Silica-based photonic crystal fiber infiltrated with 1,2-dibromoethane for supercontinuum generation

Abstract

This study proposes a photonic crystal fiber (PCF) made of fused silica glass with the core infiltrated with 1,2-dibromoethane ( C 2 H 4 B r 2 ) as a new source of supercontinuum light pulses. Due to the modifications of the PCF’s structure geometry, a number of computer simulations investigating their optimized structures has been carried out. This aimed at achieving flat near-zero dispersion and zero dispersion wavelength matching of the pump wavelength for efficient spectral broadening. Based on the obtained results, the structural geometries of two C 2 H 4 B r 2 -core PCFs were optimized using numerical modeling for broadband supercontinuum (SC) generation. The first fiber structure with a lattice constant 1.5 µm and filling factor 0.4 has all-normal dispersion profile. The SC with a broadened spectral bandwidth from 0.64 to 1.70 µm is generated by pump pulses centered at a wavelength of 1.03 µm, 120 fs duration, and energy of 1.5 nJ. The second proposed structure—with lattice constant 1.5 µm and filling factor 0.65—has anomalous dispersion for wavelengths longer than 1.03 µm. We obtained high coherence of the SC pulses in the anomalous dispersion range over wavelengths of 0.7–2.4 µm with the same pump pulse as the first fiber and with input energy of 0.09 nJ. These fibers would be interesting candidates for all-fiber SC sources operating with low-energy pump lasers as cost-effective alternatives to glass core fibers.

Design and Optimization of C6H5NO2‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power

“…In particular, the fiber #F 1 has an extended spectrum from 0.726 to 1.649 µm with a peak power of 133 W, while the fiber in Ref. [ 31 ] has an extended spectrum from 0.64 to 1.7 µm but uses 93 times more peak power than our work. PCF with an all‐normal dispersion regime in Ref.…”

“…[19,20] Recently, liquid-filled hollow-core fibers have been proposed as an attractive approach for SC generation because liquids exhibit high nonlinearity and high transparency. [19,[21][22][23][24][25][26][27][28][29][30][31][32][33] Table 1 gives a brief summary of the results achieved with liquid core PCFs in recent years. Previously reported hollow-core PCFs showed excellent dispersion control and improved nonlinearity, as well as peak performance for generating wide SCs.…”

“…In most of the works above (Table 1), the diameters of the air holes in the cladding are the same size, so only the dispersion can be optimized in the PCF structure, but not the effective mode area and the attenuation. [27][28][29][30][31][32][33] Most recently, Ref. [34] reported a PCF with a toluene-core (C 7 H 8 -core) with a circular lattice of SCG.…”

“…In most of the works above (Table 1), the diameters of the air holes in the cladding are the same size, so only the dispersion can be optimized in the PCF structure, but not the effective mode area and the attenuation. [ 27–33 ]…”

Modeling of lead-bismuth gallate glass ultra-flatted normal dispersion photonic crystal fiber infiltrated with tetrachloroethylene for high coherence mid-infrared supercontinuum generation

“…Recently, the incorporation of liquids into the air-holes of PCFs has been considered as post-processing to optimize fiber properties for more practical applications of SC generation [36][37][38][39][40]. Liquids with high nonlinearity properties and high transparency are filled into a hollow-core fiber for generating broad SC spectral with low input peak power [36,37]. Other works have considered solid core PCFs with cladding air-holes infiltrated with liquids to modify the fiber dispersion for SC generation purposes [38,39].…”