Hollow-core Fiber Research Articles

Efficient Soliton Spectral Shifting in the 1-km Long Hollow Core Fiber With Nested Capillaries

Efficient Soliton Spectral Shifting in the 1-km Long Hollow Core Fiber With Nested Capillaries

Highly Sensitive Ultrasonic Sensor Using Anti-Resonant Reflection Optical Waveguide Mechanism in a Hollow-Core Fiber

Highly Sensitive Ultrasonic Sensor Using Anti-Resonant Reflection Optical Waveguide Mechanism in a Hollow-Core Fiber

Enhanced Inhibited Mode-Coupling: Multi-Mode Hollow-Core Anti-Resonant Fiber Designs

Enhanced Inhibited Mode-Coupling: Multi-Mode Hollow-Core Anti-Resonant Fiber Designs

Accurate Loss Prediction of Realistic Hollow-Core Anti-Resonant Fibers Using Machine Learning

Accurate Loss Prediction of Realistic Hollow-Core Anti-Resonant Fibers Using Machine Learning

Spectral Bandwidth Tuning of Photoionization-Induced Blue-Shifted Solitons in gas-Filled Hollow-Core Anti-Resonant Fibers

Spectral Bandwidth Tuning of Photoionization-Induced Blue-Shifted Solitons in gas-Filled Hollow-Core Anti-Resonant Fibers

Hollow-Core Fiber for Single-Mode, Low Loss Transmission of Broadband UV Light

Hollow-Core Fiber for Single-Mode, Low Loss Transmission of Broadband UV Light

Advancing High-Power Hollow-Core Fiber Pulse Compression

Advancing High-Power Hollow-Core Fiber Pulse Compression

End-Capping Hollow-Core Fibers With Suppressed Coupling Into Higher-Order Modes

End-Capping Hollow-Core Fibers With Suppressed Coupling Into Higher-Order Modes

Semi-Empirical Model for Calculating Birefringence and Confinement Loss in Bi-Thickness Fourfold Anti-Resonant Hollow-Core Fiber

Semi-Empirical Model for Calculating Birefringence and Confinement Loss in Bi-Thickness Fourfold Anti-Resonant Hollow-Core Fiber

Spectral Broadening and Pulse Compression in Molecular Gas-Filled Hollow-Core Fibers

Spectral Broadening and Pulse Compression in Molecular Gas-Filled Hollow-Core Fibers

Flying Particle Thermosensor in Hollow-Core Fiber Based on Fluorescence Lifetime Measurements

Flying Particle Thermosensor in Hollow-Core Fiber Based on Fluorescence Lifetime Measurements

High Fidelity Distribution of Telecom Polarization Entangled Photons through a 7.7 Km Antiresonant Hollow-Core Fiber

High Fidelity Distribution of Telecom Polarization Entangled Photons through a 7.7 Km Antiresonant Hollow-Core Fiber

Synthesizing gas-filled anti-resonant hollow-core fiber Raman lines enables access to the molecular fingerprint region

The synthesis of multiple narrow optical spectral lines, precisely and independently tuned across the near- to mid-infrared region, is a pivotal research area that enables selective and real-time detection of trace gas species within complex gas mixtures. However, existing methods for developing such light sources suffer from limited flexibility and very low pulse energy, particularly in the mid-infrared domain. Here, we introduce a concept that is based on the combination of an appropriate design of near-infrared fiber laser pump and cascaded configuration of gas-filled anti-resonant hollow-core fiber technology. This concept enables the synthesis of multiple independently tunable spectral lines, with >1 μJ high pulse energies and a few nanoseconds pulse width in the near- and mid-infrared regions. The number and wavelengths of the generated spectral lines can be dynamically reconfigured. A proof-of-concept laser beam synthesized of two narrow spectral lines at 3.99 µm and 4.25 µm wavelengths is demonstrated and combined with photoacoustic modality for real-time SO2 and CO2 detection. The proposed concept also constitutes a promising way for infrared multispectral microscopic imaging.

Tunable Fiber Gas Raman Laser of 6 W at 2.9 μm by Deuterium-Filled Hollow-Core Fiber

Tunable Fiber Gas Raman Laser of 6 W at 2.9 μm by Deuterium-Filled Hollow-Core Fiber

A Hollow-Core Fiber Based Stand-Alone Multimodal (2-Photon, 3-Photon, SHG, THG) Nonlinear Flexible Imaging Endoscope System

A Hollow-Core Fiber Based Stand-Alone Multimodal (2-Photon, 3-Photon, SHG, THG) Nonlinear Flexible Imaging Endoscope System

Fiber Gas Amplifier in CO2-Filled Hollow-Core Fiber and its Self-Absorption Phenomenon

Fiber Gas Amplifier in CO₂-Filled Hollow-Core Fiber and its Self-Absorption Phenomenon

Mid-Infrared Lasers and Supercontinuum Sources Based on Stimulated Raman Scattering in Gas-Filled Hollow-Core Fibers

Mid-Infrared Lasers and Supercontinuum Sources Based on Stimulated Raman Scattering in Gas-Filled Hollow-Core Fibers

Suppression of Optical Fringes in Gas Spectroscopy Inside Anti-Resonant Hollow-Core Fibers by Fiber Bending

Suppression of Optical Fringes in Gas Spectroscopy Inside Anti-Resonant Hollow-Core Fibers by Fiber Bending

Mid-Infrared Pulsed Fiber Laser Source at 4.3 μm Based on a CO₂-Filled Anti-Resonant Hollow-Core Silica Fiber

Mid-Infrared Pulsed Fiber Laser Source at 4.3 μm Based on a CO₂-Filled Anti-Resonant Hollow-Core Silica Fiber

Speed of Light in Hollow-Core Photonic Bandgap Fiber Approaching That in Vacuum

A Fresnel mirror is introduced at a hollow-core photonic bandgap fiber end by fusion splicing a short single-mode fiber segment, to reflect the light backward to an optical frequency domain reflectometry. The backward Fresnel reflection is used as a probe light to achieve light speed measurement with a high resolution and a high signal-to-noise ratio. Thus, its group velocity is obtained with the round-trip time delay as well as the beat frequency at the reflection peak. Multiple Fresnel peaks are observed from 2180.00 Hz to 13,988.75 Hz, corresponding to fusion-spliced hollow-core fiber segments with different lengths from 0.2595 m to 1.6678 m, respectively. The speed of light in the air guidance is calculated at 2.9753 × 108 m/s, approaching that in vacuum, which is also in good agreement with 2.9672 × 108 m/s given by the numerical analysis with an uncertainty of 10−3. Our demonstration promises a key to hollow-core waveguide characterization for future wide-bandwidth and low-latency optical communication.