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Ultrasensitive laser measurements without tears.

P C Hobbs1

  • 1IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA.

Applied Optics
|February 1, 1997
PubMed
Summary

New all-electronic noise cancellation circuits enable ultrasensitive optical measurements with noisy lasers by eliminating excess intensity noise. These inexpensive devices achieve shot-noise-limited performance, simplifying complex setups.

Area of Science:

  • Instrumentation and Measurement
  • Optical Physics
  • Electronics Engineering

Background:

  • Noisy lasers introduce significant error in sensitive optical measurements.
  • Existing techniques for noise reduction are often complex or insufficient.

Purpose of the Study:

  • To present easily implemented, all-electronic noise cancellation circuits for ultrasensitive optical measurements.
  • To enable shot-noise-limited measurements even with noisy lasers.

Main Methods:

  • Development of electronic circuits that subtract photocurrents with feedback for noise cancellation.
  • Application of these circuits in dual-beam or homodyne optical measurement setups.
  • Optimization for wideband, differential, or ratio-only measurements.

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Main Results:

  • Amplitude noise reduction of 55-70 dB or more, achieving shot-noise limits.
  • High signal-to-noise ratios (150-160 dB at 1 Hz) with simple, inexpensive devices.
  • Effective operation from DC to several megahertz, extensible to 100 MHz.

Conclusions:

  • These noise cancellation circuits offer a cost-effective and simpler alternative to complex systems for ultrasensitive optical measurements.
  • They significantly improve measurement accuracy by mitigating laser intensity noise.
  • The devices are versatile and applicable across various optical measurement scenarios.