Design, fabrication, and characterization of dual-wavelength inhibited-coupling guiding hollow-core fibers
Year: 2025
Type: article
Abstract: The present paper reports on the design, fabrication, and characterization of an 8-tube inhibited-coupling guiding hollow-core photonic crystal fiber (IC-HCPCF) capable of guiding both the beam emitted from an Yb:YAG laser at the fundamental wavelength of $$\lambda =1030 \text{nm}$$ λ = 1030 nm and its second harmonic at $$\lambda =515 \text{nm}$$ λ = 515 nm . By controlling the strut thickness of the glass capillaries to approximately $$362 \text{nm}$$ 362 nm , the transmission of laser radiation at both wavelengths was possible with low losses. Optimizing the outer diameter of the glass capillaries mitigates the bending-induced increase of the confinement loss at the wavelength of $$515 \text{nm}$$ 515 nm without compromising the optical performance of the fiber at the wavelength of $$1030 \text{nm}$$ 1030 nm . Experimental results confirm the near to diffraction-limited beam quality $$\left({M}^{2}<1.15\right)$$ M 2 < 1.15 of the laser beams exiting the fiber at both operational wavelengths. Operating in the first transmission band at the wavelength of $$1030 \text{nm}$$ 1030 nm , the calculated chromatic dispersion is $$1.02 \text{ps}/(\text{nm}\bullet \text{km})$$ 1.02 ps / ( nm ∙ km ) , despite a diameter of the hollow core of $$40 \mu \text{m}$$ 40 μ m . At the wavelength of $$515 \text{nm}$$ 515 nm this value amounts to $$0.62 \text{ps}/(\text{nm}\bullet \text{km})$$ 0.62 ps / ( nm ∙ km ) . The measured losses are $$27.5\pm 0.3 \text{dB}/\text{km}$$ 27.5 ± 0.3 dB / km at the wavelength of $$515\text{ nm}$$ 515 nm and $$25.7\pm 0.7 \text{dB
Source: Applied Physics B
Institution: University of Stuttgart
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,090
OpenAlex ID: W4407962284