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Applied Optics

Applied Optics


  • Vol. 24, Iss. 17 — Sep. 1, 1985
  • pp: 2762–2770

Diagnostic techniques and UV-induced degradation of the mirrors used in the Orsay storage ring free-electron laser

P. Elleaume, M. Velghe, M. Billardon, and Jean M. Ortega  »View Author Affiliations

Applied Optics, Vol. 24, Issue 17, pp. 2762-2770 (1985)

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Due to its low gain, the Orsay storage ring free-electron laser necessitates the use of high reflectivity mirrors. Three techniques for measuring the mirror losses are presented, based on cavity decay time measurements using either an external laser, the synchrotron radiation stored in the cavity, or the free-electron laser itself. The high signal-to-noise ratio allowed the detection of loss variations as low as 10−7/sec1/2. From these diagnostics three distinct processes of UV-induced degradation of TiO2/SiO2 dielectric mirrors were identified. One was a surface absorption of the upper SiO2–air interface; it was not affected by annealing. The other two corresponded to a volume absorption of the layers which completely recovered after annealing.

© 1985 Optical Society of America

Original Manuscript: November 15, 1984
Published: September 1, 1985

P. Elleaume, M. Velghe, M. Billardon, and Jean M. Ortega, "Diagnostic techniques and UV-induced degradation of the mirrors used in the Orsay storage ring free-electron laser," Appl. Opt. 24, 2762-2770 (1985)

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  1. M. Billardon et al., “First Operation of a Storage Ring Free-Electron Laser,” Phys. Rev. Lett. 51, 1652 (1983). [CrossRef]
  2. P. Elleaume, D. A. G. Deacon, M. Billardon, J. M. Ortega, “UV and VUV Degradation of Very High Reflectivity Mirrors for Use in a Storage-Ring Free-Electron Laser,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1983), paper THJ3.
  3. M. Billardon et al., “Recent Results of the ACO Storage Ring FEL Experiment,” J. Phys. Paris Colloq. 44, Cl-73 (1983).
  4. J. M. Herbelin et al., “Sensitive Measurement of Photon Lifetime and True Reflectances in an Optical Cavity by a Phase-Shift Method,” Appl. Opt. 19, 144 (1980). [CrossRef] [PubMed]
  5. N. A. Vinokurov, U. N. Litvinenko, “Method for Measuring Reflection Coefficients Near Unity,” Preprint INP 79–24 (Institute of Nuclear Physics, 630090 Novosibirsk, U.S.S.R.).
  6. W. G. Driscoll, W. Vaughan, Eds. Handbook of Optics, (McGraw-Hill, New York, 1978), gives values for the absorption and scattering losses in air. At 6328 Å at sea level, aerosol scattering dominates all other loss mechanisms. The propagation distance to be expected in the laboratory depends on the concentration of dust, forepump vapor, and other aerosols in the air but should clearly lie between the values quoted for clear air (37.6 km) and hazy air (1.2 km).
  7. A. Yariv, Quantum Electronics (Wiley, New York, 1975), Chap. 7.
  8. Ojai Research, 11554 Ventura Ave., Ojai, Calif. 93023.
  9. W. B. Colson, P. Elleaume, “Transverse Mode Dynamics in a Free-Electron Laser,” Appl. Phys. B 29, 101 (1982). [CrossRef]

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