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Monolithic-integrated microlaser encoder.

R Sawada1, E Higurashi, T Ito

  • 1Nippon Telegraph and Telephone Corporation, 3-9-11 Midoricho, Musashino-shi, Tokyo 180-8585, Japan. rsawada@ilab.ntt.co.jp

Applied Optics
|March 8, 2008
PubMed
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Researchers created a microencoder, 1/100 the size of traditional ones, for precise displacement measurement. This miniaturized optical instrument achieves high resolution and directionality, advancing micro-measurement technology.

Area of Science:

  • Optoelectronics
  • Micro-electromechanical systems (MEMS)

Background:

  • Conventional encoders are bulky and composed of multiple discrete optical components.
  • Miniaturization of optical measurement instruments is crucial for advanced applications.

Purpose of the Study:

  • To develop an extremely small integrated microencoder.
  • To achieve high-resolution relative displacement measurement and direction determination.

Main Methods:

  • Fabrication of a microencoder using a laser diode, monolithic photodiodes, and fluorinated polyimide waveguides.
  • Integration of total internal reflection mirrors and a step at the waveguide edge.
  • Utilizing two beams emitted from etched laser diode mirrors for measurement.

Main Results:

Related Experiment Videos

  • Developed an integrated microencoder with dimensions less than 1 mm, 1/100 the size of conventional encoders.
  • Achieved relative displacement measurement resolution of the order of 0.01 micrometers.
  • Enabled determination of the direction of scale movement.
  • Eliminated the need for bulky conventional optical components like beam splitters and separate photodetectors.

Conclusions:

  • The developed microencoder represents a significant miniaturization of optical encoders.
  • The integrated design offers high precision and functionality in a compact form factor.
  • This technology has potential applications in various fields requiring precise motion sensing.