High-power visible-enhanced all-fiber supercontinuum generation in a seven-core photonic crystal fiber pumped at 1016  nm

Abstract

An 80 W 350-2400 nm monolithic supercontinuum (SC) source is reported. The high-power SC is generated in a uniform multi-core photonic crystal fiber (PCF) pumped by a 1016 nm pulsed fiber laser. The specially designed PCF has seven 4.5 μm diameter cores, a 0.85 air-filling fraction, and a zero dispersion wavelength (ZDW) of 991 nm. The 1016 nm pulsed laser delivers up to 114 W average power, which is believed to be the highest currently reported for picosecond fiber lasers working below 1020 nm. In order to ensure a robust and compact all-fiber structure, the pump laser is fusion spliced to the PCF using a selective air-hole collapse technique, achieving an ultra-low splicing loss of 0.2 dB despite the severe mode field mismatch. The proximity of the pump wavelength to the ZDW of PCF leads to enhanced visible generation. The output SC has a high spectral density of up to 108 mW/nm (at 580 nm) and over 50 mW/nm across the entire visible waveband. The achieved short-wavelength edge and high-spectral-power density in the visible region, to the best of our knowledge, are the best results reported for high-power visible SC sources.

NONLINEAR PROPERTIES OF STRUCTURAL HETEROGENEOUS PHOTONIC CRYSTAL FIBERS WITH As2Se3 SUBSTRATE

“…The high refractive index contrast between the core and cladding is strictly maintained to confine light in the core, which is the main mechanism for nonlinear effects. Silica PCFs are popular subjects of research because they exhibit numerous applications, such as optical communication (Kabir et al, 2020;Mohammadzadehasl & Noori, 2019), nonlinear optics (Park et al, 2020;Biswas et al, 2019), high power technology (Qi et al, 2018;Hasan et al, 2021), spectroscopy (Markin et al, 2017;Paul et al, 2020), and sensing applications such as gas sensing (Paul et al, 2018;Kaur & Singh, 2019) and chemical sensing (Podder et al, 2019;Eid et al, 2021) with its unique properties. Among them, supercontinuum (SC) generation (Lanh et al, 2019(Lanh et al, , 2020 has been widely studied, and outstanding results have been achieved in silica fiber.…”

All-Fiber High Power Supercontinuum Generation by Cascaded Photonic Crystal Fibers Ranging From 370 nm to 2400 nm

“…power of 215 W and a spectrum ranging from 480 nm to 2400 nm in 2018 [23]. In the same year, Qi Xue et al acquired SC with an average power of 80W and a spectrum covering from 350 nm to 2400 nm by using a 7-core PCF pumped by 1018 nm picosecond pulse [24].…”

“…Firstly, in order to generate SC covering the full visible range, it is necessary to shift the ZDW of PCF as short as possible. For example, in the literature [10], [24], The ZDW of PCF are 780 nm and 910 nm respectively. Secondly, in order to match the ZDW of PCF, the pump wavelength is also moved to the short-wave direction, so that the dispersion wave can be captured by the long wave soliton generated by the Raman effect.…”

All-fiber high-power linearly polarized supercontinuum generation from polarization-maintaining photonic crystal fibers

“…Owing to the low nonlinear coefficient and the difficulty in controlling the dispersion properties of conventional fibers, the spectrum is broadened only from 850 nm to 1900 nm. To further broaden the spectrum, highly nonlinear fibers such as PCFs have been widely used in broadband SC generation for their excellent characteristics, such as high nonlinearity and tailorable dispersion [19,20] . Therefore, another effective way for obtaining a linearly polarized SC is using highly birefringent PCFs [21][22][23][24][25][26] .…”