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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.
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Published on: December 3, 2013

Complete spatial and temporal locking in phase-mismatched second-harmonic generation.

Eugenio Fazio1, Federico Pettazzi, Marco Centini

  • 1Ultrafast Photonics Laboratory, Dipartimento di Energetica and CNISM, Sapienza Università Roma, via Scarpa 16, I-00161 Roma Italy-UE. eugenio.fazio@uniroma1.it

Optics Express
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

We demonstrated simultaneous phase and group velocity locking for fundamental and second harmonic pulses in Lithium Niobate. This phase-locked pulse follows the pump pulse trajectory, even at oblique incidence.

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Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Materials Science

Background:

  • Second harmonic generation (SHG) is crucial for frequency conversion in nonlinear optical materials.
  • Phase mismatch typically limits the efficiency and control of SHG, especially in pulsed regimes.
  • Understanding pulse dynamics at material interfaces is key for advanced optical applications.

Purpose of the Study:

  • To experimentally demonstrate simultaneous phase and group velocity locking of fundamental and second harmonic (SH) pulses.
  • To investigate the behavior of SH pulses generated under phase-mismatched conditions at oblique incidence.
  • To provide evidence for the effective dispersion of phase-locked SH pulses matching that of the pump pulse.

Main Methods:

  • Experimental setup utilizing Lithium Niobate as the nonlinear material.
  • Pulsed second harmonic generation at the interface between linear and second-order nonlinear media.
  • Analysis of forward-propagating SH pulses at both normal and oblique incidence.

Main Results:

  • Observed two distinct forward-propagating SH pulses: a homogeneous pulse and a phase-locked pulse.
  • Demonstrated that at oblique incidence, the phase-locked SH pulse travels with the same group velocity and trajectory as the fundamental pump pulse.
  • Showcased spatially separate SH spots due to the distinct refraction of the homogeneous pulse.

Conclusions:

  • Simultaneous phase and group velocity locking of fundamental and SH pulses is achievable in phase-mismatched Lithium Niobate.
  • The phase-locked SH pulse is trapped by the pump pulse, following its trajectory, particularly evident at oblique incidence.
  • Experimental results provide direct evidence for the effective dispersion of the phase-locked pulse being similar to the pump pulse dispersion.