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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Probing coherence in microcavity frequency combs via optical pulse shaping.

Fahmida Ferdous1, Houxun Miao, Pei-Hsun Wang

  • 1School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, IN 47907-2035, USA. fferdous@purdue.edu

Optics Express
|October 6, 2012
PubMed
Summary

Researchers explored silicon nitride microcavity frequency combs, finding that spectral evolution impacts temporal coherence. Manipulating spectral lines revealed varying coherence, supporting a model of partially coherent comb formation.

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Area of Science:

  • Photonics and optical physics
  • Quantum optics and nonlinear optics

Background:

  • Microcavity frequency combs are crucial for precise optical frequency generation.
  • Cascaded four-wave mixing in microresonators can lead to complex spectral structures.
  • Understanding the relationship between spectral properties and temporal coherence is key for comb applications.

Purpose of the Study:

  • To investigate the spectral evolution and coherence properties of a silicon nitride microcavity frequency comb.
  • To probe the internal coherence structure of a partially coherent frequency comb.
  • To validate a model for partially coherent comb formation.

Main Methods:

  • Utilizing a silicon nitride microresonator exhibiting cascaded four-wave mixing.
  • Employing a pulse shaper to manipulate spectral lines and their phases.
  • Analyzing the mutual coherence between different spectral line groups.

Main Results:

  • Observed spectral line filling to achieve single free spectral range (FSR) spacing from multiple FSR initial spacing.
  • Demonstrated significant variations in mutual coherence across different spectral line subsets.
  • Provided experimental evidence supporting a model of partially coherent comb formation.

Conclusions:

  • The spectral structure of microcavity frequency combs is intrinsically linked to their temporal coherence.
  • Partial coherence in frequency combs exhibits complex, non-uniform characteristics.
  • The study offers insights into controlling and understanding coherence in nonlinear optical systems.