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Updated: Apr 11, 2026

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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
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Fiber optical parametric amplification of low-photon-flux microscopy signals
J Demas1,2, L Tan1, S Ramachandran1
1Boston University Department of Electrical Engineering, 8 St. Mary's St., Boston, MA 02215, USA.
Biorxiv : the Preprint Server for Biology
|April 10, 2026
Summary
Fiber optical parametric amplification enhances laser scanning microscopy. This technique boosts low-power signals for sensitive near-infrared detection, improving imaging depth and speed.
Area of Science:
- Biomedical Optics
- Microscopy Technology
- Photonics
Background:
- Laser scanning microscopy performance relies on point detectors.
- Deeper tissue imaging requires sensitive detectors at near-infrared wavelengths.
- Current detectors face limitations in sensitivity, bandwidth, and dynamic range.
Purpose of the Study:
- To investigate fiber optical parametric amplification (FOPA) for boosting microscopy signals.
- To develop FOPA systems for sensitive near-infrared detection.
- To enhance laser scanning microscopy performance for deeper tissue penetration.
Main Methods:
- Constructed fiber optical parametric amplifiers with >50 dB gain at near-infrared wavelengths.
- Evaluated amplifier sensitivity, bandwidth, and dynamic range.
- Compared FOPA detection with conventional photodiode and electrical amplification.
- Demonstrated amplifier performance in diagnostic imaging experiments.
Main Results:
- FOPA achieved >50 dB parametric gain in the third near-infrared transparency window.
- Amplifiers exhibited sensitivity comparable to near-infrared photomultiplier tubes.
- FOPA provided a 10-100 fold sensitivity improvement over electrical amplification.
- Demonstrated amplifier bandwidths up to ~1.6 GHz, 10x faster than conventional detectors.
- Achieved ~8 nW sensitivity (~20 photons/pixel).
Conclusions:
- Fiber optical parametric amplification offers a novel approach for laser scanning microscopy.
- FOPA enables high-sensitivity detection at near-infrared wavelengths, improving imaging.
- This technology extends the capabilities of laser scanning microscopes for deeper tissue imaging.

