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Double Resonance Techniques: Overview

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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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Published on: October 23, 2018

High-Acquisition-Rate Single-Shot Pump-Probe Measurements Using Time-Stretching Method.

Masataka Kobayashi¹, Yasuo Minami¹, Courtney L Johnson²

¹Graduate School of Engineering, Yokohama National University, Yokohama, 240-8501 Japan.

Scientific Reports

|November 24, 2016

Summary

This study introduces a simplified ultrafast spectroscopy method using optical fiber to slow down signals. This technique enables the study of rapid, unrepeatable events with enhanced real-time data capture.

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Area of Science:

Optics and Photonics
Spectroscopy
Materials Science

Background:

Ultrafast spectroscopy captures rapid signal waveforms in single shots, reducing measurement time for transient phenomena.
Current single-shot methods often use 2D detectors, limiting repetition rates and real-time waveform analysis.

Purpose of the Study:

To develop a simplified, cost-effective single-shot detection scheme for ultrafast spectroscopy.
To overcome the limitations of existing methods regarding repetition rate and real-time data processing.

Main Methods:

A novel method employing a long, single-mode optical fiber and a fast photodiode is presented.
Probe pulses are linearly chirped, encoding the ultrafast signal's temporal profile into the probe spectrum.
Optical fiber dispersion is used to stretch the encoded signal to nanosecond timescales for easy detection.

Main Results:

The method successfully simplifies the detection setup and circumvents limitations of 2D detectors.
Demonstrated applications include studying Kerr signals in LiNbO3, phase change materials, and terahertz waveforms.
Achieved slower timescales compatible with standard fast detectors and high-bandwidth electronics.

Conclusions:

This technique offers a simplified and efficient approach to single-shot ultrafast spectroscopy.
It enables the investigation of unrepeatable phenomena and real-time waveform analysis.
The method holds potential for broader applications in studying dynamic material properties and optical signals.