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Abstract
We report on characterization of a large solid core, photonic crystal fiber dedicated to broadband transmission range from visible to mid-infrared. We have fabricated a multi-mode photonic crystal fiber, made of a heavy metal-oxide glass based on the $$\hbox {PbO}{-}\hbox {Bi}_{2}\hbox {O}_{3}{-}\hbox {Ga}_{2}\hbox {O}_{3}$$ system, modified with $$\hbox {SiO}_{2}$$ and CdO, synthesized in-house, which shows good transmission up to $$4.5\,\upmu \hbox {m}$$ , as well as good rheological properties that permit multiple thermal processing steps without crystallization. The core of the fiber is created by replacement of central 60 tubes with solid rods. The photonic cladding is composed of 8 rings of air holes with a filling factor of 0.42. Simulation results shows that the fiber can be used for broadband transmission in the range of 430–3,000 nm. Calculated effective mode area of the fiber is $$295\,\upmu \hbox {m}^{2}$$ . We have measured attenuation of the fiber in the range 800–1,700 nm and its sensitivity to bending losses. Attenuation ranges from 1 to 4 dB/m in the considered range and bending losses are below 0.7 dB.
Highlights
In the last several years, large mode area (LMA) photonic crystal fibers (PCFs) have attracted a significant increase of attention from the research community
In this paper we present a LMA PCF made of heavy metal oxide glass, dedicated to broadband guidance in the visible, near- and, in part, mid-infrared region with limited number of guided modes
Two microscope objectives—10x/0.25 and 20x/0.40 mounted on high precision translation stages were user for coupling light into tested PCFs and decoupling light, respectively
Summary
In the last several years, large mode area (LMA) photonic crystal fibers (PCFs) have attracted a significant increase of attention from the research community. It is difficult to enlarge the effective mode area for broadband applications, because of the trade-off relationship between the cut-off wavelength and bending loss To overcome this bottleneck Poli et al considered a LMA PCF with a core with 19lattice-cell defect (Poli et al 2011). Increasing number of MidIR sources and the demands of ulrabroadband spectroscopy and sensing, create a need for the development of new LMA PCFs, which can transmit in the MidIR region (Waynant et al 2001) and have low bending losses, with good mechanical properties and high resistance to laser damage To meet those needs, various soft glasses, such as chalcogenide, tellurite or heavy metal oxide glasses, can be used. In this paper we present a LMA PCF made of heavy metal oxide glass, dedicated to broadband guidance in the visible, near- and, in part, mid-infrared region with limited number of guided modes
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