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Updated: Mar 21, 2026

High-resolution Fiber-optic Microendoscopy for in situ Cellular Imaging
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IR Image upconversion using band-limited ASE illumination fiber sources.

H Maestre, A J Torregrosa, J Capmany

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    |May 4, 2016
    PubMed
    Summary

    This study enhances upconversion imaging systems by using Amplified Spontaneous Emission (ASE) fiber sources. This broadens the field-of-view (FOV) compared to lasers, improving imaging capabilities.

    Area of Science:

    • Photonics
    • Optical Imaging
    • Nonlinear Optics

    Background:

    • Upconversion imaging systems traditionally use narrowband lasers or thermal illumination.
    • Narrowband lasers limit the field-of-view (FOV) due to phase-matching constraints.
    • Thermal illumination offers a broad spectrum but lacks spectral intensity.

    Purpose of the Study:

    • To investigate the use of Amplified Spontaneous Emission (ASE) fiber sources in upconversion imaging.
    • To analyze how ASE sources affect the angular acceptance and FOV of upconversion systems.
    • To develop a predictive model for the upconverter's angular acceptance.

    Main Methods:

    • Utilizing an ASE fiber source for illuminating a transmission target in an upconversion imaging setup.
    • Developing a theoretical model to predict angular acceptance based on spectral width and allocation.

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  • Experimentally validating the model using a 1550-630 nm upconversion process.

    • Main Results:

    • ASE fiber sources provide higher spectral intensity than thermal sources while maintaining a broad spectrum.
    • The broad spectrum of ASE sources enables larger non-collinear phase-matching angles, expanding the FOV.
    • The developed model accurately predicts the angular acceptance of the upconverter.

    Conclusions:

    • ASE fiber sources offer a superior alternative to narrowband lasers for upconversion imaging, significantly enhancing FOV.
    • The predictive model is a valuable tool for optimizing upconversion system design.
    • This approach expands the applicability of upconversion imaging in various scientific fields.