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Applied Optics

Applied Optics


  • Vol. 28, Iss. 21 — Nov. 1, 1989
  • pp: 4585–4594

Force to frequency conversion by intracavity photoelastic modulation

Wolfgang Holzapfel and Walter Settgast  »View Author Affiliations

Applied Optics, Vol. 28, Issue 21, pp. 4585-4594 (1989)

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Force to frequency conversion (FFC) using the photoelastic effect inside a laser cavity is described. Analytic expressions are derived for scale factor, measurement errors, and laser dependent nonlinearity of appropriate instrument transducers. The influence of the laser pushing and pulling effects on linearity is calculated on the basis of the third-order saturation model. Our experiments with a modular test setup (633 nm) demonstrate FFC to be proportional to a high degree over almost 6 decades of input signal range. From 2 × 10−4 up to 80 N we observed the noise equivalent resolution of 10−4 N. The frequency response of our test setup was established from dc up to some kilohertz. FFC measurement range and resolution can be extended to 10−6 N or smaller values by applying improved laser stabilization and miniaturizing the cavity length and size of photoelastic material.

© 1989 Optical Society of America

Original Manuscript: August 22, 1988
Published: November 1, 1989

Wolfgang Holzapfel and Walter Settgast, "Force to frequency conversion by intracavity photoelastic modulation," Appl. Opt. 28, 4585-4594 (1989)

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