Dual-prism interferometer for collimation testing.
An air-wedge lateral-shear interferometer using two prisms is presented. With a variable shear, the interferometer is suitable for testing collimation of a wide range of beam sizes down to a few millimeters in diameter. No antireflection coatings are necessary. Collimation for a light source with short coherent length is also demonstrated.
Hii
King Ung
KU
Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Kwek
Kuan Hiang
KH