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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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Related Experiment Video

Updated: Jun 24, 2026

Automated Delivery of Microfabricated Targets for Intense Laser Irradiation Experiments
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Published on: January 28, 2021

Third-generation megahertz-rate pulse burst laser system.

Brian S Thurow1, Aman Satija, Kyle Lynch

  • 1Department of Aerospace Engineering, Auburn University, 211 Davis Hall, Auburn, Alabama 36849, USA. thurow@auburn.edu

Applied Optics
|April 14, 2009
PubMed
Summary
This summary is machine-generated.

A new megahertz-rate pulse burst laser system uses an acousto-optic modulator (AOM) and variable flashlamp driver for flexible, high-power operation. This advanced laser achieves 50 MHz repetition rates and 10 kW peak powers.

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Area of Science:

  • Lasers and Photonics
  • Optical Engineering

Background:

  • Previous generations of pulse burst laser systems had limitations in flexibility and component cost.
  • Advancements in laser technology are crucial for applications requiring high repetition rates and tunable pulse durations.

Purpose of the Study:

  • To describe the design and performance of a third-generation megahertz-rate pulse burst laser system.
  • To highlight key innovations enabling enhanced operational flexibility and efficiency.

Main Methods:

  • Implementation of an economical acousto-optic modulator (AOM) for pulse slicing.
  • Integration of a variable pulse duration flashlamp driver for uniform gain over a ~700 µs window.
  • Demonstration of second-harmonic conversion efficiency using a type II KTP crystal.

Main Results:

  • The new system achieves flexible pulse slicing with variable pulse durations from 10 ns to DC.
  • The laser system delivers bursts of pulses at repetition rates up to 50 MHz.
  • Peak powers of 10 kW are attainable with the described laser design.

Conclusions:

  • The third-generation pulse burst laser system offers significant improvements in performance and operational flexibility.
  • The use of AOM and advanced flashlamp drivers represents a cost-effective advancement in high-repetition-rate laser technology.
  • The demonstrated capabilities pave the way for advanced applications in various scientific and industrial fields.