Installation of Two Predispersing Systems on the Ellipsometer
Quarterly rept. no. 4
ILLINOIS UNIV CHAMPAIGN
Pagination or Media Count:
This quarter has been devoted to the installation of two predispersing systems on the ellipsometer as well as to the elimination of systematic and random noise. Results a A grating predisperser has been installed which is also driven by the computer and reduces by 4 orders of magnitude the scattered light in the system thereby permitting greater accuracy in the higher photon energy range. b A prism predispersing system has been installed as well which allows us to eliminate higher orders and therefore spares us the need to use automatic filter positioning. c A systematic tracking of all random noise sources has allowed us to improve the signal to noise ratio by a factor of two thereby making it easier to carry out first, second and third numerical derivations of the experimental signal.
- Test Facilities, Equipment and Methods