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Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Updated: May 24, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

Electromagnetically induced transparency with quantum interferometry.

Anindita Bhattacharjee1, Krishna Rai Dastidar

  • 1anny_b_2000@yahoo.com

The Journal of Chemical Physics
|March 3, 2012
PubMed
Summary

Electromagnetically induced transparency (EIT) is achieved using control-probe interferometry with two delayed, phase-locked ultrashort pulses. This method allows designing and switching transparency windows for lossless light transmission in molecules.

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Area of Science:

  • Quantum Optics
  • Molecular Spectroscopy
  • Laser Physics

Background:

  • Electromagnetically induced transparency (EIT) is a quantum interference effect.
  • Ultrashort pulse interactions with molecules offer pathways to control quantum dynamics.

Purpose of the Study:

  • To demonstrate electromagnetically induced transparency (EIT) using control-probe interferometry.
  • To design and control transparency windows in molecular systems using femtosecond pulses.

Main Methods:

  • Utilizing two delayed, phase-locked ultrashort pulses for control-probe interferometry.
  • Exciting two vibrational wavepackets on the excited state to induce interference.
  • Manipulating pulse phase difference and delay to control absorption and transparency.

Main Results:

  • Achieved EIT by controlling constructive or destructive interference of vibrational wavepackets.
  • Demonstrated the ability to design distinct transparency windows by adjusting pulse parameters.
  • Showcased switching between transparency windows for even and odd vibrational levels.
  • Confirmed lossless transmission of light frequencies through designed transparency windows.

Conclusions:

  • Control-probe quantum interferometry enables the design of single- or multi-mode transparency windows in molecules like NaH.
  • The developed method allows for dynamic switching of transparency, offering precise control over light-matter interactions.