학술논문
From near-UV to long-wave infrared waveguides inscribed in barium fluoride using a femtosecond laser
Document Type
Article
Source
Optics Letters; August 2021, Vol. 46 Issue: 16 p3925-3928, 4p
Subject
Language
ISSN
01469592; 15394794
Abstract
Depressed-cladding waveguides (DCWs) of various sizes were inscribed in barium fluoride, allowing single-mode operation in the entirety of its transmission window (λ=0.2−12µm). Using femtosecond laser pulses at 515 nm, type I laser modified tracks were overlapped to form circular waveguides, whose cross-sectional geometry and numerical aperture were tailored to accommodate 0.405, 2.85, and 10.6 µm light. The mode profile, propagation loss, refractive index profile, and numerical aperture of the optimized waveguides were analyzed and compared with theory. We particularly demonstrate the challenging inscription of a large DCW for single-mode operation at 10.6 µm with propagation loss of <0.63dB/cm.