Nonlinear optical properties of polycrystalline silicon-germanium core fibers from telecom wavelengths into the mid-infrared spectral region

Amar N. Ghosh; Meng Huang; Thomas W. Hawkins; John Ballato; Ursula J. Gibson; Anna C. Peacock

doi:10.1117/12.3017163

20 June 2024 Nonlinear optical properties of polycrystalline silicon-germanium core fibers from telecom wavelengths into the mid-infrared spectral region

Amar N. Ghosh, Meng Huang, Thomas W. Hawkins, John Ballato, Ursula J. Gibson, Anna C. Peacock

Author Affiliations +

Proceedings Volume 13004, Nonlinear Optics and its Applications 2024; 130040G (2024) https://doi.org/10.1117/12.3017163
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Polycrystalline silicon germanium (SiGe) core fibers offer great potential as flexible nonlinear platforms. Compared to Si core fibers, the SiGe material offers higher nonlinear coefficients, extended mid-infrared wavelength coverage, and the possibility to tune the bandgap and index of refraction through varying the Ge concentration. Here SiGe core fibers with 10% Ge were fabricated using the molten core drawing method, followed by CO₂ laser irradiation. The transmission properties of the fibers were subsequently improved further using a fiber tapering method, to tailor the core diameter and enhance the crystallinity. The resulting tapered SiGe fiber had linear losses of 2.17 dB cm^-1 at 1.5 μm and 4 dB cm^-1 at 2.5 μm, significantly lower than previous reports. Nonlinear characterization of the fibers reveals that the nonlinear coefficients are higher than standard Si core fibers, as expected due to the introduction of germanium. The significantly higher value of the nonlinear figure of merit calculated for the SiGe fiber for wavelengths above 2 μm indicates that this new fiber platform could find numerous applications in mid-infrared nonlinear photonics.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Amar N. Ghosh, Meng Huang, Thomas W. Hawkins, John Ballato, Ursula J. Gibson, and Anna C. Peacock "Nonlinear optical properties of polycrystalline silicon-germanium core fibers from telecom wavelengths into the mid-infrared spectral region", Proc. SPIE 13004, Nonlinear Optics and its Applications 2024, 130040G (20 June 2024); https://doi.org/10.1117/12.3017163

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available