, Volume 5, Issue 4, pp 323–334 | Cite as

An improved technique for the measurement of low optical absorption losses in bulk glass

  • K. I. White
  • J. E. Midwinter
Glasses and Fibres


A thin rod sample is thermally clamped at both ends to provide a rigid mounting and a thermal short-circuit for heating effects associated with surface losses. The ends are index matched with liquid to minimize sample preparation. A laser beam is focused through the sample and the temperature rise due to the absorbed energy is monitored at its centre. Sensitivity is limited to a few dB km−1 optical loss with a laser of 100 mW power. The theory is discussed in detail for this particular geometry and experimental verification presented.


Sample Preparation Laser Beam Communication Network Temperature Rise Optical Absorption 
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Copyright information

© Chapman and Hall Ltd 1975

Authors and Affiliations

  • K. I. White
    • 1
  • J. E. Midwinter
    • 1
  1. 1.Post Office Research DepartmentIpswichUK

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