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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

881
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.
881

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Ultrafast Pulse Generation from Quantum Cascade Lasers.

Feihu Wang1,2,3, Xiaoqiong Qi4, Zhichao Chen1,2,3

  • 1Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

Micromachines
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Summary
This summary is machine-generated.

Generating ultrashort pulses from quantum cascade lasers (QCLs) in the mid-infrared and terahertz ranges is now achievable. This breakthrough enables advanced studies of ultrafast phenomena using QCLs

Keywords:
laser physicsmode-lockingpulse compressionquantum cascade laserssemiconductor lasersterahertz and mid-infraredultrafast dynamics

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Area of Science:

  • • Semiconductor laser technology
  • • Quantum optics and photonics

Background:

  • • Quantum cascade lasers (QCLs) have expanded semiconductor laser capabilities into the mid-infrared (MIR) and terahertz (THz) spectral regions.
  • • Historically, generating ultrashort and intense pulses from QCLs has presented significant challenges.
  • • Ultrafast pulse generation is crucial for studying rapid processes in the MIR and THz domains, leveraging QCLs' tunable wavelength properties.

Purpose of the Study:

  • • To review the historical development and recent advancements in ultrafast pulse generation from QCLs.
  • • To highlight progress in both THz and MIR QCL technologies for ultrashort pulse emission.

Main Methods:

  • • Review of mode-locking techniques and pulse formation mechanisms in QCLs since 2009.
  • • Examination of advancements in ultrafast THz detection methodologies.
  • • Discussion of novel pulse compression technologies developed for QCLs.

Main Results:

  • • Significant progress has been made in mode-locking QCLs over the past decade.
  • • Key developments include understanding pulse formation, improved THz detection, and pulse compression innovations.
  • • Ultrafast pulse generation is now feasible in both THz and MIR QCLs.

Conclusions:

  • • The review details the evolution and current state of ultrafast pulse generation in QCLs.
  • • Recent advancements have overcome previous limitations, opening new research avenues.
  • • This progress facilitates the application of QCLs in studying ultrafast phenomena across THz and MIR spectra.