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Double Resonance Techniques: Overview

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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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Series Resonance

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Related Experiment Video

Updated: Jul 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Frequency-sweep generation by resonant self-injection locking.

J Troger, L Thévenaz, P Robert

|December 15, 2007

Summary

This summary is machine-generated.

Researchers developed a new self-injection locking method for diode lasers. This technique uses frequency-shifted feedback to create a laser that sweeps its output frequency, acting as a tunable sweep generator.

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Area of Science:

Optics and Photonics
Laser Physics
Nonlinear Dynamics

Background:

Injection locking is a standard technique to control laser frequency and properties.
Self-injection locking typically aims to stabilize laser output.
Novel applications of feedback mechanisms in lasers are of significant interest.

Purpose of the Study:

To demonstrate a novel application of self-injection locking.
To utilize resonant phase modulation for dynamic frequency control.
To develop a laser-based sweep generator.

Main Methods:

A diode laser was configured for self-injection locking.
The feedback light was phase modulated at a resonant frequency.
The laser's emission frequency dynamics were analyzed.

Main Results:

Successful implementation of self-injection locking to frequency-shifted emission.
Observation of periodic frequency sweeping of the laser output.
Demonstration of the laser operating as a sweep generator.

Conclusions:

Resonant self-injection locking enables dynamic control of laser frequency.
This method provides a novel approach to creating tunable laser sweep generators.
The technique offers a new tool for applications requiring frequency-agile lasers.