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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 30 — Oct. 20, 2008
  • pp: 5631–5636

Laser frequency splitting method for high-resolution determination of relative stress-optic coefficient and internal stresses in Nd:YAG crystals

Jinyun Ding, Qibo Feng, Lianqing Zhang, and Shulian Zhang  »View Author Affiliations


Applied Optics, Vol. 47, Issue 30, pp. 5631-5636 (2008)
http://dx.doi.org/10.1364/AO.47.005631


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Abstract

We propose a laser frequency splitting method to determine the relative stress-optic coefficient and internal stresses in Nd:YAG crystals with high resolution. In this method a mirrored Nd:YAG crystal in a circular disk shape is made into an all-internal cavity laser. Once diametral compression force is applied, due to intracavity photoelastic effect, the single laser frequency is split in two. Through measuring the beat frequency of the split frequencies, the relative stress-optic coefficient and internal stresses in the Nd:YAG crystal can be determined according to the proportional relationship. In our experiment the measured value of the stress-optic coefficient, C 111 = 1.27 × 10 12 m 2 / N , is close to the theoretical value; the principal stress difference at the center of the Nd:YAG crystal was also determined. The optical path retardation resolution is approximately 1.5 × 10 8 λ , and correspondingly the principal stress difference resolution is approximately 5   Pa . The resolution is approximately 5–8 orders of magnitude higher than those of conventional methods, therefore even very small residual stresses can be easily determined with this method. Although this method is a kind of point-by-point method instead of a full-field method, it is a promising novel photomechanics method with attractive advantages such as extremely high resolution.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(140.3380) Lasers and laser optics : Laser materials
(140.3480) Lasers and laser optics : Lasers, diode-pumped

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: June 23, 2008
Manuscript Accepted: September 12, 2008
Published: October 15, 2008

Citation
Jinyun Ding, Qibo Feng, Lianqing Zhang, and Shulian Zhang, "Laser frequency splitting method for high-resolution determination of relative stress-optic coefficient and internal stresses in Nd:YAG crystals," Appl. Opt. 47, 5631-5636 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-30-5631


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References

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