Durable 3–5 μm transmitting infrared window materials

Harris, Daniel C.

doi:10.1016/s1350-4495(98)00006-1

Cited by 249 publications

(149 citation statements)

References 50 publications

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“…Since TPA plays an important role in nonlinear applications [109,110], the color transition from red to green in Figure 1 is between the bandgap wavelength and the half-bandgap wavelength (two blue lines), where TPA decreases with wavelength. For silicon, almost two-octave bandwidth from 2.2 to 8.5 µm [146] is available for nonlinear applications without TPA, covering a large fraction of mid-IR range. It is important to note that amorphous silicon has a bandgap energy of 1.7 eV [32,33] and thus has TPA diminishing at a much shorter wavelength ( < 1.55 μm) than crystalline silicon.…”

Section: Methodsmentioning

confidence: 99%

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

et al. 2014

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Group IV photonics hold great potential for nonlinear applications in the near-and mid-infrared (IR) wavelength ranges, exhibiting strong nonlinearities in bulk materials, high index contrast, CMOS compatibility, and cost-effectiveness. In this paper, we review our recent numerical work on various types of silicon and germanium waveguides for octave-spanning ultrafast nonlinear applications. We discuss the material properties of silicon, silicon nitride, silicon nano-crystals, silica, germanium, and chalcogenide glasses including arsenic sulfide and arsenic selenide to use them for waveguide core, cladding and slot layer. The waveguides are analyzed and improved for four spectrum ranges from visible, near-IR to mid-IR, with material dispersion given by Sellmeier equations and wavelength-dependent nonlinear Kerr index taken into account. Broadband dispersion engineering is emphasized as a critical approach to achieving on-chip octavespanning nonlinear functions. These include octave-wide supercontinuum generation, ultrashort pulse compression to sub-cycle level, and mode-locked Kerr frequency comb generation based on few-cycle cavity solitons, which are potentially useful for next-generation optical communications, signal processing, imaging and sensing applications.

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Section: Methodsmentioning

confidence: 99%

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

et al. 2014

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“…Vandens temperatūros profilių matavimo re zultatai pateikti 4 Iki x = 0 vanduo su garu neturi tiesioginio kontakto. Nuo x = 0 kondensuojantis garui į van dens paviršių perduodama fazinio virsmo šiluma ir soties temperatūros kondensato masė.…”

Section: Tyrimų Rezultatai Ir Jų Analizėunclassified

“…Nuo x = 0 kondensuojantis garui į van dens paviršių perduodama fazinio virsmo šiluma ir soties temperatūros kondensato masė. Į kanalą tiekiamas garas yra truputį perkaitintas (tempe ratūra ~120 °C) ir labai mažai kondensuojasi ant sienelių, tačiau kondensacijai ant vandens pavir šiaus šis perkaitinimas įtakos beveik neturi [4]. Ženklios įtakos pradinei kondensacijai neturi ir pradinio fazių temperatūrų skirtumo dydis, nes, vos pradėjęs sąveikauti su garu, laminariškai te kančio vandens paviršius iškart pasiekia sotinimo temperatūrą.…”

Section: Tyrimų Rezultatai Ir Jų Analizėunclassified

Kondensacijos šilumos nuvedimo nuo tarpfazinio paviršiaus į vandens gilumą tyrimas taikant termografinį metodą

Laurinavicius¹,

Šeporaitis²,

Gasiūnas³

2015

energetika

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“…9)11) In addition, the mechanical and optical properties of ZnS wavetransparent ceramic were also extensively studied. 12) 17) With the increase of speed, the severe service environment of near space vehicle gives a harsh demand for the thermal shock resistance (TSR) of ZnS antenna window under the mechanical/ heat coupling conditions. But the TSR of ceramic is really poor due to its inherent brittleness.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, improving the TSR of ceramic has been one of the most important focal points in the ceramic field. 18)22) The second TSR parameter RB was used by Harris to study the TSR of ZnS wave-transparent ceramic, 17) but the application environment and applicable conditions of RB were neglected. 23) In order to study the typical situation (when used as antenna window of near space vehicle, ZnS wave-transparent ceramic is subjected to aerodynamic heating, pneumatic pressure and external constraint in its service process), the external constraint and pneumatic pressure are considered and the heat transfer condition and critical rupture temperature difference 23), 24) are used to characterize the TSR of ZnS plate in this paper.…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of ZnS wave-transparent ceramic considering the effects of constraint and pneumatic pressure

Cheng

et al. 2014

J. Ceram. Soc. Japan

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In order to study the combined effect of aerodynamic heating, pneumatic pressure and external constraint on the thermal shock resistance (TSR) of ZnS wave-transparent ceramic in its actual service process, the theoretical model is established by introducing the analytical solution of transient heat conduction problem of ZnS plate under aerodynamic heating into its thermal stress field model. The numerical simulation is also conducted not only to examine the theoretical model, but also to study how to improve the TSR. The influences of constraint and pneumatic pressure are studied and the effects of loosing constraint and active cooling are focused on. The study shows that the critical rupture temperature difference of simply supported ZnS plate will form wave peak; the TSR of ZnS plate is obviously optimized when loosing constraint method has been adopted, and the effect of pneumatic pressure on TSR is closely related to the change of failure region; active cooling is an effective way to improve the TSR of ZnS plate and the stronger pneumatic pressure, the better TSR, but active cooling can't be too violent.

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Durable 3–5 μm transmitting infrared window materials

Cited by 249 publications

References 50 publications

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

Kondensacijos šilumos nuvedimo nuo tarpfazinio paviršiaus į vandens gilumą tyrimas taikant termografinį metodą

Thermal shock resistance of ZnS wave-transparent ceramic considering the effects of constraint and pneumatic pressure

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