Abstract:A mid-infrared (MIR) supercontinuum (SC) has been demonstrated in a low-loss telluride glass fiber. The doublecladding fiber, fabricated using a novel extrusion method, exhibits excellent transmission at 8-14 μm: < 10 dB/m in the range of 8-13.5 μm and 6 dB/m at 11 μm. Launched intense ultrashort pulsed with a central wavelength of 7 μm, the step-index fiber generates a MIR SC spanning from ß2.0 μm to 16 μm, for a 40-dB spectral flatness. This is a fresh experimental demonstration to reveal that telluride gla… Show more
“…This might associated with the phonon energy of Sb-O is lager than that of Sb-S. Hence, purification technology 26,27 should be applied to eliminate impurities in optics. In addition, the transmittance of glasses would increase with the addition of AgI, which is in accordance with phenomenon in Ge-Ga-S-AgCl system 28 .Figure 3( a ) Vis/NIR and ( b ) IR transmission spectra on Series A (100– x )(0.2Ga 2 S 3 -0.8Sb 2 S 3 )- x AgI: where x = 10, 30, and 60, respectively.…”
Novel glasses in a Ga2S3-Sb2S3-AgI system were prepared with a melt-quenching method, and their glass-forming region was identified. The maximum dissolvable AgI in glasses was 65 mol%. The thermal, optical, and structural properties of glasses were investigated as a function of AgI and Ga2S3 contents. The Ga2S3-Sb2S3-AgI glasses possess a wide region of transmission window (0.65−14 μm). An ionic conductivity of approximately 1.01 × 10−3 S/cm can be obtained for a 40 (0.8Sb2S3-0.2Ga2S3)-60AgI glass at an ambient temperature, and the ionic conductivity increased as temperature increased. The relative activation energy of Ag+ conduction was also calculated. These novel glasses show potential for the combined application of infrared optics and solid electrolytes.
“…This might associated with the phonon energy of Sb-O is lager than that of Sb-S. Hence, purification technology 26,27 should be applied to eliminate impurities in optics. In addition, the transmittance of glasses would increase with the addition of AgI, which is in accordance with phenomenon in Ge-Ga-S-AgCl system 28 .Figure 3( a ) Vis/NIR and ( b ) IR transmission spectra on Series A (100– x )(0.2Ga 2 S 3 -0.8Sb 2 S 3 )- x AgI: where x = 10, 30, and 60, respectively.…”
Novel glasses in a Ga2S3-Sb2S3-AgI system were prepared with a melt-quenching method, and their glass-forming region was identified. The maximum dissolvable AgI in glasses was 65 mol%. The thermal, optical, and structural properties of glasses were investigated as a function of AgI and Ga2S3 contents. The Ga2S3-Sb2S3-AgI glasses possess a wide region of transmission window (0.65−14 μm). An ionic conductivity of approximately 1.01 × 10−3 S/cm can be obtained for a 40 (0.8Sb2S3-0.2Ga2S3)-60AgI glass at an ambient temperature, and the ionic conductivity increased as temperature increased. The relative activation energy of Ag+ conduction was also calculated. These novel glasses show potential for the combined application of infrared optics and solid electrolytes.
“…Yu et al pumped a Ge–As–Se step‐index fiber with a 4.0 μm femtosecond laser and obtained 1.8–10 μm SC spectrum . Zhao et al reported 2–16 μm SC spectrum generation in a Ge–Te–AgI double‐cladding fiber by pumping with a 7.0 μm femtosecond laser, which was the widest SC spectrum obtained using step‐index chalcogenide fibers . However, the preparation method with twice extrusions was extremely complicated.…”
Mid‐infrared (MIR) band supercontinuum (SC) light source has highly important application prospects in aerospace, biomedicine, MIR sensing, and pollutant monitoring. As–Se–Te glass has high nonlinear refractive index, wide MIR transmission range and weak crystallization ability. As40Se40Te20 glass fiber is suitable for producing wide MIR–SC spectrum. In this study, purified As40Se40Te20 glass was prepared and unclad and step‐index fibers were drawn. An unclad As40Se40Te20 glass fiber with minimum loss of 1.7 dB/m at 8.8 μm was obtained. By pumping the unclad fiber in the normal dispersion region at 5 μm, we recorded the broadest SC generation spectrum, which covered 1.8–13 μm with a 30 dB spectral flatness, from a fiber with 15 cm length. Besides, As40Se40Te20/As40Se42Te18 step‐index fiber with minimum loss of 5.6 dB/m at 5 μm was drawn from isolation extruded preform. The step‐index fiber was pumped in the normal dispersion region at 5 μm, and the SC spectrum, covering 2.1–11.2 μm with a 40 dB spectral flatness, was recorded from a fiber with 15 cm length. The SC spectrum, which was achieved by pumping the As40Se40Te20 fiber, covered almost all the transparent range of material.
