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Updated: May 20, 2025
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements
Kristen M Parzuchowski1,2,3, Michael D Mazurek3,2, Charles H Camp4
1JILA, University of Colorado Boulder, Boulder, Colorado 80309, United States.
ACS Photonics
|March 24, 2025
Summary
We developed a new fiber platform for enhanced two-photon absorption measurements. This method significantly improves sensitivity for detecting classical and entangled two-photon absorption (C2PA and E2PA) processes.
Area of Science:
- Nonlinear optics
- Quantum optics
- Spectroscopy
Background:
- Two-photon absorption (TPA) is crucial for various applications.
- Entangled two-photon absorption (E2PA) offers potential quantum advantages but is challenging to measure.
- Recent studies suggest smaller E2PA cross-sections than previously reported.
Purpose of the Study:
- To develop a highly sensitive platform for TPA measurements.
- To investigate the feasibility of measuring E2PA in a low-photon-flux regime.
- To set experimental bounds on E2PA cross-sections.
Main Methods:
- A toluene-filled hollow-core fiber was used to confine light and sample.
- Classical two-photon absorption (C2PA) was measured with ultra-low laser power (1.75 nW).
- The first waveguide-based measurement of E2PA was performed.
Main Results:
- Achieved a 45-fold improvement in sensitivity for C2PA compared to free-space methods.
- Observed no evidence of E2PA within the experimental setup.
- Established an upper bound for the E2PA cross-section consistent with recent findings.
Conclusions:
- The fiber platform significantly enhances sensitivity for nonlinear optical measurements.
- Current experimental conditions do not support the observation of E2PA.
- The findings constrain E2PA cross-sections, impacting the understanding of quantum advantages in TPA.
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