bronze"). For low voltages,where the phase-slip rate is low, it is expected that the polarizationrelaxation time should be inversely proportional to the CDW diffusion constant,which is expected to diverge at Von. At T=78 K, we observe saturation of therelaxation time at low voltages, suggesting that we are in the low phase-sliplimit and allowing us to estimate the non-critical value of the CDW diffusionconstant D=0.02cm2/s, consistent with the measured phason velocity. At othertemperatures, the relaxation time increases with decreasing volage even at thelowest voltages we could measure. In no case do we observe the expected"critical speeding up", setting an upper limit on the critical region of (V/Von-1)crit < 0.06.

Electro-Optic Search for Critical Divergence of the Charge-Density-Wave Diffusion Constant at the Onset of Depinning