Monolithic-integrated microlaser encoder

Renshi Sawada; Eiji Higurashi; Takahiro Ito; Osamu Ohguchi; Mieko Tsubamoto

doi:10.1364/AO.38.006866

Monolithic-integrated microlaser encoder

Renshi Sawada, Eiji Higurashi, Takahiro Ito, Osamu Ohguchi, Mieko Tsubamoto

Machine design and bionic systems

Research output: Contribution to journal › Article

18 Citations (Scopus)

Abstract

We have developed an extremely small integrated microencoder whose sides are less than 1mmlong. It is 1/100 the size of conventional encoders. This microencoder consists of a laser diode, monolithic photodiodes, and fluorinated polyimide waveguides with total internal reflection mirrors. The instrument can measure the relative displacement between a grating scale and the encoder with a resolution of the order of 0.01 mm; it can also determine the direction in which the scale is moving. By using the two beams that were emitted from the two etched mirrors of the laser diode, by monolithic integration of the waveguide and photodiodes, and by fabrication of a step at the edge of the waveguide, we were able to eliminate conventional bulky optical components such as the beam splitter, the quarter-wavelength plate, bulky mirrors, and bulky photodetectors.

Original language	English
Pages (from-to)	6866-6873
Number of pages	8
Journal	Applied Optics
Volume	38
Issue number	33
DOIs	https://doi.org/10.1364/AO.38.006866
Publication status	Published - Nov 20 1999

All Science Journal Classification (ASJC) codes

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

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10.1364/AO.38.006866

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Sawada, R., Higurashi, E., Ito, T., Ohguchi, O., & Tsubamoto, M. (1999). Monolithic-integrated microlaser encoder. Applied Optics, 38(33), 6866-6873. https://doi.org/10.1364/AO.38.006866

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