A mechanism of speckle field damping in a multi-chromatic field

M. V. Vasnetsov; V. S. Voytsekhovich; V. V. Ponevchinsky; N. M. Kachalova; A. A. Khodko; O. D. Mamuta; V. V. Khomenko

doi:10.1117/12.3012836

5 January 2024 A mechanism of speckle field damping in a multi-chromatic field

M. V. Vasnetsov, V. S. Voytsekhovich, V. V. Ponevchinsky, N. M. Kachalova, A. A. Khodko, O. D. Mamuta, V. V. Khomenko

Proceedings Volume 12938, Sixteenth International Conference on Correlation Optics; 129381B (2024) https://doi.org/10.1117/12.3012836
Event: International Conference Correlation Optics (COR 2023), 2023, Chernivtsi, Ukraine

Abstract

We report on an experimental study aimed to suppress the speckle structure produced by a coherent optical field. The technique proposed is based on the reduction of a laser output coherence utilizing enriching the emission spectrum lines. We achieved a temperature-controlled simultaneous emission of two components at 1.064 m and 1.066 m with nearly equal intensities in IR from diode-pumped Nd:YVO4 laser with intracavity second-harmonic generation The emission lines 532 nm, 532.6 nm and 533.1 nm were recorded in the second-harmonic output. The influence of the spectrum variation on the formation of a speckle field was checked. We succeeded to remove intensity zeroes and reduce the contrast (visibility) from 0.92 to 0.65 in a light scattered by a ground glass diffuser at the angle 35°. A simple consideration of the speckle field dumping mechanism is presented.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

M. V. Vasnetsov, V. S. Voytsekhovich, V. V. Ponevchinsky, N. M. Kachalova, A. A. Khodko, O. D. Mamuta, and V. V. Khomenko "A mechanism of speckle field damping in a multi-chromatic field", Proc. SPIE 12938, Sixteenth International Conference on Correlation Optics, 129381B (5 January 2024); https://doi.org/10.1117/12.3012836

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