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Applied Optics

Applied Optics


  • Vol. 33, Iss. 24 — Aug. 20, 1994
  • pp: 5557–5563

Applications of an extremely short strong-feedback configuration of an external-cavity laser diode system fabricated with GaAs-based integration technology

Hiroo Ukita, Yuji Uenishi, and Yoshitada Katagiri  »View Author Affiliations

Applied Optics, Vol. 33, Issue 24, pp. 5557-5563 (1994)

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A composite-cavity laser diode is used to monitor the reflectivity or the displacement of the external-cavity mirror for micromechanical photonics devices. Optical disk bits are read out in the near field from the difference in medium reflectivity with an antireflection-coated laser diode and a photodiode. Microbeam vibration is also detected in the near field from the phase difference with an uncoated laser diode and a photodiode. In both cases the carrier-to-noise ratio is very high (more than 45 dB) because of the lack of mode-hopping noise resulting from the extremely short (less than 3 μm) external-cavity length and strong light feedback. These composite-cavity laser diode microdevices are fabricated on a gallium arsenide substrate to eliminate the need for optical alignment.

© 1994 Optical Society of America

Original Manuscript: October 8, 1993
Revised Manuscript: January 21, 1994
Published: August 20, 1994

Hiroo Ukita, Yuji Uenishi, and Yoshitada Katagiri, "Applications of an extremely short strong-feedback configuration of an external-cavity laser diode system fabricated with GaAs-based integration technology," Appl. Opt. 33, 5557-5563 (1994)

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