Fabrication and Application of Small Core Chalcogenide Glass Fibers in Nonlinear Optics

doi:10.15541/jim20150229

Abstract

Abstract:

High purity Ge-As-Se and Ge-As-S chalcogenide glasses were synthesized by a dynamic distillation technique. Small-core step-index fibers with Ge-As-Se glass core and Ge-As-S glass cladding were fabricated through a two-step rod-in-tube approach. Supercontinuum generation was measured using a femtosecond laser as the pump. The impurities associated with C, H and O could be efficiently eliminated when Al and GaCl₃ were used as the oxygen getter and C/H scavenging agent, respectively. The as-fabricated GeAsSe/GeAsS fibers have a numerical aperture of ~1.3, and show good transmitting property in the 2-9 μm spectral range. When a 22 cm long fiber with a core diameter of 6 µm is pumped with 4.6 kW peak power and 320 fs pulses at a repetition rate of 10.5 MHz at 4.0 μm, supercontinuum spanning from ~1.9 to ~8.2 µm is generated with a dynamic range of ±10 dB and an average power of ~4.5 mW.

Key words: nonlinear optics, chalcogenide glass fibers, mid-infrared, supercontinuum generation

CLC Number:

TN213

GUO Wei, ZHANG Bin, ZHAI Cheng-Cheng, QI Si-Sheng, YU Yi, YANG An-Ping, LI Lei, YANG Zhi-Yong, WANG Rong-Ping, TANG Ding-Yuan, TAO Guang-Ming, LUTHER-DAVIES Barry. Fabrication and Application of Small Core Chalcogenide Glass Fibers in Nonlinear Optics[J]. Journal of Inorganic Materials, 2016, 31(2): 180-184.

Figures/Tables 5

Fig. 1 DSC curves of Ge11.5As24Se64.5 and Ge10As24S66 glasses

Fig. 2 (a) Transmission spectra of purified Ge11.5As24Se64.5 (4.0 mm) and Ge10As24S66 (5.3 mm) glasses and (b) Measured refractive indices of Ge11.5As24Se64.5 and Ge10As24S66 glasses 50×10-6 g/g Al and 200×10-6 g/g GaCl3 were used as the oxygen getter and C/H scavenging agents, respectively

Fig. 3 Losses of fabricated Ge-As-Se/Ge-As-S core/ cladding fiber

Fig. 4 GVD curve of the Ge-As-Se/Ge-As-S fiber with a core diameter of 6 μm

Fig. 5 Supercontinuum generated in a 22 cm long Ge-As-Se/ Ge-As-S fiber with a core diameter of 6 μm 320 fs pulses at 10.5 MHz repetition rate at 4.0 µm was coupled in the fiber, and the peak power was 4.6 kW

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