Multichip Module High Speed Testing
Abstract
One problem we have characterized is the degradation of the poled polymer due to high visible light intensities. Our low signal-to-noise ratios in the experiment have led us to increase the incident optical intensity on the polymer; however, at light intensities of approximately 10 mW (632 nm HeNe) we observe a degradation of the signal over minutes of time. Since the material could not be repoled by heating it to the glass transition temperature (132 deg C) under voltage, we conclude that the signal loss is not due to depoling or bleaching of the polymer but rather to the photon-induced or thermal decomposition of the material. This is consistent with the fact that optical absorption in the polymer rises rapidly with wavelength in the visible region. We have not noticed such signal degradation at 780 nm wavelengths, but the optical power available to us at that wavelength is lower (5 mW maximum). We are planning to investigate wavelengths in the 700 nm region which should reduce the degradation effects but still permit visible optical alignment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 1994
- Accession Number
- ADA278002
Entities
People
- David H. Auston
- Robert J. Davis
Organizations
- Columbia University