Spatially dispersive displacement sensor utilizing a semiconductor gain chip

Ji Bin Horng, Wei Yang Chou, Seth Tsau, Jay Liao, Shih Ming Hsu, Chih Li Chen, Kun Chieh Chang, Yan Kuin Su

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We demonstrate the development of a simply equipped displacement sensor utilizing spatially dispersive confocal technology. It feeds the amplified spontaneous emission (ASE) of a laser diode to a wavelength-selective feedback structure that corresponds to the position of a measured surface. The displacement sensor has a detecting range of 4 μm and precision of less than 2 nm, as proven by the analysis of the spectral shifts of the multipassed amplified output ASE. As compared with traditional sensors, the displacement sensor presented in our study requires fewer components and has as high precision as complex systems and a higher measurement rate due to the simpler strategy of displacement determination.

Original languageEnglish
Pages (from-to)680-684
Number of pages5
JournalApplied optics
Issue number5
Publication statusPublished - 2007 Feb 10

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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