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An all-optical trap for a gram-scale mirror.

Thomas Corbitt1, Yanbei Chen, Edith Innerhofer

  • 1LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|May 16, 2007
PubMed
Summary
This summary is machine-generated.

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We developed a stable optical trap using two laser fields to control a macroscopic mirror with radiation pressure. This technique achieves intrinsic cooling and stiffness comparable to diamond, without adding thermal noise.

Area of Science:

  • Optics and Photonics
  • Quantum Measurement
  • Precision Metrology

Background:

  • Optical traps typically use single beams, which can introduce thermal noise.
  • Controlling macroscopic objects with light requires overcoming thermal effects and achieving high stiffness.

Purpose of the Study:

  • To demonstrate a stable optical trap for macroscopic objects.
  • To utilize radiation pressure for precise control and cooling.
  • To achieve optical stiffness exceeding that of diamond.

Main Methods:

  • Employing two frequency-offset laser fields to generate optical restoring and damping forces.
  • Optically trapping a 1-gram mirror using radiation pressure.
  • Measuring the effective temperature and inferred Young's modulus of the optical spring.

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Main Results:

  • Demonstrated stable optical trapping of a macroscopic mirror.
  • Achieved an optical spring with an inferred Young's modulus of 1.2 TPa, stiffer than diamond.
  • Reached an intrinsically cold effective temperature of 0.8 K, limited by technical noise.

Conclusions:

  • Radiation pressure can be used to create stiff, cold optical traps for macroscopic objects.
  • The demonstrated technique offers a novel approach for precision measurements and quantum experiments.
  • Further improvements in technical noise reduction could lead to even lower effective temperatures.