A simple method for testing laser beam collimation

✍ Scribed by D.S. Mehta; H.C. Kandpal

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 267 KB
• Volume: 29
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(97)00033-9

✦ Synopsis

A simple and improved method is proposed for testing laser beam collimation by a new type of grating, comprising concentric equilateral triangles and the mirror images of these triangles. Although this type of grating possesses onedimensional periodicity in a particular direction and inherent defects in periodicity, the moire fringe pattern formed by placing an exact replica of such a grating at its self-imaging plane shows that the self-imaging phenomenon takes care of the defects in the periodic objects.