Mid-infrared nonlinear absorption in As_2S_3 chalcogenide glass

Théberge, F.; Mathieu, Pierre; Thiré, Nicolas; Daigle, J.-F.; Schmidt, Bruno E.; Fortin, Jean; Vallée, Réal; Messaddeq, Younès; Légaré, François

doi:10.1364/oe.24.024600

Cited by 22 publications

(3 citation statements)

References 40 publications

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“…4(b) illustrate the presence of a valley in the center of each trace, which can be attributed to reverse-saturated absorption. Given that the normalized photon energy (hv/E g , where hv = 1.55 eV is the incident photon energy at 800 nm) of the samples between 0.6 and 0.7 were within the two-photon absorption region (TPA; 0.5 < hv/E g < 1) [30], we can ascribe the nonlinear absorption behavior of the GIC parent glass and ChGCs at 800 nm to the TPA process. The corresponding M A N U S C R I P T…”

Section: -1385) Crystallites According To the Reference Given At Thmentioning

confidence: 99%

Performance modification of third-order optical nonlinearity of chalcogenide glasses by nanocrystallization

Yang

Sun

Lin

et al. 2019

Ceramics International

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et al.. Performance modification of third-order optical nonlinearity of chalcogenide glasses by nanocrystallization. Ceramics International, Elsevier, 2019, 45 (15), pp. Abstract:We demonstrate the modification of the third-order optical nonlinearity (TONL) of chalcogenide glasses (within the GeS 2 -In 2 S 3 -CsCl ternary system) by nanocrystallization, i.e., by controlling the precipitation of nanocrystals (in pure In 2 S 3 phase) within the amorphous background. Compared with the parent glass, the resultant chalcogenide glass ceramics (ChGCs) have unchanged infrared transmittance but modifiable optical bandgap energy with treatment duration. Both nonlinear refraction coefficient and nonlinear absorption coefficient of the ChGCs are increased due to the appearance of In 2 S 3 nanocrystals. ChGCs subjected to heat treatment for 1.3-2 h are found to exhibit the optimum TONL performance.

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Section: -1385) Crystallites According To the Reference Given At Thmentioning

confidence: 99%

Performance modification of third-order optical nonlinearity of chalcogenide glasses by nanocrystallization

Yang

Sun

Lin

et al. 2019

Ceramics International

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“…These unique properties, coupled with the flexible size and modifiable composition, make ChG an ideal material for infrared optics and nonlinear photonic devices. [4,5] Therefore, great efforts [2,[6][7][8][9] have been made to design ChGs that match the specifications of each particular TONL-based optical device. To evaluate the performances of ChGs for nonlinear photonic applications such as all-optical switching, wavelength conversion for an optical communication system, a key prerequisite is to design bulk glass composition regarding the figure of merit (FOM) [6,10] that considers the trade-off among nonlinear refractive, nonlinear absorption, and incident wavelength.…”

Section: Introductionmentioning

confidence: 99%

Research progress of third-order optical nonlinearity of chalcogenide glasses

et al. 2018

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Chalcogenide glasses (ChGs) are a promising candidate for applications in nonlinear photonic devices. In this paper, we review the research progress of the third-order optical nonlinearity (TONL) of ChGs from the following three aspects: chemical composition, excitation condition, and post processing. The deficiencies in previous studies and further research of the TONL property of ChGs are also discussed.

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“…The situation is improved at mid-IR wavelengths as even two photons have insufficient energy to bridge the gap, suggesting greater opportunities for power scalability. A recent study, however, identified the possibility of strong nonlinear absorption in As 2 S 3 from two-photon absorption of valence electrons to the mid-gap Urbach extension, followed by linear absorption of excited states [25]. This is not likely to be a limiting factor for the short lengths required for nonlinear compression, although further work is needed to confirm this and to explore this loss mechanism.…”

mentioning

confidence: 98%

Generation of 70-fs pulses at 286 μm from a mid-infrared fiber laser

et al. 2017

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We propose and demonstrate a simple route to fewoptical-cycle pulse generation from a mid-infrared fiber laser through nonlinear compression of pulses from a holmium-doped fiber oscillator using a short length of chalcogenide fiber and a grating pair. Pulses from the oscillator with 265 fs duration at 2.86 µm are spectrally broadened through self-phase modulation in step-index As 2 S 3 fiber to 140 nm bandwidth, and then re-compressed to 70 fs (7.3 optical cycles). These are the shortest pulses from a mid-infrared fiber system to date, and we note that our system is compact, robust and uses only commercially available components. The scalability of this approach is also discussed, supported by numerical modeling. The generation of laser pulses comprising only a few cycles of the electric and magnetic fields creates substantial scientific and technological opportunities. For example, such ultrashort pulses are enabling new time-resolved studies of atomic and molecular processes on unprecedented timescales and driving the development of tabletop extreme UV and attosecond pulse sources through high-harmonic generation (HHG) [1]. After significant progress in the near-infrared region, there is currently strong demand to push the wavelength of few-optical-cycle pulse sources to beyond 2 µm, into the mid-infrared (mid-IR): these wavelengths correspond to strong absorption resonances in many important organic materials, enabling further investigations and processing of new materials, and also offering advantages for HHG where the highest possible generated photon energy scales with the driving laser wavelength [1].At present, a widely used approach to mid-IR few-cycle pulse generation is parametric wavelength conversion (e.g. optical parametric chirp pulse amplification) of ultrafast near-IR sources, often including a subsequent compression stage [2][3][4][5][6]. This route has yielded mid-IR few-cycle lasers with remarkable performance, but their significant complexity and cost limit widespread practical applications. An alternative simpler approach is the direct development of mid-IR ultrafast oscillators. Bulk transition-metal doped II-VI semiconductors such as chromium-and iron-doped sulfide and selenide offer direct access to the 2-6 µm region, but while 46 fs pulses have been reported from mode-locked Cr:ZnS systems, such pulse generation has only been demonstrated thus far up to ∼2.4 µm [7].One highly promising route is the recent emergence of ultrafast rare-earth-doped fluoride fiber lasers, which bring the benefits of fiber laser technology (compact setups, simple thermal management, high beam quality etc.) to the mid-IR region. Mode-locked holmium-and erbium-based fiber lasers have been demonstrated at 2.7-2.9 µm wavelengths [8-12] (including subsequent extension to 3.6 µm using Raman soliton self-frequency shift [13]), producing tens of nanojoule energy pulses as short as 160 fs. Due to the limited gain bandwidths of holmium and erbium ions (which set the minimum mode-locked pulse width via the transform lim...

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Mid-infrared nonlinear absorption in As_2S_3 chalcogenide glass

Cited by 22 publications

References 40 publications

Performance modification of third-order optical nonlinearity of chalcogenide glasses by nanocrystallization

Performance modification of third-order optical nonlinearity of chalcogenide glasses by nanocrystallization

Research progress of third-order optical nonlinearity of chalcogenide glasses

Generation of 70-fs pulses at 286 μm from a mid-infrared fiber laser

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