Advertisement

A Calorimetric Technique for the Measurement of Low Optical Absorption Losses in Bulk Glass and Optical Communication Fibres

  • K I White
  • J E Midwinter
Part of the Optical Physics and Engineering book series (OPEG)

Abstract

In the bulk glass measurement, a pair of thin rod samples are rigidly mounted in a massive brass enclosure. As the rod ends are immersed in index matching liquid, no optical polishing is necessary. One sample is illuminated by a laser beam and the temperature rise due to the absorbed energy is measured by a thermocouple. For the fibre measurement, the solid rod is replaced by a fibre led through a silica tube filled with a low index liquid. A laser power of 100mW gives a sensitivity of 1dB/Km limited by thermocouple Johnson noise. Replacing the fibre by a fine resistance wire conducting a known current provides a calibration of the apparatus.

Keywords

Silica Tube Bulk Glass Fibre Absorption Direct Illumination Thermocouple Wire 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    K G Kao and T W Davies, J. Sci. Instr 1 (1968) 1063–1068ADSCrossRefGoogle Scholar
  2. C R Wright and K C Kao, J. Sci. Instr 2 (1969) 331–335CrossRefGoogle Scholar
  3. [2]
    D A Pinnow, T C Rich, F W Ostermeyer, Jr., and M Di Domenico, Jr., Appl. Phys. Lett. 22(1973) 527–529ADSCrossRefGoogle Scholar
  4. [3]
    F W Ostermeyer Jr., and W W Benson, Appl. Opt. 13 (1974) 1900–1902ADSCrossRefGoogle Scholar
  5. [4]
    K I White and J E Midwinter, Opto-electronics 5 (1973) 323–334CrossRefGoogle Scholar
  6. [5]
    H S Carslaw and J C Jaeger, Conduction of Heat in Solids, p 493 Clarendon Press, Oxford (1959)Google Scholar
  7. [6]
    D E Sharp and L B Gînther, J. Am. Ceram. Soc. 34 (1951) 260–271CrossRefGoogle Scholar
  8. [7]
    Johnson Matthey Metals Ltd, London UKGoogle Scholar
  9. [8]
    Keithley Instruments, Ohio, USAGoogle Scholar

Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • K I White
    • 1
  • J E Midwinter
    • 1
  1. 1.Post Office Research CentreMartlesham HeathIpswich, SuffolkUK

Personalised recommendations