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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Multiple-frequency injection-seeded nanosecond pulsed laser without parasitic intensity modulation.

D Penninckx, J Luce, R Diaz

|July 16, 2016

Summary

This study demonstrates a nanosecond Nd:YAG Q-switched laser producing pulses with broad spectral bandwidth and smooth temporal waveforms. These advanced laser pulses effectively mitigate Kerr effect impacts and suppress stimulated Brillouin scattering.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Laser Physics
Nonlinear Optics

Background:

Q-switched lasers are crucial for various applications.
Controlling laser pulse characteristics is essential for mitigating nonlinear effects.
Stimulated Brillouin scattering and Kerr effect can limit laser performance.

Purpose of the Study:

To develop a nanosecond Nd:YAG Q-switched laser with improved pulse properties.
To investigate the generation of laser pulses with large spectral bandwidth and smooth temporal waveforms.
To analyze the influence of injection seeder parameters on pulse characteristics.

Main Methods:

Utilized a phase-modulated injection seeder for a nanosecond Nd:YAG laser.
Performed a parametric study of generated pulse features against injection conditions.
Analyzed pulse spectral bandwidth and temporal waveform.

Main Results:

Successfully operated a nanosecond Nd:YAG Q-switched laser producing pulses with both large spectral bandwidth and smooth temporal waveform.
Demonstrated that smooth temporal waveforms reduce Kerr effect impact.
Showed that large spectral bandwidth suppresses stimulated Brillouin scattering.
Identified phase modulation frequency as important but not critical, requiring no specific feedback.

Conclusions:

Phase-modulated injection seeding offers a viable method for generating high-quality nanosecond laser pulses.
The developed laser system provides enhanced pulse characteristics beneficial for nonlinear optics applications.
Optimized injection conditions allow for precise control over laser pulse properties, reducing detrimental nonlinear effects.