Large range stress measurement system based on large frequency difference laser self-mixing interference

Haisha Niu; Lianqing Zhu; Jianjun Song

doi:10.1117/1.OE.57.7.074109

23 July 2018 Large range stress measurement system based on large frequency difference laser self-mixing interference

Haisha Niu, Lianqing Zhu, Jianjun Song

Author Affiliations +

Optical Engineering, Vol. 57, Issue 7, 074109 (July 2018). https://doi.org/10.1117/1.OE.57.7.074109

Abstract

Stress-birefringence measurement is critical in optical glass materials. A laser self-mixing interference (SMI) stress measurement system with a measuring range of 1 deg to 179 deg is presented. The light source of the system is a He-Ne laser with a variable frequency difference. Birefringent external cavity SMI experiments are conducted with the laser with different frequency differences. Experimental results show that a large frequency difference decreases the cross-saturation effect between the two laser eigenstates, and alternate oscillations are more likely to occur, which directly improves the sensitivity and expands the measuring range of the system. A piece of neodymium glass is tested with the system and the results are given, proving that the large frequency difference laser SMI system provides a simple, low-cost, and high-sensitivity stress measurement method.

Citation Download Citation

Haisha Niu, Lianqing Zhu, and Jianjun Song "Large range stress measurement system based on large frequency difference laser self-mixing interference," Optical Engineering 57(7), 074109 (23 July 2018). https://doi.org/10.1117/1.OE.57.7.074109

Received: 19 March 2018; Accepted: 5 July 2018; Published: 23 July 2018

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