Furukawa Denshi Co.

Tokyo, Japan

Furukawa Denshi Co.

Tokyo, Japan
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Cheng T.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | Nagasaka K.,Toyota Technological Institute | Tuan T.H.,Toyota Technological Institute | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

We experimentally investigate mid-infrared (MIR) supercontinuum (SC) generation in chalcogenide step-index optical fibers. The pump source is generated by the difference frequency generation with a pulse width of ∼170 fs, a repetition rate of ∼1000 Hz, and a wavelength range tunable from 2.5 to 11 μm. The wide MIR SC will be applied in sensing, medical and biological imaging areas. © 2017 SPIE.


Cheng T.,Toyota Technological Institute | Nagasaka K.,Toyota Technological Institute | Tuan T.H.,Toyota Technological Institute | Xue X.,Toyota Technological Institute | And 4 more authors.
Optics Letters | Year: 2016

We experimentally demonstrate mid-infrared (MIR) supercontinuum (SC) generation spanning ∼2.0 to 15.1 μm in a 3 cm-long chalcogenide step-index fiber. The pump source is generated by the difference frequency generation with a pulse width of ∼170 fs, a repetition rate of ∼1000 Hz, and a wavelength range tunable from 2.4 to 11 μm. To the best of our knowledge, this is the broadest MIR SC generation observed so far in optical fibers. It facilitates fiber-based applications in sensing, medical, and biological imaging areas. © 2016 Optical Society of America.


Cheng T.,Toyota Technological Institute | Kanou Y.,Toyota Technological Institute | Asano K.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | And 5 more authors.
Applied Physics Letters | Year: 2014

A hybrid four-hole AsSe2-As2S5 microstructured optical fiber (MOF) is fabricated by the rod-in-tube drawing technique. The core is made of AsSe2 glass and the cladding is made of As2S5 glass. The material refractive indices of the core and the cladding are ∼2.832 and ∼2.219 at the wavelength of ∼2.8 μm, respectively. The calculated zero-dispersion wavelength of the AsSe2-As2S5 MOF is 2.759 μm. Soliton self-frequency shift with a soliton central wavelength from 2.986 to 3.419 μm is observed when the AsSe2-As2S5 MOF is pumped by an optical parametric oscillator at the pump wavelength of ∼2.8 μm. At the same time a blue-shift dispersive wave is emitted by the soliton. © 2014 AIP Publishing LLC.


Cheng T.,Toyota Technological Institute | Usaki R.,Toyota Technological Institute | Duan Z.,Toyota Technological Institute | Gao W.,Toyota Technological Institute | And 7 more authors.
Optics Express | Year: 2014

Soliton self-frequency shift (SSFS) and third-harmonic generation (THG) are observed in a four-hole As2S5 chalcogenide microstructured optical fiber (MOF). The As2S5 MOF is tapered to offer an ideal environment for SSFS. After tapering, the zero-dispersion wavelength (ZDW) shifts from 2.02 to 1.61 μm, and the rate of SSFS can be enhanced by increasing the energy density of the pulse. By varying the average input power from 220 to 340 mW, SSFS of a soliton central wavelength from 2.206 to 2.600 μm in the mid-infrared is observed in the tapered segment, and THG at 632 nm is observed in the untapered segment. © 2014 Optical Society of America.


Cheng T.,Toyota Technological Institute | Kanou Y.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | Xue X.,Toyota Technological Institute | And 4 more authors.
Optics Express | Year: 2014

A hybrid four-hole AsSe2-As2S5 microstructured optical fiber (MOF) with a large refractive index difference is fabricated by the rod-intube drawing technique. The core and the cladding are made from the AsSe2 glass and As2S5 glass, respectively. The propagation loss is ∼1.8 dB/m and the nonlinear coefficient is ∼2.03 × 104 km-1W-1at 2000 nm. Raman scattering is observed in the normal dispersion regime when the fiber is pumped by a 2 μm mode-locked picosecond fiber laser. Additionally, soliton is generated in the anomalous dispersion regime when the fiber is pumped by an optical parametric oscillator (OPO) at the pump wavelength of ∼3000 nm. © 2014 Optical Society of America.


