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Characterizing hollow-core fiber surface roughness with large dynamic range and picometer-resolution profilometry.

Ali Al Dhaybi¹, Jonas H Osório^1,2, Foued Amrani³

¹GPPMM Group, Xlim Research Institute, 123 Avenue Albert Thomas, Lim s 87060, France.

The Review of Scientific Instruments

|May 19, 2025

Summary

This summary is machine-generated.

We developed a picometer-resolution optical profilometer to measure surface roughness in hollow-core photonic crystal fibers (HCPCFs). This device offers high sensitivity and a large dynamic range, crucial for advancing HCPCF technology.

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Area of Science:

Photonics
Materials Science
Optical Engineering

Background:

Hollow-core photonic crystal fibers (HCPCFs) are critical for advanced optical applications.
Accurate characterization of HCPCF surface roughness is essential for optimizing their performance.
Existing methods may lack the resolution or dynamic range for comprehensive surface analysis.

Purpose of the Study:

To design and characterize a novel optical profilometer.
To achieve picometer resolution and a large dynamic range for surface roughness measurements.
To demonstrate the profilometer's applicability to HCPCF microstructure analysis.

Main Methods:

Development of a custom picometer-resolution optical profilometer.
Characterization of the profilometer's sensitivity and dynamic range.
Application of the profilometer to measure surface roughness within various HCPCF designs.

Main Results:

Achieved a sensitivity of 2 pm/√Hz.
Demonstrated a remarkable dynamic range of 1 cm.
Successfully measured surface roughness inside different HCPCF structures.

Conclusions:

The developed optical profilometer is validated for precise surface roughness assessment.
The device offers unprecedented resolution and dynamic range for HCPCF analysis.
This tool can be integrated into HCPCF development to enhance fabrication and performance.