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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Related Experiment Video

Updated: May 23, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Frequency-comb-referenced singly-resonant OPO for sub-Doppler spectroscopy.

I Ricciardi1, E De Tommasi, P Maddaloni

  • 1INO–CNR, Istituto Nazionale di Ottica, Sezione di Napoli, and LENS, European Laboratory for Nonlinear Spectroscopy, Via Campi Flegrei 34, I-80078 Pozzuoli (NA), Italy.

Optics Express
|April 20, 2012
PubMed
Summary
This summary is machine-generated.

We developed a widely tunable optical parametric oscillator (OPO) phase-locked to a frequency comb. This system achieves high precision spectroscopy for molecules like CH₃I.

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

Published on: May 30, 2014

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Last Updated: May 23, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

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

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

Published on: May 30, 2014

Area of Science:

  • Quantum Optics
  • Spectroscopy
  • Metrology

Background:

  • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
  • Precise frequency control of lasers is essential for advanced spectroscopic applications.
  • Phase-locking lasers to frequency combs enables high-accuracy measurements.

Purpose of the Study:

  • To develop a widely tunable, singly-resonant OPO.
  • To phase-lock the OPO to a self-referenced frequency comb for enhanced stability.
  • To demonstrate the spectroscopic capabilities of the phase-locked OPO.

Main Methods:

  • Utilized a singly-resonant OPO emitting >1 W between 2.7 and 4.2 μm.
  • Phase-locked both pump and signal frequencies to a near-infrared (NIR) femtosecond mode-locked fiber laser frequency comb.
  • Linked the frequency comb to the caesium primary standard for absolute frequency referencing.

Main Results:

  • Achieved a fractional Allan deviation of ~3 × 10⁻¹²τ⁻½ for the idler frequency.
  • Performed saturation spectroscopy on CH₃I transitions, resolving hyperfine structure.
  • Estimated an idler linewidth <200 kHz FWHM and determined absolute frequencies with 50-kHz uncertainty.

Conclusions:

  • The phase-locked OPO provides a stable and tunable light source for high-resolution spectroscopy.
  • Demonstrated the capability to resolve fine spectral features and determine absolute molecular frequencies with high accuracy.
  • This technology advances precision measurements in molecular spectroscopy and metrology.