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Small-Force Measurement by Photo-Elastic Transducer

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DOI: 10.4236/opj.2014.41003    3,580 Downloads   5,907 Views   Citations

ABSTRACT

The use of stress-induced changes in a crystal of a monolithic solid-state laser by external force as a way for micro-force detection and measurement is described. In fact, the application of an unknown force on the resonator-amplifier crystal of a solid-state laser leads to a measurable change in the frequency of the beat note associated with the orthogonal polarisation components of the oscillating laser mode. Here we report our first measurements of the sensitivity of a photo-elastic force sensor, realised with a monolithic (4 × 4) mm plano-convex cylindrical crystal, and compare them with the results obtained by other authors for different configurations and dimensions of the laser sensor. The reported results are in a good mutual agreement but show notable discrepancies with theoretical predictions, especially for high sensitivities obtained when the dimensions of the laser sensor are small.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

N. Khelifa, "Small-Force Measurement by Photo-Elastic Transducer," Optics and Photonics Journal, Vol. 4 No. 1, 2014, pp. 14-20. doi: 10.4236/opj.2014.41003.

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