Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Refractive-index dispersion measurement of bulk optical materials using a fiber raman laser widely tunable in the visible and near-infrared


We propose a simple, highly sensitive fiber-optic autocollimation method for refractive-index dispersion measurement of solid-state and liquid bulk optical materials using a double-pass fiber Raman laser with Littrow-prism-tuned emission. The optical fiber is a key element of the scheme and serves simultaneously as a point laser source for the test, as a highly sensitive point receiver (or spatial filter) of the autocollimation backreflectance signal and as a medium for nonlinear frequency conversion and generation of a broadband continuum spectrum. When the Raman medium is a graded-index multimode fiber with powerful pumping (over 100 kW) using the second harmonic of a Q-switched Nd:YAG laser (λp=532nm), we obtain widely tunable (0.54-1.01 μm) generation in both the visible and near-IR ranges. The results obtained in the refractive-index dispersion measurements are fitted to the Sellmeier dispersion equation and the standard deviation of the experimental data from the analytical curve does not exceed 5x10-5.

This is a preview of subscription content, log in to check access.


  1. 1)

    W. Tropf, M. Thomas and T. Harris:Handbook of Optics, ed. M. Bass (McGraw-Hill, New York, 1995) Vol. 2, Chap. 33, p. 33. 1.

  2. 2)

    P. Shaffer: Appl. Opt.10 (1971) 1034.

  3. 3)

    S. Mitachi and T. Miyashita: Appl. Opt.22 (1983) 2419.

  4. 4)

    C. Carniglia, K. Schrader, P. O’Connell and S. Tuenge: Appl. Opt.28 (1989) 2902.

  5. 5)

    O. Stavroudis and L. Sutton: J. Opt. Soc. Am.51 (1961) 368.

  6. 6)

    B. Tatian: Appl. Opt.23 (1984) 4477.

  7. 7)

    G. Ghosh, M. Endo and T. Iwasaki: J. Lightwave Technol.12 (1994) 1338.

  8. 8)

    J. Dakin and B. Culshaw eds.:Optical Fiber Sensors: Principles and Components (Artech House, Dedham, MA, 1988) Chap. 1, p. 1.

  9. 9)

    E. Udd: Rev. Sci. Instrum.66 (1995) 4015.

  10. 10)

    Z. Zhou and F. Liu: J. Opt. Soc. Am. A8 (1991) 322.

  11. 11)

    I. Ilev: Appl. Opt.34 (1995) 1741.

  12. 12)

    I. Ilev: Opt. Commun.119 (1995) 513.

  13. 13)

    G. Agrawal:Nonlinear Fiber Optics (Academic Press, London, 1989) Chap. 8, p. 218.

  14. 14)

    C. Lin: J. Lightwave Technol.LT-4 (1986) 1103.

  15. 15)

    L. Cohen and C. Lin: IEEE I. Quantum Electron.QE-14 (1978) 855.

  16. 16)

    I. Ilev, H. Kumagai, K. Toyoda and I. Koprinkov: Appl. Opt.35 (1996) 2548.

Download references

Author information

Correspondence to Ilko K. Ilev or Hiroshi Kumagai or Koichi Toyoda.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Ilev, I.K., Kumagai, H. & Toyoda, K. Refractive-index dispersion measurement of bulk optical materials using a fiber raman laser widely tunable in the visible and near-infrared. Optical Review 4, A61 (1997).

Download citation

Key Words

  • fiber-optic autocollimation method
  • double-pass fiber Raman laser
  • refractive-index dispersion