title: Spatially dispersive displacement sensor utilizing a semiconductor gain chip.
abstract: 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 microm 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.
authors.affiliation: Laser Application Technology Center, Industrial Technology Research Institute, Tainan County, Taiwan.
authors.forename: Ji-Bin
authors.initials: JB
authors.lastname: Horng
authors.forename: Wei-Yang
authors.initials: WY
authors.lastname: Chou
authors.forename: Seth
authors.initials: S
authors.lastname: Tsau
authors.forename: Jay
authors.initials: J
authors.lastname: Liao
authors.forename: Shih-Ming
authors.initials: SM
authors.lastname: Hsu
authors.forename: Chih-Li
authors.initials: CL
authors.lastname: Chen
authors.forename: Kun-Chieh
authors.initials: KC
authors.lastname: Chang
authors.forename: Yan-Kuin
authors.initials: YK
authors.lastname: Su