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-78-dB shot-noise limited optical low-coherence reflectometry at 42-m/s scan speed

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8 Author(s)
Lindgren, F. ; Inst. of Appl. Opts., Swiss Federal Inst. of Technol., Lausanne, Switzerland ; Gianotti, R. ; Walti, R. ; Salathé, R.P.
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We report, to our knowledge, the fastest longitudinal scans in optical low-coherence reflectometry published in literature. The use of a rotating glass cube as an optical path length variator results in a longitudinal scan speed of 42 m/s at a longitudinal scan repetition rate of 1240 Hz. The high-speed reflectometer is operated at the shot-noise limit corresponding to a sensitivity of -78 dB. The scalability of the scanning method with respect to scan speed, scan repetitiveness and scan length is demonstrated by the use of differently sized glass cubes.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 12 )