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Related Concept Videos

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Updated: Oct 18, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Lock-in detector for accelerated nonlinear imaging.

Torben L Purz, Steven T Cundiff, Eric W Martin

    Optics Letters
    |October 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Replacing a conventional filter with a simple-moving-average (box) lock-in filter in nonlinear imaging significantly reduces data acquisition time. This method enhances signal-to-noise ratio and modulation suppression, enabling faster material characterization.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Spectroscopy

    Background:

    • Accelerated nonlinear imaging techniques like stimulated Raman scattering and pump-probe imaging are crucial for advanced material characterization.
    • Conventional lock-in amplifiers often limit acquisition speed due to their filtering methods, hindering real-time applications.
    • Optimizing signal-to-noise ratio and minimizing artifacts are critical challenges in high-speed imaging.

    Purpose of the Study:

    • To investigate the impact of replacing the exponentially-weighted-moving-average (EWMA) low-pass filter with a simple-moving-average (SMA) filter in lock-in amplifiers for nonlinear imaging.
    • To demonstrate the potential for significant data acquisition time reduction in accelerated nonlinear imaging.
    • To evaluate the performance improvements in signal-to-noise ratio and artifact suppression using the SMA (box) lock-in approach.

    Main Methods:

    • Theoretical modeling and experimental validation of lock-in amplifier performance.
    • Implementation of a simple-moving-average (box) filter as a replacement for the EWMA filter.
    • Comparative analysis of data acquisition times, signal-to-noise ratios, and modulation suppression between conventional and SMA lock-in methods.
    • Application in nonlinear imaging modalities such as stimulated Raman scattering and pump-probe imaging.

    Main Results:

    • An order of magnitude reduction in data acquisition time was achieved by employing the SMA (box) lock-in filter.
    • The SMA lock-in demonstrated a superior signal-to-noise ratio compared to conventional methods, especially at short pixel dwell times.
    • Effective suppression of extraneous modulations was observed with the SMA lock-in, provided a specific condition relating time constant and modulation frequencies is met.
    • Experimental and theoretical results consistently showed the outperformance of the box lock-in for nonlinear imaging applications.

    Conclusions:

    • The simple-moving-average (box) lock-in amplifier offers a significant advancement for accelerated nonlinear imaging.
    • This improved detection method substantially reduces data acquisition time, making ultrafast and nonlinear imaging more practical.
    • The findings pave the way for adopting advanced nonlinear imaging techniques as a new standard in material characterization.