“…These light sources are often based on ultra-broadband nonlinear spectral conversion in fluoride, tellurite, and chalcogenide glass (ChG) fibers [1][2][3][4]. Among different glass compositions, the ChGs have the highest nonlinearity and the broadest transparency ranges which allow operating at wavelengths where fluoride and tellurite glasses cannot be transparent [1].…”
Section: Introductionmentioning
confidence: 99%
“…Among different glass compositions, the ChGs have the highest nonlinearity and the broadest transparency ranges which allow operating at wavelengths where fluoride and tellurite glasses cannot be transparent [1]. To date, the broadest SC demonstrated in ChG fibers extends from ~2 to 16 μm [4]. It is well-known that not only the nonlinearity and transparency range impact on spectral broadening; the zerodispersion wavelength (ZDW) location with respect to a central pump wavelength is also of great importance for SC width [5,6].…”
Highlights:As-Se tapered suspended-core fibers were designed for mid-IR SC generation. Parameters of the produced fibers were studied experimentally and numerically. SC in the 1-10 μm range with 150-fs 100-pJ pump at 2 μm was obtained numerically. Experiments on spectral broadening of pump pulses at 1.57 μm were performed.
AbstractWe designed and developed tapered suspended-core fibers of high-purity As 39 Se 61 glass for supercontinuum generation in the mid-IR with a standard fiber laser pump source at 2 μm. It was shown that microstructuring allows shifting a zero dispersion wavelength to the range shorter than 2 μm in the fiber waist with a core diameter of about 1 μm. In this case, supercontinuum generation in the 1-10 μm range was obtained numerically with 150-fs 100-pJ pump pulses at 2 μm. We also performed experiments on wavelength conversion of ultrashort optical pulses at 1.57 μm from Er: fiber laser system in the manufactured As-Se tapered fibers. The measured broadening spectra were in a good agreement with the ones simulated numerically.
IntroductionThe mid-infrared (IR) supercontinuum (SC) laser sources have important applications in both basic science and industry. These light sources are often based on ultra-broadband nonlinear spectral conversion in fluoride, tellurite, and chalcogenide glass (ChG) fibers [1][2][3][4]. Among different glass compositions, the ChGs have the highest nonlinearity and the broadest transparency ranges which allow operating at wavelengths where fluoride and tellurite glasses cannot be transparent [1]. To date, the broadest SC demonstrated in ChG fibers extends from ~2 to 16 μm [4]. It is well-known that not only the nonlinearity and transparency range impact on spectral broadening; the zerodispersion wavelength (ZDW) location with respect to a central pump wavelength is also of great importance for SC width [5,6]. Operation in the anomalous dispersion regime often allows obtaining a broader spectrum in comparison with normal dispersion. In this pumping scheme, SC generation is dominated by the soliton dynamics. To generate ultra-broadband SC in solid step-index ChG fibers having ZDW near the material ZDW (which is significantly beyond 4 μm, for example, 4.81 μm for As 2 S 3 , 7.5 μm for As 2 Se 3 , and >7.5 μm for Te-based ChG [1]), mid-IR optical parametric oscillators and amplifiers have been employed [7,8]. However, if it is desirable to use a pump source at shorter wavelengths than material ZDW, microstructured or/and tapered fibers with blue-shifted ZDW can be implemented. Suspended-core fiber (SCF) geometry is widespread for dispersion management. So, SC spanning 1.7-7.5 μm has been obtained in As-Se SCF with ZDW of 3.5 μm pumped at 4.4 μm [9]. In this paper, the design, development, and manufacturing of tapered SCF with a thin waist core diameter of about 1 μm of the high-purity As-Se glass are reported. The As-Se glass has a broad spectral transparency range (0.85-17.5 μm for absorption coefficient level of 1 cm
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