Dynamic interference fringes generated by optical interferometer for laser speckle reduction

Zhaomin Tong; Akram Muhammad Nadeem; Xuyuan Chen

doi:10.1117/12.975950

11 September 2012 Dynamic interference fringes generated by optical interferometer for laser speckle reduction

Zhaomin Tong, Akram Muhammad Nadeem, Xuyuan Chen

Proceedings Volume 8413, Speckle 2012: V International Conference on Speckle Metrology; 84131M (2012) https://doi.org/10.1117/12.975950
Event: SPECKLE 2012: V International Conference on Speckle Metrology, 2012, Vigo, Spain

Abstract

A speckle reduction apparatus is proposed by using an optical interferometer to introduce temporally changing interference fringes. With the help of the vibration of a mirror, diverse interference fringes and speckle patterns are added together in the intensity basis during the exposure time of the CCD camera, which result in a summed speckle image having lower speckle contrast. Experimentally, we have demonstrated the speckle reduction efficiency by this method, and compared with another approach by only using the modulation beam. The obtained speckle contrast is 0.66 after using both the modulation beam and the reference beam, which is lower than the 0.77 speckle contrast by only using the modulation beam. We conclude that the introduction of interference fringes helps the speckle reduction.

Citation Download Citation

Zhaomin Tong, Akram Muhammad Nadeem, and Xuyuan Chen "Dynamic interference fringes generated by optical interferometer for laser speckle reduction", Proc. SPIE 8413, Speckle 2012: V International Conference on Speckle Metrology, 84131M (11 September 2012); https://doi.org/10.1117/12.975950

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