Measurement of period difference in grating pair based on analysis of far-field intensity patterns

✍ Scribed by Chao Guo; Lijiang Zeng

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 307 KB
• Volume: 281
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2008.03.056

✦ Synopsis

We propose and demonstrate an experimental method for measuring the period difference in grating pair. The method uses the compensating relationship between line-density difference and the Littrow-angle difference of gratings. Far-field intensity patterns of 0th-and À1st-orders diffraction beams are monitored for alignment during the angle measurement. For a pair of $0.676 lm period gratings, the relative period difference was measured to be 798.4 Â 10 À6 with a standard deviation of 2.0 Â 10 À6 .