Small-Force Measurement by Photo-Elastic Transducer


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.

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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.

Conflicts of Interest

The authors declare no conflicts of interest.


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