Abstract:
Aiming at the difficulties of charactering the optical inhomogeneity of opaque Ge-Sb-Se chalcogenide glasses(internal stripes, cracks, bubbles, uniformity, etc.), a new method was proposed which used the transmission image, line spread function and modulation transfer function(MTF), and the corresponding detection device was also established. On this basis, we studied the internal defects and optical inhomogeneity of the self-made Ge28Sb12Se60(mol%)chalcogenide glass and analyzed the influence of sample flatness and parallelism influence on the test results. The results show the near infrared imaging can clearly detect the stripes distribution and defects in the sample, the line spread function and MTF can characterize the inhomogeneity features semi-quantitatively. The experimental and theoretical average of MTF is with a difference of less than 10% when the surface aperature of samples is less than 1.
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