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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1988),
  • paper TUQ3

Laser diode interferometry

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Abstract

Laser diodes (LDs) are now of increasing importance in many optoelectronic areas. One use is interferometric metrology. The substantial advantage of LDs in. this case is that they can easily achieve frequency tuning and modulation through internal current control in addition to their compactness, low-electric-power consumption, and low cost. There are various schemes for a LD interferometer; an interesting one is a feedback interferometer in which the interference intensity is fed back to the LD current. The interferogram, e.g., in a Twyman-Green-type interferometer, is stabilized against mechanical noise (vibration) with a stabilization factor of typically 100 over a frequency range of 0-1 kHz.1

© 1988 Optical Society of America

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