RELIABILITY STUDY OF HOLOGRAPHIC OPTICAL-ELEMENTS MADE WITH DUPONT PHOTOPOLYMER

We report reliability-test results of transmission-type holographic op tical elements (HOE's) made with the DuPont photopolymer HRF-600. The reliability tests performed include 6000 cycles of liquid-to-liquid th ermal-shock cycling (-55 degrees C-125 degrees C), 2200 cycles of air- to-air thermal cycling (-55 degrees C-125 degrees C), 1500 h of humidi ty testing (85 degrees C and a relative humidity of 85%), and 675 h of burn-in testing at 125 degrees C. A total of 210 holograms was tested , with 532 data points collected for diffraction-efficiency measuremen ts. The results show that the average efficiency change after these te sts is in the range of -4% to 0% and the standard deviation is only si milar to 10%. (C) 1998 Optical Society of America