Collimation testing using coherent gradient sensing |
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Authors: | Jitendra Dhanotia Shashi Prakash |
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Institution: | Photonics Laboratory, Department of Electronics and Instrumentation Engineering, Institute of Engineering and Technology, Devi Ahilya University, Khandwa Road, Indore 452017, India |
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Abstract: | In the present communication, an application of coherent gradient sensing (CGS) for collimation testing of an optical beam has been proposed. In the path of the beam to be tested, a set of two identical linear Ronchi gratings is introduced. The diffracted orders from the two gratings traveling in the same direction are isolated using spatial filtering arrangement. The resulting laterally sheared wavefronts carry information regarding the defocusing errors. The grating rotation mechanism has been incorporated for collimation setting. The results of experimental investigation are presented. Improved accuracy and precision has been achieved because the requirement of maintaining the grating separation to be equal to self-imaging distance as in Talbot interferometry has been alleviated. |
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