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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 17, Iss. 4 — Feb. 15, 1978
  • pp: 526–530

Refractive index changes in germanium due to intense radiation

T. A. Wiggins, J. A. Bellay, and A. H. Carrieri  »View Author Affiliations


Applied Optics, Vol. 17, Issue 4, pp. 526-530 (1978)
http://dx.doi.org/10.1364/AO.17.000526


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Abstract

The changes in the real and imaginary parts of the index of refraction of germanium have been measured at 6943 Å as a function of incident power up to 5 MW/cm2. The results indicate that for nanosecond pulses the primary cause of the change is heating with temperature changes of up to 350°C. In addition, a diffraction grating formed on the surface by interference between the intense beam and a probing beam produces an additional effective change in reflectivity as well as a spatially separated diffracted beam. It is shown that, for a grating spacing of 20 μm, transverse diffusion effects cause no degradation in the effectiveness of the grating.

© 1978 Optical Society of America

History
Original Manuscript: May 16, 1977
Published: February 15, 1978

Citation
T. A. Wiggins, J. A. Bellay, and A. H. Carrieri, "Refractive index changes in germanium due to intense radiation," Appl. Opt. 17, 526-530 (1978)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-17-4-526


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References

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