Outline of the contents: !Q~>)$Cf^
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1. Basic Interferometers for Optical Testing T8g\_m
2. Phase-Shifting Interferometry lFtEQ '}
3. Specialized Optical Tests Z_bVCe{
4. Long Wavelength Interferometry 0^V<,CAV
5. Testing of Aspheric Surfaces rAHP5dx:
6. Measurement of Surface Microstructure U'F}k0h?\'
7. Absolute Measurements V]J"v#!{
8. Concluding Remarks