Mid-infrared supercontinuum generation in soft-glass suspended core photonic crystal fiber

Abstract

Supercontinuum from 800 to 2,600 nm has been obtained in a soft glass suspendedcore photonic crystal fiber. The fiber has been fabricated using an in-house synthesized, lead-bismuth-galate oxide glass (PBG-08), which has a transmission window from 500 nm to 4,500 nm. Dispersion characteristic has been designed to enable efficient pumping in the anomalous regime, using typical telecommunication wavelengths and influence of discrepancy between design and physical dispersion profile of fiber is discussed. An optical parametric amplifier system seeded with a Ti:Sapphire oscillator has been used as a light source (70 fs pulses with 100 kHz repetition rate). Supercontinuum bandwidth on the midinfrared side is limited by OH − absorption of the glass and presence of second zero-dispersion wavelength in the spectral area of interest. Flatness the spectrum remains under 7 dB from roughly 1,800 nm to about 2,500 nm.

Supercontinuum generation in microstructured fibers made of heavy metal oxide glass

“…Nevertheless, experimentally recorded supercontinuum spectrum -shown in Fig. 3b -under pumping with 70 fs pulses at 1550 nm reached a wavelength of 2600 nm for fiber sample length of just 5.5 cm [7].…”

“…(a) (b) Figure 3: (a) SEM images of photonic structure of the developed suspended core photonic crystal fiber using PBG-08 glass; (b) Measured supercontinuum spectrum in the fiber [7].…”

Supercontinuum generation in dispersion-varying microstructured optical fibers

“…Solitons undergo Raman-induced frequency shift (RIFS) towards the longer ZDW soon after the fission and amplify dispersive wave (DW) generated across the longer ZDW by the phase matching condition. In [18], Klimczak et al experimentally demonstrated SC spreading from 0.8 μm to 2.6 μm by pumping in the anomalous dispersion region in a dispersion engineered lead-bismuth-galate oxide glass micronstructured fiber. Recently, nonuniform waveguides with continuously varying dispersion profiles have been designed to generate SC with wider bandwidth [9,11,14,19].…”

Electromagnetic Modeling of Third-Order Nonlinearities in Photonic Crystal Fibers Using a Vector Two-Dimensional FDTD Algorithm

“…Second, the pumping signal should be well confined in a small area in order to produce high power density with available pulse laser sources, which in turn magnify nonlinear effects. The aforementioned PCFs allow achieving energy density at the level well over 10 nJ/μm 2 [4], [5]. And last but not least, various effects that contribute to supercontinuum generation, such as self-phase modulation, soliton fission, Raman scattering or four-wave mixing, require appropriate spectral shape of mode dispersion, which can be controlled by the adjustment of photonic crystal cladding.…”