Cheng T.,Toyota Technological Institute | Kanou Y.,Toyota Technological Institute | Xue X.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | And 4 more authors.
Optics Express | Year: 2014

A novel AsSe2-As2S5hybrid MOF (HMOF) is designed and fabricated by the rod-in-tube drawing technique. The core is made from AsSe2glass and the cladding is made from As2S5glass. The loss is ∼1.2 dB/m at ∼3000 nm. Zero dispersion wavelength (ZDW) of the HMOF is ∼3380 nm. Supercontinuum (SC) generation in a 2 cm-long HMOF is investigated with the pump wavelengths of ∼3062, 3241 and 3389 nm from a tunable optical parametric oscillator (OPO) system. Broadband mid-infrared (MIR) SC generation with the spectrum from ∼1256 to 5400 nm is obtained with the peak power of ∼1337 kW at the wavelength of ∼3389 nm. © 2014 Optical Society of America.


Cheng T.,Toyota Technological Institute | Gao W.,Toyota Technological Institute | Kawashima H.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | And 5 more authors.
Optics Letters | Year: 2014

When a chalcogenide-tellurite hybrid optical fiber with a high refractive index difference ?n 0.24 is pumped by an optical parametric oscillator with a pump wavelength from 1700 to 3000 nm, widely tunable second-harmonic generation (SHG) from 850 to 1502 nm is obtained. The observation of SHG is primarily due to the surface nonlinearity polarization at the core-cladding interface and the second-harmonic signal remains stable at the maximal level throughout the laser pulse irradiation. © 2014 Optical Society of America.


Cheng T.,Toyota Technological Institute | Gao W.,Toyota Technological Institute | Liao M.,Toyota Technological Institute | Duan Z.,Toyota Technological Institute | And 5 more authors.
Optics Letters | Year: 2014

Achalcogenide-tellurite hybrid optical fiber with a step-index structure is fabricated by the rod-in-tube drawing technique. The core ismadeof 15Ge-3Ga-12Sb-70S (mol.%)glass, and the cladding ismadeof 78TeO 2-5ZnO-12Li2O-5Bi2O3 (mol. %) glass. The refractive index difference Δn = 0.24. Tunable third-harmonic generation from 568 to 869 nm is observed when the optical fiber is pumped by an optical parametric oscillator with the pump wavelength changing from 1700 to 2600 nm. © 2014 Optical Society of America.


Cheng T.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | Xue X.,Toyota Technological Institute | Matsumoto M.,Furukawa Denshi Co. | And 3 more authors.
Applied Optics | Year: 2015

We designed and fabricated a tellurite (76.5TeO2-6Bi2O3-11.5Li2O-6ZnO, mol. %) microstructured optical fiber (TMOF) with four air holes for widely tunable third-harmonic generation (THG). The loss of the TMOF is ∼0.2 dB/m at 1550 nm. Widely tunable THG from ∼567 to 902 nm is obtained when the TMOF is pumped by an optical parametric oscillator with the pump wavelength changing from ∼1700 to 2700 nm. The mechanism of THG in this work is further investigated through the third-harmonic signal pattern, which is due to the high nonlinearity of the TMOFand the high pump power, not from the phasematching process between the fundamental mode and the high-order TH mode. © 2015 Optical Society of America.


Cheng T.,Toyota Technological Institute | Kawashima H.,Toyota Technological Institute | Xue X.,Toyota Technological Institute | Deng D.,Toyota Technological Institute | And 4 more authors.
Journal of Lightwave Technology | Year: 2015

A chalcogenide-tellurite hybrid microstructured optical fiber is designed and fabricated by the rod-in-tube drawing technique. The core is made of chalcogenide glass with a composition of 15Ge-3Ga-12Sb-70S (atm%, GGSS) and the cladding is made of tellurite glass with a composition of 78TeO2-5ZnO-12Li2O-5Bi2O3 (mol%, TZLB). The loss is ∼1.1 dB/m at ∼2.0 μm. Zero dispersion wavelength of the HMOF is shifted down to ∼2370 nm from GGSS material dispersion ∼4600 nm. Supercontinuum (SC) generation is investigated by pumping a 1-cm-long HMOF with the wavelengths of ∼2000, 2300, and 2600 nm from a tunable optical parametric amplifier system. Flattened and broadband SC generation from ∼950 to 3350 nm with the intensity flatness of 6 dB bandwidth is obtained with the peak power of ∼40 MW at the wavelength of ∼2300 nm. © 2014 IEEE.

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