Interferometry

Cylindrical-lens-based wavefront-reversing shear interferometer for the spatial coherence measurement of UV radiations

[+] Author Affiliations
Om Prakash

Centre for Advanced Technology, Laser System Engineering Division, Indore-452013, India

Ramakanta Mahakud

Centre for Advanced Technology, Laser System Engineering Division, Indore-452013, India

Harilal S. Vora

Centre for Advanced Technology, Laser System Engineering Division, Indore-452013, India

Sudhir K. Dixit

Centre for Advanced Technology, Laser System Engineering Division, Indore-452013, India

Opt. Eng. 45(5), 055601 (May 24, 2006). doi:10.1117/1.2205847
History: Received July 01, 2005; Revised September 26, 2005; Accepted October 13, 2005; Published May 24, 2006
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We present the design and results of a cylindrical-lens-based reversal shear interferometer for measuring the spatial coherence of partially or fully coherent UV beams. This is a modified Michelson interferometer consisting of only four optical components. The wavefront is reversed in one of the interferometer’s arm by the combination of a plane mirror located at the focal plane of a cylindrical lens. The selected wavefront can be sheared at any arbitrary angle with respect to the incident wavefront by rotating the cylindrical lens, thus enhancing the capability of this design for a real 3-D wavefront evaluation. This interferometer is used to measure the spatial coherence of 255-nm UV radiations obtained from the second harmonic of a copper vapor laser for pump beams of different spatial coherence characteristics, a result being reported for the first time.

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© 2006 The Society of Photo-Optical Instrumentation Engineers

Citation

Om Prakash ; Ramakanta Mahakud ; Harilal S. Vora and Sudhir K. Dixit
"Cylindrical-lens-based wavefront-reversing shear interferometer for the spatial coherence measurement of UV radiations", Opt. Eng. 45(5), 055601 (May 24, 2006). ; http://dx.doi.org/10.1117/1.2205847


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