679  W high-power white supercontinuum all-fiber laser source

Abstract

We present a high-power white supercontinuum (SC) all-fiber laser source with average power of 67.9 W, spectrum ranging from 500 to 1700 nm, and spectral width exceeding 1000 nm for spectrum with flatness below 10 dB (except pump wavelength). Also, the visible waveband power (below 850 nm) occupies about 21% of the total SC power. A 145 W high-power picosecond pulse fiber laser is specially designed with high repetition frequency of 656 MHz to reduce nonlinear effects. Meanwhile, a homemade high-power mode field adaptor that can operate stably at hundreds of watts of pulse power has high coupling efficiency of 82%. To our knowledge, the 67.9 W white SC fiber laser source we achieved is the highest reported with such a wide and flat optical spectrum.

Numerical investigation of a wideband supercontinuum source based on a large-mode-area photonic crystal fiber pumped at 1.3 μm

“…In 2014, a supercontinuum covering from 900 nm to 1900 nm was recorded by pumping an all-normal dispersion (ANDi) PCF with a 1360 nm femtosecond laser [36]. In 2016, Sun et al used a 976 nm picosecond laser to pump a 5 m long PCF, obtaining a spectrum from 500 nm to 1700 nm [37]. In 2018, Ferhat et al designed a silica-core PCF with normal dispersion in the range of 1000-2000 nm, and numerically simulated supercontinuum generation from 1100 nm to 1700 nm and from 1210 nm to 2400 nm, pumped at 1.3 and 1.65 µm respectively [13].…”

High Power All-Fiber Supercontinuum System Based on Graded-Index Multimode Fibers

“…The dynamic of nonlinearity effects based on the generation of supercontinuum by picosecond and femtosecond lasers have been well explained [5]. The average power of PCF-based generation of supercontinuum has been reported to be higher than 200 W [6], however, the small core diameters of PCFs make it difficult to further increase its average power [7]. The splicing of photonic crystal fibers with other fibers is also a challenge, which usually requires a mode field adaptor to match the different cores [8].…”