Generation of a frequency comb spanning more than 3.6 octaves from ultraviolet to mid infrared.
We have observed an ultra-broadband frequency comb with a wavelength range of at least 0.35 to 4.4 μm in a ridge-waveguide-type periodically poled lithium niobate device. The PPLN waveguide is pumped by a 1.0-2.4 μm wide frequency comb with an average power of 120 mW generated using an erbium-based mode-locked fiber laser and a following highly nonlinear fiber. The coherence of the extended comb is confirmed in both the visible (around 633 nm) and the mid-infrared regions.
Kana
K
Iwakuni
Sho
S
Okubo
Osamu
O
Tadanaga
Hajime
H
Inaba
Atsushi
A
Onae
Feng-Lei
FL
Hong
Hiroyuki
H
Sasada