Highly coherent supercontinuum generation in a tellurite all-solid hybrid microstructured fiber pumped at 2 μm

Abstract

We experimentally demonstrate supercontinuum generation in a tellurite all-solid hybrid microstructured fiber. The fiber, which has a solid core surrounded by six solid rods, possesses a flattened normal chromatic dispersion of −15 ± 5 ps km nm−1 from 2 to 4 μm. Pumped with a femtosecond laser at 2 μm, a highly coherent SC spanning from 1.2 to 3.3 μm at −20 dB level is generated in a 5 cm long fiber.

Supercontinuum generation in photonic crystal fibers infiltrated with tetrachloroethylene

“…A number of techniques have been proposed for the generation of SC in which the high nonlinearities and low dispersion profiles play important roles. A typical approach for this purpose is utilizing photonic crystal fibers (PCFs) made of silica or highly nonlinear soft glasses (Dudley et al 2006;Dai et al 2018;Nguyen et al 2019;Klimczak et al 2019;Buczynski et al 2010). Silica fibers work efficiently for SC generations from the visible to the near-infrared (IR) range, but not for the mid-IR range due to their limited transmission bandwidth (Dudley et al 2006).…”

“…Although the nonlinear coefficient of the silica-core PCFs can be enhanced by reducing its effective core area, this approach will lead to difficulties in light coupling. A second common approach is to use highly nonlinear soft glass materials such as chalcogenide (Dai et al 2018), tellurite (Nguyen et al 2019;Klimczak et al 2019) or lead-bismuth-gallate glass (Buczynski et al 2010). However, these fibers are incompatible with silica for fusion splicing, limited in power handling, and usually require complex pump systems.…”

All-fiber ultrafast amplifier at 1.9 μm based on thulium-doped normal dispersion fiber and LMA fiber compressor

“…The developed system generates radiation with random polarization and the pulse formation and amplification strongly depends on the PCs settings. The resulting source is a suitable for broadband coherent mid-IR supercontinuum generation in different nonlinear media 4,5 . Like all ultrafast fiber systems with non-polarization maintaining fibers, this system is highly sensitive to external influences (temperature, vibration, pressure, etc.).…”

“…Such systems are compact, reliable, easy to align, and environmentally stable when using polarization-maintaining fibers. Most of the aforementioned applications require a coherent supercontinuum in the mid-IR region that is conveniently achieved using ultrafast Tm-doped fiber lasers 4,5 . For the generation of broadband coherent supercontinua the nonlinear media with anomalous group-velocity dispersion (GVD) are desirable 4,6 .…”

Octave-spanning coherent supercontinuum generation in a step-index tellurite fiber and towards few-cycle pulse compression at 2 μm

“…In general, the exploitation of compact and robust fiber SC schemes with improved coherence and flatness could be advantageous for applications like absorption spectroscopy or pulse recompression [17][18], but still requires considerable efforts beyond 2 µm to reach the remarkable efficiency already demonstrated in the near-IR. To this regard, several experimental attempts have been already reported in the important spectral transition between near-IR and mid-IR (1.5-3.5 μm) [13,[19][20][21][22][23][24] by using normal dispersion fibers made of chalcogenide or tellurite glasses. Note that only Refs.…”