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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Published on: January 28, 2019

Stable optical phase modulation with micromirrors.

Caleb Knoernschild1, Taehyun Kim, Peter Maunz

  • 1Fitzpatrick Institute for Photonics, Electrical and Computer Engineering Department, Duke University, Durham, North Carolina 27708, USA.

Optics Express
|February 15, 2012
PubMed
Summary
This summary is machine-generated.

We measured micromechanical mirror stability using a Michelson interferometer. This stable mirror was used as an optical phase modulator, achieving full modulation depth with an 11 V voltage.

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Area of Science:

  • Optomechanics
  • Nanotechnology
  • Interferometry

Background:

  • Micromechanical structures are susceptible to thermal mechanical noise, affecting their stability.
  • Precise control over micromechanical components is crucial for advanced optical applications.
  • Optical phase modulation is a key technique in optical communications and sensing.

Purpose of the Study:

  • To measure and demonstrate the interferometric stability of a micromechanical mirror.
  • To utilize the stable micromechanical mirror as an optical phase modulator.
  • To investigate the tunability and modulation capabilities of the realized optical phase modulator.

Main Methods:

  • Utilized a Michelson interferometer to measure the motional fluctuations of a micromechanical mirror.
  • Characterized the position stability, identifying thermal mechanical noise as the dominant factor.
  • Configured the micromechanical mirror to function as an optical phase modulator by reflecting light.

Main Results:

  • Demonstrated high interferometric stability of the micromechanical mirror.
  • Achieved tunable resonant frequency for the optical phase modulator by applying voltage.
  • Obtained a full modulation depth of ±π by resonantly exciting the mirror with 11 V.

Conclusions:

  • The micromechanical mirror exhibits sufficient stability for interferometric applications.
  • The device effectively functions as a tunable optical phase modulator.
  • The demonstrated performance highlights the potential of micromechanical mirrors in optical modulation.