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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

965
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.
965

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Frequency axis for swept dual-comb spectroscopy with quantum cascade lasers.

Michele Gianella, Simon Vogel, Valentin J Wittwer

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    This study presents a new method for mapping optical comb frequencies without reference lasers. It accurately determines the spectral point spacing for free-running quantum cascade laser frequency combs.

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    Area of Science:

    • Quantum optics
    • Spectroscopy
    • Laser physics

    Background:

    • Dual-comb spectroscopy relies on a direct frequency map between beat notes and optical comb lines.
    • Reference lasers are typically used to determine this map.
    • Free-running quantum cascade laser frequency combs lack this reference, complicating frequency determination.

    Purpose of the Study:

    • To develop a method for determining the RF-to-optical frequency map for free-running quantum cascade laser frequency combs.
    • To enable accurate spectral analysis without external frequency references.

    Main Methods:

    • Utilizing an unbalanced Mach-Zehnder interferometer to measure the comb shift.
    • Determining spectral point spacing via intermode beat measurements on laser electrodes.

    Main Results:

    • A novel method for frequency mapping of quantum cascade laser combs is demonstrated.
    • The spectral axis is achieved with high accuracy of approximately 0.001 cm⁻¹.

    Conclusions:

    • The proposed method provides a robust solution for frequency calibration of free-running quantum cascade laser frequency combs.
    • This technique enhances the utility of quantum cascade laser frequency combs in various spectroscopic applications.