Investigation into nonlinear optical absorption property of CoSb3 skutterudite in the 2 μm spectral region

Lee, Jinho; Kim, Taeyoon

doi:10.1016/j.optlastec.2020.106274

Cited by 5 publications

(2 citation statements)

References 88 publications

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“…Two A g modes at ∼153.4 and ∼182.6 cm –1 can be observed, which are the longer (A g1 ) and shorter (A g2 ) Sb–Sb stretching vibrations of the Sb 4 rings in skutterudites, respectively. Meanwhile, the other three peaks at 106.7, 133.1, and 170.8 cm –1 can be identified as the optical phonon modes (2F g + E g ) of skutterudites. , Difference in the vibration modes among TGZM-Ce 0.75 Fe 3 CoSb 12 of this study, BaFe 12 O 19 /In 0.25 Co 4 Sb 12 nanocomposite, and Ge/Sn-filling CoSb 3 should be induced by the composition difference, where different fillers might have different influences on the Sb 4 rings and the corresponding vibration modes . To further understand the crystal structure of TGZM-Ce 0.75 Fe 3 CoSb 12 , a typical low-magnification TEM image of TGZM-Ce 0.75 Fe 3 CoSb 12 is displayed in Figure d.…”

Section: Resultsmentioning

confidence: 62%

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Thermoelectric properties of CoSb 3 -based skutterudites are greatly determined by the removal of detrimental impurities, such as (Fe/Co)Sb 2 , (Fe/Co)Sb, and Sb. In this study, we use a facile temperature gradient zone melting (TGZM) method to synthesize high-performance CoSb 3 -based skutterudites by impurity removal. After removing metallic or semimetallic impurities (Fe/Co)Sb, (Fe/Co)Sb 2 , and Sb, the carrier concentration of TGZM-Ce 0.75 Fe 3 CoSb 12 can be reduced to 1.21 × 10 20 cm −3 and the electronic thermal conductivity dramatically reduced to 0.7 W m −1 K −1 at 693 K. Additionally, removing these impurities also effectively reduces the lattice thermal conductivity from 7.2 W m −1 K −1 of cast-Ce 0.75 Fe 3 CoSb 12 to 1.02 W m −1 K −1 of TGZM-Ce 0.75 Fe 3 CoSb 12 at 693 K. As a consequence, TGZM-Ce 0.75 Fe 3 CoSb 12 approaches a high power factor of 11.7 μW cm −1 K −2 and low thermal conductivity of 1.72 W m −1 K −1 at 693 K, leading to a peak zT of 0.48 at 693 K, which is 10 times higher than that of cast-Ce 0.75 Fe 3 CoSb 12 . This study indicates that our facile TGZM method can effectively synthesize high-performance CoSb 3 -based skutterudites by impurity removal and set up a solid foundation for further development.

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Section: Resultsmentioning

confidence: 62%

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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“…[163] Later, they used a CoSb 3 /PVA SA in Tm 3+ /Ho 3+ codoped fiber laser to achieve an ultrashort pulse of 838 fs at 1912.9 nm in 2020. [164] Here, the nonlinear optical absorption response of CoSb 3 /PVA SA is characterized by an open-aperture Z-scan and a two-arm measurement device, respectively, with a nonlinear absorption coefficient of ≈−90.5 × 10 4 cm GW −1 and a high modulation depth of 10%. Following this work, Ma et al first realized a 31-order harmonic mode-locked Tm 3+ -doped fiber laser with a pulse repetition frequency up to 693 MHz based on Sb 2 Se 3 -SA in 2021, which is the highest operating frequency in Sb 2 Se 3 -based fiber laser, and generated 890 fs pulses at 1961.35 nm.…”

Section: Passively Mode-locked Fiber Lasers Around 2 µM Using Real Sasmentioning

confidence: 99%

Advances and Challenges of Ultrafast Fiber Lasers in 2–4 µm Mid‐Infrared Spectral Regions

Zhang,

Wu,

Guang

et al. 2023

Laser & Photonics Reviews

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Mid‐infrared (mid‐IR) ultrafast lasers are widely employed in biomedicine, molecular spectroscopy, material processing, and nonlinear optics. With the improvement of fiber gain media and other fiber optical elements, low‐cost, compact, and high‐efficiency fiber lasers open up new opportunities for 2–4 µm pulse generations, which calls for a comprehensive review of their mode‐locking mechanisms, gain media, and fiber laser system performance. This paper, beginning with an overview of pulse‐generation technologies, reviews recent progress on 2–4 µm mid‐IR ultrafast fiber lasers, including Tm3+‐, Ho3+‐doped, Tm3+/Ho3+ codoped silicate fiber 2 µm lasers, and Er3+‐, Dy3+‐doped, and Ho3+/Pr3+ codoped ZBLAN fiber 2.5–4 µm lasers. Among them, the status of 2–4 µm ultrafast fiber lasers based on 2D material passive mode‐locking is emphatically discussed. Meanwhile, the novel advances on mode‐locking and gain fibers of mid‐IR ultrafast fiber lasers are explored. Furthermore, current and prospective applications of such laser systems are also introduced in detail. This review finally summarizes challenges associated with future development of mid‐IR ultrafast fiber lasers, which provides an outlook on how to achieve more desirable laser performance (e.g., higher average power, higher pulse energy, and longer emission wavelength) that can lead to more practical uses of such lasers.

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Nonlinear absorption property investigation into MAX phase Ti₂AlC at 1.9 μm

Lee

2021

Opt. Mater. Express

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An experimental and theoretical investigation into the nonlinear absorption properties of MAX phase Ti2AlC was conducted at 1900 nm wavelength. First, the nonlinear absorption coefficient measurement of Ti2AlC was carried out using an open-aperture (OA) Z-scan technique. This measurement revealed that the nonlinear absorption coefficient of Ti2AlC was ∼(-24.13×103) cm2/GW at 1900 nm. Subsequently, the energy band structure of the Ti2AlC was calculated through density functional theory (DFT) calculation. This calculation confirmed that Ti2AlC had a metallic band structure implying an ultrawide absorption bandwidth. Finally, the feasibility of fabricating an all-fiberized device of a saturable absorber (SA) using Ti2AlC was conducted with a side-polished fiber platform. The SA was successfully used for the generation of femtosecond soliton pulses with features of 17.91 MHz repetition rate, 4.3-nm bandwidth, and ∼960 fs pulse width at 1922 nm. To the best of authors’ knowledge, this is the first demonstration of the use of a MAX phase-based SA for femtosecond mode-locking in the 1.9 μm spectral region.

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Investigation into nonlinear optical absorption property of CoSb3 skutterudite in the 2 μm spectral region

Cited by 5 publications

References 88 publications

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Advances and Challenges of Ultrafast Fiber Lasers in 2–4 µm Mid‐Infrared Spectral Regions

Nonlinear absorption property investigation into MAX phase Ti₂AlC at 1.9 μm

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Investigation into nonlinear optical absorption property of CoSb3 skutterudite in the 2 μm spectral region

Cited by 5 publications

References 88 publications

Impurity Removal Leading to High-Performance CoSb3-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Impurity Removal Leading to High-Performance CoSb3-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Advances and Challenges of Ultrafast Fiber Lasers in 2–4 µm Mid‐Infrared Spectral Regions

Nonlinear absorption property investigation into MAX phase Ti2AlC at 1.9 μm

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Product

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Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Nonlinear absorption property investigation into MAX phase Ti₂AlC at 1.9 μm